Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1981-10-05
1983-12-13
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123489, F02B 3300
Patent
active
044199759
ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having an emission control system with a three-way catalytic converter for controlling the air-fuel ratio in accordance with the temperature of the engine and operation of the engine. A temperature sensor for detecting the engine temperature and a negative pressure sensor for detecting the engine manifold vacuum in the induction passage are provided. A feedback control circuit is provided for controlling the air-fuel ratio to the stoichiometric air-fuel ratio in a normal operating condition and for stopping the control operation when the acceleration in the cold engine is detected by the temperature sensor and the negative pressure sensor. A first switch is provided to be actuated by the output of the negative pressure sensor to connect the output of the temperature sensor with the input of the feedback control circuit when the negative pressure is lower than a predetermined value. A second switch is provided to be actuated by the output of the negative pressure sensor to render the feedback control circuit inoperative as a feedback controller, whereby the air-fuel ratio is controlled by the output of the temperature sensor.
REFERENCES:
patent: 4119072 (1978-10-01), Asano
patent: 4291659 (1981-09-01), Suzuki
patent: 4303049 (1981-12-01), Ikeura
patent: 4327689 (1982-05-01), Rachel
Kubota Masaharu
Kudo Ichiro
Ohgami Masaaki
Cox Ronald B.
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Nissan Motor Co,. Ltd.
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