| 摘要 |
A system for controlling the air-fuel ratio for an internal combustion engine comprises an O2 sensor for detecting the concentration of a constituent of exhaust gases passing through the exhaust passage, a carburetor for supplying air-fuel mixture to the induction passage of the engine, electromagnetic valves for correcting the air-fuel ratio of the air-fuel mixture supplied by the carburetor, a comparator for comparing the output signal of the O2 sensor with reference to a reference value, an integrating circuit having a proportional circuit for integrating the output of the comparator, a driving circuit for driving the electromagnetic valve in dependency upon the output signal of the integrating circuit. The system further comprises a detecting device for detecting the acceleration of the engine, a switch for cutting out a part of the control operation of the integrating circuit, and a gate circuit responsive to outputs of the comparator and the detecting device for actuating the switch, whereby the control operation of the system is decreased under the condition of a lean air-fuel mixture supply and acceleration of the engine.
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