The high-pressure common rail system has been widely used owing to its precise control of fuel injection rate profile, which plays a decisive role in cylinder combustion, atomization, and emission. The fuel injection rate profile of high-pressure common rail system was studied, and a fuel injection rate profile calculation model is proposed. The model treats the injector as a black box. Some measured data are needed to calculate the parameters in the model. The rise and fall of injection rate is regarded as trigonometric function to reduce the complexity and increase the accuracy. The model was verified using two different types of fuel injectors. The model calculation results were evaluated under various data input conditions. The results show that the model has good applicability to different input data and injectors. In addition, because the model building requires a large amount of experimental data, a comprehensive analysis of various input data was also conducted. The injection profile was analyzed from a new perspective and the regularity of injection rate profile was established.

高压共轨系统因其对喷油量曲线的精确控制而得到广泛应用，这对气缸燃烧、雾化和排放起着决定性作用。对高压共轨系统喷油率曲线进行了研究，提出了喷油率曲线计算模型。该模型将喷射器视为黑匣子。需要一些测量数据来计算模型中的参数。将注射速率的上升和下降视为三角函数，以降低复杂度并提高精度。使用两种不同类型的喷油器对该模型进行了验证。在各种数据输入条件下评估模型计算结果。结果表明，该模型对于不同的输入数据和喷油器具有良好的适用性。此外，由于模型的建立需要大量的实验数据，因此还对各种输入数据进行了综合分析。从新的角度分析注入剖面，建立注入速率剖面的规律性。