US5069183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-cylinder engine control method and electronic control apparatus therefor
Assignee: Hitachi Ltd
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Filing: 1989-10-12
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Granted: 1991-12-03
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Expires: 2009-10-12
Abstract
Abstract In a multi-cylinder engine control method and a control apparatus therefor, rotating speeds of the multi-cylinder engine at explosion strokes of the respective cylinders are detected for estimating combustion pressures in the respective cylinders, and deviations of the combustion pressures in the cylinders are derived from the estimated combustion pressures in the respective cylinders, so that ignition timings or fuel amounts supplied to the respective cylinders are regulated in response to the derived deviations of the combustion pressures.
Inventors
- 👤 Masami Nagano
- 👤 Takeshi Atago
- 👤 Mamoru Nemoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:18
CPC Classifications
F; F02; F02D; F02D45/00; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/1455; F02P5/045; F02P5/15; F02P5/1502; F02P5/1508; F02P5/1512; F02P5/153; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A multi-cylinder engine control method comprising detecting rotating speeds of the multi-cylinder engine at explosion strokes of respective cylinders mounted in said engine for obtaining estimated combustion pressures in said respective cylinders, determining respective deviations of said combustion pressures in said cylinders from said estimated combustion pressures in said cylinders, and regulating at least one of ignition timing and fuel amounts supplied to said respective cylinders in accordance with said deviations of said combustion pressures.
Claim 2
Dependent Claim
75 words
A multi-cylinder engine control method comprising detecting rotating speeds of the multi-cylinder engine at explosion strokes of respective cylinders mounted in said engine for obtaining estimated combustion pressures in said respective cylinders, determining respective deviations of said combustion pressures in said cylinders from said estimated combustion pressures in said cylinders, and regulating at least one of ignition timing and fuel amounts supplied to said respective cylinders in accordance with said deviations of said combustion pressures.
Claim 3
Dependent Claim
51 words
A multi-cylinder engine control method according to claim 1, wherein said deviations of said combustion pressures in said respective cylinders are determined by averaging said estimated combustion pressures in said respective cylinders to obtain an average value, and comparing the average value with said estimated combustion pressures in said respective cylinders.
Claim 4
Dependent Claim
34 words
A multi-cylinder engine control method according to claim 1, wherein determining deviations of said combustion pressures in said respective cylinders includes comparing said estimated combustion pressures in said respective cylinders with a predetermined value.
Claim 5
Dependent Claim
162 words
An electronic control apparatus for a multi-cylinder engine comprising: means for detecting engine running conditions, said means including a rotating speed sensor for detecting rotating speeds of said multi-cylinder engine and a cylinder discrimination sensor for discriminating the cylinders; electronic control means for producing control signals to determined at least one of ignition timings and fuel amounts to be supplied to said respective cylinders in response to outputs from said sensor means; wherein said electronic control means comprises means for estimating combustion pressures in said respective cylinders of said multi-cylinder engine at an explosion stroke from the outputs from said rotating speed sensor and said cylinder discrimination sensor, means for calculating deviations of said combustion pressures in said cylinders from said estimated combustion pressures in said respective cylinders, and means for regulating at least one of said ignition timings and said fuel amounts supplied to said respective cylinders in response to said deviations of said combustion pressures obtained by said calculating means.
Claim 6
Dependent Claim
162 words
An electronic control apparatus for a multi-cylinder engine comprising: means for detecting engine running conditions, said means including a rotating speed sensor for detecting rotating speeds of said multi-cylinder engine and a cylinder discrimination sensor for discriminating the cylinders; electronic control means for producing control signals to determined at least one of ignition timings and fuel amounts to be supplied to said respective cylinders in response to outputs from said sensor means; wherein said electronic control means comprises means for estimating combustion pressures in said respective cylinders of said multi-cylinder engine at an explosion stroke from the outputs from said rotating speed sensor and said cylinder discrimination sensor, means for calculating deviations of said combustion pressures in said cylinders from said estimated combustion pressures in said respective cylinders, and means for regulating at least one of said ignition timings and said fuel amounts supplied to said respective cylinders in response to said deviations of said combustion pressures obtained by said calculating means.
Claim 7
Dependent Claim
68 words
An electronic control apparatus for a multi-cylinder engine according to claim 4, wherein said electronic control means further includes means for averaging said estimated combustion pressures in said respective cylinders, and said calculating means for calculating said deviations of said combustion pressures in said electronic control means includes comparing means for comparing said combustion pressures in said respective cylinders with the average so as to obtain said deviations.
Claim 8
Dependent Claim
65 words
An electronic control apparatus for a multi-cylinder engine according to claim 4, wherein said electronic control means further includes means for producing a predetermined reference value of said combustion pressures, and wherein said calculating means for calculating said deviations of said combustion pressures includes comparing means for comparing said combustion pressures in said respective cylinders with said reference value so as to obtain said deviations.
Claim 9
Dependent Claim
30 words
An electronic control apparatus for a multi-cylinder engine according to claim 4, wherein said apparatus further includes means for detecting running conditions of said engine at the time of idling.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |