Abstract: There is provided an electrically activated, multiple orifice rotary fuel injector for injecting gaseous fuel into an internal combustion engine. A rotary electric stepper motor is housed within an injector body which receives both air and compressed gaseous fuel. The stepper motor rotates an annular valve member to selectively permit or block fuel flow into the air stream through a plurality of circumferentially arranged holes in the valve member, and a correspondingly arranged plurality of passages in the injector body. An electronic control module on the engine utilizes pulse-width-height-triggering point modulation techniques for controlling fuel injection intervals and timing.

Abstract: An improved fuel ignition system for a compression-ignited engine having a fuel combustion chamber and a glow plug located therein. The glow plug has a resistance heating element that is positioned in the combustion chamber. The resistance of the resistance heating element is sensed and compared with a set value. The result is utilized for the purpose of either varying the power supply to the glow plug or determining the length of on and off time for the glow plug while the engine is running.