This paper presents a new on-line measurement method of injection rate based on the injector inlet pressure. The Riemann wave theory is applied to the fuel system, and the mathematical relationship of injection rate (G) and pressure (P) under single Riemann wave is put forward. The correction algorithm of the interference wave and the decoupling method of the superposition wave are proposed, which improves the accuracy of the algorithm and realizes the calculation of the fuel injection rate during the long injection energizing time. The identification algorithm of the needle maximum upstroke position moment and the needle starting downstroke moment are proposed and taken as the key time characteristics of the injection process. Compared to the experiments, the errors of the injection mass by this method were within 3%, and the fitting goodness of injection rate curve exceeded 0.93, proving quite good precision for the method.

本文提出了一种基于喷射器入口压力的在线喷射率在线测量方法。将黎曼波理论应用到燃油系统中，提出了单一黎曼波下喷射率（G）和压力（P）的数学关系。提出了干扰波的校正算法和叠加波的解耦方法，提高了算法的精度，实现了长喷射通电时间内燃油喷射率的计算。提出了针最大上行程位置力矩和针起始下行程力矩的识别算法，并将其作为注射过程的关键时间特征。与实验相比，该方法的注射质量误差在3％以内，