Electric vehicle finished-vehicle thermal management system and control method thereof

Abstract

The invention discloses an electric vehicle finished-vehicle thermal management system. The system comprises a motor-radiator loop, a PTC heating loop, a battery pack loop and an air-conditioner loop;heat transfer and heat exchange are achieved among all the loops through valves and a plate heat exchanger, so that the requirements of all parts for heating and cooling are met under different working conditions. By means of the thermal management system, communication of the motor loop, the battery loop and the PTC loop in a thermal management loop is achieved simply through the valves. The invention further discloses a control method of the electric vehicle finished-vehicle thermal management system. According to the control method, a difference value delta T1 between an actual battery operating temperature TB and a standard battery operating temperature T0 and a difference value delta T2 between a motor outlet water temperature TM and the actual motor operating temperature TB are adopted as identification parameters, and a fuzzy control method is utilized for determining a proper loop mode. By means of the control method, the thermal management loop mode is switched in real time according to the actual vehicle condition, and the battery energy consumption is reduced to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of heat management of electric vehicles, and in particular relates to a heat management system of electric vehicles. Background technique [0002] The emergence of electric vehicles has effectively alleviated the energy crisis and environmental pollution. The characteristics of energy saving and environmental protection of electric vehicles also make them become the trend of future automobile development. As the core component of its power system, the battery pack in an electric vehicle plays a decisive role in vehicle performance, cruising range and vehicle safety. However, if the temperature of the battery pack is too high or too low, its working performance will be affected. Therefore, in order to meet the normal operation of electric vehicles under different working conditions, it is necessary to carry out thermal management of the whole vehicle. [0003] At present, most of the existing electric vehicl...

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Problems solved by technology

However, heat exchange between different circuits is less (CN105501071A), and the heat generated by various parts of the automobile cannot be fully utilized, resulting in a large amount of energy waste; or heat exchange between circuits can be realized, but the structure is more complicated and the number of parts is large (CN108099544A)

In the control strategy adopted for switching the thermal management circuit of electric vehicles, a single threshold is often used as the judgment standard to realize the switching of the thermal management circuit mode (CN201610070580), but the single precise threshold is too absolute and is not suitable for complex and changeable battery charging and discharging processes. It may also cause frequent switching between the two working conditions, which will damage the life of the components

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