Given the transmission efficiency fluctuation and response lag problem of hydromechanical continuous variable transmission combined with the complex and variable working environment of a tractor, an integrated control strategy of engine throttle compensation–hydromechanical continuous variable transmission speed regulation is adopted for dual-flow transmission control. On the basis of the estimation of working resistance, a fuzzy algorithm is used to design the throttle compensation law. Considering the maximum driving power of a tractor as the target of variable speed control, an hydromechanical continuous variable transmission efficiency model is established, and the control law of an hydromechanical continuous variable transmission displacement ratio with the maximum driving power of the tractor under any working condition is determined. On the basis of the wavelet neural network proportional–integral–derivative algorithm, the control law of the hydromechanical continuous variable transmission speed regulation is designed, and the parameters of proportional–integral–derivative control are corrected in real time during the control process. Based on MATLAB/Simulink modelling and simulation and the real vehicle verification test, results showed that the influence of hydromechanical continuous variable transmission efficiency fluctuation on the driving power of the entire vehicle, the response lag of the pump-controlled motor system, and the effect of the leakage on the variable speed control and the fluctuation of the working resistance are solved by studying the hydromechanical continuous variable transmission variable speed transmission control strategy. This strategy improves the stability of the tractor speed and ensured the quality of the work, thereby improving the ability of the tractor to adapt to complex working environments.

中文翻译：

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拖拉机液压机械无级变速器综合控制策略

针对液压机械无级变速器传动效率波动和响应滞后问题，结合拖拉机复杂多变的工作环境，采用发动机油门补偿-液压机械无级变速器调速一体化控制策略进行双流变速器控制。在估计工作阻力的基础上，采用模糊算法设计油门补偿规律。以拖拉机最大驱动功率为变速控制目标，建立液力机械无级变速传动效率模型，推导出任何工况下拖拉机最大驱动功率下的液力机械无级变速器排量比控制规律决心，决意，决定。在小波神经网络比例-积分-微分算法的基础上，设计了液压机械无级变速器调速控制规律，在控制过程中实时修正比例-积分-微分控制参数。基于MATLAB/Simulink建模仿真和实车验证测试，结果表明，流体力学无级变速器效率波动对整车驱动功率的影响、泵控电机系统的响应滞后，以及影响通过研究流体力学无级变速器变速传动控制策略，解决了变速控制泄漏和工作阻力波动的问题。