Control of predefined diesel combustion processes by a burn-rate model

Abstract

The interaction between air-path and injection system is of great importance for the future engine control concepts. Currently, some of these interactions like reduction of the injection quantity at the smoke limit are considered. However, a physically-based consideration of the real effects of the intake air states like temperature, pressure, and composition under transient engine operating conditions should be more developed.

In this study, first a phenomenological combustion model for calculation of the burnrate from the given injection pattern is presented. This forward model is a platform for optimization of the burn-rate for different operating conditions and is used in the next step for model inversion. The main idea here is to explicitly invert the sub-models and physical modules of the forward model in order to inversely calculate the required injection rate for realization of the pre-defined burn-rate.

The information about the air-path system, intake air conditions as well the preoptimized burn-rate are directly given to the phenomenological inverted combustion model and this inversely calculates the required injection pattern to realize and control the target combustion process. The developed model is coupled to an engine model and validated against the experimental results.