The hydrogen assisted jet ignition system (HAJI) replaces the spark plug of an Otto cycle engine and consists of a very small pre-chamber into which a hydrogen injector and spark plug are installed. The HAJI system allows stable combustion of very lean main-chamber hydrocarbon mixtures, leading to improved thermal efficiency and very much reduced NOx emissions.The current investigation focuses on the application of HAJI to a modern pent-roof, four valve per cylinder automotive engine. The development of a new hydrogen injection system and HAJI pre-chamber based on proprietary gasoline and diesel injectors is described. Results from injector and engine performance testing are presented in detail.
Development of the HAJI System for a Multi-Cylinder Spark Ignition Engine
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1996
1996-05-01
Conference paper
English
99091 Modelling the flame enhancement of a HAJI equipped spark ignition engine
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