US4898143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation control method for internal combustion engines
Assignee: Honda Motor Co Ltd
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Filing: 1989-03-01
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Granted: 1990-02-06
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Expires: 2009-03-01
Abstract
Abstract An exhaust gas circulation control method for an internal combustion engine in which an exhaust gas recirculating valve is arranged across an exhaust gas recirculating passage extending between the exhaust and intake passages. The opening of the valve is controlled in response to operating conditions of the engine. The exhaust gas circulation is inhibited when the engine load exceeds a predetermined value set in response to the engine temperature such that it is set to a smaller value as the engine temperature is lower.
Inventors
- 👤 Sachito Fujimoto
- 👤 Takuya Sugino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:28
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/02; F02D41/04; F02D41/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A method of controlling exhaust gas recirculation in an internal combustion engine having an exhaust passage, an intake passage, an exhaust gas recirculating passage extending between said exhaust passage and said intake passage, and an exhaust gas recirculating valve arranged across said exhaust gas recirculating passage, wherein the opening of said exhaust gas recirculating valve is controlled in response to operating conditions of said engine, the method comprising the steps of: (1) detecting an amount of load on said engine; (2) detecting a value of a temperature of said engine; (3) setting a predetermined value of load on said engine in response to the detected value of the temperature of said engine; and (4) inhibiting the exhaust gas recirculation when the detected amount of load of said engine exceeds said predetermined value.
Claim 2
Independent Claim
132 words
A method of controlling exhaust gas recirculation in an internal combustion engine having an exhaust passage, an intake passage, an exhaust gas recirculating passage extending between said exhaust passage and said intake passage, and an exhaust gas recirculating valve arranged across said exhaust gas recirculating passage, wherein the opening of said exhaust gas recirculating valve is controlled in response to operating conditions of said engine, the method comprising the steps of: (1) detecting an amount of load on said engine; (2) detecting a value of a temperature of said engine; (3) setting a predetermined value of load on said engine in response to the detected value of the temperature of said engine; and (4) inhibiting the exhaust gas recirculation when the detected amount of load of said engine exceeds said predetermined value.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1, wherein said predetermined value is set to a smaller value as the detected value of the temperature of said engine is lower.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 1 or 2, wherein the amount of load on said engine is determined based upon pressure within said intake passage.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 1 or 2, wherein the amount of load on said engine is determined based upon the difference between absolute pressure within said intake passage and atmospheric pressure.
Claim 6
Dependent Claim
30 words
A method as claimed in claim 1, wherein the amount of load on said engine is determined based upon the opening of a throttle valve arranged in said intake passage.
Claim 7
Dependent Claim
17 words
A method as claimed in claim 1, wherein the temperature of said engine is engine coolant temperature.
Claim 8
Dependent Claim
35 words
A method as claimed in claim 1, including the step of detecting intake air temperature of said engine, and wherein said step (3) is executed when the detected intake air temperature exceeds a predetermined value.
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |