Modeling the Intake CO ₂ -level during Load Transients on a 1-Cylinder Heavy Duty DI Diesel Engine

For diesel engines the major exhaust problem is particulate matter and NO_x emissions. To reduce NO_x, exhaust gas recirculation (EGR) is often used. The behavior of the EGR-level will therefore influence the emissions and it is therefore valuable to keep track of the EGR-level. Especially during transients it is difficult to predict how the EGR-level varies.

In this paper the CO₂-level in the intake is modeled on a 1-cylinder diesel engine to predict the in cylinder behavior during transients. The model is based on simple thermodynamics together with the ideal gas law. Using this, the model is validated by experimental data during transients and the correlation between model and experiment is shown to be strong. Furthermore, the total tank volume is decreased to achieve a faster mixing with the intention of simulating the behavior of the CO₂-level in a full-size engine which has a higher gas flow.