Model prediction control method of hub hydraulic motor auxiliary drive system

Abstract

The invention aims at solving the problems that in an existing hub hydraulic drive system control method, the time-varying characteristic of system efficiency is ignored, control parameter calibrationis complex, control accuracy is poor, and self-adaptive control of a system cannot be guaranteed, provides a model prediction control method of a hub hydraulic motor auxiliary drive system and belongs to an automobile control system. In the control method, according to a kinetic equation and the actual control requirement of a hub hydraulic drive vehicle transmission system and with considerationof the characteristics that hydraulic system efficiency varies time to time along with the parameters such as temperature, pressure and the rotation speed, a vehicle transmission system kinetic modelis established, a control increment acting on system model prediction control is solved through a derivation feedback control law, and design of a model prediction controller based on time-varying efficiency is finished. The method has the advantages that the control parameters are optimized through consideration of the efficiency time-varying problem of the system, meanwhile, the feedback control law is explored, the accuracy of a control algorithm and the self-adaptive ability of system control are improved, quick self-adjustment of the system is achieved, and it is guaranteed that the vehicle traction performance is optimal.

Description

technical field [0001] The invention belongs to an automobile control system, and in particular relates to a model predictive control method of a hub hydraulic motor auxiliary drive system. Background technique [0002] The driving conditions of heavy-duty commercial vehicles are complex and changeable. When driving on rough roads, muddy snow and steep slopes and other harsh road conditions with low adhesion coefficients, wheel slippage is prone to occur, resulting in insufficient driving force. Hub hydraulic motor auxiliary drive system (hereinafter referred to as "wheel hub hydraulic drive system") is a set of short-term auxiliary drive system, which can drive the hydraulic motor installed in the hub of the non-drive wheel through the hydraulic pump to provide auxiliary driving force, thereby improving the vehicle's performance in harsh conditions. Compared with mechanical all-wheel drive vehicles, it has the advantages of simple structure, small dead weight, and flexible ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems that the existing wheel hub hydraulic drive system control method ignores the time-varying characteristics of system efficiency, the calibratio

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