| 摘要 |
A controller of variable displacement compressor being employed in the load control of an air conditioner, especially the air conditioner for vehicle, where various air conditioning modes are set while taking account of such conditions as the operating condition of the engine or the traveling condition of a vehicle. In the controller (10), a control signal providing means (15) provides the solenoid (211) in the capacity control valve (21) of a variable displacement compressor (20) with a pulse signal having a frequency different for air conditioning control and compressor load control based on the determination of a compressor control means (13) receiving various kinds of information. At the time of air conditioning control, the capacity control valve is controlled with a conduction current smoothed by the inductance of the solenoid when it is turned on/off with a high frequency pulse. At the time of compressor load control, the capacity control valve is controlled as a release valve of on/off control with a low frequency pulse regardless of the suction pressure of a pressure sensitive mechanism (213). The set values are determined, respectively, by the duty ratio of a driving frequency pulse and, at the time of compressor load control, the compressor control means controls the compressor torque T to fall within a specified range by altering the duty ratio. Such a controller can properly controls load on a variable displacement compressor used in an on-vehicle air conditioner.
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