混凝土泵车压差感应换向双参数控制技术

Double-parameter control on concrete pumps for pressure-difference-sensed inversion

为克服混凝土泵送系统参数时变和不确定性因素以及负载的突变性,提出了发动机转速和液压泵排量双参数控制策略,提高了控制系统响应的快速性和稳定性.通过现场试验总结出混凝土泵车泵送系统的负载具有周期性和突变性的特点,通过油耗试验发现发动机转速波动对燃油消耗的影响严重.基于系统的动力学方程设计了压差感应换向双参数控制系统,实现了对混凝土泵车发动机转速和液压泵排量的双闭环控制,提高了系统的动态响应速度和稳态控制精度.改进前后的对比试验表明:双参数控制策略相比于传统的单参数分段控制策略具有较优的控制性能和燃油经济性,发动机的转速波动可降低50r·min-1,换向的响应时间和整机效率可提高7%,平均油耗降低5%.

To resolve the parametric variation,uncertainty and loading mutability of concrete pumping systems,a double-parameter control method is proposed in terms of engine rotary speed and hydraulic pump displacement to enhance the response rapidity and stability of control system.Through on-site experiments,the loading is detected with periodic and mutable features.In addition,the rotary speed fluctuation significantly impacts the fuel consumption.By designing the pressure-difference-sensed inversion system via dynamical equations,a double close-loop control is realized to improve dynamic system response and stable state control precision.It is found from the comparative experiments that the proposed strategy,compared with traditional single-parameter sectional control strategy,possesses better control performance and fuel efficiency with speed fluctuation reduction by 50 rpm,response time and machinery efficiency promotion by 7% and fuel consumption reduction by 5%.