REAL-TIME CALCULATION OF THE NITRIC OXIDE FORMATION AS AN ADD-ON FOR A ZERO-DIMENSIONAL MODEL OF THE DIESEL COMBUSTION

In this paper an approach is presented, to calculate the nitric oxide exhaust of the diesel combustion. To be able to use the model in HIL-simulations, it must be executed in real-time on special hardware. Therefore the model was developed as an enhancement for a zero-dimensional model of the diesel combustion, which is already used for a HIL-test-bench. After a description of the diesel combustion-model, the calculation of the nitric oxide formation is presented, which is divided into three parts. First, the temperature of the hot combustion zone must be calculated, because the average in-cylinder temperature of the zero-dimensional model is not adequate as input data for the subsequent parts. With the temperature of the hot combustion zone, the equilibrium of the combustion products can be solved. The concentration of these species are finally used for the calculation of the nitric oxide formation by the well-known Zeldovich-mechanism.