Impact of variable valve timing on power, emissions and backfire of a bi-fuel hydrogen/gasoline engine

摘要: Hydrogen-fueled internal combustion engines are a possible solution to make transportation more ecological. Apart from difficulties in production and storage of hydrogen, there three major bottlenecks the operation hydrogen-powered engines: reaching high power output, reducing NOx emissions at loads avoiding backfire. This paper presents an experimental study influence continuously variable valve timing intake valves on these bottlenecks. Measurements were performed four-cylinder engine that can run gasoline as well hydrogen. The measurements hydrogen compared those gasoline. For effects cam phasing investigated wide open throttle, where load is controlled by quality mixture (equivalence ratio) throttled mode, defined quantity mixture. Results show it optimize applied control strategy using means increase range both qualitative quantitative methods, which contributes easier switch between methods.