Wet clutch pressure hysteresis compensation control under variable oil temperatures for electro-hydraulic actuators

• Published in: Control engineering practice Vol. 141; p. 105723
• Main Authors: Li, Antai, Qin, Datong, Guo, Zheng, Xia, Yu, Lv, Chang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2023
• Subjects: Electro-hydraulic actuator; Hysteresis model; Oil temperature; Pressure control; Wet clutch; Oil temperature; CPO; ESS; VBS; MGPI; GPO; Hysteresis model; Pressure control; Wet clutch; Electro-hydraulic actuator; TDMGPI; DP
• ISSN: 0967-0661; 1873-6939
• DOI: 10.1016/j.conengprac.2023.105723

•The effects of oil temperature on the hysteretic characteristics of the electro-hydraulic actuator are investigated experimentally.•A hysteresis model for electro-hydraulic actuator is established which can reflect the influence of oil temperature well.•A feedforward-feedback controller is designed to improve the pressure tracking error.•The performance of the proposed controller at different oil temperatures is verified experimentally.
The hysteresis characteristics and oil temperatures of wet clutch electro-hydraulic actuators have a significant impact on clutch pressure tracking performance, thereby influencing the launch, shift, and mode transition performance of both fuel and hybrid electric vehicles. In this study, we introduce a novel compensator for wet clutch pressure hysteresis that effectively adapts to variations in oil temperature. Experimental investigations were conducted to examine the hysteresis characteristic of the electro-hydraulic actuator and its susceptibility to changes in oil temperature. Subsequently, a temperature-dependent modified generalized Prandtl–Ishlinskii (TDMGPI) hysteresis model that accounts for the influence of oil temperature was established. To mitigate the effects of oil temperature fluctuations on the controller, we developed a fuzzy proportional-integral-derivative (FPID) controller, which dynamically adjusts controller gain. Furthermore, a feedforward-feedback controller for clutch pressure was established, incorporating the inverse solution of the TDMGPI model as the feedforward component and the FPID controller as the feedback element. The experiments were conducted at various oil temperatures, revealing that the proposed controller significantly enhances response speed and pressure tracking accuracy, maintaining good control performance across the tested range of oil temperatures.