Clutch Switching Timing Optimization of Dual-Mode Hydro-Mechanical Transmission Device

To improve the mode switching quality of dual-mode hydro-mechanical transmission (DHMT), orthogonal test and range analysis methods were used to optimize the switching timing sequence of multiple clutches during the switching process. Based on the analysis of DHMT transmission principle and mode switching process, the models of mode switching process and switching quality evaluation index were established. A timing optimization method of DHMT clutch switching based on orthogonal test and range analysis was presented. The orthogonal test table was designed with the switching time sequence of multiple clutches participating in the mode switching process as the influence factor, and orthogonal test simulation was carried out. The range analysis of the simulation results was carried out to get the influence degree of each clutch's switching time sequence on each evaluation index. After comprehensive balance of all indexes, the optimization scheme combination of DHMT clutch switching timing sequence was obtained. The simulation results show that the impact degree of the mode switching process based on the optimization scheme is 6.15 m/s3, lower than the domestic standard of 17.64 m/s3, and the sliding power is 2.80 kJ and the switching time was 1.05 s, both within the reasonable range. The test results are close to the simulation results and the variation trend is consistent, which verifies the correctness of the model built in the paper, and further indicates that the DHMT mode switching quality can be effectively improved by optimizing the timing sequence of clutch switching. This research can provide a theoretical reference for the formulation of control strategy of mode switching process of dual-mode hydro-mechanical transmission device. © 2021, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.