Patent US6155240A successfully refreshed from Google Patents.
US6155240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuator control apparatus for internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1999-03-16
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Granted: 2000-12-05
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Expires: 2019-03-16
Abstract
Abstract A lower limit EIEOF of a current for controlling the EGR valve employed to prevent the EGR valve from generating chattering is set in accordance with an engine revolution speed NE which indirectly indicates an amount of exhaust pressure acting on the EGR valve as the current value of the lower limit EIEOF is influenced by the exhaust pressure as a back pressure of the EGR valve. Therefore, it is possible to set a current value eiefin for EGR control in a range which has not been conventionally covered. The EGR control can be applied to a wider driving region, thus achieving an improved driving state of a diesel engine.
Inventors
- 👤 Naoki Amano
- 👤 Hideyuki Takaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:07
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M26/57; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
116 words
An actuator control apparatus for an internal combustion engine, comprising: an actuator operated by a balance of a control pressure and a back pressure that varies with a driving state of the internal combustion engine; a control pressure supply valve for supplying the control pressure to the actuator in accordance with a command signal; and limit value setting means for setting a limit value of the command signal in accordance with a driving state of the internal combustion engine, wherein, as one of the back pressure and an engine revolution speed is reduced, the limit value setting means sets the limit value of the command signal so that an opening degree of the actuator is decreased.
Claim 2
Dependent Claim
116 words
An actuator control apparatus for an internal combustion engine, comprising: an actuator operated by a balance of a control pressure and a back pressure that varies with a driving state of the internal combustion engine; a control pressure supply valve for supplying the control pressure to the actuator in accordance with a command signal; and limit value setting means for setting a limit value of the command signal in accordance with a driving state of the internal combustion engine, wherein, as one of the back pressure and an engine revolution speed is reduced, the limit value setting means sets the limit value of the command signal so that an opening degree of the actuator is decreased.
Claim 3
Dependent Claim
33 words
An actuator control apparatus for an internal combustion engine according to claim 1, wherein the limit value setting means sets a limit value of the command signal in accordance with the back pressure.
Claim 4
Dependent Claim
38 words
An actuator control apparatus for an internal combustion engine according to claim 1, wherein the limit value setting means sets a limit value of the command signal in accordance with a revolution speed of the internal combustion engine.
Claim 5
Dependent Claim
89 words
An actuator control apparatus for an internal combustion engine according to claim 1, wherein the actuator is formed as an EGR valve for controlling an opening degree of an exhaust gas recirculation passage, the control pressure supply valve is formed as an electric pressure regulating valve for controlling a pressure to be supplied to the EGR valve, and the command signal having a limit value is formed as a current for driving the electric pressure regulating valve and the limit value is a lower limit of the driving current.
Claim 6
Dependent Claim
53 words
An actuator control apparatus for an internal combustion engine according to claim 4, wherein the limit value setting means uses a revolution speed of the internal combustion engine as a driving state thereof, and sets a current value of the lower limit in accordance with the revolution speed of the internal combustion engine.
Claim 7
Dependent Claim
67 words
An actuator control apparatus for an internal combustion engine according to claim 5, further comprising: a revolution sensor for detecting a revolution speed of the internal combustion engine to be output as a signal indicating a driving state of the internal combustion engine; wherein the limit value setting means sets the current value of the lower limit in accordance with a signal output from the revolution sensor.
Claim 8
Dependent Claim
33 words
An actuator control apparatus for an internal combustion engine according to claim 4, wherein the limit value setting means sets a current value of the lower limit in accordance with the back pressure.
Claim 9
Dependent Claim
70 words
An actuator control apparatus for an internal combustion engine according to claim 7, further comprising: an exhaust pressure sensor for detecting an exhaust pressure of the internal combustion engine to be output as a signal indicating a driving state of the internal combustion engine; and wherein the limit value setting means sets the current value of the lower limit in accordance with the signal output from the exhaust pressure sensor.
Claim 10
Dependent Claim
65 words
An actuator control apparatus for an internal combustion engine according to claim 4, further comprising: an intake pressure sensor for detecting an intake pressure of the internal combustion engine to be output as a signal indicating a driving state thereof; wherein the limit value setting means sets the current value of the lower limit in accordance with a signal output from the intake pressure sensor.
Claim 11
Dependent Claim
65 words
An actuator control apparatus for an internal combustion engine according to claim 4, further comprising: air-flow meter for detecting an amount of intake air supplied to the engine, the air-flow meter outputting a signal indicating a driving state of the engine; wherein the limit value setting means sets the current value of the lower limit in accordance with the signal output from the air-flow meter.
Claim 12
Dependent Claim
75 words
An actuator control apparatus for an internal combustion engine according to claim 4, further comprising: fuel injection detecting means for detecting an amount of fuel injected to the engine and for outputting a signal corresponding to the fuel injection amount as a value indicating a driving state of the engine; wherein the limit setting means sets the current value of the lower limit in accordance with the signal output from the fuel injection detecting means.
Claim 13
Dependent Claim
74 words
An actuator control apparatus for an internal combustion engine according to claim 4, wherein the control pressure supply valve is formed as an electric vacuum pressure regulating valve for controlling a vacuum pressure from to be supplied to the EGR valve, and the command signal having a limit value is formed as a current for driving the electric vacuum pressure regulating valve and the limit value is a lower limit of the current value.
Claim 14
Dependent Claim
123 words
An actuator control apparatus for an internal combustion engine, comprising: an actuator for generating a drive force in such a manner that the drive force acts against a back pressure that varies with a driving state of the internal combustion engine; actuator control means for supplying the actuator with a command signal for controlling an amount of the drive force generated; and limit value setting means for setting a limit value of the command signal in accordance with a driving state of the internal combustion engine, wherein, as one of the back pressure and an engine revolution speed is reduced, the limit value setting means sets the limit value of the command signal so that an opening degree of the actuator is decreased.
Claim 15
Dependent Claim
123 words
An actuator control apparatus for an internal combustion engine, comprising: an actuator for generating a drive force in such a manner that the drive force acts against a back pressure that varies with a driving state of the internal combustion engine; actuator control means for supplying the actuator with a command signal for controlling an amount of the drive force generated; and limit value setting means for setting a limit value of the command signal in accordance with a driving state of the internal combustion engine, wherein, as one of the back pressure and an engine revolution speed is reduced, the limit value setting means sets the limit value of the command signal so that an opening degree of the actuator is decreased.
Claim 16
Dependent Claim
28 words
An actuator control apparatus for an internal combustion engine according to claim 13, wherein the actuator has a linear solenoid as a source for generating the drive power.
Claim 17
Dependent Claim
28 words
An actuator control apparatus for an internal combustion engine according to claim 14, wherein the actuator has a step motor as a source for generating the drive power.
References Cited (Backward Citations)
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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) | 2003-12-05 | 2004-06-05 | 2004-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-05 | 2008-06-05 | 2008-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-05 | 2012-06-05 | 2012-12-05 | $7700.00 | Window Closed / Lapsed |