Neural Network-Based Diesel Engine Emissions Prediction Using In-Cylinder Combustion Pressure 1999-01-1532

This paper explores the feasibility of using in-cylinder pressure-based variables to predict gaseous exhaust emissions levels from a Navistar T444 direct injection diesel engine through the use of neural networks. The networks were trained using in-cylinder pressure derived variables generated at steady state conditions over a wide speed and load test matrix. The networks were then validated on previously “unseen” real-time data obtained from the Federal Test Procedure cycle through the use of a high speed digital signal processor data acquisition system. Once fully trained, the DSP-based system developed in this work allows the real-time prediction of NO_X and CO₂ emissions from this engine on a cycle-by-cycle basis without requiring emissions measurement.