基于燃油经济性的采棉机变速箱速比匹配控制策略

Speed Ratio Matching Control Strategy of Transmission of Cotton Picker Based on Fuel Economy

为提高装有自主设计的液压机械无级变速箱的采棉机的燃油经济性,使采棉机发动机在采摘和运输时的两种典型工作情况下均工作在最佳燃油经济性转速调节特性曲线,提出一种基于燃油经济性的发动机-变速箱速比匹配控制策略,速比匹配控制模块用于采集发动机油门踏板开度信号,并计算此发动机油门踏板开度下的发动机最佳燃油经济性转速,然后向变量泵排量比控制模块和换段控制模块发出控制信号,对采棉机液压机械无级变速箱速比进行调节,使发动机转速在调速特性作用下稳定于目标燃油经济性转速。仿真结果表明:在此控制策略下,采棉机发动机实际转速在给定的负载转矩以及发动机油门踏板开度下能够稳定在目标燃油经济性转速附近,为实现装有自主设计的液压机械无级变速箱的采棉机的燃油经济性控制提供理论依据。

The purpose of this study is to improve the fuel economy of the cotton picker equipped with self-designed hydro-mechanical continuously variable transmission,so that the engine of the cotton picker can work in the best fuel economy speed regulation characteristic curve under the two typical working conditions of picking and transportation.A speed ratio matching control strategy based on fuel economy was proposed.The speed ratio matching control module was used to collect the engine accelerator pedal opening signal,the optimum fuel economy speed of the engine under the engine accelerator pedal opening was calculated,and then control signals were sent to the variable pump displacement ratio control module and the shift control module to adjust the speed ratio of the hydro-mechanical continuously variable transmission of the cotton picker,so that the engine speed was stabilized at the target fuel economy speed under the effect of the speed regulation characteristics.The simulation results show that under this control strategy,the actual speed of the cotton picker engine can be stable near the target fuel economy speed under the given load torque and the opening of the engine accelerator pedal.This study provides theoretical basis for the fuel economy control of cotton picker equipped with self-designed hydro-mechanical continuously variable transmission.