A SIMPLE AND RELIABLE APPROACH FOR THE DIRECT-INJECTION OF HYDROGEN IN INTERNAL-COMBUSTION ENGINES AT LOW AND MEDIUM PRESSURES

Direct injection of hydrogen in internal combustion engines is being r ecognized as the most appropriate approach to smooth and efficient ope ration. However, control techniques for the direct injection of hydrog en are all built around the idea of spring-loaded puppet valves, contr olled mechanically through rocker arm and camshaft arrangements, or us ing electromagnetic coils. In both approaches, technical difficulties usually arise because of the relatively complicated multi-component ar rangements and because of the excessive temperatures at the top of the cylinder head. To help solve these problems, an assembly comprising a simple hydrogen injector, separated from a simple rotary controller, is introduced in this paper. The hydrogen injector assembly worked in our laboratory, safely and reliably, without the need for springs, coi ls or cams. Nevertheless, if required, any of these components could b e incorporated in a separate controller, away from the high temperatur e cylinder head. In this way, simple electromagnetic or mechanical con trollers could be reliably used.