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Development of the HAJI System for a Multi-Cylinder Spark Ignition Engine
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Abstract
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.
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Glasson, N., Lumsden, G., Dingli, R., and Watson, H., "Development of the HAJI System for a Multi-Cylinder Spark Ignition Engine," SAE Technical Paper 961104, 1996, https://doi.org/10.4271/961104.Also In
References
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