IDLE REVOLUTION-NUMBER CONTROLLER FOR INTERNAL- COMBUSTION ENGINE

摘要

PURPOSE:To prevent sharp variation of the number of engine revolutions which is caused by the variation of load by generating control pulses at the time independent from the idle revolution feedback control pulses in the case when the load operation of an engine is started in idling or the abnormal low-speed revolution of the engine is detected. CONSTITUTION:A throttle valve 8 installed into an intake pipe 7 varies the opening degree in idling by turning a lever 19 installed onto the shaft of the throttle valve by an actuator 20 including a dc motor 21. Said dc motor 21 is controlled by a control circuit 30 into which each output signal of an idle switch 24, revolution-number detector 25, A/C.SW 28, and a speed varying switch 29 is input. When the control circuit 30 detects the start of the load operation of an air conditioner, etc. in idling or the abnormal low-speed revolution of the engine, said control circuit 30 generates the control pulses for varying the opening degree of the throttle valve at the time independent from the control pulses generated by the idle revolution feedback control means.