Research and Application of Lightweight Index for Passenger Cars
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Research and Application of Lightweight Index for Passenger Cars Jun Li1,2 · Ligang Wang3 · Yunxia Chen2 · Hongzhou Lu4 · Haitao Jiang1 Received: 19 November 2019 / Accepted: 8 July 2020 © China Society of Automotive Engineers (China SAE) 2020
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. Keywords Lightweight index · Nominal density · Weight–to–power ratio · Footprint area · Fuel consumption · Electricity consumption · Curb mass · Statistic Abbreviations BEVs Battery electric vehicles C-NCAP China-New Car Assessment Program ICEVs Internal combustion engine vehicles VSP Vehicle-specific power
* Jun Li [email protected] * Haitao Jiang [email protected] 1
Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Chery Automotive Co., Ltd., No. 8, Changchun Road, Economic and Technological Development Zone, Wuhu 241009, Anhui Province, China
3
China Automotive Lightweight Alliance, 7F, Tower 7, NO. 13, Ronghua South Road, Daxing District 100176, Beijing, China
4
CITIC Metal Co., Ltd., Room 1901, Capital Mansion 6, Xin Yuan Annul, Chaoyang District 100004, Beijing, China
1 Introduction With the increasing demand for performance and function, the number and weight of components in vehicles is increasing along with the average curb mass. In China, based on the fuel consumption rate regulation for passenger cars, the targets for vehicle curb weight-based fuel consumption rate have been specified in a stepped manner, which has had a considerable impact on lightweight strategies [1]. Because of the lack of an effective lightweight evaluation system and corresponding industry-level incentive policies, the average curb mass of passenger cars h
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