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Mathematical Problems in Engineering
Volume 2013, Article ID 191574, 9 pages
Research Article

Research on Shifting Control Method of Positive Independent Mechanical Split Path Transmission for the Starting Gear

1Science and Technology on Vehicle Transmission Laboratory, Beijing Institute of Technology, Beijing 100081, China
2Patent Examination Cooperation Center of the Patent Office, SIPO, Beijing 100081, China

Received 24 October 2013; Revised 21 November 2013; Accepted 21 November 2013

Academic Editor: Hui Zhang

Copyright © 2013 JunQiang Xi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To realize a smooth and quick shift of the positive independent mechanical split path transmission (PIMSPT) equipped with automatic shifting control system (ASCS), the research on the feasibility of improving shift quality by dynamic and cooperative controlling engine, steering clutches, and brakes has been conducted. The shifting control method suited to starting gear of PIMSPT has been proposed. The control method is based on control parameters, such as the driving shaft speed and its derivative. The control laws of steering clutches and brakes are presented during each gear and stage of shifting. Bench and road test results show that the proposed shifting control method can not only shorten the shift time, but also decrease the jerk of shifting effectively.