A device for accurate dynamic air flow control in a hydrogen internal combustion engine

  • Over the last decade, the prevailing demand for renewable energy sources initiated the electrification of the transportation sector, with the development of H2 engines and fuel cell powertrains increasingly gaining momentum alongside battery electric vehicles. One of the essential tasks to optimize the overall efficiency of these drives is to precisely, dynamically and frictionless meter the reacting gases into the conversion chambers. In this paper, we propose a novel dosing system, focusing on gases (air), that is based on the principle of a variable Venturi nozzle, which incorporates a device for rapid variation of the effective flow cross-sectional area (EA) with negligible pressure losses. Each EA corresponds to a demanded load or mass flow and thus enables a dynamic control of the stoichiometry (l) of the machine. Our patented technology mainly consists of two surfaces perpendicular to the flow direction where one is fixed in space and the other one is moving at high frequency (> 20 Hz) towards or against the flow direction.Over the last decade, the prevailing demand for renewable energy sources initiated the electrification of the transportation sector, with the development of H2 engines and fuel cell powertrains increasingly gaining momentum alongside battery electric vehicles. One of the essential tasks to optimize the overall efficiency of these drives is to precisely, dynamically and frictionless meter the reacting gases into the conversion chambers. In this paper, we propose a novel dosing system, focusing on gases (air), that is based on the principle of a variable Venturi nozzle, which incorporates a device for rapid variation of the effective flow cross-sectional area (EA) with negligible pressure losses. Each EA corresponds to a demanded load or mass flow and thus enables a dynamic control of the stoichiometry (l) of the machine. Our patented technology mainly consists of two surfaces perpendicular to the flow direction where one is fixed in space and the other one is moving at high frequency (> 20 Hz) towards or against the flow direction. Firstly, the underlying design philosophy and the details of the first prototype are presented, followed by an extensive description of the test bench setup, including data acquisition system. This is succeeded by a thorough analysis of the high-frequency data to extract flow characteristics and turbulence parameters. Subsequently, the transient performance of the Venturi system is experimentally compared with that of a throttle body. Finally, the capability of the Venturi system to precisely control the cycle-resolved air-fuel ratio of a hydrogen engine is demonstrated through transient simulation results based on a class B car operating under the FTP-75 driving cycle.show moreshow less

Export metadata

Additional Services

Search Google Scholar
Metadaten
Author:Georgios BikasORCiD, Orpheas Bikas, Fabian Großmann, Jonas Oswald, Marius Jochem
DOI:https://doi.org/10.5281/zenodo.15193413
Parent Title (English):CIMAC Congress, Zurich, May 19-23, 2025
Subtitle (English):Controls, Automation, Measurement, Monitoring & Predictive Maintenance
Document Type:conference proceeding (article)
Language:English
Date of first Publication:2025/05/19
Reviewed:Begutachtet/Reviewed
Release Date:2025/06/25
Pagenumber:13
institutes:Institut für Angewandte Wasserstoffforschung, Elektro- und Thermochemische Energiesysteme (H2Ohm)
Institut für Fahrzeugtechnik
Research Themes:Energie & Ressourcen
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
Verstanden ✔
Diese Webseite verwendet technisch erforderliche Session-Cookies. Durch die weitere Nutzung der Webseite stimmen Sie diesem zu. Unsere Datenschutzerklärung finden Sie hier.