Patent ID: 9702312
Date: 2017-07-11
CPC Classifications: F02B,F02D,F02M

Claim:
1. A process of controlling a fuel and air mixture supplied to an operating engine with an electronic controller with a memory comprising the steps of: a) determining a first engine speed before enleaning the fuel and air mixture supplied to the engine for a first number of engine revolutions; b) enleaning the fuel and air mixture delivered to the engine for a second number of engine revolutions; c) determining a second engine speed for a third number of engine revolutions near, at or just after the end of the second number of engine revolutions; d) after ending the enleaning and after a recovery period, determining a third engine speed; e) if the third engine speed and the first engine speed are not significantly different, determining the difference between the first engine speed and the second engine speed; f) if such speed difference is less than a minimum speed threshold enleaning the fuel and air mixture or if such speed difference is greater than a maximum speed threshold enriching the fuel and air mixture; g) repeating steps a) through f) at least until the difference between the first and second engine speeds is within the thresholds; and h) repeating steps a) through g) multiple times during a period of engine operation.