Development of the Load Spectrum for Electric Drive System Reliability Test Correlated with Customers’ Usage
Yuzhou Yang 1, Xuan Zhao 1,*, Qiang Yu 1,2,
Shu Wang 1, and Man Yu 3
1 School of Automobile, Chang’an University, Xi’an, China
2. School of Intelligent Vehicle and Engineering, Xi’an Vocational University of Automobile, Xi’an, China
3. School of Construction Machinery, Chang’an University, Xi’an, China
Email: yangyuzhou@chd.edu.cn (Y. Z. Y.); zhaoxuan@chd.edu.cn (X. Z.); qiangyu@chd.edu.cn (Q. Y.); shuwang@chd.edu.cn (S. W.); 364896557@qq.com (M. Y.)
*Corresponding author
Manuscript received March 10, 2023; revised May 10, 2023; accepted November 10, 2023; published April 8, 2024.
Abstract—The electric drive system plays a crucial role in electric vehicles, which has been developing towards an Integrated Electric Drive System (IEDS). The highly integrated technology applied in IEDS can effectively improve the power capacity of electric vehicles. However, it also greatly increases the risk of reliability failure. Based on this, this paper proposes a new methodology for determining the loading spectrum correlated with customers’ usage, which can be applied to assess the mechanical reliability of the IEDS in a bench test. In this method, the “Torque-Speed” coupling impact of IEDS under different customers’ usage scenarios is fully considered. A case study is conducted based on an electric vehicle equipped with an IEDS. Based on the field-tests under sixteen typical customers’ usage scenarios, 3,000km of road load data correlated to the IEDS are collected. Then a loading spectrum is developed for the IEDS bench test and is further compared with several standard spectrum in terms of damage character. The result shows that the damage assessment of the IEDS lifespan (10 years & 300,000km) can be achieved by loading a 721h load spectrum in the bench test. The constructed test spectrum can be equated with the damage under customers’ usage, which validates the effectiveness of the proposed method. Besides, the comparative analysis results also show that the existing reliability test specifications are hard to reproduce the actual load level of customers, so it is strongly suggested to formulate more rational reliability assessment specifications of the IEDS.
Keywords—electric vehicle, load spectrum, mechanical reliability, integrated electric drive system
[PDF]
Cite: Yuzhou Yang, Xuan Zhao, Qiang Yu, Shu Wang, and Man Yu, "Development of the Load Spectrum for Electric Drive System Reliability Test Correlated with Customers’ Usage," International Journal of Modeling and Optimization, vol. 14, no. 2, pp. 44-48, 2024.
Copyright © 2024 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
