某乘用车热管理系统的评估和优化

Evaluation and Optimization of a Passenger Vehicle Thermal Management System

文章采用“试验摸底—勘察评估—仿真分析—优化设计—试验验证”的研究流程,对某乘用车在低速高负荷工况下容易“开锅”的问题进行了研究。通过整车热平衡试验初步评估热管理系统,对整车企业提出的问题进行复现;对热管理系统建立研究体系,对影响因素进行勘察评估;进行仿真计算,对现场勘察提出的空气侧问题进行验证;建立空气侧优化体系并进行优化设计,结果表明,加装导流风道和密封以及将油冷器下移0.2 m,散热器散热量的优化率为10.1%和8.4%;对优化方案进行试验验证,结果表明,许用环境温度上升到51.2℃。

Using the research process of"pre-compliance test-investigation and evaluation-simulation analysis-optimization design-test verification",the problem that a passenger vehicle is easy to"boil"under low-speed and high-load condition is studied.The thermal management system is evaluated preliminarily through the vehicle heat balance test,and the problems raised by the manu⁃facturer are repeated.The research system of thermal management system is established,and the in⁃fluencing factors are investigated and evaluated.The simulation calculation is carried out to verify the air side problem proposed by the field investigation.The air side optimization system is established and optimized design is carried out.The results show that the optimization rates of heat dissipation of the radiator are 10.1%and 8.4%when the diversion duct and seal are installed and the oil cooler is moved down by 0.2 m.The test results show that the allowable ambient temperature rises to 51.2℃.