Gearshift performance improvement for an electromagnetic gearshift system based on optimized active disturbance rejection control method

Abstract

Electric automated manual transmission usually adopts direct current motors and intermediate gearings to accomplish gear change. The structure can be simplified further to achieve better dynamic response and mechanical efficiency. A new type of gearshift system which adopts two electromagnetic linear actuators is presented. The intermediate gearings including motion converters are canceled, and the electromagnetic linear actuators drive the shift fork directly to move the synchronizer to engage different gears. The novel gearshift system is described in detail, including the connection, working principle, and performance. Specific working phases of the synchronization are introduced and mathematical equations of each phase are provided. After the specific feature analysis of each phase, the performance effect factors are deduced and the corresponding control requirements are proposed. Considering the stability of the performance, the robust control method, namely, active disturbance rejection control, is adopted. The time optimal method is introduced to optimize the dynamic response of the active disturbance rejection control method to achieve a shorter gearshift time. Comparative simulations among the active disturbance rejection control, time optimal-active disturbance rejection control, and proportional-integral-derivative methods show the distinct improvements of the novel gearshift system combined with the time optimal-active disturbance rejection control method. Finally, gearshift experiments are implemented. The results demonstrated the availability of the novel gearshift system and the designed control strategy.

Precise and coordinated gearshift control for AMT gearshift system equipped with two linear actuators

“…Consequently, this study designs a type of direct drive gearshift system that makes use of two linear actuators. Thanks to its quick dynamic performance, simple structure, and linear movement, the linear actuator finds extensive use as an actuator in industrial applications, including machine tools, robotic drivers, electromagnetic valves, vehicle suspension, and linear compressors [2][3][4][5].…”

Synchroniser control with proportional pressure reducing valves and displacement feedback

“…25 A current feedforward ADRC method was adopted to track the optimised curve of the shift force during the synchronisation stage. 26 It seems that the shift displacement and the shift force are coupled together in the synchroniser control. Further the synchroniser moving resistance changes dramatically in the synchroniser operation.…”