Patent US4411241A successfully refreshed from Google Patents.
US4411241A
Expired / Lapsed
US
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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 20:20
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.
References Cited (Backward Citations)
US3294073A
Cited
US3762384A
Cited
US3786793A
Cited
US3766896A
Cited
US3908618A
Cited
US3901202A
Cited
US3941105A
Cited
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 |