Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1981-10-01
1983-11-15
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, 123589, 123585, F02B 3300, F02M 700
Patent
active
044149506
ABSTRACT:
A fail safe device comprising means for detecting a failure in an air/fuel ratio feedback control system and generating a fault signal when such failure is detected, and means responsive to the fault signal to drive an actuator for driving an air/fuel ratio control valve and also responsive to a reference position signal supplied thereto during the above driving, which is generated when the actuator passes its reference position, to stop the actuator at the reference position. The actuator driving/stopping means may comprise means for repeatedly driving the actuator over a predetermined operating range inclusive of the reference position a plurality of times when it is not supplied with the reference position signal upon the actuator passing the reference position, and means for driving the actuator from its extreme operating position to a predetermined position and holding the same there when it is not supplied with the reference position signal even after a predetermined number of times of the above repeated driving of the actuator.
REFERENCES:
patent: 3916848 (1975-11-01), Schmidt
patent: 4075835 (1978-02-01), Hattori
Hasegawa Shumpei
Narasaka Shin
Otsuka Kazuo
Cox Ronald B.
Honda Giken Kogyo Kabushiki Kaisha
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