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Mathematical Problems in Engineering
Volume 2016, Article ID 9523251, 17 pages
Research Article

Study on the Control Strategy of Shifting Time Involving Multigroup Clutches

1School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
2School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000, China
3Axle Branch Company, IVECO Co. Ltd., Nanjing 212028, China

Received 22 August 2015; Revised 17 November 2015; Accepted 18 November 2015

Academic Editor: Weiguo Xia

Copyright © 2016 Zhen Zhu 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.


This paper focuses on the control strategy of shifting time involving multigroup clutches for a hydromechanical continuously variable transmission (HMCVT). The dynamic analyses of mathematical models are presented in this paper, and the simulation models are used to study the control strategy of HMCVT. Simulations are performed in Simulation platform to investigate the shifting time of clutches under different operating conditions. On this basis, simulation analysis and test verification of two typical conditions, which play the decisive roles for the shifting quality, are carried out. The results show that there are differences in the shifting time of the two typical conditions. In the shifting process from the negative transmission of hydromechanical ranges to the positive transmission of hydromechanical ranges, the control strategy based on the shifting time is switching the clutches of shifting mechanism firstly and then disengaging a group of clutches of planetary gear mechanism and engaging another group of the clutches of planetary gear mechanism lastly. In the shifting process from the hydraulic range to the hydromechanical range, the control strategy based on the shifting time is switching the clutches of hydraulic shifting mechanism and planetary gear mechanism at first and then engaging the clutch of shifting mechanism.