及人们对汽车排放问题的广泛关注使得能源转换问题尤为重要。第2段：使用电动汽车能够从某种程度上实现能源转换。但问题是电动汽车的续驶里程比内燃机车短。所以目前要解决的问题是提高电动汽车的速度和续驶里程。
[3] Although urban delivery vehicle applications will help to reduce the dependence of the road transport sector on petroleum-based fuels, the major part of this market requires vehicles that are not limited in range and have a performance compatible with internal combustion, i.e. engine vehicles. The use of advanced traction battery technology to overcome the range limitation of electric vehicles is one possible solution. However, this would still result in a vehicle limited in range and may in itself create additional problems. For example, due to the much greater on- board stored energy, the charging time required will be greater than at present. [4] The range limitations of the pure electric vehicle can be overcome by using a hybrid i.c. engine/electric drive which incorporates both an i.c. engine and an electric traction system. Al- though such a vehicle can be designed to meet a number of objectives, it has been argued that a vehicle which seeks to remove the range limitation of the electric vehicle while substituting a substantial amount of petroleum fuel by electrical energy is the vehicle most worth pursuing. With the emphasis of the vehicle design on the electric drive train, the intention may be to operate in an all-electric mode under urban conditions and to use the i.c. engine for long-distance motorway driving. The hybrid mode could then he used for extending urban range and/or improving vehicle accelerative performance on accelerator kick-down.[5] The concept of a hybrid electric vehicle capable of substituting petroleum fuel is' not new, 第3段：市场要求电动汽车的续驶里程及工作性能与内燃机汽车媲美，但是，即使先进电池可以提高电动汽车的续驶里程，但还会有一些问题不能解决。 第4段：续驶里程可以通过使用混合电动汽车来提高。混合电动汽车上既装有内燃机，又装有电动驱动系统，在必要时使用其中一种系统。第5段：回顾并评述前人关于混合电动汽车
Bosch and Volkswagen having built vehicles in the 1970s. More recently, the advent of the Electric and Hybrid Vehicle Research, Development and Demonstration Programme in the United States of America initiated the design and construction of a Near Term Hybrid Vehicle (NTHV) with the principal aim of substituting petroleum fuel by ' wall plug' electricity. [6] As part of the NTHV programme, a large number of conceptual studies were conducted but on vehicles aimed at the American passenger car market. In this paper optimization studies were conducted, but now on a vehicle suitable for the European medium-sized passenger car market. Such optimization studies are important as, with two sources of traction power available, the way in which they are controlled, and their relative sizing, is fundamental to the way the vehicle performs.[7] Before examining in detail the optimum control strategy for the drive train, Section 2 defines the hybrid arrangement under study. A description of the optimization process using an appropriate cost function is then presented in Section 3 followed by a method of translating the resulting control structure into a sub-optimum algorithm capable of being implemented in real time. Using the optimum control structure the effect of component ratings on the vehicle's performance is evaluated in Section 4, while Section 5 discusses the practical implementation of an overall vehicle control algorithm. Finally, in Section 6, an indication of the vehicle's potential for substituting petroleum fuel by electricity is given. 的研究成果。第二层(第6段第1句话)：指出前人研究的范围具有局限性。关于混合电动汽车的研究只针对美国市场。针对欧洲市场的研究还是空白。第三层(In this paper)本文的研究目的及意义：对欧洲中型客车市场进行优化研究。第四层为第7段：本文的组成部分及各部分的主要内容。
比较简短的论文，引言也可以相对比较简短。为了缩短篇幅，可以用一两句话简单介绍一下某研究领域的重要性、意义或需要

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