Study On Thermal Management System Of Distributed Hybrid Electric Special Vehicle

The distributed hybrid power system offers different driving modes according to different vehicle driving requirements, and it makes the vehicle components be arranged easily at the same time.Therefore it has become the important research direction of dynamic system for special vehicle. The Integrity of thermal manageme nt system for high-power special vehicle can ensure the normal thermal state of driveline under different running conditions. It can ensure the working reliability, dynamic performance, economics and emission performance at the same time. A certain type of new hybrid electric vehicle is analyzed and the thermal management system matching its driveline is researched and advanced then.Design the thermal management system for high-power special vehicle.The heat transfer characteristics of the distributed hybrid power system is analysed. The calorific value of all the thermal source of electric vehicle is completed.The running conditions and driving form of research object are analyzed, and design different cooling systems based on different running conditions so as to determine the connection forms between the thermal source of electric vehicle and heat dissipation equipments, and study on the heating system used in cold region at the same time. The key technical parameters of cooling system such as flux of cooling water and cooling air volume are determined so as to choose the type of pump and cooling fan according to the key technical parameters of cooling system. Complete the thermodynamic calculation of cooling system and then calculate the size of radiator. Design control strategy of thermal management system at last to complete the design and research of the new thermal management system for high-power special vehicle.Finish the air-side flow field simulation of the thermal management system.Carry on the three-dimensional modelling to the cooling fan in the CATIA software, then use CFD software NUMECA to study the condition of static pressure. Carry on the three-dimensio na l modelling to the vehicle engine compartment, then use CFD software fluent to complete the flow field simulation so as to make clear the air drag characteristics of the whole vehicle engine compartment, study the matching degree between the selected cooling fan and the whole thermal management system.Do the experimental measurement of thermal management system. Put up the radiator test-bed to test the heat transfer performances and wind resistances of two radiators which have the same size but different fin shapes. The constant power heating circuit is designed to test the two radiators with different fin forms such as rippled round and multiple rippled round.Complete the vehicle loading test to check if the components selected and the arrangement form of the whole vehicle engine compartment are suitable or not.