Control method and system of electric vehicle air-conditioning compressor

Abstract

The invention discloses a control method and system of an electric vehicle air-conditioning compressor. The control method comprises the steps of controlling operation of the compressor at the first rotation speed after an air conditioner is started; obtaining the temperature set by a user, in-vehicle temperature, out-vehicle temperature, solar radiation intensity, evaporator temperature and compressor rotation speed at intervals of a first long sampling period; judging whether the parameters are within a corresponding normal range or not; indicating that the evaporator temperature is larger than an evaporator temperature threshold value if the parameters are within the corresponding normal range; confirming optimal rotation speed according to the parameters and enabling the compressor to run at the optimal rotation speed if the parameters are not within the corresponding normal range. The control method takes the parameters into consideration to control the rotation speed of the compressor, enables finally-confirmed target rotation speed of the compressor to be reasonable and reduces the fluctuation of the in-vehicle temperature and energy consumption of the electric vehicle to some extent. The long sampling period enables the rotation speed of the compressor to be not frequent and further inhibits the fluctuation of the in-vehicle temperature. The driving comfort requirement can be met to the most extent.

Description

Technical field [0001] The present invention relates to the technical field of electric vehicle air-conditioning compressor control, and in particular to a control method and system for an electric vehicle air-conditioning compressor. Background technique [0002] With the development of electric vehicle technology, the trend of electric vehicle industrialization is becoming more and more obvious, which poses new propositions and challenges to the research and development of electric vehicle air conditioning systems. At present, traditional fuel vehicle air conditioning systems mainly use engine-driven evaporative compression refrigeration systems for cooling. However, for pure electric vehicles and fuel cell vehicles in electric vehicles, it is impossible to directly adopt the solution of traditional automotive air conditioning systems. The vehicle has With high-voltage DC power supply, it has become inevitable for the compressor to be directly driven by a motor. Most elec...

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Problems solved by technology

[0009] In order to solve the problem in the prior art that the temperature in the car fluctuates greatly and affects the driving comfort of the occupants in the car, the present invention provides a control method and system for the air-conditioning compressor of the electric car

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