Title: Energy management improvement in the charge-sustaining mode of a plug-in hybrid electric vehicle

Authors: Kangjie Liu; Boyang Yu; Yongzheng Sun; Jiyun Xu; Yiqiang Liu; Zhiyu Han

Addresses: School of Automotive Studies, Tongji University, 4800 Cao'an Road, Jiading District, Shanghai 201804, China ' Zhejiang Geely Powertrain Research Institute, No. 918, Binhai 5th Road, Qianwan New Area, Ningbo City, Zhejiang Province, China ' School of Automotive Studies, Tongji University, 4800 Cao'an Road, Jiading District, Shanghai 201804, China ' Zhejiang Geely Powertrain Research Institute, No. 918, Binhai 5th Road, Qianwan New Area, Ningbo City, Zhejiang Province, China ' Zhejiang Geely Powertrain Research Institute, No. 918, Binhai 5th Road, Qianwan New Area, Ningbo City, Zhejiang Province, China ' School of Automotive Studies, Tongji University, 4800 Cao'an Road, Jiading District, Shanghai 201804, China

Abstract: This study investigates a locally optimised dynamic equivalent consumption minimisation strategy (DECMS) and its engineering-improved variant, EI-DECMS, alongside an engineering rule-based switching power following and multi-point strategy (SPM) and its enhanced version, I-SPM, for plug-in hybrid electric vehicles (PHEVs). The EI-DECMS aims to reduce engine start-stop frequency, enhancing vehicle NVH performance. Focusing on the charge-sustaining mode (or range-extension mode), these four strategies were evaluated through road tests and chassis dynamometer experiments. The results indicate that the DECMS strategy not only automates optimisation but also outperforms SPM in fuel economy, achieving reductions of 2.8% to 7.44% in real-world tests and a 13.79% decrease in dynamometer experiments. Additionally, the EI-DECMS strategy results in fewer engine start-stop occurrences and improved state-of-charge balancing compared to both DECMS and I-SPM. Conversely, the I-SPM strategy, after extensive calibration, delivered fuel consumption comparable to that of EI-DECMS, underscoring DECMS's advantage in automated optimisation.

Keywords: plug-in hybrid electric vehicles; PHEVs; range extension; fuel economy; energy management strategy; dynamic equivalent consumption minimisation strategy; DECMS.

DOI: 10.1504/IJPT.2024.144512

International Journal of Powertrains, 2024 Vol.13 No.4, pp.337 - 361

Received: 12 May 2024
Accepted: 11 Oct 2024
Published online: 17 Feb 2025 *

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