摘要
针对高压共轨柴油发动机在全工况范围轨压控制的动态响应和跟随性的需求,通过分析轨压工作原理,提出轨压系统控制策略,设计一种动态分级系数的PID轨压控制算法。该控制算法经过多项改进,包括轨压采集、前馈控制、PID控制和IMV阀驱动等。采用基于模型的设计方法,通过Simulink软件工具对轨压控制算法进行建模。利用代码自动生成技术,将生成的轨压控制算法代码集成到发动机控制器中,开展了发动机台架试验。试验结果表明:该轨压控制算法具有良好的跟随性和响应速度,且轨压控制较为平稳;在稳态工况下,命令轨压与反馈轨压差值在2.0 MPa以内;在动态工况下,命令轨压与反馈轨压差值在3.0 MPa以内。
Aiming at the demand of dynamic response and follow-up of rail pressure control of high pressure common rail diesel engine in the whole operating range,the control strategy of the rail pressure system was proposed by analyzing the rail pressure working principle,and a PID rail pressure control algorithm with dynamic grading coefficient was designed.The control algorithm was improved in many ways,including rail pressure acquisition,feed-forward control,PID control and IMV valve drive.The improved rail pressure control algorithm was modeled by using the model-based design method and Simulink software.The code of the rail pressure control algorithm was integrated into the engine controller by using the automatic code generation technology,and the engine bench test was carried out.The test results show that the rail pressure control algorithm has good following performance and response speed,and the rail pressure control is relatively stable.In steady condition,the difference between the command rail pressure and the feedback rail pressure is less than 2.0 MPa;in dynamic condition,the difference between the command rail pressure and the feedback rail pressure is less than 3.0 MPa.
作者
于正同
陈春梅
时培燕
彭倩迪
YU Zhengtong;CHEN Chunmei;SHI Peiyan;PENG Qiandi(Xi’an Institute of Aeronautical Computing Technology,AVIC,Xi’an Shaanxi 710065,China;Department of Vehicle Engineering,Shandong Transport Vocational College,Weifang Shandong 261206,China;Dongfeng Cummins Engine Co.,Ltd.,Xiangyang Hubei 441004,China)
出处
《机床与液压》
北大核心
2021年第9期131-135,144,共6页
Machine Tool & Hydraulics
基金
工信部预研项目(MJ-2017-D-28)。
关键词
柴油发动机
动态分级系数
前馈控制
轨压控制
闭环控制
Diesel engine
Dynamic classification coefficient
Feed-forward control
Rail pressure control
Closed-loop control
