Prediction model of injection quantity of high pressure common rail fuel system

Abstract

ObjectivesIn order to provide the basis for accurate control of diesel engine fuel injection quantity, a method was proposed to establish the main injection quantity prediction model with input parameters as dwell time, common rail pressure and main injection pulse width for the pre-main injection mode.MethodsAMESim simulation model was used to conduct simulation experiments and then collect data. Based on the data, the relationship between the dwell time and the main injection volume under single working condition was obtained. On this basis, the influence of common rail pressure and main injection pulse width on the model coefficient was introduced to build a complete multi-working condition main injection quantity prediction model. Multiple input parameter combinations were used to verify the accuracy and reliability of the prediction model of main injection quantity fluctuation.ResultsThe results show that the root-mean-square error (RMSE) of the scheme of multi-working condition main injection quantity prediction model is 1.443 mm3. It can reduce the experiment amount required for modeling from n3 orders of magnitude to n2 orders of magnitude.ConclusionsThe proposed prediction model has sufficient accuracy, which is of great significance for engineering application of model-based fuel injection control.

Keywords

• marine diesel engine
• high pressure common rail system
• main injection quantity
• fuel injection quantity fluctuation
• multi-working condition
• prediction model