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HAJI Operation in a Hydrogen-Only Mode for Emission Control at Cold Start
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English
Abstract
The HAJI (Hydrogen Assisted Jet Ignition) system for S.I. engines utilises direct injection of small amounts of hydrogen to enhance the combustion of a variety of automotive fuels. Although not the primary purpose of HAJI, the hardware, once in place, also lends itself to the possibility of hydrogen-only running during a cold start. Cold-start simulations have been performed using a single cylinder engine. Results are presented, comparing hydrogen-only tests with standard HAJI operation and normal spark-ignition operation. HAJI and spark ignition tests were carried out with gasoline as the main-chamber fuel. Emission levels and combustion stability characteristics were recorded as the engine warmed up. The differences between the various fueling/ignition scenarios are presented and the implications for possible automotive applications are discussed in light of current and proposed emissions legislation.
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Lumsden, G. and Watson, H., "HAJI Operation in a Hydrogen-Only Mode for Emission Control at Cold Start," SAE Technical Paper 950412, 1995, https://doi.org/10.4271/950412.Also In
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