Control system for internal combustion engines

Details Control system for internal combustion engines Control system for internal combustion engines

1992-12-17

1994-02-22

Nelli, Raymond A.

Internal-combustion engines

Spark ignition timing control

Electronic control

123425, F02P 500, F02P 514

Patent

active

052878368

ABSTRACT:
A control system for an internal combustion engine determines ignition timing of the engine and generates an ignition command signal to generate high voltage for discharging a spark plug provided for each cylinder of the engine. The control system detects sparking voltage generated across the spark plug when the high voltage is generated. The control system measures a duration over which the sparking voltage across the spark plug exceeds a predetermined reference value, after generation of the ignition command signal. According to a first aspect of the invention, the control system detects combustion roughness based on the duration measured. According to a second aspect of the invention, the control means detects an air-fuel ratio of an air-fuel mixture supplied to the engine, based on the duration measured.

REFERENCES:
patent: 3952715 (1976-04-01), Van Siclen, Jr.
patent: 3996911 (1976-12-01), Canup
patent: 4315492 (1982-02-01), Gardner
patent: 4884206 (1989-11-01), Mate
patent: 5078112 (1992-01-01), Ikeura
patent: 5146893 (1992-09-01), Ohsawa
patent: 5180984 (1993-01-01), Murata et al.
patent: 5189373 (1993-02-01), Murata et al.

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