Abstract: A direct cylinder injected engine in several different embodiments which are specifically illustrated as two-cycle engines but which can also be used in four-cycle engines. The fuel injector is positioned so as to minimize escape of fuel from the exhaust port in the two-cycle engine applications. In addition, multiple or extended spark plug firing is accomplished under difficult running conditions and wherein fuel vaporization may be incomplete. This will ensure complete combustion. Various control routines and strategies are disclosed that control the number or time of injection depending upon such factors as engine speed, load, speed variation, air fuel ratio variations and pressure variations.

Abstract: An electrical supply and switching circuit for the electrical fuel injectors of a fuel injection engine wherein a separate voltage supply circuit is provided for both the control circuit and driver circuit to minimize the effects of noise.

Abstract: An improved method of operating a two cycle direct injected internal combustion engine so as to provide good ignition and combustion even when operating in a stratified condition. This is achieved either by extending the duration of firing of the spark plug either by extending a single firing or providing multiple firings per cycle or by changing the energy level across the gap of the spark plug during its firing.