The optimised mixture formation fro hydrogen fuelled engines

摘要

Both intake port injection type and in-cylinder injection type hydrogen fuel supply systems are designed for a singly-cylinder research engine to investigate the effect of mixture formation on the performance of the hydrogen-fulled engiens. The intake port injection is superior in thermla efficiency and engine operation stability at low load conditions. However, the in-cylinder injection is superior for high load condition. In an engine experiment with throttling condition, the enginewith intake port injection operates more stably and efficiently when fuel-air equivalence ratio is maintained above a cretain level despite the pumping loss dur to stable combustion. Thus, the hydrogen-fuelled engiens can be operated more stably with the in-cylider injection at high load and more efficiently with the intake port injection at low load. Therefore, the optimised operation of the hydrogen-fueelled engiens can be achieved with a dual injection system and throttle valve control.