Modeling the impact of early exhaust valve opening on exhaust aftertreatment thermal management and efficiency for compression ignition engines

摘要: In response to strict emissions regulations, engine manufacturers have implemented aftertreatment technologies reduce the tailpipe from diesel engines. The effectiveness of most these systems is limited when exhaust temperatures are below 250°C. This problematic during cold start and at low-load operation gas temperature too low keep working effectively. implementation variable valve actuation strategies, including early opening, has been proposed as a means elevate temperatures. Early opening results in hotter gas; however, more fueling needed maintain brake power output. article outlines an analysis impact on (measured turbine outlet) required fueling. An experimentally validated model developed, which relates increase with timing opening. used generate...