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Optimal design and applicability of electric power steering system for automotive platform

汽车平台电动转向系统的优化设计及适用性

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Abstract

The ongoing need for better fuel economy and lower exhaust pollution of vehicles has increased the employment of electric power steering (EPS) in automotives. Optimal design of EPS for a product family reduces the development and fabrication costs significantly. In this paper, the TOPSIS method along with the NSGA-II is employed to find an optimum family of EPS for an automotive platform. A multi-objective optimization problem is defined considering road feel, steering portability, RMS of Ackerman error, and product family penalty function (PFPF) as the conflicting objective functions. The results for the single objective optimization problems and the ones for the multi-objective optimization problem, as well as two suggested trade-off design points are presented, compared and discussed. For the two suggested points, performance at one objective function is deteriorated by about 1%, while the commonality is increased by 20%–40%, which shows the effectiveness of the proposed method in first finding the non-dominated design points and then selecting the trade-off among the obtained points. The results indicate that the obtained trade-off points have superior performance within the product family with maximum number of common parts.

摘要

对更好的燃油经济性和降低汽车尾气污染的持续需求增加了电动转向(EPS)在汽车中的应用。 产品系列的(EPS)优化设计可大大降低开发和制造成本。本文采用 TOPSIS 和 NSGA-II 相结合的方法, 寻找汽车平台 EPS 的最优系列, 提出了一个多目标优化问题.该问题将道路感、转向便携性、Ackerman 误差的均方根和产品系列罚函数作为相互制约的目标函数。给出了单目标优化问题和多目标优化问题 的结果, 并提出了两个折衷设计点, 进行了比较和讨论。对于这两个折衷设计点, 一个目标函数的性 能下降了约 1%, 而共性增加了 20%~40%, 说明了该方法在首先找到非主导设计点, 然后在得到的点 之间进行权衡的有效性。结果表明, 所得到的折衷点在公共部件数量最大的产品系列中具有较好的性 能。

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Authors and Affiliations

  1. Automotive Simulation and Optimal Design Research Laboratory, School of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran

    Abolfazl Khalkhali, Mohammad Hassan Shojaeefard, Masoud Dahmardeh & Hadi Sotoudeh

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  1. Abolfazl Khalkhali
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  2. Mohammad Hassan Shojaeefard
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  4. Hadi Sotoudeh
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Khalkhali, A., Shojaeefard, M.H., Dahmardeh, M. et al. Optimal design and applicability of electric power steering system for automotive platform. J. Cent. South Univ. 26, 839–851 (2019). https://doi.org/10.1007/s11771-019-4053-3

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