Variable Valve Train for Modern Diesel Engines
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Active exhaust temperature management is a key technology of modern diesel engines to fulfill upcoming RDE emission legislation requirements. IAV and Schaeffler present a fuel efficient concept using a switchable valve train system.
Introduction and Motivation
Stricter NOx emission targets in RDE legislation and the reduction in CO2 fleet target values by 2025 require new technologies for gasoline and diesel engines. With diesel engines, exhaust gas aftertreatment plays a key part in meeting the NOx target values. In this context, the central challenges lie in heating up the catalysts after starting the engine at optimum CO2 emission and in preventing exhaust system cool down in low load driving profiles .
State of the art are various heating modes which cause fuel consumption to increase. Internal EGR (iEGR) by means of Secondary Exhaust Valve Lift (SEVL) is known as a measure for increasing exhaust gas temperature while keeping the increase in fuel consumption relatively low [2,...