Electronic Fuel Injection for Two-Stroke Cycle Gasoline Engines

A new method for direct cylinder injection for two-stroke cycle engines is described. The technique utilizes simple hole type nozzles, accumulator injectors, medium pressure (100 bar), pressure metering, and full electronic controls. The objectives of the system are to accomplish, in a single injection, the four essentials of effective fuel injection (a) metered quantity of fuel, (b) desired spatial distribution, (c) timing of injection, (d) complete vaporization prior to the start of combustion.

Special techniques such as “cloud-stratified charge” and “skip-fire” are discussed as well as the special design features of the components and control systems. Data presented include details of spray formation and engine performance with dramatic reduction in fuel consumption and exhaust emissions.