举高作业车工作斗独立调平控制系统

An Independent Leveling System for the Baskets of Lift Cars

举高作业车工作斗调平性能的好坏,是保障作业安全、考核车辆工作性能的关键环节。通过分析现有非独立调平系统存在的短板,设计了一套高性能的工作斗独立调平系统。系统采用独立于臂架运动的液压动力源,同时设计了与之配套的闭环电气控制系统。独立的油源有效的解决了油路长、压力波动大造成的响应延时问题。而电控系统采用的前馈控制的变参数PID控制方法,加快了调平油缸的响应速度,同时能够更好的控制误差。整个系统的实时调平过程中,误差有效的控制在1°以内。与原有的非独立调平系统相比,极大的提高了工作斗调平的实时跟随效果。

The leveling performance of the basket of lift cars is a key factor for guaranteeing operation safety and evaluating operational performance of the vehicle. On the basis of an analysis of the weaknesses of current non-independent leveling systems, this paper designs an independent high-performance leveling system for the basket, which uses a hydraulic power source independent of arm movement. Furthermore~ it designs a matched closed-loop electric control system. The independent oil source effectively resolves the problem of response delay due to long oil lines and large pressure fluctuation. Variable parameter PID control combined with feed- forward control in the electronic control system help to raise the response speed of the leveling cylinder and achieve better error control within 1 o throughout real-time leveling of the whole system. Real-time tracking effect of the basket leveling is thus improved greatly as compared with former non-independent leveling systems.