【正文】 外文資料翻譯 1 （本文截取的是一篇國外學生的畢業(yè)論文 中的一段 論文名字是“ A Comprehensive Thermal Manage ment System Model for Hybrid Electric Vehicles”） The automotive industry is facing unprecedented challenges due to energy and environmental issues. The emission regulation is being strict and the price of oil is increasing. Thus, the automotive industry requires highefficiency powertrains for automobiles to reduce fuel consumption and emissions. Among highefficiency powertrain vehicles, Hybrid 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 economy 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 pares 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 pared 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 highefficiency vehicles because they have more effect on the fuel economy. The effect of the auxiliary load on the fuel economy of highefficiency 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 pares the impact of auxiliary load, . the power consumed by accessory systems, on the fuel economy of the conventional and high fuel economy vehicle. As shown in the figure, a high fuel economy vehicle is much more affected by the auxiliary load than a conventional vehicle. Therefore, more efficient thermal management systems including VCS and CCS are essential for 外文資料翻譯 2 HEV. Figure 1. Energy flow for various vehicle configurations. (A) ICE, the conventional internal bustion, spark ignition engine。 (B) HICE, a hybrid vehicle that includes an electric motor and parallel drive train which eliminates idling loss and captures some energy of braking [1].] 外文資料翻譯 3 Figure 2. Comparison of fuel economy impacts of auxiliary loads between a conventional vehicle and a high fuel economy vehicle [2] Achieving efficient VCS and CCS for HEVs requires meeting particular design challenges of the VCS and CCS. The design of the VCS and CCS for HEVs is different from those for conventional vehicles. VCS design for HEVs is much more plicated than that of conventional vehicles because the powertrain of HEVs has additional powertrain ponents. Furthermore, the additional powertrain ponents are operated at