IDLE SPEED ADJUSTING SYSTEM FOR INTERNAL COMBUSTION ENGINE

IDLE SPEED ADJUSTING SYSTEM FOR INTERNAL COMBUSTION ENGINE An idle speed adjusting system for effecting feedback control of the idle speed of an internal combustion engine comprises a reference control amount output circuit for producing and delivering a reference control signal necessary for maintaining a command engine speed; a speed controller for generating a speed correction signal representing the offset of the running speed of the engine from the command engine speed; a flow rate controller for controlling the flow rate of intake air supplied to the engine, in accordance with the reference control signal and the speed correction signal; and an auxiliary flow rate controller for controlling the flow rate of the intake air in accordance with the speed correction signal and independently of the flow rate controller, so as to adjust the speed correction signal to a predetermined value. In the system, there is provided an ambient air temperature sensor for delivering an ambient air temperature signal to the reference control amount output circuit so as to vary the reference control signal in accordance with a change in the ambient air temperature.