Method for diagnosing deviation of air-fuel ratio between cylinders
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorDong-Hoon Lee
Life of this patent
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Abstract
A method for diagnosing deviation of an air-fuel ratio between cylinders using an oxygen sensor roughness, the method may include a diagnosis condition determination step, an oxygen sensor roughness determination activation step, an oxygen sensor roughness level determination step, an air-fuel ratio deviation detection step, and a failure reporting step.
Claims19
A method for diagnosing a deviation of an air-fuel ratio between cylinders using an oxygen sensor roughness, the method comprising:
- a diagnosis condition determination step of determining, by a controller, whether a diagnosis condition is satisfied;
- an oxygen sensor roughness determination activation step of activating, by the controller, determination of the oxygen sensor roughness when the diagnosis condition is satisfied;
- an oxygen sensor roughness level determination step of determining, by the controller, a level of the oxygen sensor roughness;
- an air-fuel ratio deviation detection step of determining, by the controller, deviation of the air-fuel ratio;
- and
- a failure reporting step of reporting of a failure.
A method for diagnosing deviation of an air-fuel ratio between cylinders using an oxygen sensor roughness, wherein the deviation of the air-fuel ration between the cylinders is diagnosed by a level of the oxygen sensor roughness in a predetermined engine operation region.
A method for diagnosing deviation of an air-fuel ratio between cylinders using an oxygen sensor roughness, wherein the deviation of the air-fuel ration between the cylinders is diagnosed by a change amount of the oxygen sensor roughness generated when performing a fuel amount modulation in a lean direction for each of the cylinders.
Dependencies are inferred from the claim text.