Thermal management system of plug-in hybrid electric vehicle

Abstract

The invention discloses a thermal management system of a plug-in hybrid electric vehicle and belongs to the technical field of hybrid electric vehicles. The thermal management system of the plug-in hybrid electric vehicle comprises a main cold circulation path, and the main cold circulation path conducts heat dissipation on an engine and a speed changing box through a main radiator. The thermal management system is characterized in that the thermal management system further comprises a warm air heating circulation path; the warm air heating circulation path is constituted by a cold circulationbranch path outlet of the engine, an electric heater, a warm air heat exchanger, a first circulation pump, a first two-way valve and a cold circulation branch path inlet of the engine in a communicating mode; and the warm air heating circulation path comprises at least a working mode of cold circulation heating of the engine during working of the engine and a working mode of heating through the electric heater during not working of the engine. The warm air requirement of the vehicle can be met, waste heat generated by heat dissipation of the engine is also fully utilized, so that energy in the vehicle is cycled and utilized reasonably, and accordingly the energy-saving effect is achieved.

Description

technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a thermal management system of a plug-in hybrid electric vehicle. Background technique [0002] With the depletion of global oil resources and strict national emission regulations, electric vehicles are increasingly valued by major domestic vehicle manufacturers because they use renewable electric energy resources and are clean and pollution-free. Major OEMs are competing to invest huge manpower and material resources in the research and development of hybrid electric vehicles, pure electric vehicles, plug-in hybrid electric vehicles, etc., but due to the high technical threshold of hybrid electric vehicles and plug-in hybrid electric vehicles, pure electric vehicles are It is regarded as a direction for domestic automakers to overtake on curves. At present, the mature hybrid models in the domestic market are still mainly imported models, such as Toyota's Coroll...

AI Technical Summary

Problems solved by technology

However, because the plug-in hybrid vehicle adopts a dual-drive structure coupling and a large-capacity battery required by the pure electric drive mode, the technical difficulty is high, and high R&D costs and a long R&D cycle are required. Specifically, the thermal management system needs to meet the overall requirements. The real-time heating and cooling requirements of the vehicle and its main components under various operating conditions such as hybrid mode, pure electric mode, power retention mode, and parking charging mode are the current plug-in hybrid vehicles that need to be overcome. One of the key technologies

[0003] Patent 201520192187.X discloses a battery pack temperature management system that can be used for hybrid electric vehicles. The temperature of the battery pack is managed by means of warm air heating by the air cooling system and liquid cooling by the liquid cooling system, which solves the problem of separate temperature management of the existing battery pack. The inefficiency of using liquid cooling or air cooling for heating or cooling, although it has a certain improvement over the existing technology, only provides a simple thermal management system with both heating and cooling functions for battery pack heating, It does not combine the multiple thermal cycle systems of the hybrid system of the hybrid vehicle to make a comprehensive thermal management system that meets the requirements of the hybrid vehicle

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