US4411241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling EGR for internal combustion engines
Assignee: Suzuki Motor Corp
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Filing: 1982-03-23
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Granted: 1983-10-25
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Expires: 2002-03-23
Abstract
Abstract An internal combustion engine has a primary intake passage including a primary throttle valve for supplying engine cylingers with an air-fuel mixture under a full range of loads, a secondary intake passage including a secondary throttle valve for supplying the engine cylinders with an air-fuel mixture under high loads, and an exhaust-gas recirculation passage including an exhaust-gas recirculation valve for introducing an exhaust gas into the primary intake passage. Vacuums at the primary and secondary throttle valves are utilized to control the exhaust-gas recirculation valve. A distributor for producing ignition sparks is also controlled by the vacuums at the primary and secondary throttle valves for ignition timing. The engine also includes a first mechanism for retarding ignition sparks and a second mechanism for promoting engine idling. When the exhaust-gas recirculation valve is controlled, the second mechanism is released, immediately thereafter air is introduced from the secondary intake passage into the primary intake passage for air-fuel ratio control therein, and the first mechanism is released. When the secondary intake passage comes into operation, fuel vapor is introduced from a canister into the secondary intake passage.
Inventors
- 👤 Tokuzi Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:35
CPC Classifications
F; F02; F02D; F02D37/00; F02D37/02; F02M; F02M1/00; F02M1/08; F02M1/10; F02M11/00; F02M11/02; F02M25/00; F02M25/08; F02M25/089; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M3/00; F02M3/06; F02M3/062; F02M7/00; F02M7/23; F02M7/24; F02M7/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, and an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, said method comprising the step of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary intake passage to control said exhaust-gas recirculation valve.
Claim 2
Independent Claim
97 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, and an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, said method comprising the step of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary intake passage to control said exhaust-gas recirculation valve.
Claim 3
Independent Claim
109 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, and a distributor for producing ignition sparks, said method comprising the step of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary intake passage to control said exhaust-gas recirculation valve and said distributor for ignition timing.
Claim 4
Independent Claim
109 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, and a distributor for producing ignition sparks, said method comprising the step of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary intake passage to control said exhaust-gas recirculation valve and said distributor for ignition timing.
Claim 5
Independent Claim
139 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, a first mechanism for retarding ignition sparks, and a second mechanism for promoting engine idling, said method comprising the steps of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary intake passage to control said exhaust-gas recirculation valve, releasing said secondary mechanism, immediately thereafter introducing air from said secondary intake passage into said primary intake passage for air-fuel ratio control therein, and releasing said first mechanism.
Claim 6
Independent Claim
139 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, a first mechanism for retarding ignition sparks, and a second mechanism for promoting engine idling, said method comprising the steps of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary intake passage to control said exhaust-gas recirculation valve, releasing said secondary mechanism, immediately thereafter introducing air from said secondary intake passage into said primary intake passage for air-fuel ratio control therein, and releasing said first mechanism.
Claim 7
Independent Claim
123 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, and a canister for collecting fuel vapor from engine parts, said method comprising the steps of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary passage to control said exhaust-gas recirculation valve, and introducing fuel vapor from said canister into said secondary intake passage when the latter comes into operation.
Claim 8
Independent Claim
123 words
A method of controlling exhaust-gas recirculation for an internal combustion engine having a primary intake passage for supplying an air-fuel mixture under a full range of loads, a secondary intake passage for supplying an air-fuel mixture under high loads, an exhaust-gas recirculation passage having an exhaust-gas recirculation valve for introducing an exhaust gas into said primary intake passage, and a canister for collecting fuel vapor from engine parts, said method comprising the steps of utilizing a vacuum at a primary throttle valve in said primary intake passage and a vacuum at a secondary throttle valve in said secondary passage to control said exhaust-gas recirculation valve, and introducing fuel vapor from said canister into said secondary intake passage when the latter comes into operation.
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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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |