What is the difference between the air conditioning system of Corolla hybrid vehicle and the traditional automobile air conditioning system?

The air conditioning structure principle and internal refrigerant pressure of hybrid electric vehicle are the same as those of traditional automobile air conditioning system. The main difference lies in the compressor. The traditional automobile compressor is driven by the engine through a belt, and the refrigeration performance is achieved by adjusting the swash plate angle of the compressor through ECU. The hybrid compressor is driven by a motor, and the refrigeration performance is completed by HCU (Hybrid Control Module) controlling the motor speed, that is, the compressor speed.

The traditional compressor only uses the voltage of 12V for control, while the electric air-conditioning compressor not only uses the voltage of 12V for control, but also uses a high-voltage driving motor for operation.

In the warm air operation mode, the traditional car uses a blower to transport the hot air heated by the engine cooling water indoors, and the cooling water provided by the cooling water pump circulates to the warm air box. In electric mode, the engine may not work, and the additional electric warm water pump provides heated cooling water circulation to the heater core.

The traditional mechanical compressor can only provide low refrigeration output when the engine is idling, while the electric compressor can provide constant refrigeration output.

The electric compressor is a non-belt structure, and its installation position is not limited by belt connection, so it can be installed at any position of the vehicle. The main control elements of electric compressor are microprocessor and frequency converter. The microprocessor receives the target speed command of the compressor from the air conditioning controller to provide the required power for the motor; In addition, the actual speed information of the motor is fed back, and the current is provided to the air conditioning controller for closing control.

The inverter converts the 270V DC supplied to the compressor into AC current, receives the command from the microprocessor, and provides the required power to the compressor motor. The control part of the electric compressor also includes a current detection circuit and a high-voltage capacitor.

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