Abstract: An air-fuel optimization logic for an electronic engine control system for optimizing the efficiency of a heat engine. The engine control system has a governor generating fuel command signals to maintain speed of the engine at a desired speed, means for generating a reference air-fuel ratio signal, means responsive to the fuel command signal and the air-fuel ratio signal for supplying air to the engine, and means responsive to the fuel command signal for supplying fuel to the engine. The air-fuel optimization logic has means responsive to a change in the fuel command signal to generate an optimized air-fuel ratio offset signal which when summed with the a reference air-fuel ratio signal produces an optimized air-fuel ratio signal. The air-fuel optimization logic increments the reference air-fuel ratio signal to find a lean offset and decrements the reference air-fuel ratio signal to find a rich offset. The lean and rich offsets are averaged to generate the optimized air-fuel ratio offset.

Abstract: A pro-active engine control system for a rotary engine having a governor generating a fuel command signal determined to maintain the actual engine speed at a setpoint speed. A fuel logic circuit converts the fuel command signal to a flow rate signal actuating a fuel delivery device to supply fuel to the engine at a rate required to maintain the speed of the engine at the setpoint speed. The fuel command signal is multiplied by a desired air-fuel ratio to generate an air command signal. An air logic circuit converts the air command signal to air rate signals activating an air delivery device to deliver air to the engine at a rate such that the ratio of air-to-fuel delivered to the engine has the desired air-fuel ratio.