Method and means for controlling air-to-fuel ratio

Details Method and means for controlling air-to-fuel ratio Method and means for controlling air-to-fuel ratio

F - Mech Eng,Light,Heat,Weapons

02

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341/38.13

F02D 29/00 (2006.01) F02D 28/00 (2006.01) F02D 41/14 (2006.01)

Patent

CA 1183238

Abstract of the Disclosure A method for controlling the air-to-fuel ratio fed to an engine or other combustion device provides for periodically adjusting the air-to-fuel ratio to stoichiometric or near stoichiometric, within the response range of the conventional exhaust gas sensor employed. This establishes a reference point from which the setting of an air-to-fuel ratio propor- tioning device (e.g., carburetor) is established by moving its adjustment means a selected distance from its setting at the reference point. The selected value may be outside the normal response range of the sensor, either rich or lean of stoichio- metric. The apparatus may include a sensor which generates an output signal which is compared against a reference signal by a comparator. When the output signal exceeds (or falls below) the reference signal, a timer to operate the proportioning device adjustment means in the desired direction for a stated interval of time is actuated. A separate timer operates the adjustment means towards stoichiometric at selected intervals to periodically establish the reference point.

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