Multi-cylinder engine control method and electronic control apparatus therefor
First Claim
1. 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.
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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.
33 Citations
7 Claims
- 1. 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.
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4. 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. - View Dependent Claims (5, 6, 7)
- 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;
Specification