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research-article

Position and Force Switching Control for Gear Engagement of Automated Manual Transmission Gear-shift Process

[+] Author and Article Information
Xiangyu Wang

The State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
18810567146@163.com

Liang Li

The State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; The Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
liangl@mail.tsinghua.edu.cn

Kai He

The State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
hek15@mails.tsinghua.edu.cn

Yahui Liu

The State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
liuyahui@tsinghua.edu.cn

Congzhi Liu

The State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
15281063684@163.com

1Corresponding author.

ASME doi:10.1115/1.4039184 History: Received April 15, 2017; Revised December 11, 2017

Abstract

Gear-shift control is essential in automated manual transmission (AMT) systems, because it has a significant influence on comfort of vehicle and lifespan of AMT. Gear engagement process is the most important part of gear-shift process, and it has multi-stage and nonlinear characteristics, which makes it difficult to realize smooth and fast control. This paper proposes a position and force switching control scheme for gear engagement. At the beginning and the end of gear engagement process, the combination sleeve is supposed to reach the desired position quickly with a small resistance, for which a position controller is designed by using sliding mode control (SMC) method. A force controller is designed for the mid synchronizing stage, because the combination sleeve is blocked at this stage until the synchronization is finished. Simulations and experiments are carried out to show that gear-shift quality is improved and gear-shift shock is reduced greatly by proposed method.

Copyright (c) 2018 by ASME
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