基于微分方程与最小二乘拟合的高压油管的压力控制

Pressure Control of High-PressureTubing based on Differential Equation and Least Square Fitting

高压油管是燃油发动机的重要组成部分。通过控制高压油管进出燃油产生的压力变化,使其压力变化稳定是提升燃油发动机工作效率的重要手段。本文从高压油管压力控制角度进行研究,分析高压油泵和喷油嘴的工作过程,综合考虑压力、时间等约束条件,建立各因素间的微分方程与优化模型,对高压油泵、喷油嘴与减压阀的工作策略进行了设计。结合喷油嘴工作策略与喷油速率建立方程,对喷油嘴喷油量Mout的数值进行了求解;本文假设使增压时间内泵入油量与喷出油量之差与内部燃油增量Mrise相等,建立微分方程,最终求解出增压不同时间下的阀门开启策略。

High-pressure fuel pipes are an important part of fuel engines. Controlling the pressure change caused by the high-pressure fuel pipe in and out of the fuel to stabilize the pressure change is an important means to improve the working efficiency of the fuel engine. This paper studies from the perspective of high-pressure oil pipe pressure control and analyzes the working process of high-pressure oil pumps and injectors. This article comprehensively considers constraints such as pressure and time. This paper establishes differential equations and optimization models among various factors, and analyzes high-pressure oil pumps, injectors, and reducers. The working strategy of the pressure valve is designed. Combining the working strategy of the injector and the injection rate to establish an equation, the value of the injection amount Mout of the injector is solved. This article assumes that the difference between the pumped and injected fuel volume during the boost time and the internal fuel increase Mrise is equal, the differential equation is es-tablished, and finally the valve opening strategy under different pressures is solved.