Abstract

In order to comply with future exhaust emission limits, very precise control of the injection quantity and injection timing is of crucial importance. The injection system fulfilling these requirements in the best way is the common rail system.
The model presented here describes a 1D hydraulic injector model in Simscape, which is coupled to a zerodimensional combustion engine model. Measurements were carried out using an injection rate analyser to validate the injector model. Good results were achieved between simulation and experiment.
In the second step, a model developed in Matlab Simulink was extended with a phenomenological combustion model according to Barba. The injection rate is transferred to the combustion model as an input parameter. This is used to calculate the heat release rate by means of the combustion engine model, taking other sub-models into account. Good agreements were achieved between the heat release rate calculated from the pressure curve analysis and the simulation.