Power Uninterrupted Shift Strategy of Electric Loader Based on Coordinated Control of Drive Motor and Wet Clutch

doi:10.3901/JME.2022.11.046

Abstract

Abstract: In order to improve the advantage of electric driving and increase endurance for electric construction machinery, the hydraulic torque converter with low transmission efficiency of traditional models is coupled with the planetary gear transmission, and the driving motor directly drives a self-developed power shift transmission. The movement state of the wet clutch in each stage is analyzed, and a simplified dynamic model of the shift process of the drive motor power shift transmission is established. Aiming at the non-linear and time-varying system in the shift process of the electric ideal transmission scheme, a power uninterrupted shift strategy of Electric Loader based on the coordinated control of driving motor and wet clutch is proposed. By the coordinated control of clutch pressure and drive motor speed, torque closed-loop, the ideal pressure build-up stage adaptive control is realized. In the inertia phase, the sliding friction controller is designed, and the PID algorithm is used to control the drive motor to output the appropriate torque, so that the combined wet clutch speed difference can track the desired speed difference trajectory. Finally, the co-simulation model based on AMESim and Matlab/Simulink is studied, and the test platform is built to verify the correctness and feasibility of the control theory and control strategy, which provides a reference for the transmission system scheme and shift control of electric construction machinery in the future.

Key words: construction machinery, pure electric drive, transmission, electro-hydraulic control, power uninterrupted, shift quality

CLC Number:

TH139

CAI Shaole, CHEN Qihuai, LIN Tianliang, REN Haoling, FU Shengjie, XU Mingkai. Power Uninterrupted Shift Strategy of Electric Loader Based on Coordinated Control of Drive Motor and Wet Clutch[J]. Journal of Mechanical Engineering, 2022, 58(11): 46-56.

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