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AssigneeGM Global Technology Operations LLC
InventorsThomas Wittefeldt, Richard Backman, Erik Sunnegårdh, Staffan Seth
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The air fuel ratio of an engine adapted to run on a mixture of alcohol and gasoline can be adapted by a method wherein the air fuel ratio is controlled using an ethanol adaptation value, including reducing the enrichment factor from an initial value until a lean switch from rich conditions to lean conditions is detected, determining a first enrichment factor value at which the lean switch occurs, increasing the enrichment factor until a rich switch from lean conditions to rich conditions is detected, determining a second enrichment factor value at which the rich switch occurs, calculating the average value between the first enrichment factor value and the second enrichment factor value, adjusting the air fuel ratio using the average value.
A method of adjusting the air fuel ratio of an engine adapted to run on a mixture of alcohol and gasoline, said air fuel ratio being controlled by means of an ethanol adaptation value, the method comprising:
A computer program product stored on a medium and comprising computer readable code which, when run in a processor of an engine control unit for controlling the fuel injection to an engine that can run on a mixture of alcohol and gasoline, said engine control unit receiving a sensor value indicative of rich conditions or lean conditions for the engine and adjusting the air fuel ratio, said air fuel ratio being controlled using an ethanol adaptation value, causes the engine control unit to perform the steps of:
A control unit for controlling the fuel injection to an engine that can run on a mixture of alcohol and gasoline, said control unit inc1uding receiving a sensor value indicative of rich conditions or lean conditions for the engine, and a computer program product stored on a medium and including computer readable code which, when run in a processor of the control unit causes the control unit to perform the steps of:
Dependencies are inferred from the claim text.