Shift Strategy of Electric Drive Loader with Compound Control of Motor and Clutch

doi:10.16183/j.cnki.jsjtu.2020.409

Abstract

Abstract:

To give full play to the advantages of pure electric drive, and aimed at the transmission system of electric loader, the low efficiency hydraulic torque converter and reverse direction clutch of traditional models are cancelled. By analyzing the shift law of the pure electric drive system, the electro-hydraulic shift control system is used to control the wet clutch, and based on the feedback of pressure and speed, combined with the driving motor active working in the speed and torque mode, the matching of torque and speed in the process of clutch engagement and disengagement is realized. For a 50-type pure electric drive loader, a shift control strategy of pure electric drive loader based on composite control of drive motor and clutch pressure is proposed. The result of vehicle test shows that the proposed control strategy can give full play to the advantages of pure electric drive. The shift time is reduced by about 50%, the sliding friction work is greatly reduced, and the maximum shift impact is 14.08 m/s³, which is within the recommended limit value of 17.64 m/s³ for Chinese vehicles.

Key words: loader, pure electric drive, compound control, control strategy, shift quality

CLC Number:

TH137

REN Haoling, CAI Shaole, CHEN Qihuai, LIN Tianliang, LANG Bin. Shift Strategy of Electric Drive Loader with Compound Control of Motor and Clutch[J]. Journal of Shanghai Jiao Tong University, 2022, 56(2): 173-181.

Figures/Tables 12

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参数	取值
活塞外径/mm	185
活塞内径/mm	139
活塞行程/mm	3
质量块质量/kg	4.5
复位弹簧刚度/(N·m^-1)	30000
复位弹簧预紧力/N	1200
油液黏性阻尼系数/(N·s·m^-1)	100
泵转速/(r·min^-1)	1500
泵排量/(mL·r^-1)	10
系统工作稳定压力/MPa	1.6

模式	档位	i
乌龟模式	1挡	4.505
乌龟模式	2挡	2.333
兔子模式	1挡	1.126
兔子模式	2挡	0.583

参数	取值
整车重量/kg	17400
驱动桥速比	4.375
轮边速比	5.2
轮胎半径/m	0.808