| 摘要 |
An electronic control system for controlling the air-fuel ratio for an internal combustion engine comprising an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by an air-fuel mixture supply device, a comparing circuit for comparing the output signal of a detector with a reference value, an integration circuit connected to the comparing circuit, a pulse generator, and a comparator for producing pulses for driving the on-off type electromagnetic valve from output signals of the integration circuit and of the pulse generator for controlling the air-fuel ratio to a value substantially equal to the stoichiometric air-fuel ratio. A first converter converts the operation of the throttle valve to an electric quantity output, a second converter converts the prevailing ambient atmospheric pressure to another electric quantity output. Further, there is provided switches actuated by the output signals of the first converter for rendering the integration circuit non-responsive to the output of the detector and responsive to the output of the second converter.
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