To improve the stability of the mode switching process of the hydro-mechanical transmission(HMT)
an HMT mode switching scroll coordinated control method is proposed. By analyzing the principle of HMT mode switching and establishing the switching process model
this method formulates a rolling coordinated control strategy based on model predictive control(MPC)for the torque of the mode switching mechanism and the displacement ratio adjustment of the hydraulic speed control system. Taking reducing the HMT output speed error and vehicle impact as the goal
a rolling coordinated controller with state constraints was designed. Simulation and test results show that
compared with the non-rolling coordinated control method
this method can reduce the output torque and speed fluctuation during the mode switching process; the dynamic load is reduced by 32.9%
the impact degree is reduced by 37.31%
and the mode switching time is reduced by 0.28 s. The displacement ratio adjustment makes the output speed basically consistent before and after the mode switching
which has a better control effect on the mode switching process and can greatly improve the switching quality. The research results provide a reference for the practical application of hydro-mechanical transmission device.
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references
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