高压油管的压力优化控制与仿真研究

Simulation Research on the Optimal Pressure Controlfor High-Pressure Oil Fuel Pipeline

凸轮角速度控制是维持高压油管压力稳定的关键因素之一,为了使高压油管的压力具有较小波动,对高压油管的燃油注入和喷出两个工作过程进行了分析.根据凸轮运动方程,运用流体动力学方法获取柱塞腔与高压油管内部燃油的压力与密度的动态变化过程,通过建立凸轮转动角速度的优化数学模型,采用Matlab数值求解得出最优凸轮转动角速度.数值结果表明,可以使高压油管在工作过程中保持压力的稳定,压力变化的最大幅度为4.87 MPa,此研究方法可为高压共轨电控燃油喷射系统的优化设计提供有益的参考.

The control of angular velocity of the cam is one of the key factors to maintain the stability of the pressure of the high-pressure fuel pipeline.In order to provide reference for optimal pressure control of the high-pressure common rail fuel system of the diesel engine,its oil fuel filling and injection are analyzed to reduce the fluctuation of the pressure within it.The course of dynamic change in pressure and density of oil fuel inside the plunger cavity and the high-pressure pipeline is analyzed with the methods of fluid mechanics.Then,an optimal model for angular velocity of the cam is established.Matlab is used to seek the optimal angular velocity of the cam,and the results show that the pressure of the high-pressure pipeline can be stable during the operation of the fuel-injection system where the maximum amplitude value of pressure control is no higher than 4.87 MPa.