外文翻译-A Comprehensive Thermal Management System Model for Hybrid Electric Vehicles.doc

（本文截取的是一篇国外学生的毕业论文中的一段 论文名字是“A Comprehensive Thermal Management System Model for Hybrid Electric Vehicles”） The automotive industry is facing unprecedented challenges due to energy and environmental issues. The emission regulation is becoming strict and the price of oil is increasing. Thus, the automotive industry requires high-efficiency powertrains for automobiles to reduce fuel consumption and emissions. Among high-efficiency powertrain vehicles, Hy-brid Electric Vehicles (HEVs) are under development and in production as one potential solution to these problems. Thus, one of the most critical objectives of the HEV development is improving fuel economy. There are many ways of maximizing the fuel econo-my of a vehicle such as brake power regeneration，efficient engine operation，parasitic loss minimization，reduction of vehicle aerodynamic drag, and engine idle stop. Figure 1 compares the balance of the energy of a conventional vehicle with a hybrid electric vehicle。As can be seen in Figure 1, the hybrid vehicle saves fuel by utilizing engine idle stop, brake power regeneration, and efficient engine operation. Figure 1 also shows that the fuel consumed by the accessories, which include Vehicle Cooling System (VCS), Climate Control System (CCS), and electric accessories, is not negligible compared with the fuel consumed by the vehicle propulsion system. In addition, the portion of the energy consumption of the accessories in HEVs is bigger than that of conventional vehicles. This observation suggests that the efficient accessory system, particularly the VCS and CCS, is more important in high-efficiency vehicles because they have more effect on the fuel economy. The effect of the auxiliary load on the fuel economy of high-efficiency vehicles studied by Farrington et al [2]. They examined the effect of auxiliary load on vehicle fuel economy via a focus on climate control system. Figure 2 compares the impact of auxiliary load, i.e. the power consumed by accessory systems,