Patent US4080937A successfully refreshed from Google Patents.
US4080937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-compressing four-cycle internal combustion engine with direct fuel injection
Assignee: Daimler Benz AG
•
Filing: 1976-03-26
•
Granted: 1978-03-28
•
Expires: 1996-03-26
Abstract
Abstract An air-compressing four-cycle internal combustion engine with direct fuel injection, especially for the drive of motor vehicles, in which a first injection valve is provided for injecting fuel into a combustion space which is so constructed and arranged that good outputs with favorable fuel consumption are attainable; in lieu of the first injection valve, a second injection valve can be selectively operated which is fed with fuel from a second injection pump or from a separate pump plunger and which is so constructed and arranged that low combustion noises are achieved without regard to output and consumption.
Inventors
- 👤 Gerhard Wolters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:59
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/02; F02M59/08; F02B; F02B3/00; F02B3/06; F02B3/08; F02M63/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/14; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
An air-compressing four-cycle internal combustion engine with direct fuel injection, which comprises a first injection valve means for injecting fuel supplied from a first injection pump into a combustion space means only when the internal combustion engine is operated in highway traffic, said first injection valve means being so designed as regards construction and arrangement that an optimal output of the internal combustion engine is attainable with favorable fuel consumption, characterized in that a second injection valve means is provided for injecting fuel supplied from a second injection pump into the combustion space means, said second injection valve means being so designed as regards construction and arrangement thereof that low combustion noises are achieved without regard to an output of the internal combustion engine and a consumption of the fuel, and in that means are provided for selectively operating said second injection valve means in lieu of said first injection valve means such that only the second injection pump is effective when the internal combustion engine is operated in city traffic.
Claim 2
Dependent Claim
171 words
An air-compressing four-cycle internal combustion engine with direct fuel injection, which comprises a first injection valve means for injecting fuel supplied from a first injection pump into a combustion space means only when the internal combustion engine is operated in highway traffic, said first injection valve means being so designed as regards construction and arrangement that an optimal output of the internal combustion engine is attainable with favorable fuel consumption, characterized in that a second injection valve means is provided for injecting fuel supplied from a second injection pump into the combustion space means, said second injection valve means being so designed as regards construction and arrangement thereof that low combustion noises are achieved without regard to an output of the internal combustion engine and a consumption of the fuel, and in that means are provided for selectively operating said second injection valve means in lieu of said first injection valve means such that only the second injection pump is effective when the internal combustion engine is operated in city traffic.
Claim 3
Dependent Claim
25 words
An internal combustion engine according to claim 1, characterized in that the combustion space means is provided in the piston of the internal combustion engine.
Claim 4
Dependent Claim
25 words
An internal combustion engine according to claim 1, characterized in that fuel is fed to the second injection valve means from a separate pump plunger.
Claim 5
Dependent Claim
56 words
An internal combustion engine according to claim 1, characterized in that the first injection valve means is constructed as multi-apertured nozzle and is so arranged that the discharged fuel jets are essentially air-distributed while the second injection valve means is so constructed and arranged that the discharged fuel is essentially wall-distributed at the combustion space wall.
Claim 6
Dependent Claim
20 words
An internal combustion engine according to claim 4, characterized in that the first injection valve means is a four-hole nozzle.
Claim 7
Dependent Claim
42 words
An internal combustion engine according to claim 4, characterized in that the second injection valve means is constructed as single-hole nozzle in which the discharged fuel jet is directed tangentially to the circumference of the combustion space means against the walls thereof.
Claim 8
Dependent Claim
20 words
An internal combustion engine according to claim 6, characterized in that the first injection valve means is a four-hole nozzle.
Claim 9
Dependent Claim
25 words
An internal combustion engine according to claim 7, characterized in that fuel is fed to the second injection valve means from a second injection pump.
Claim 10
Dependent Claim
25 words
An internal combustion engine according to claim 7, characterized in that fuel is fed to the second injection valve means from a separate pump plunger.
References Cited (Backward Citations)
US1378176A
Cited
US1758375A
Cited
US2030086A
Cited
US2975772A
Cited
US3469564A
Cited
US3580230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |