Emission legislation limits have tightened in recent years. With regards to the European Union, the new Euro 7 legislation is expected to come into force within 2025. Furthermore, discussions on zero-impact emission levels are ongoing, which in addition are relevant for the assessment of future propulsion systems. In this study, the exhaust aftertreatment system (EAS) of an SI DI 2 l hydrogen engine with dedicated emission control is experimentally evaluated in stationary operation. After that, transient experiments with both low- and high-load RDE driving cycles are conducted. A special focus is put on the heat-up phase of the EAS. Various heat-up measures, including retarded ignition timing, load point shifting and an electrically heated catalyst (EHC) are considered. The 3 kW EHC showed good performance and was further used for the EAS heat-up. The driving cycles are then experimentally conducted with an EAS consisting of an EHC, an SCR catalyst, an ammonia slip catalyst (ASC) and a particulate filter (PF). In the WLTC, NOx tailpipe emissions as low as 1.7 mg/km are achieved, which means a reduction rate of 98 %. In the low- and high-load RDE cycle NOx reduction rates amount to 90 %. Measurement results are assessed towards upcoming Euro 7 emission limits and – in a first approach – towards recently published zeroimpact emission levels. The obtained results underline the potential of a hydrogen engine towards zero-impact emission propulsion technology.
Driving Hydrogen Engines towards a Zero-Impact Emission Level
Proceedings
Internationaler Motorenkongress ; 2024 ; baden-baden, Deutschland April 19, 2024 - April 29, 2024
01.07.2024
21 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Deutsch
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