High Efficiency HD Hydrogen Combustion Engines: Improvement Potentials for Future Regulations
2022-01-0570
03/29/2022
- Event
- Content
- Hydrogen engines offer the possibility of a carbon neutral transportation – a focal point of current propulsion development activities especially for EU and US future concepts. From today's point of view, hydrogen can play an important role in this regard as it is a carbon-free fuel, no CO2 emissions are produced during its combustion process. Besides, it can be well used for lean burn combustion leading to very low NOx emissions, a key benefit in combination with an optimized after-treatment system for future ultra-low NOx legislations of heavy-duty (HD) engines. Comprehensive investigations using single-cylinder tests and model-based development approach are performed aiming the definition of a high efficiency hydrogen engine concept. An optimization regarding compression ratio and engine calibration (regarding AFR, EGR rates and optimal combustion phase) is carried out while considering knocking. In a next step, efficiency improvements potentials resulting from the turbocharger group and advanced thermal management for future EURO VII and US ultra-low NOx regulation are investigated and the achievable BSFC improvement quantified. Furthermore, an overview of the differences in hydrogen port fuel injection (PFI), and direct injection concepts are also described and the changes on brake thermal efficiency as well as achievable engine loads discussed. Using the holistic engine and after-treatment optimization approach, future high-efficiency HD hydrogen engine concepts are evaluated and new technologies for future HD applications are discussed.
- Citation
- Rezaei, R., Kovacs, D., Hayduk, C., and Delebinski, T., "High Efficiency HD Hydrogen Combustion Engines: Improvement Potentials for Future Regulations," SAE Technical Paper 2022-01-0570, 2022, .