US4867115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cranking fuel control method and apparatus for combustion engines
Assignee: Wayne State University
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Filing: 1986-10-29
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Granted: 1989-09-19
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Expires: 2006-10-29
Abstract
Abstract A cranking fuel control method and apparatus for combustion engines. The method includes the steps of delaying the injection of fuel to the engine until one or more of the operating parameters of the engine, such as the engine rotational speed, the crankshaft rotation angle or the cylinder gas combustion pressure has reached a predetermined value. The fuel is then injected into the cylinder(s) at the required quantity for optimum starting of the engine. The method and apparatus can be used in fuel pumps with mechanical governors or with engines having electronic fuel controls.
Inventors
- 👤 Naeim A. Henein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:16
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/02; F02D35/023; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/062; F02D41/064; F02D41/30; F02D41/38; F02D41/40; F02D41/406; F02D41/407; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
104 words
A method for controlling the injection of fuel into a combustion engine, the combustion engine operating at substantially a full operating load at a time interval after ignition of the engine, comprising the steps of: restricting the amount of the fuel injected into the combustion engine after engine cranking starts to substantially zero for a predetermined amount of time; and delaying the injection of fuel into the combustion engine at the full operating load of the combustion engine for a predetermined amount of time after engine cranking starts, until the injection of fuel at the full operating load of the combustion engine is appropriate.
Claim 2
Independent Claim
104 words
A method for controlling the injection of fuel into a combustion engine, the combustion engine operating at substantially a full operating load at a time interval after ignition of the engine, comprising the steps of: restricting the amount of the fuel injected into the combustion engine after engine cranking starts to substantially zero for a predetermined amount of time; and delaying the injection of fuel into the combustion engine at the full operating load of the combustion engine for a predetermined amount of time after engine cranking starts, until the injection of fuel at the full operating load of the combustion engine is appropriate.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the injection of fuel is delayed until an engine operating parameter has reached a predetermined value.
Claim 4
Dependent Claim
28 words
The method of claim 2 wherein the fuel is injected at the full operating load of the combustion engine when the cylinder compression pressure reaches a predetermined value.
Claim 5
Dependent Claim
36 words
The method of claim 1 further including the steps of: sensing the rotational speed of the engine; sensing the crankshaft rotation angle of the crankshaft of the engine; and sensing the engine cylinder gas compression pressure.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein the restricted fuel injected is gradually increased at a predetermined rate after the start of the cranking of the engine.
Claim 7
Independent Claim
105 words
An apparatus for controlling the injection of fuel into a combustion engine, the combustion engine operating at substantially a full operating load at a time interval after ignition of the engine, comprising: means for restricting the amount of the fuel injected into the combustion engine after engine cranking starts to substantially zero for a predetermined amount of time; and means for delaying the injection of fuel into the combustion engine at the full operating load of the combustion engine for a predetermined amount of time after engine cranking starts, until the injection of fuel at the full operating load of the combustion engine is appropriate.
Claim 8
Independent Claim
105 words
An apparatus for controlling the injection of fuel into a combustion engine, the combustion engine operating at substantially a full operating load at a time interval after ignition of the engine, comprising: means for restricting the amount of the fuel injected into the combustion engine after engine cranking starts to substantially zero for a predetermined amount of time; and means for delaying the injection of fuel into the combustion engine at the full operating load of the combustion engine for a predetermined amount of time after engine cranking starts, until the injection of fuel at the full operating load of the combustion engine is appropriate.
Claim 9
Dependent Claim
23 words
The apparatus of claim 6 wherein the delaying means includes means for sensing when one engine operating parameter has reached a predetermined value.
Claim 10
Dependent Claim
17 words
The apparatus of claim 7 wherein the engine operating parameter is the engine cylinder gas compression pressure.
Claim 11
Dependent Claim
41 words
The apparatus of claim 6 wherein the means for delaying further includes: means for sensing the rotational speed of the engine; means for sensing the crankshaft rotation angle of the engine; and means for sensing the engine cylinder gas compression pressure.
Claim 12
Dependent Claim
26 words
The method of claim 1, further comprising overriding the start signal after a specified amount of time to guard against a malfunction in the sensor circuit.
Claim 13
Dependent Claim
16 words
The apparatus of claim 6, wherein the fuel is injected into a cylinder of the engine.
Claim 14
Dependent Claim
16 words
The method of claim 1, further comprising initially sensing the start of cranking of the engine.
Claim 15
Dependent Claim
15 words
The method of claim 1, wherein the internal combustion engines include gasoline, and diesel engines.
Claim 16
Dependent Claim
17 words
The apparatus of claim 6, further comprising means for sensing the start of cranking of the engine.
Claim 17
Dependent Claim
15 words
The apparatus of claim 6, wherein the internal combustions engines include gasoline, and diesel engines.
References Cited (Backward Citations)
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Cited
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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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |