并联油液型混合动力挖掘机发动机转速控制方法  

Engine Speed Control Method of Parallel Hydraulic Hybrid Excavator

作　　者：来晓靓[1] 管成[1] 肖扬[1] 仲光旭 

机构地区：[1]浙江大学机械设计研究所,杭州310027 [2]山重建机有限公司第二研究院,济宁272000

出　　处：《农业机械学报》2014年第1期14-20,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家高技术研究发展计划(863计划)资助项目(2010AA044401)

摘　　要：通过对并联式油液混合动力挖掘机的原理和结构分析,提出一种改进的油液混合动力结构方案。采用双向液压马达代替二次调节泵,通过不同开关阀组合控制辅助动力系统回路。利用Simulink对该系统建模后,获取相应元器件尺寸参数及控制参数。采用双转速工作点切换的控制策略,在改装后的油液型混合动力挖掘机上进行实验。实验中利用整合负载预测的发动机转速PID控制方法对发动机目标转速、辅助油液动力系统输出扭矩进行调节。仿真和实验分析表明,该发动机转速控制方法可以有效改善油液型混合动力系统中发动机转速波动,使之稳定在高效燃油区域内,综合节能效果提高14%。By analysis on the principle and structure of the parallel hydraulic hybrid excavator, an improved hydraulic hybrid scheme was proposed which uses a two-way hydraulic motor to replace the hydraulic secondary regulation pump and controls the assistant power loop by switching valve in different states. After modeling the new system with Simulink software, the parameters of the components and control method were determined. The double speed points control strategy was test on the improved parallel hydraulic hybrid excavator. The engine speed and the output torque of the assistant hydraulic power system were adjusted by an engine speed P＇ID control method integrated with the load forecasting. The simulation and experiment results showed that the control method could effectively improve the engine speed fluctuation in the hydraulic hybrid system, and make the speed stable near the target speed, so energy-saving increases by 14%.

关 键 词：挖掘机 油液混合动力 双转速工作点 负载预测PID控制 

分 类 号：TH137[机械工程—机械制造及自动化] TD422.2[矿业工程—矿山机电]