Cold start characteristics at misplaced ignition strategy on the first firing cycle of a dual cylinder linear range extender

Shuojian Wei, Yidi Wei, Jiayu Wang, Zhiyuan Zhang*, Boru Jia*, Yuguo Ma, Chang Liu, Huihua Feng, Zhengxing Zuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The free piston linear range extender (LRE) system is a promising technology for alleviating range anxiety in electric vehicles. In this research, an innovative cold-start optimization method based on ignition phase control is proposed. The effects of the same phase, the phase advance and the phase lag ignition strategies on the cold-start characteristics of the system during the first firing cycle are systematically investigated. Results show that delaying ignition under the same phase strategy significantly improves system performance, increasing operating frequency by 1.10Hz, enhancing thermal efficiency by 7.16 %, and boosting indicated power by 0.65 kW. Maintaining one ignition position constant, the phase advance strategy yields comparatively lower performance, while a suitable phase lag strategy increases operating frequency by 0.25Hz, improves thermal efficiency by 0.76 %, and enhances indicated power by 0.06 kW. Analysis reveals that the appropriate same phase strategy optimizes thermal efficiency and indicated work, while the suitable out-of-phase strategy enhances operating frequency and indicated power. Therefore, flexible selection between the same phase or the phase lag ignition strategies during the cold start phase of the LRE system can optimize system performance and cold start effects.

Original languageEnglish
Article number135324
JournalEnergy
Volume320
DOIs
Publication statusPublished - 1 Apr 2025

Keywords

  • Cold start characteristics
  • Cold start optimization
  • Cold start performance
  • Linear range extender
  • Misplaced ignition strategy

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