Composite auxiliary machine for a vehicle and a control unit thereof

摘要

A composite auxiliary machine for a vehicle has proper startup performance in starting an engine. The composite auxiliary machine has a compressor for compressing a refrigerant inside a refrigeration cycle device, a rotary machine connected to the compressor and rotated together therewith, a drive pulley for operating the rotary machine in response to a driving force from the vehicle engine, and a clutch device for transmitting and terminating the driving force of the drive pulley. The rotary machine functions as a generator and an electric motor. A variable displacement mechanism is provided in the compressor to vary an amount of discharge per revolution. A control unit controls to engage the clutch device in starting the vehicle engine, and actuates the rotary machine as an electric motor to actuate the vehicle engine. Then, an amount of discharge of a refrigerant is controlled to become smaller than that necessary in the refrigeration cycle device.