Abstract
To meet future challenges from climate change, CO2 savings in the mobile sector are absolutely essential. The use of an internal combustion engine as an energy converter for green hydrogen into mechanical energy is one possibility for this. During the combustion of hydrogen in the engine, nitrogen oxides are the significantly relevant pollutant component, the emission of NOx strongly depends on the operating strategy. With lean-burn combustion processes, lowest nitrogen oxide emissions can be achieved with excellent efficiencies at steady-state operating points. The challenge lies in optimizing the operating strategy for transient operation in order to achieve excellent emissions here as well.
Extensive experimental investigations were carried out to develop a transient operating strategy for lean-burn processes, basing on previous findings on the emission behavior of hydrogen engines. The high boost pressures required for the lean air fuel ratios pose a challenge in the interaction between dynamics and pollutant emissions. To ensure sufficient dynamics while meeting emission requirements, three measures were investigated in more detail.
Using newly developed or adapted ECU software that makes use of various elements from gasoline and diesel engine control systems, investigations were carried out on the engine test bench with regard to transient behavior. By applying acceleration enrichment, ignition retardation and post-injection in an emulated WLTC, raw emission values below the proposed Euro 7 tailpipe limits were achieved. Significant NOx reductions can also be achieved by means of water injection. In addition, the use of an electrically driven compressor (e-charger) offers further potential, especially for very dynamic load requirements.
Extensive experimental investigations were carried out to develop a transient operating strategy for lean-burn processes, basing on previous findings on the emission behavior of hydrogen engines. The high boost pressures required for the lean air fuel ratios pose a challenge in the interaction between dynamics and pollutant emissions. To ensure sufficient dynamics while meeting emission requirements, three measures were investigated in more detail.
Using newly developed or adapted ECU software that makes use of various elements from gasoline and diesel engine control systems, investigations were carried out on the engine test bench with regard to transient behavior. By applying acceleration enrichment, ignition retardation and post-injection in an emulated WLTC, raw emission values below the proposed Euro 7 tailpipe limits were achieved. Significant NOx reductions can also be achieved by means of water injection. In addition, the use of an electrically driven compressor (e-charger) offers further potential, especially for very dynamic load requirements.
Translated title of the contribution | Transienter Betrieb von Wasserstoffmotoren |
---|---|
Original language | English |
Title of host publication | Proceedings of the International Vienna Motor Symposium 2023 |
Editors | Bernhard Geringer |
Place of Publication | Wien |
Publisher | Österreichischer Verein für Kraftfahrzeugtechnik |
Pages | 867-877 |
Number of pages | 11 |
Volume | 2 |
ISBN (Print) | 978-3-9504969-2-5 |
Publication status | Published - 26 Apr 2023 |
Event | 44th International Vienna Motor Symposium - Vienna, Wien, Austria Duration: 26 Apr 2023 → 28 Apr 2023 https://wiener-motorensymposium.at/en/ https://wiener-motorensymposium.at/ |
Conference
Conference | 44th International Vienna Motor Symposium |
---|---|
Country/Territory | Austria |
City | Wien |
Period | 26/04/23 → 28/04/23 |
Internet address |
Keywords
- Hydrogen engine
- Transient operation
- NOx reduction
Fields of Expertise
- Mobility & Production