US5845486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine exhaust gas purifier apparatus
Assignee: Denso Corp
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Filing: 1996-08-08
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Granted: 1998-12-08
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Expires: 2016-08-08
Abstract
Abstract In order to activate an exhaust catalyst of an engine as quickly as possible from the engine restart, an exhaust damper for opening and closing an exhaust pipe is disposed downstream of a catalyst. A pneumatic actuator drives to open and close the exhaust damper. A negative pressure is introduced into a pressure chamber of the pneumatic actuator to close the exhaust damper after the engine is stopped. The closed exhaust damper keeps the warmth of the catalyst to ensure high exhaust gas purification performed when the engine is restarted. Alternatively, activation of the exhaust catalyst is enhanced by retarding the engine ignition timing and raising the engine idling speed.
Inventors
- 👤 Yukihiro Yamashita
- 👤 Toshiki Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:41
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/021; F02D41/0235; F02D41/024; F02D41/0255; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N9/00; F02D35/00; F02D35/0015; F02D35/0023; F02D41/04; F02D41/042; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1506; F01N2260/00; F01N2260/14; F01N2900/00; F01N2900/04; F01N2900/0422; F02D2200/00; F02D2200/02; F02D2200/08; F02D2200/0802; F02D9/00; F02D9/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
84 words
An internal combustion engine exhaust gas purifying apparatus comprising: exhaust closing means provided in an exhaust passage of an internal combustion engine having a catalyst for purifying exhaust gas, for opening and closing the exhaust passage; catalyst state detecting means for detecting a state of the catalyst; and drive means for closing the exhaust passage by using the exhaust closing means after the internal combustion engine has stopped, on the basis of the state of the catalyst detected by the catalyst state detecting means.
Claim 2
Dependent Claim
84 words
An internal combustion engine exhaust gas purifying apparatus comprising: exhaust closing means provided in an exhaust passage of an internal combustion engine having a catalyst for purifying exhaust gas, for opening and closing the exhaust passage; catalyst state detecting means for detecting a state of the catalyst; and drive means for closing the exhaust passage by using the exhaust closing means after the internal combustion engine has stopped, on the basis of the state of the catalyst detected by the catalyst state detecting means.
Claim 3
Dependent Claim
44 words
An internal combustion engine exhaust gas purifying apparatus according to claim 1, wherein: the catalyst state detecting means determines whether the catalyst is activated; and the drive means closes the exhaust passage if the catalyst state detecting means determines that the catalyst is activated.
Claim 4
Dependent Claim
39 words
An internal combustion engine exhaust gas purifying apparatus according to claim 1, wherein: the drive means includes means for opening the exhaust passage if operation for restarting the internal combustion engine is performed while the exhaust passage is closed.
Claim 5
Dependent Claim
52 words
An internal combustion engine exhaust gas purifying apparatus according to claim 1, wherein: the drive means includes means for, if the exhaust passage is closed after the internal combustion engine has stopped, opening the exhaust passage when at least a predetermined length of time elapses after the internal combustion engine has stopped.
Claim 6
Dependent Claim
90 words
An internal combustion engine exhaust gas purifying apparatus according to claim 1, wherein: the drive means includes pressure means for producing a drive force in a closing direction by using an operating pressure from a pressure source and for producing a drive force in an opening direction by using a spring force, the pressure means gradually attenuating the operating pressure while the exhaust passage is closed, and the pressure means allowing the spring force to open the exhaust closing means when the operating pressure becomes less than the spring force.
Claim 7
Dependent Claim
112 words
An internal combustion engine exhaust gas purifying apparatus comprising: catalyst early warm-up means for, after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; catalyst temperature detecting means for detecting temperature of the catalyst; and catalyst early warm-up deciding means for deciding whether to perform the catalyst early warm-up control by the catalyst early warm-up means on the basis of the temperature of the catalyst; wherein the catalyst early warm-up means calculates a parameter of the catalyst early warm-up control in accordance with the catalyst temperature detected by the catalyst temperature detecting means.
Claim 8
Dependent Claim
112 words
An internal combustion engine exhaust gas purifying apparatus comprising: catalyst early warm-up means for, after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; catalyst temperature detecting means for detecting temperature of the catalyst; and catalyst early warm-up deciding means for deciding whether to perform the catalyst early warm-up control by the catalyst early warm-up means on the basis of the temperature of the catalyst; wherein the catalyst early warm-up means calculates a parameter of the catalyst early warm-up control in accordance with the catalyst temperature detected by the catalyst temperature detecting means.
Claim 9
Dependent Claim
114 words
An internal combustion engine exhaust gas purifying apparatus comprising: catalyst early warm-up means for, after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; catalyst temperature detecting means for detecting temperature of the catalyst; and catalyst early warm-up deciding means for deciding whether to perform the catalyst early warm-up control by the catalyst early warm-up means on the basis of the temperature of the catalyst; wherein the catalyst temperature detecting means estimates a catalyst temperature on the basis of coolant temperature of the internal combustion engine and duration of stoppage of the internal combustion engine.
Claim 10
Dependent Claim
114 words
An internal combustion engine exhaust gas purifying apparatus comprising: catalyst early warm-up means for, after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; catalyst temperature detecting means for detecting temperature of the catalyst; and catalyst early warm-up deciding means for deciding whether to perform the catalyst early warm-up control by the catalyst early warm-up means on the basis of the temperature of the catalyst; wherein the catalyst temperature detecting means estimates a catalyst temperature on the basis of coolant temperature of the internal combustion engine and duration of stoppage of the internal combustion engine.
Claim 11
Dependent Claim
126 words
An internal combustion engine exhaust gas purifying apparatus comprising: catalyst early warm-up means for, after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; catalyst temperature detecting means for detecting temperature of the catalyst; and catalyst early warm-up deciding means for deciding whether to perform the catalyst early warm-up control by the catalyst early warm-up means on the basis of the temperature of the catalyst; wherein the catalyst temperature detecting means estimates a catalyst temperature on the basis of at least one of element temperature and heater temperature of an air-fuel ratio sensor disposed on at least one of upstream side and downstream side of the catalyst.
Claim 12
Dependent Claim
126 words
An internal combustion engine exhaust gas purifying apparatus comprising: catalyst early warm-up means for, after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; catalyst temperature detecting means for detecting temperature of the catalyst; and catalyst early warm-up deciding means for deciding whether to perform the catalyst early warm-up control by the catalyst early warm-up means on the basis of the temperature of the catalyst; wherein the catalyst temperature detecting means estimates a catalyst temperature on the basis of at least one of element temperature and heater temperature of an air-fuel ratio sensor disposed on at least one of upstream side and downstream side of the catalyst.
Claim 13
Independent Claim
84 words
A method for purifying internal combustion engine exhaust gas, said method comprising: after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; detecting temperature of the catalyst; and determining whether to perform the catalyst early warm-up control based on the temperature of the catalyst; wherein the determining step includes calculating a parameter of the catalyst early warm-up control in accordance with the detected catalyst temperature.
Claim 14
Independent Claim
84 words
A method for purifying internal combustion engine exhaust gas, said method comprising: after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; detecting temperature of the catalyst; and determining whether to perform the catalyst early warm-up control based on the temperature of the catalyst; wherein the determining step includes calculating a parameter of the catalyst early warm-up control in accordance with the detected catalyst temperature.
Claim 15
Independent Claim
86 words
A method for purifying internal combustion engine exhaust gas, said method comprising: after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; detecting temperature of the catalyst; and determining whether to perform the catalyst early warm-up control based on the temperature of the catalyst; wherein the detecting step includes estimating a catalyst temperature based on coolant temperature of the internal combustion engine and duration of engine stoppage.
Claim 16
Independent Claim
86 words
A method for purifying internal combustion engine exhaust gas, said method comprising: after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; detecting temperature of the catalyst; and determining whether to perform the catalyst early warm-up control based on the temperature of the catalyst; wherein the detecting step includes estimating a catalyst temperature based on coolant temperature of the internal combustion engine and duration of engine stoppage.
Claim 17
Independent Claim
103 words
A method for purifying internal combustion engine exhaust gas, said method comprising: after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; detecting temperature of the catalyst; and determining whether to perform the catalyst early warm-up control based on the temperature of the catalyst; wherein the detecting step includes estimating a catalyst temperature based on at least one of element temperature and heater temperature of an air-fuel ratio sensor disposed on at least one of an upstream side and downstream side of the catalyst.
Claim 18
Independent Claim
103 words
A method for purifying internal combustion engine exhaust gas, said method comprising: after an internal combustion engine is started, performing catalyst early warm-up control to quickly increase temperature of a catalyst provided in an exhaust passage of the internal combustion engine; detecting temperature of the catalyst; and determining whether to perform the catalyst early warm-up control based on the temperature of the catalyst; wherein the detecting step includes estimating a catalyst temperature based on at least one of element temperature and heater temperature of an air-fuel ratio sensor disposed on at least one of an upstream side and downstream side of the catalyst.
Claim 19
Independent Claim
45 words
A method for purifying internal combustion engine exhaust gas with a catalyst in an exhaust passage, said method comprising: detecting a state of the catalyst; and closing the exhaust passage after the internal combustion engine has stopped based on the detected state of the catalyst.
Claim 20
Independent Claim
45 words
A method for purifying internal combustion engine exhaust gas with a catalyst in an exhaust passage, said method comprising: detecting a state of the catalyst; and closing the exhaust passage after the internal combustion engine has stopped based on the detected state of the catalyst.
Claim 21
Dependent Claim
31 words
A method as in claim 12 wherein: the detecting step includes determining whether the catalyst is activated; and the closing step is performed if the catalyst is detected as being activated.
Claim 22
Dependent Claim
28 words
A method as in claim 12 further comprising: opening the exhaust passage if operation for restarting the internal combustion engine is performed while the exhaust passage is closed.
Claim 23
Dependent Claim
41 words
A method as in claim 12 further comprising: if the exhaust passage is closed after the internal combustion engine has stopped, opening the exhaust passage when at least a predetermined length of time elapses after the internal combustion engine has stopped.
Claim 24
Dependent Claim
80 words
A method as in claim 12 wherein said closing step comprises: producing a drive force in a closing direction by using an operating pressure from a pressure source, and producing a drive force in an opening direction by using a spring force, the pressure means gradually attenuating the operating pressure while the exhaust passage is closed, and the pressure means allowing the spring force to open the exhaust closing means when the operating pressure becomes less than the spring force.
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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) | 2001-12-07 | 2002-06-08 | 2002-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-07 | 2006-06-08 | 2006-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-07 | 2010-06-08 | 2010-12-08 | $7700.00 | Window Closed / Lapsed |