Method of controlling idling rotational speed of internal combustion engine for vehicles equipped with air conditioning systems

摘要

A method of controlling the idling rotational speed of an internal combustion engine for an automotive vehicle equipped with an air conditioning system having a variable capacity compressor disposed to be driven by the engine and capable of being controlled by an external control signal. A value of a capacity control signal as the external control signal for controlling the capacity of the compressor is calculated. A value of torque required for starting the compressor is calculated based upon ambient temperature and the calculated value of the capacity control signal. The engine idling rotational speed is increased in accordance with the calculated starting torque. When the ambient temperature is higher than a predetermined value, the required starting torque is calculated based only upon the ambient temperature irrespective of the calculated value of the capacity control signal, whereas when the ambient temperature is lower than the predetermined value, the required starting torque is calculated based upon both the ambient temperature and the calculated value of the capacity control signal.