US5237973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-stroke cycle engine
Assignee: Suzuki Motor Corp
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Filing: 1992-11-12
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Granted: 1993-08-24
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Expires: 2012-11-12
Abstract
Abstract In a four-stroke cycle engine in which a combustion chamber is formed by a piston accommodated in a cylinder block and a cylinder head disposed in the cylinder block and respective two suction valves and two exhaust valves are disposed in the combustion chamber, the combustion chamber is divided into two combustion sections each in which one of the suction valves and one of the exhaust valves are disposed. A mixture in a theoretical air-fuel ratio is fed into one of the divided combustion sections and a mixture in an air-fuel ratio corresponding to an engine load is fed into another one of the divided combustion sections, and the air-fuel ratio being changed in response to the engine load. In a case where the mixture in an air-fuel ratio includes an exhaust gas, substantially the same operation is performed, but in this case, the degree of opening of an exhaust gas recirculation valve is controlled so as to control the air-fuel ratio of the mixture.
Inventors
- 👤 Hideharu Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:26
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02B; F02B19/00; F02B19/02; F02B19/04; F02B23/00; F02B23/08; F02F; F02F1/00; F02F1/24; F02F1/242; F02F1/42; F02F1/4214; F02M; F02M26/00; F02M26/13; F02M26/42; F02M26/44; F02M35/00; F02M35/10; F02M35/10006; F02M35/10026; F02M35/10045; F02M35/10072; F02M35/1015; F02M35/10177; F02M35/10209; F02M35/10216; F02M35/10222; F02M35/104; F02M35/108; F02M35/1085; F02B1/00; F02B1/02; F02B1/04; F02B2023/085; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02D41/00; F02D41/30; F02D41/3094; F02F2001/008; F02M2026/001; F02M2026/007; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
In a four-stroke cycle engine in which a combustion chamber is formed by a piston accommodated in a cylinder block and a cylinder head disposed in the cylinder block and respective two suction valves and two exhaust valves are disposed in the combustion chamber, the improvement in which said combustion chamber is divided into two combustion sections each in which one of the suction valves and one of the exhaust valves are disposed, a mixture in a theoretical air-fuel ratio is fed into one of the divided combustion sections and a mixture in an air-fuel ratio corresponding to an engine load is fed into another one of the divided combustion sections, said air-fuel ratio being changed in response to the engine load.
Claim 2
Dependent Claim
122 words
In a four-stroke cycle engine in which a combustion chamber is formed by a piston accommodated in a cylinder block and a cylinder head disposed in the cylinder block and respective two suction valves and two exhaust valves are disposed in the combustion chamber, the improvement in which said combustion chamber is divided into two combustion sections each in which one of the suction valves and one of the exhaust valves are disposed, a mixture in a theoretical air-fuel ratio is fed into one of the divided combustion sections and a mixture in an air-fuel ratio corresponding to an engine load is fed into another one of the divided combustion sections, said air-fuel ratio being changed in response to the engine load.
Claim 3
Dependent Claim
111 words
A four-stroke cycle engine according to claim 1, wherein an engine revolution number is detected by a sensor, and a degree of opening of a throttle valve is detected by a sensor, an amount of fuel to be supplied is controlled by a control unit in response to signals from said both sensors, a mixture in a theoretical air-fuel ratio is fed to one of the combustion sections and the air-fuel ratio of a mixture to be fed into another one of the combustion sections is controlled to change the fuel supply amount in response to the degree of opening of the throttle valve with respect to the engine revolution numbers.
Claim 4
Dependent Claim
105 words
A four-stroke cycle engine according to claim 2, wherein at an engine low load operation period in which the degree of opening of the throttle valve is made small with respect to the engine revolution number, the air-fuel ratio of the mixture to be fed to another one of the combustion sections is made large and, on the contrary, at an engine high load operation period in which the degree of opening of the throttle valve is made large with respect to the engine revolution number, the air-fuel ratio of the mixture to be fed to another one of the combustion sections is made small.
Claim 5
Dependent Claim
126 words
In a four-stroke cycle engine in which a combustion chamber is formed by a piston accommodated in a cylinder block and a cylinder head disposed in the cylinder block and respective two suction valves and two exhaust valves are disposed in the combustion chamber, the improvement in which said combustion chamber is divided into two combustion sections each in which one of the suction valves and one of the exhaust valves are disposed, a mixture in a theoretical air-fuel ratio is fed into one of the divided combustion sections and a mixture including an exhaust gas in an air-fuel ratio corresponding to an engine load is fed into another one of the divided combustion sections, said air-fuel ratio being changed in response to the engine load.
Claim 6
Dependent Claim
126 words
In a four-stroke cycle engine in which a combustion chamber is formed by a piston accommodated in a cylinder block and a cylinder head disposed in the cylinder block and respective two suction valves and two exhaust valves are disposed in the combustion chamber, the improvement in which said combustion chamber is divided into two combustion sections each in which one of the suction valves and one of the exhaust valves are disposed, a mixture in a theoretical air-fuel ratio is fed into one of the divided combustion sections and a mixture including an exhaust gas in an air-fuel ratio corresponding to an engine load is fed into another one of the divided combustion sections, said air-fuel ratio being changed in response to the engine load.
Claim 7
Dependent Claim
133 words
A four-stroke cycle engine according to claim 4, wherein an engine revolution number is detected by a sensor, and a degree of opening of a throttle valve is detected by a sensor, an exhaust gas recirculation valve means is incorporated in association with the combustion chamber, a degree of opening of the exhaust gas recirculation valve means is controlled by a control unit in response to signals from said both sensors, a mixture in a theoretical air-fuel ratio is fed to one of the combustion sections and the air-fuel ratio of a mixture, including an exhaust gas through the exhaust gas recirculation valve means, is fed into another one of the combustion sections is controlled to change the air-fuel ratio of the mixture including the exhaust gas in response to the engine load.
Claim 8
Dependent Claim
95 words
A four-stroke cycle engine according to claim 5, wherein at an engine low load operation period in which the degree of opening of the throttle valve is made small with respect to the engine revolution number, the degree of opening of the exhaust gas recirculation valve means is made large and on the contrary, at an engine high load operation period in which the degree of opening of the throttle valve is made large with respect to the engine revolution number, the degree of opening of the exhaust gas recirculation valve means is made small.
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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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |