Speed control strategy for pump-motor hydraulic transmission subsystem in hydro-mechanical continuously variable transmission.

Hydro-mechanical continuously variable transmission is mainly composed of a pump-motor hydraulic transmission subsystem, a mechanical transmission subsystem, a power shunt device, and a power coupling device. Among them, the pump-motor hydraulic transmission subsystem, as a speed control element, has a serious effect on the speed control performance of hydro-mechanical continuously variable transmission. However, the poor controllability and stabilization of the output speed during variable speed input and load disturbance greatly limit the further development of the speed control performance of hydro-mechanical continuously variable transmission. To address these problems, this paper proposes an adaptive speed tracking compound control strategy that is based on neural network model reference adaptive control, seeker optimization algorithm, fuzzy control algorithm, and the PID controller. Simulation and testing results show that the control effect of the proposed strategy is more obvious than that of the traditional speed control strategies based on particle swarm optimization algorithm-PID and genetic algorithm-PID, and its applicability under the complicated working conditions is enhanced. This study can serve as a basis for the design and practical application of the pump-motor hydraulic transmission subsystem of hydro-mechanical continuously variable transmission in engineering and agricultural machinery. [ABSTRACT FROM AUTHOR]