Electric vehicle cooling system and control algorithm thereof

Abstract

The invention provides an electric vehicle cooling system which comprises three circulating loops: a small circulating loop, a large circulating loop and a warm air loop, wherein the three loops have a shared cooling pipeline, and the shared cooling pipeline is provided with a heat radiator and an electric pump; the small circulating loop is that a cooling liquid sequentially passes through the electric pump, a motor controller and a motor through a cooling pipe, and does not pass through the heat radiator; the large circulating loop is that a cooling liquid sequentially passes through the electric pump, the heat radiator, the motor controller and the motor through a cooling pipe; the warm air loop is that a cooling liquid passes through the electric pump, a warm air heat exchanger, the motor controller and the motor through a cooling pipe; the cooling system also comprises an expansion box; the heat radiator and a pressure-limiting valve of a warm air loop heat exchanger are connected with an upper water port of the expansion box; the lower water port of the expansion box and a main cooling pipe are connected in parallel to a water inlet of the electric pump; temperature sensors are installed at the inlet part of the motor controller, the cooling liquid outlet part of the electric pump and the outlet part of the heat radiator; sensor signals above are all connected to a cooling system control unit; and the cooling system control unit controls the operation of the system according to the information obtained from a vehicle-mounted bus as well as sensor information. The invention also provides a control method for the electric vehicle cooling system, and the normal operation of the power part of the electric vehicle is ensured.

Description

Technical field [0001] The invention relates to a cooling system of an electric vehicle and a control algorithm thereof. Background technique [0002] Since the electric vehicle does not have a traditional engine, its power is all provided by the motor, so the heat dissipation requirements of the electric part are relatively high, and the temperature of the cabin is very high, so the working conditions for the power electronic module are quite harsh. Due to the increase of chip density in the module package, the heat density will also increase, so the research on heat dissipation technology and heat dissipation materials is very important for the normal operation of the module and the life of electronic components. Contents of the invention [0003] In order to overcome the above disadvantages, the present invention provides an electric vehicle cooling system with good heat dissipation effect, timely response and energy saving, and a control method thereof. [0004] The t...

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Problems solved by technology

[0002] Since the electric vehicle does not have a traditional engine, its power is all provided by the motor, so the heat dissipation requirements of the electric part are relatively high, and the temperature of the cabin is very high, so the working conditions for the power electronic module are quite harsh

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