This paper studies the problem of the constant pressure control for high pressure tubing. The main factors affecting the pressure change in high pressure oil pipe are the opening time of check valve and the cam angular velocity. Based on the theory of fluid mechanics, ordinary differential equation and Fourier series, the flow-pressure model and pressure-cam angular velocity model are established, respectively. Furthermore, the above model is extended to the case of multiple nozzles. These three models accurately express the functional relationship between the fuel flow rate, the pressure in the tubing and the cam angular velocity. According to the established models, the pressure in the high-pressure oil pipe can be accurately controlled by adjusting some parameters. Finally, a simulation example is given to verify the effectiveness of the proposed method.

本文研究了高压油管的恒压控制问题。影响高压油管压力变化的主要因素是止回阀开启时间和凸轮角速度。基于流体力学理论、常微分方程和傅里叶级数，分别建立了流量-压力模型和压力-凸轮角速度模型。此外，上述模型被扩展到多个喷嘴的情况。这三个模型准确地表达了燃油流量、油管压力和凸轮角速度之间的函数关系。根据建立的模型，可以通过调整一些参数来精确控制高压油管内的压力。最后，