The Simulation And Experimental Research For The Hybrid Special Vehicle’s Cooling System

Low exhaust is the merit of electric vehicle and traditional internal combustion vehicle has advantages in power density, the hybrid electric vehicle(HEV) has both the advantages of electric vehicle and internal combustion vehicle, it plays a connecting role in the transformation process between electric vehicle and internal combustion vehicle.The heat power system management put forward higher requirements for these characteristics. How to design a reasonable cooling system, guarantee the heat source components under different conditions to work within a reasonable range of temperature is very important.This paper around the hybrid special vehicle’s cooling system has carried on about several aspects of research:First do research. on the heat production and heat transfer characteristics for the hybrid special vehicle’s heat source parts. According to the characteristics of the heat source components will be set up for the three child cooling system of the cooling system, they are the high temperature cooling system, the middle temperature system and the low temperature system,do some work for the various heating parts for their heat production models and the construction of the heat dissipation models, at the same time set up heat production relations with the corresponding dynamic system. Use the heating and cooling model structures, set up the vehicle’s cooling system simulation model, use the heat generating model do some research under the continuous working conditions for the cooling effect, and under separate conditions, such as normal straight road condition, cross-country road and climbing road conditions of uniform heating characteristics when driving, do the simulation by using the simulation software SIMULINK, verify the rationality of the design of the system.Secondly study from the perspective of the cooling system optimization, considering the limited power capsule space,the space requirements are different for the different power capsule radiator arrangement.so according to different heater arrangement, designed three kinds of radiator power capsule space layout modes, using the GT- SUITE software do simulation for these three different structures, getting the heat transfer characteristic curves, chooseing radiator combination which takes up the little space under meeting the cooling demand.Finally do the bench test for the cooling system, bench test is mainly to verify that energy transfer under various operating conditions in the power system and cooling system for the power consumption, and to validate the reliability of the whole hybrid system. Hybrid system battery pack is placed in battery pack ark, test and control system are in control rooms, control room for the bench test can be global control. Focus on the motor and oil/water heat exchanger data collection and analysis, combined with the simulation results comparing with the experimental analysis, the rationality of the design of the cooling system is verified.