The TCG 7.8 H2 – Further Development Steps to Realize a CO₂ Free-Powertrain for NRMM

Abstract

The development of a hydrogen internal combustion engine (HICE) represents special challenges in combustion development. The HICE is being developed with external mixture formation and injection of hydrogen upstream of the intake valves. The paper presents simulation results to show the challenges for the hydrogen injection (H₂-injection) system to avoid backfire into the air tract. The achievable engine performance and emission behavior of the PFI-engine are significantly influenced by the turbocharging technology and its ability to rise charge pressure to necessary level. The maximum achievable engine power is optimized by simulating the complete system. The permissible operating conditions are respected to avoid overloading the components. In NRMM applications in particular, the high engine dynamics required (load step) must be considered. Experience in real-world applications enables the suitability of the HICE to be evaluated. It can also be used to evaluate the robustness of the engine concept. For this purpose, several demonstrator projects with different applications are being realized, which are also briefly presented in this paper.