Research On Thermal Management System And Control Strategy Of Hybrid Electric Vehicle

With the popularity of automobiles worldwide which that vehicle thermal management issues are receiving increasing attention.In recent years,the automotive thermal management systems as an emerging field has great prospects for development.In order to ensuring that the vehicle’s power components can work within a reasonable temperature range.The temperature requirements of various vehicle systems must be reasonably adjusted,which has become an important research and development direction in the field of automotive thermal management technology.Traditional automotive thermal management research mainly focuses on the engine cooling system,while electric vehicles focus on the technical research of power battery thermal management.My article aims at a hybrid light truck,which is taking temperature demand as the key point and according to the characteristics of the truck’s driving mode.A complete vehicle thermal management system is proposed,which mainly includes preheating and heat dissipation.This article mainly designs and establishes a systematic vehicle thermal management system scheme and uses a simulation platform to analyze and verify the control strategy and functions of the thermal management system,thereby developing a vehicle thermal management system.Based on the analysis of the thermal requirements about each power component of a hybrid light truck,a complete vehicle thermal management system solution is proposed according to the characteristics of the driving mode.The design of the solution includes the cooling system of each power component and the engine preheating the power battery in a low temperature environment and the motor warms up the engine in a low temperature environment.According to the parameters of the vehicle’s power components,the parameters of the heat dissipation components in the thermal management system are analyzed and the corresponding theoretical calculations are performed,thereby further deriving a quantitative index of the temperature requirements of the vehicle’s thermal management system.Based on the AMESim software which is a hybrid vehicle power system model was first built and the simulation verified that the vehicle power system model meets the basic power requirements.On this basis,a thermal management system model is established and the modular thermal management system is used to simulate the entire thermal management system.Based on the MATLAB / SIMULINK software environment and a control strategy model for the thermal management system of a hybrid vehicle is built,which includes the logic threshold control of the vehicle thermal management system and the fuzzy-PID control of the engine thermal management system.Finally it debugs the operating environment and provides a platform for joint simulation.Finally,the vehicle thermal management system is jointly simulated to verify the heat dissipation capacity of the cooling system of each power component and using the engine heat to preheat the battery to increase the battery temperature and using the motor heat to preheat the engine to increase the engine temperature.The simulation results show that This thermal management system has sufficient cooling capacity under high ambient temperature and the use of engine heat to warm up the battery under low temperature environment can improve the battery efficiency and the warming up of the motor to the engine under low temperature environment can improve the engine starting effect and reduce the emissions.This verifies that the design and functions of the vehicle thermal management system meet the requirements.