泵阀联合调速在电动叉车中的应用

Application of Combined Pump and Valve Speed Regulation in Electric Forklift

为解决电动叉车液压系统在启动和位置调整时响应速度慢等问题,提出了一种采用泵阀联合调速的解决方案。针对电动叉车工作特点,提出了泵阀联合调速的控制方式,在泵控环节,通过引入模糊控制作为算子函数,实时整定PID参数,从而提高电机在不同工况下的自适应能力;在阀控环节,采用PID控制确保输出流量的稳定性。采用Simulink和AMESim进行仿真,结果表明:采用模糊控制的矢量调速对于不同工况的适应能力有很大提高,而采用阀控则可有效提高系统响应速度。两者结合的泵阀联合调速,不仅克服了单纯变频调速响应滞后的缺点,同时对于复杂工况有很好的适应能力。

In order to solve the problem of slow response speed of the hydraulic system of the electric forklift during starting and position adjustment,a solution using the combined speed regulation of the pump and valve is proposed. Aiming at the working characteristics of electric forklift,the control method of combined pump and valve speed regulation was proposed. In the pump control section,the fuzzy control was introduced as the operator function to adjust the Proportion Integration Differential( PID) parameters in real time,thus improving the self-adaptive ability of the motor under different working conditions. In the valve control link,PID control was used to ensure the stability of the output flow. The simulation results of Simulink and AMESim show that the vector control with fuzzy control can greatly improve the adaptability of different working conditions,and the valve control can effectively improve the system response speed. The combined pump and valve speed regulation not only overcomes the shortcomings of response delay of simple frequency conversion speed regulation,but also has good adaptability to complex working conditions.