All Clean Gasoline Hybrid Powertrains – Real Driving Emissions, Lambda = 1 & Euro 7

Autoren

Dr.-Ing. Johannes Scharf, Dr.-Ing. Matthias Thewes, Dr.-Ing. Andreas Balazs, Dr.-Ing. Michael Görgen, Dr.-Ing. Marius Böhmer, Surya Kiran Yadla, MSc, Dipl.-Ing. (FH) Stefan Lückenbach, Dr.-Ing. Friedrich-Wilhelm Speckens, Matthieu Doucet, MSc, FEV Europe GmbH, Aachen;
Daniel Guse, MSc, Lehrstuhl für Verbrennungskraftmaschinen (VKA), RWTH Aachen University, Aachen

Zusammenfassung

The progression of emission legislation in Europe and China increased the engagement of the automotive industry in the development of improved exhaust gas aftertreatment and combustion systems. The fulfillment of particle number (PN) and
nitrogen oxides (NOₓ) targets in real world driving scenarios have led to the introduction of gasoline particulate filters (GPF) and enlarged catalytic converters. Now on top of these major upgrades, the monitoring of carbon monoxide (CO) emissions according to RDE legislation (Real Driving Emissions) as well as recent regulations on auxiliary emission strategies put high load fuel enrichment for component protection into focus and a ban of enrichment is widely expected. Hence, gasoline engine technologies which enable Lambda = 1 operation in the entire engine map are specifically promoted.
Before this background, this paper presents stoichiometric component protection technology packages and operational strategies for ultra-low PN and CO emissions in all real driving scenarios for hybrid powertrains. Solutions from control functions to new base engine technologies like water injection are assessed. Favorable combinations are identified considering realistic integration in current running series vehicle programs, taking into account the main stream electrification and hybridization approaches of gasoline powertrains.

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