HAJI Operation in a Hydrogen-Only Mode for Emission Control at Cold Start
950412
02/01/1995
- Event
- Content
- 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.
- Pages
- 6
- Citation
- 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.