Abstract
Most of the recent clean diesel engines are generally equipped with exhaust gas recirculation (EGR) technology in order to meet the strict criteria of NOx emission regulations. In the field of emission control, accurate and fast transient EGR ratio operation is becoming very critical. In this study, a transient EGR analyzer has been developed and evaluated to confirm the advantage of the transient EGR analyzer by comparing it to a conventional exhaust gas analyzer system. A faster response has been observed from the transient EGR analyzer without significant transient error during transient test cycles. Furthermore, there was a high correlation between the EGR valve behavior implemented and the EGR ratio measured by the transient EGR analyzer. These results show the advantages of the transient EGR analyzer when measuring the EGR ratio during the transient cycle. Additionally, using the response time of measured actual exhaust gas, the gas transition time of the engine EGR system was obtained by z-transformation.
