Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1986-04-14
1987-11-17
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, 123492, 123493, F02M 1700
Patent
active
047066334
ABSTRACT:
This invention relates to a control system for feedback control of the air/fuel ratio in an internal combustion engine, which may be an automotive engine, by using an oxygen sensor to detect actual values of the air/fuel ratio from the concentrations of oxygen in the exhaust gas. The control system has the function of temporarily shifting the feedback control of air/fuel ratio to open-loop control when any of predetermined transient operating conditions of the engine is detected. To resume the temporarily interrupted feedback control at an optimum time-point, the air/fuel ratio control system includes means to detect the degree of warm-up of the engine and means to variably determine the duration of the temporary open-loop control according to the detected degree of warm-up of the engine.
REFERENCES:
patent: 4388905 (1983-06-01), Kurihara
patent: 4419975 (1983-12-01), Kubota
patent: 4545348 (1985-10-01), Ikeura
patent: 4580539 (1986-04-01), Kitahara
Cox Ronald B.
Nissan Motor Co,. Ltd.
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