Abstract The introduction of Real Driving Emission (RDE) legislation requires the review of pollutant emission of vehicles under varying environmental conditions and driving profiles. A specific challenge for light duty Diesel vehicles arises from low load driving profiles under cold environmental temperature conditions and/or reduced ambient air pressure (i.e. operation in altitude). Under such boundary conditions the component temperatures and gas temperatures in the combustion chamber and the exhaust aftertreatment system are reduced which impedes engine out emissioning as well as exhaust gas aftertreatment. To face this challenges innovative engine technologies such as variable valve train actuation (VVA), charge air heater, electrically heated catalysts (eDOC) and also hybridization concepts are under consideration. This paper investigates the potential of valve train variabilities (i.e. variable valve lift) more in detail. Strategies like cylinder deactivation and second exhaust valve lift (SEVL) are evaluated for RDE relevant low load driving conditions based on a 1D GT Power simulation. The coupling with a physical simulation model of the exhaust aftertreatment processes allows not only for the judgment of the impacts on NOX engine-out emissions and fuel consumption but also on tailpipe emissions.
A step towards RDE compliance of LD Diesel engines applying variable valve train
2017-01-01
25 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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