Research and Application of Lightweight Index for Passenger Cars

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Abstract

Lightweight is an effective design strategy to conserve energy in automotive vehicles. It is a big challenge to evaluate the level of lightweight for passenger cars. This paper summarizes various evaluation methods for lightweight automotive vehicles. A lightweight index [Lv for internal combustion engine vehicles (ICEVs) and Lev for battery electric vehicles (BEVs)] is proposed to assess the lightweight of passenger cars. The proposed lightweight index is composed of the nominal density, weight-to-power ratio, and fuel consumption of footprint area (in the case of ICEVs) or electricity consumption of footprint area (in the case of BEVs). The validity and universality of the proposed lightweight index are demonstrated through a statistical analysis of 7018 ICEV and 326 BEV models. The calculation procedures of the standard partial regression coefficients of statistical multiple regression and elastic coefficients are employed in the proposed method. The results show that either Lv or Lev is most sensitive to the curb mass of the vehicles. The proposed lightweight index can help guide automakers in setting reasonable weight reduction targets during new product development. In addition, the proposed lightweight index can be applied to new hybrid electric vehicles with further efforts, to facilitate the development of lightweight automotive design.

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FAW

轻量化是汽车节能的有效设计策略。评估乘用车的轻量化水平是一个很大的挑战。本文总结了轻量化汽车的各种评价方法。提出了一个轻量化指标[内燃机汽车 (ICEV) 的 Lv 和纯电动汽车 (BEV) 的 Lev] 来评估乘用车的轻量化。提议的轻量化指标包括标称密度、重量功率比和足迹区域的燃料消耗（对于ICEVs）或足迹区域的电力消耗（对于BEVs）。通过对 7018 个 ICEV 和 326 个 BEV 模型的统计分析，证明了所提出的轻量级指标的有效性和普遍性。该方法采用统计多元回归和弹性系数的标准偏回归系数的计算程序。结果表明，Lv 或Lev 对车辆的整备质量最敏感。提议的轻量化指标有助于指导汽车制造商在新产品开发过程中设定合理的减重目标。此外，拟议的轻量化指标可进一步应用于新型混合动力汽车，促进汽车轻量化设计的发展。