US5488938A
Expired / Lapsed
US
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Fault detecting apparatus for exhaust gas recirculation control system of internal combustion engine
Assignee: Mitsubishi Electric Corp
•
Filing: 1995-03-02
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Granted: 1996-02-06
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Expires: 2015-03-02
Abstract
Abstract A fault detecting apparatus for an exhaust gas recirculation control system of an internal combustion engine includes a throttle valve provided in an intake pipe of the engine, an exhaust gas recirculation pipe for introducing an exhaust gas of the engine to the intake pipe downstream of the throttle valve, an exhaust gas recirculation valve for regulating a recirculation flow rate of the exhaust gas, sensors for detecting operation state inclusive of an intake pressure, an exhaust gas recirculation valve control unit for controlling the exhaust gas recirculation valve in accordance with operation state information, a fault decision enabling condition detecting means for detecting satisfaction of the condition enabling the decision about occurrence of fault in the recirculation valve control unit on the basis of the operation state information, a unit for forcibly opening and/or closing the exhaust gas recirculation valve when the fault decision enabling condition is satisfied, a fault decision means for comparing a value derived from the intake pressures detected upon enforcive opening/closing of the exhaust gas recirculation control valve with a fault decision reference value to decide whether any fault occurs in the recirculation valve control unit, and a compensation means for compensating for influence of a parameter which affects the intake pressures detected upon enforcive opening/closing of the recirculation valve. The range within which the fault decision is enabled can be widened and/or reliability of the fault decision can be improved.
Inventors
- 👤 Hirofumi Ohuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:19
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0055; F02M; F02M26/00; F02M26/49; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0406; F02M26/52; F02M26/55; F02M26/56; F02M26/57; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 73
Claim 1
Independent Claim
319 words
A fault detecting apparatus for an exhaust gas recirculation control system of an internal combustion engine, comprising: an intake pipe for supplying air to said internal combustion engine; a throttle valve disposed in said intake pipe to be selectively opened and closed for regulating a flow of the air supplied to said internal combustion engine through said intake pipe; an exhaust gas recirculation pipe for introducing an exhaust gas of said internal combustion engine to said intake pipe at a location downstream of said throttle valve for recirculating the exhaust gas through said internal combustion engine; an exhaust gas recirculation valve disposed in said exhaust gas recirculation pipe for regulating a recirculation flow rate of the exhaust gas flowing through said exhaust gas recirculation pipe; sensor means for detecting operation state of said internal combustion engine, inclusive of an intake pressure, to thereby output engine operation state information; exhaust gas recirculation valve control means for controlling said exhaust gas recirculation valve in dependence on said operation state information supplied from said sensor means; fault decision enabling condition detecting means for detecting satisfaction of a decision enabling condition for enabling a decision concerning occurrence of a fault in an exhaust gas recirculation control means inclusive of said exhaust gas recirculation valve control means on the basis of said operation state information; enforcive valve opening/closing means for forcibly opening and/or closing said exhaust gas recirculation valve during a period in which said fault decision enabling condition is satisfied; and fault decision means for comparing a value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value to thereby decide whether any fault occurs in said exhaust gas recirculation control means; wherein said fault decision means includes compensation means for suppressing influence of a parameter which affects said intake pressures detected upon said enforcive opening/closing of said exhaust gas recirculation valve.
Claim 2
Dependent Claim
319 words
A fault detecting apparatus for an exhaust gas recirculation control system of an internal combustion engine, comprising: an intake pipe for supplying air to said internal combustion engine; a throttle valve disposed in said intake pipe to be selectively opened and closed for regulating a flow of the air supplied to said internal combustion engine through said intake pipe; an exhaust gas recirculation pipe for introducing an exhaust gas of said internal combustion engine to said intake pipe at a location downstream of said throttle valve for recirculating the exhaust gas through said internal combustion engine; an exhaust gas recirculation valve disposed in said exhaust gas recirculation pipe for regulating a recirculation flow rate of the exhaust gas flowing through said exhaust gas recirculation pipe; sensor means for detecting operation state of said internal combustion engine, inclusive of an intake pressure, to thereby output engine operation state information; exhaust gas recirculation valve control means for controlling said exhaust gas recirculation valve in dependence on said operation state information supplied from said sensor means; fault decision enabling condition detecting means for detecting satisfaction of a decision enabling condition for enabling a decision concerning occurrence of a fault in an exhaust gas recirculation control means inclusive of said exhaust gas recirculation valve control means on the basis of said operation state information; enforcive valve opening/closing means for forcibly opening and/or closing said exhaust gas recirculation valve during a period in which said fault decision enabling condition is satisfied; and fault decision means for comparing a value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value to thereby decide whether any fault occurs in said exhaust gas recirculation control means; wherein said fault decision means includes compensation means for suppressing influence of a parameter which affects said intake pressures detected upon said enforcive opening/closing of said exhaust gas recirculation valve.
Claim 3
Dependent Claim
151 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, wherein said operation state information contains at least information concerning a rotation number of said internal combustion engine and information indicating that said throttle valve is in a fully-closed state; wherein said fault decision enabling condition detecting means detects as said fault decision enabling condition a deceleration state of said internal combustion engine on the basis of at least said information of the engine rotation number and said information indicating the fully-closed state of said throttle valve; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of the engine rotation number detected substantially concurrently with detection of said intake pressure.
Claim 4
Dependent Claim
68 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means includes bypass air flow rate change inhibit means for inhibiting change of said bypass air flow rate during a period in which said fault decision enabling condition is satisfied.
Claim 5
Dependent Claim
98 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and the value derived from the intake pressures detected upon said enforcive opening/closing of said exhaust gas recirculation valve by making use of the information of said bypass air flow rate detected substantially concurrently with detection of said intake pressure.
Claim 6
Dependent Claim
96 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means includes bypass air flow rate change termination decision means for deciding whether or not change of said bypass air flow rate is terminated; and wherein said enforcive valve opening/closing means and said fault decision means are validated when said fault decision enabling condition is satisfied and when no change takes place in said bypass air flow rate.
Claim 7
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 8
Dependent Claim
92 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of the engine load detected substantially concurrently with detection of said intake pressure.
Claim 9
Dependent Claim
79 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, further comprising: an engine load installed in association with said internal combustion engine to be driven thereby; and engine load driving means for driving said engine load in response to a power-on command for said engine load; wherein said compensation means includes engine load inhibit means for inhibiting said engine load from being driven so long as said fault decision enabling condition is satisfied.
Claim 10
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 11
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 12
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 2, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 13
Dependent Claim
134 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, wherein said operation state information contains at least information concerning an engine rotation number and a throttle opening degree of said throttle valve; wherein said fault decision enabling condition detecting means detects as said fault decision enabling condition a stable state of said internal combustion engine on the basis of at least said engine rotation number; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and the value derived from the intake pressures detected upon said enforcive opening/closing of said exhaust gas recirculation valve by making use of the information of said throttle opening degree detected substantially concurrently with detection of said intake pressure.
Claim 14
Dependent Claim
68 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution (quantization) of said analogue-to-digital converter.
Claim 15
Dependent Claim
68 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means includes bypass air flow rate change inhibit means for inhibiting change of said bypass air flow rate during a period in which said fault decision enabling condition is satisfied.
Claim 16
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 14, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 17
Dependent Claim
98 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and the value derived from the intake pressures detected upon said enforcive opening/closing of said exhaust gas recirculation valve by making use of the information of said bypass air flow rate detected substantially concurrently with detection of said intake pressure.
Claim 18
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 16, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 19
Dependent Claim
96 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means includes bypass air flow rate change termination decision means for deciding whether or not change of said bypass air flow rate is terminated; and wherein said enforcive valve opening/closing means and said fault decision means are validated when said fault decision enabling condition is satisfied and when no change takes place in said bypass air flow rate.
Claim 20
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 18, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 21
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 22
Dependent Claim
92 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of the engine load detected substantially concurrently with detection of said intake pressure.
Claim 23
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 21, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 24
Dependent Claim
79 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, further comprising: an engine load installed in association with said internal combustion engine to be driven thereby; and engine load driving means for driving said engine load in response to a power-on command for said engine load; wherein said compensation means includes engine load inhibit means for inhibiting said engine load from being driven so long as said fault decision enabling condition is satisfied.
Claim 25
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 23, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 26
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 27
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 25, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 28
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 29
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 27, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 30
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 12, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 31
Dependent Claim
67 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 29, wherein said compensation means includes an analogue-to-digital converter for converting the information of said throttle opening degree into a digital signal; and wherein at least one of said fault decision reference value and the value derived from said intake pressure is corrected in dependence on a minimum resolution of said analogue-to-digital converter.
Claim 32
Dependent Claim
68 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means includes bypass air flow rate change inhibit means for inhibiting change of said bypass air flow rate during a period in which said fault decision enabling condition is satisfied.
Claim 33
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 31, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 34
Dependent Claim
89 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 31, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve with the engine load detected substantially concurrently with detection of said intake pressure.
Claim 35
Dependent Claim
79 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 31, further comprising: an engine load installed in association with said internal combustion engine to be driven thereby; and engine load driving means for driving said engine load in response to a power-on command for said engine load; wherein said compensation means includes engine load inhibit means for inhibiting said engine load from being driven so long as said fault decision enabling condition is satisfied.
Claim 36
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 31, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 37
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 31, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 38
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 31, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 39
Dependent Claim
98 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and the value derived from the intake pressures detected upon said enforcive opening/closing of said exhaust gas recirculation valve by making use of the information of said bypass air flow rate detected substantially concurrently with detection of said intake pressure.
Claim 40
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 38, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 41
Dependent Claim
89 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 38, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve with the engine load detected substantially concurrently with detection of said intake pressure.
Claim 42
Dependent Claim
79 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 38, further comprising: an engine load installed in association with said internal combustion engine to be driven thereby; and engine load driving means for driving said engine load in response to a power-on command for said engine load; wherein said compensation means includes engine load inhibit means for inhibiting said engine load from being driven so long as said fault decision enabling condition is satisfied.
Claim 43
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 38, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 44
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 38, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 45
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 38, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 46
Dependent Claim
96 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, further comprising: bypass air flow rate control means for controlling rate of intake air flow which bypasses said throttle valve; wherein said compensation means includes bypass air flow rate change termination decision means for deciding whether or not change of said bypass air flow rate is terminated; and wherein said enforcive valve opening/closing means and said fault decision means are validated when said fault decision enabling condition is satisfied and when no change takes place in said bypass air flow rate.
Claim 47
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 45, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 48
Dependent Claim
89 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 45, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve with the engine load detected substantially concurrently with detection of said intake pressure.
Claim 49
Dependent Claim
77 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 45, an engine load installed in association with said internal combustion engine to be driven thereby; and engine load driving means for driving said engine load in response to a power-on command for said engine load; wherein said compensation means includes engine load inhibit means for inhibiting said engine load from being driven so long as said fault decision enabling condition is satisfied.
Claim 50
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 45, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 51
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 45, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 52
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 45, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 53
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 54
Dependent Claim
89 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve with the engine load detected substantially concurrently with detection of said intake pressure.
Claim 55
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 53, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 56
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 53, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 57
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 53, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 58
Dependent Claim
79 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, further comprising: an engine load installed in association with said internal combustion engine to be driven thereby; and engine load driving means for driving said engine load in response to a power-on command for said engine load; wherein said compensation means includes engine load inhibit means for inhibiting said engine load from being driven so long as said fault decision enabling condition is satisfied.
Claim 59
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 57, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 60
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 57, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 61
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 57, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 62
Dependent Claim
122 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, wherein said operation state information contains at least information concerning atmospheric pressure; wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means by comparing the value derived from the intake pressure detected upon enforcive opening/closing of said exhaust gas recirculation valve with a fault decision reference value; and wherein said compensation means corrects at least one of said fault decision reference value referenced by said fault decision means upon said comparison and said value derived from the intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve by making use of said atmospheric pressure information.
Claim 63
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 61, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 64
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 61, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 65
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 63, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 66
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 61, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 67
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 65, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 68
Dependent Claim
95 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, wherein said compensation means includes exhaust gas recirculation ratio equivalent value calculating means for calculating a value equivalent to an exhaust gas recirculation ratio corresponding to the exhaust gas recirculation flow rate on the basis of intake pressures detected upon enforcive opening/closing of said exhaust gas recirculation valve; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of said exhaust gas recirculation ratio equivalent value.
Claim 69
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 67, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 70
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 67, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 71
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 69, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
Claim 72
Dependent Claim
104 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 1, wherein said compensation means includes: intake pressure detection timing calculating means for calculating a timing for detecting the intake pressures upon enforcive opening/closing of said exhaust gas recirculation valve; and filter processing means for filtering information signal of said intake pressures as detected upon enforcive opening/closing of said exhaust gas recirculation valve in conformance with said timing; and wherein said fault decision means makes decision as to occurrence of a fault in said exhaust gas recirculation control means on the basis of the intake pressure undergone said filter processing.
Claim 73
Dependent Claim
72 words
A fault detecting apparatus for an exhaust gas recirculation control system according to claim 71, wherein said engine operation state information contains at least information concerning an engine load of said internal combustion engine; wherein said compensation means includes engine load change detecting means for detecting a change of said engine load; and wherein upon detection of a change in said engine load, said fault decision enabling condition is invalidated from satisfaction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |