Modelling of the exhaust gas recirculation rate based on the in-cylinder pressure measurement for a passenger car diesel engine

This paper proposes a modelling of the exhaust gas recirculation rate using the in-cylinder pressure sensor for a passenger car diesel engine. Traditional modelling approaches for the exhaust gas recirculation rate normally use variables which are measured for a long intake-exhaust air path so that a time delay is inevitable. In addition, the model structure is complex, since many non-linear or unmeasurable variables such as the volumetric efficiency and the efficiency of the exhaust gas recirculation cooler have to be considered in the model. The proposed exhaust gas recirculation rate model is based on the in-cylinder pressure measurement which provides instantaneous information about combustion. Therefore, when this information is used, it is able to model the exhaust gas recirculation rate with a fast response compared with traditional modelling approaches. Furthermore, the proposed model can have a simple model structure since the model does not require consideration of the non-linear or unmeasurable parameters of the air path. The proposed exhaust gas recirculation rate model was integrated into an engine control unit and validated through engine experiments on various operating conditions.The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This research was financially supported by the BK21 plus program (grant number 22A20130000045) under the Ministry of Education in the Republic of Korea together with the National Research Foundation of Korea grant funded by the Korean Ministry of Education, Science and Technology (grant number 2011-0017495). In addition, the research was financially supported by the Industrial Strategic Technology Development Programs (grant numbers 10039673 and 10042633) of the Ministry of Knowledge Economy. Finally, this work was supported through the Energy Resource Research and Development Program (grant number 2006ETR11P091C) under the Ministry of Knowledge Economy in the Republic of Korea