Minimizing synchronization time of a gear shifting mechanism by optimizing its structural design parameters

Abstract

A gear shifting mechanism is modeled in GT-Suite software. The mechanism has three main bodies: sleeve, ring, and gear. Results obtained from the simulation show that GT-Suite model can predict gear shifting process. Synchronization processes for three conditions of nominal, road grade, and vibrational motion of the master are studied in six cases by considering the sleeve and the gear as a master alternatively. The optimization based on the GT-Suite model is performed for each case to find the minimum gear shifting time based on variations of 17 structural design parameters. Minimum synchronization time is found almost same in all cases. It is concluded from closeness of the optimization results that average of the parameter values can be considered as optimized values for all cases. At the end, robustness of the optimized structural design parameters are analyzed with respect to the road grade, amplitude, and frequency of oscillatory excitation of rotational motion of the master.

Analysis and experiment of HMT stationary shift control considering the effect of oil bulk modulus

“…To solve the above problems, Zhang, 9 Yang et al, 10 and Yin 11 respectively proposed control strategies for the shifting timing and the shifting time of multiple sets of brakes, and the rationality of the strategies was verified by experiments. Irfan et al, 12 Sung et al, 13 and Zhang et al, 14 respectively, used GT-Suite model, network analysis, and genetic algorithm to optimize the structure of HMT, improving the transmitting efficiency of the system and reducing the fuel consumption. However, all of the above studies are based on the mechanical structure, without considering the effect of oil characteristics on the shift quality.…”

“…2 In order to improve the power and economy of vehicles equipped with HMT, scholars have done a lot of research on the influencing factors, control strategies, and layout structure. [3][4][5][6][7][8][9][10][11][12][13][14] However, the poor dynamic quality of the HMT during the shifting between different ranges affects its wide application in heavy vehicles. Thus, Ni et al, 3 Zhu et al, 4 and Hu et al 5 analyzed the order of the effects of different physical parameters of the transmission on the shift quality by experiments.…”