Analysis of the Impact of Early Exhaust Valve Opening and Cylinder Deactivation on Aftertreatment Thermal Management and Efficiency for Compression Ignition Engines

TL;DRAbstract

In order to meet strict emissions regulations, engine manufacturers have implemented aftertreatment technologies which reduce the tailpipe emissions from diesel engines. The effectiveness of most of these systems is limited when exhaust temperatures are low (usually below 200°C to 250°C). This is a problem for extended low load operation, such as idling and during cold start. Use of variable valve actuation, including early exhaust valve opening (EEVO) and cylinder deactivation (CDA), has been proposed as a means to elevate exhaust temperatures. This thesis discusses a research effort focused on EEVO and CDA as potential enablers of exhaust gas temperature increase for aftertreatment thermal management. EEVO results in hotter exhaust gas, however, more fueling is needed to maintain brake power output. The first study outlines an analysis of the impact of EEVO on exhaust temperature (measured at the turbine outlet) and required fueling. An experimentally validated model is developed whi

Chat with Paper

AI Agents for this Paper