US5005547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abnormal combustion-detecting device and combustion control device for internal combustion engines
Assignee: Honda Motor Co Ltd
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Filing: 1989-06-29
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Granted: 1991-04-09
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Expires: 2009-06-29
Abstract
Abstract An abnormal combustion-detecting device and a combustion control device for internal combustion engines. Ignition timing for the cylinders is set in accordance with engine operating conditions. The set ignition timing for at least one of the cylinders is retarded when the engine is in a predetermined operating condition. Abnormal combustion caused by postignition within the at least one cylinder is detected when the set ignition timing is retarded. When abnormal combustion is detected within the at least one cylinder, temperature within the cylinders is lowered, thereby positively preventing possible occurrence of preignition.
Inventors
- 👤 Toshiyuki Suga
- 👤 Hideaki Arai
- 👤 Shinichi Kitajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:26
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1512; F02P17/00; F02P17/02; F02P17/04; F02P5/152; F02P5/1522; F02P5/1523; G; G01; G01L; G01L23/00; G01L23/22; G01L23/221; G01L23/225; F02P17/12; F02P2017/125; F02P2017/128; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
103 words
An abnormal combustion-detecting device for an internal combustion engine having cylinders, which detects abnormal combustion of an air-fuel mixture supplied to said cylinders to inhibit preignition of the mixture, comprising: ignition timing-setting means for setting ignition timing for said cylinders in accordance with operating conditions in which said engine is operating; ignition timing-retarding means for retarding the set ignition timing for at least one of said cylinders when said engine is in a predetermined operating condition; and abnormal combustion-detecting means operable only when said ignition timing-retarding means has retarded the set ignition timing, for detecting abnormal combustion within said at least one cylinder.
Claim 2
Dependent Claim
103 words
An abnormal combustion-detecting device for an internal combustion engine having cylinders, which detects abnormal combustion of an air-fuel mixture supplied to said cylinders to inhibit preignition of the mixture, comprising: ignition timing-setting means for setting ignition timing for said cylinders in accordance with operating conditions in which said engine is operating; ignition timing-retarding means for retarding the set ignition timing for at least one of said cylinders when said engine is in a predetermined operating condition; and abnormal combustion-detecting means operable only when said ignition timing-retarding means has retarded the set ignition timing, for detecting abnormal combustion within said at least one cylinder.
Claim 3
Dependent Claim
30 words
An abnormal combustion-detecting device as claimed in claim 1, wherein said ignition timing-retarding means retards the set ignition timing to a timing later than timing of possible occurrence of postignition.
Claim 4
Dependent Claim
116 words
A combustion control device for an internal combustion engine having cylinders, which controls combustion of an air-fuel mixture supplied to said cylinders, comprising: ignition timing-setting means for setting ignition timing for said cylinders in accordance with operating conditions in which said engine is operating; ignition timing-retarding means for retarding the set ignition timing for at least one of said cylinders when said engine is in a predetermined operating condition; abnormal combustion-detecting means for detecting abnormal combustion within said at least one cylinder when said ignition timing-retarding means retards the set ignition timing; and cylinder temperature-lowering means for lowering temperature within said cylinders when said abnormal combustion-detecting means detects abnormal combustion within said at least one cylinder.
Claim 5
Dependent Claim
116 words
A combustion control device for an internal combustion engine having cylinders, which controls combustion of an air-fuel mixture supplied to said cylinders, comprising: ignition timing-setting means for setting ignition timing for said cylinders in accordance with operating conditions in which said engine is operating; ignition timing-retarding means for retarding the set ignition timing for at least one of said cylinders when said engine is in a predetermined operating condition; abnormal combustion-detecting means for detecting abnormal combustion within said at least one cylinder when said ignition timing-retarding means retards the set ignition timing; and cylinder temperature-lowering means for lowering temperature within said cylinders when said abnormal combustion-detecting means detects abnormal combustion within said at least one cylinder.
Claim 6
Dependent Claim
31 words
A combustion control device as claimed in claim 3, wherein said predetermined operating condition is a condition that a temperature of said engine is higher than a predetermined high temperature value.
Claim 7
Dependent Claim
26 words
A combustion control device as claimed in claim 4, wherein the temperature of said engine is the temperature of intake air being supplied to said engine.
Claim 8
Dependent Claim
21 words
A combustion control device as claimed in claim 4, wherein the temperature of said engine is the temperature of engine coolant.
Claim 9
Dependent Claim
36 words
A combustion control device as claimed in claim 3, wherein said predetermined operating condition is a condition that a temperature of said engine is within a predetermined range within which said engine can produce high output.
Claim 10
Dependent Claim
26 words
A combustion control device as claimed in claim 7, wherein the temperature of said engine is the temperature of intake air being supplied to said engine.
Claim 11
Dependent Claim
31 words
A combustion control device as claimed in claim 3, wherein said predetermined operating condition is a condition that engine knocking of a magnitude within a predetermined range occurs in said engine.
Claim 12
Dependent Claim
26 words
A combustion control device as claimed in claim 3, wherein said ignition timing-retarding means retards the ignition timing solely for a particular one of said cylinders.
Claim 13
Dependent Claim
23 words
A combustion control device as claimed in claim 10, wherein said cylinder temperature-lowering means retards simultaneously the ignition timing for all said cylinders.
Claim 14
Dependent Claim
30 words
A combustion control device as claimed in any of claims 3 to 11, wherein said cylinder temperature-lowering means retards the ignition timing for said cylinders by a predetermined time period.
Claim 15
Dependent Claim
29 words
A combustion control device as claimed in any of claims 3 to 11, wherein said cylinder temperature-lowering means retards the ignition timing for said cylinders by a predetermined angle.
Claim 16
Dependent Claim
48 words
A combustion control device as claimed in any of claims 3 to 11, wherein said cylinder temperature-lowering means carries out the retardation of the ignition timing over a predetermined time period, and thereafter progressively advances the ignition timing from the retarded ignition timing to the set ignition timing.
Claim 17
Dependent Claim
43 words
A combustion control device as claimed in any of claims 3 to 11, wherein said abnormal combustion-detecting means comprises means for detecting ionic current created by combustion within said at least one cylinder, and detecting abnormal combustion based upon the detected ionic current.
Claim 18
Dependent Claim
46 words
A combustion control device as claimed in claim 15, wherein said abnormal combustion-detecting means judges that abnormal combustion occurs within said at least one cylinder when the ionic current has occurred a predetermined number of times or more during said predetermined operating condition of said engine.
Claim 19
Dependent Claim
48 words
A combustion control device as claimed in any of claims 3 to 11, wherein said abnormal combustion-detecting means comprises means for optically sensing flame caused by combustion within said at least one cylinder, and detecting abnormal combustion within said at least one cylinder based upon the sensed flame.
Claim 20
Dependent Claim
55 words
A combustion control device as claimed in any of claims 3 to 11, wherein said abnormal combustion-detecting means comprises means for detecting a change rate in the rotational speed of said engine, and detecting abnormal combustion within said at least one cylinder based upon the detected change rate in the rotational speed of said engine.
Claim 21
Dependent Claim
49 words
A combustion control device as claimed in any of claims 3 to 11, wherein said abnormal combustion-detecting means comprises means for detecting a change rate in torque from said engine, and detecting abnormal combustion within said at least one cylinder based upon the detected change rate in the torque.
Claim 22
Dependent Claim
43 words
A combustion control device as claimed in any of claims 3 to 11, wherein said abnormal combustion-detecting means comprises means for detecting a change rate in pressure within said at least one cylinder, and detecting abnormal combustion detected change rate in the pressure.
References Cited (Backward Citations)
JPS5575629A
Cited
US4458646A
Cited
JPS59213948A
Cited
US4790279A
Cited
US4487184A
Cited
US4846128A
Cited
US4727841A
Cited
US4802455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |