Control device for electric compressor, and shutdown control method thereof

Abstract

The invention relates to a control device for an electric compressor, and a shutdown control method thereof. The control device comprises a left low-voltage side, a right high-voltage side, a CAN communication chip, an MCU chip, a motor drive chip IPM and a motor control chip DSP, wherein the voltage of the left low-voltage side is lower than that of the right high-voltage side; the left low-voltage side supplies power to the CAN communication chip and the MCU chip; and the right high-voltage side directly supplies power to the motor drive chip IPM, or converts the high voltage to a low voltage and supplies power to the motor control chip DSP and the motor drive chip IPM respectively. A response is timely made in the case that the compressor needs to be shut down through accurate judgement for the shutdown time of the compressor, thus the complaint of a user is effectively avoided, the compressor is prevented from frequently entering a high-voltage working state, and the service life of the compressor is prolonged.

Description

technical field [0001] The invention relates to an automobile electric compressor, in particular to an electric compressor control device and a shutdown control method thereof. Background technique [0002] The development of automobiles has caused excessive consumption of the earth's resources. Energy shortage is an increasingly serious problem faced by all mankind, and it is a global problem. At the same time, cars pollute the environment while bringing convenience to people. In the face of resource shortage and environmental protection issues, the development of electric vehicles and hybrid vehicles has become the mainstream trend of the development of the automobile industry. As the "heart" device of the new energy vehicle air conditioner, the application of the electric compressor will be further promoted. [0003] Since the electric compressor is a new product, some of its control strategies need to be continuously improved. For example, in the current electric com...

AI Technical Summary

Problems solved by technology

For example, in the current electric compressor stop control strategy, the electric compressor controller has a communication failure (the compressor controller cannot receive the vehicle signal) or the vehicle is powered off abnormally (the vehicle key is directly turned OFF when the air conditioner is working) When the compressor is still running for 30 seconds, it will take another 10 seconds to stop, which will cause two problems. First, when the communication fails, the real-time information of the whole vehicle cannot be received. , it will cause the car to be too cold or too hot or the air conditioning system to fail; second, the whole car will still run for 30 seconds after being powered off abnormally and then stop, the noise is too loud and it will give the user the illusion that the whole car cannot be powered off. Faulty air conditioning system causing user complaints

In addition, after the vehicle key is turned to the OFF position, the cooling fan of the condenser does not work, but the compressor is still working, and the pressure of the air conditioning system will rise sharply. The continuous high pressure will also have a great impact on the reliability and durability of the compressor itself. And frequently work in this state, the life of the air conditioning system will also be affected

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