US5228423A
Expired / Lapsed
US
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Dual-fuel engine
Assignee: Honda Motor Co Ltd
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Filing: 1992-10-13
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Granted: 1993-07-20
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Expires: 2012-10-13
Abstract
Abstract In a dual-fuel internal combustion engine which can selectively use gaseous fuel such as CNG or liquid fuel such as gasoline, a pair of intake passages are independently connected to a combustion chamber of the engine, and a gaseous fuel supply device and a liquid fuel supply device are provided in the corresponding intake passages so that the liquid and gaseous fuels may not mix with each other when the fuel for the engine is switched over one from the other as they are introduced into the combustion chamber through different intake passages. Further, by switching the operating mode of the intake valve when changing the fuel, the configuration of the intake passage can be optimized for each fuel, and the timing and the lift of the intake valves may also be optimized for each fuel without complicating the control structure of the overall system. The present invention can improve the torque output and the emission property of the dual-fuel engine.
Inventors
- 👤 Toshihiro Oikawa
- 👤 Shunichi Tsuzuki
- 👤 Yuji Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:48
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/0223; F02D13/0226; F01; F01L; F01L1/00; F01L1/26; F01L1/267; F02B; F02B69/00; F02D13/0257; F02D19/00; F02D19/06; F02D19/0602; F02D19/0613; F02D19/0615; F02D19/0639; F02D19/0642; F02D19/0647; F02D19/0663; F02D19/0686; F02D19/0692; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10026; F02M35/10045; F02M35/104; F02M35/108; F02M35/1085; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
A dual-fuel internal combustion engine which can selectively use gaseous fuel or liquid fuel, comprising: a combustion chamber defined in the engine; a pair of intake passages independently communicating with said combustion chamber; a gaseous fuel supply device provided in one of said intake passages; and a liquid fuel supply device provided in the other of said intake passages.
Claim 2
Dependent Claim
59 words
A dual-fuel internal combustion engine which can selectively use gaseous fuel or liquid fuel, comprising: a combustion chamber defined in the engine; a pair of intake passages independently communicating with said combustion chamber; a gaseous fuel supply device provided in one of said intake passages; and a liquid fuel supply device provided in the other of said intake passages.
Claim 3
Dependent Claim
51 words
A dual-fuel engine according to claim 1, wherein said intake passages communicate with said combustion chamber via respective intake valves, said intake valves being actuated by a valve actuating mechanism which can actuate said intake valves in different modes depending on whether said gaseous fuel or said liquid fuel is used.
Claim 4
Dependent Claim
20 words
A dual-fuel engine according to claim 2, wherein said different modes provide different valve actuating timings for said intake valves.
Claim 5
Dependent Claim
31 words
A dual-fuel engine according to claim 3, wherein the timing of opening said intake valves when said gaseous fuel is used is more delayed than when said liquid fuel is used.
Claim 6
Dependent Claim
50 words
A dual-fuel engine according to claim 1, wherein said intake passages communicate with said combustion chamber via respective intake valves, and both of said intake valves are actuated when said liquid fuel is used but substantially only one of said intake valves is actuated when said gaseous fuel is used.
Claim 7
Dependent Claim
37 words
A dual-fuel engine according to claim 1, wherein said gaseous fuel is used when said engine is in a low speed range, and said liquid fuel is used when said engine is in a high speed range.
Claim 8
Dependent Claim
29 words
A dual-fuel engine according to claim 1, further comprising a throttle valve passage, a downstream end of said throttle valve passage being bifurcated into said pair of intake passages.
Claim 9
Dependent Claim
32 words
A dual-fuel engine according to claim 7, wherein said gaseous fuel supply device is provided in said one of said intake passages immediately downstream of a point where said intake passages bifurcate.
Claim 10
Dependent Claim
27 words
A dual-fuel engine according to claim 7, wherein said liquid fuel supply device is provided in said other intake passage adjacent each intake port of said engine.
References Cited (Backward Citations)
US3364911A
Cited
US3918419A
Cited
US4275698A
Cited
WO1983001486A1
Cited
US4489699A
Cited
JPS5877152A
Cited
US4476827A
Cited
JPS595851A
Cited
US4479466A
Cited
US4479466B1
Cited
US4635609A
Cited
JPS62214238A
Cited
US5178119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |