轨压波动非线性预测模型研究  

Research on Nonlinear Prediction Model for Rail Pressure Fluctuation

作　　者：白云 刘世超 杜成达 杨恒晨 孙强 窦伟 BAI Yun;LIU Shichao;DU Chengda;YANG Hengchen;SUN Qiang;DOU Wei(School of Mechanical Engineering,Yanshan University,Qinhuangdao Hebei 066004,China)

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《佳木斯大学学报（自然科学版）》2024年第3期165-168,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：国家自然科学基金面上项目(52271334);河北省重型机械流体动力传输与控制实验室开放基金资助项目。

摘　　要：轨压波动是由高压油泵连续脉动供油和喷油器间歇喷射导致系统内燃油受到周期性激励而引起的响应。分析了共轨管内压力波动的产生机理,基于燃油非定常流动的连续方程和动量方程导出了表征轨压波动的双曲型偏微分方程,通过数值差分方法离散偏微分方程而得到系统状态矩阵,以油泵供油压力变化率和喷油器喷油压力变化率作为系统输入变量,共轨管不同位置压力波动作为系统输出变量,以状态空间方法分析了系统压力波动特性。将计算结果与实验测量数据进行对比,结果表明所建立的非线性数值模型能准确表征轨压波动特性。Rail pressure fluctuation is a response caused by periodic excitation of the fuel in the system caused by continuous pulsating fuel supply from the high-pressure oil pump and intermittent injection from the fuel injector.The generation mechanism of pressure fluctuation in the common rail pipe is analyzed.Based on the continuity equation and momentum equation of unsteady fuel flow,the hyperbolic partial differential equation characterizing the rail pressure fluctuation is derived.The system state matrix is obtained by discretizing the partial differential equation through numerical difference method.The change rate of fuel pump supply pressure and injector injection pressure is taken as the system input variable,and the pressure fluctuation at different positions of the common rail pipe is taken as the system output variable.The pressure fluctuation characteristics of the system were analyzed using the state space method.Comparing the calculation results with experimental measurement data,the results indicate that the established nonlinear numerical model can accurately characterize the characteristics of rail pressure fluctuations.

关 键 词：共轨 轨压 非线性 预测模型 

分 类 号：TK421.4[动力工程及工程热物理—动力机械及工程]