Ethanol content rationality for a flexible fueled vehicle
First Claim
1. A method for checking the accuracy of a determined alcohol content of fuel for a flexible fueled vehicle, comprising:
- calculating at least two alcohol concentration possibilities based on at least two possible fuel types wherein the at least two possible fuel types have different alcohol concentrations;
calculating thresholds for the at least two alcohol concentration possibilities;
comparing the determined alcohol content to the thresholds; and
assuming an error in the determined alcohol content of the flexible fueled vehicle if the determined alcohol content is outside the thresholds.
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Abstract
A method for checking the accuracy of an oxygen sensor based determination of the alcohol content of the fuel of a flexible fueled vehicle. Following the addition of fuel to the flexible fueled vehicle two alcohol concentration possibilities are calculated. The two alcohol concentration possibilities are then used to calculate thresholds for the determining if the oxygen sensor based determination falls within the thresholds. If the oxygen sensor based determination does not fall within the thresholds then action is taken to counteract an inaccurate determination of alcohol concentration.
12 Citations
10 Claims
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1. A method for checking the accuracy of a determined alcohol content of fuel for a flexible fueled vehicle, comprising:
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calculating at least two alcohol concentration possibilities based on at least two possible fuel types wherein the at least two possible fuel types have different alcohol concentrations;
calculating thresholds for the at least two alcohol concentration possibilities;
comparing the determined alcohol content to the thresholds; and
assuming an error in the determined alcohol content of the flexible fueled vehicle if the determined alcohol content is outside the thresholds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for rationalizing a determined fuel blend of a flexible fuel in a fuel tank of a flexible fueled vehicle comprising:
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providing a first fuel blend possibility wherein the first fuel blend possibility comprises at least two fuel components wherein a first component is present in the fuel blend in a greater proportion than a second component;
providing a second fuel blend possibility wherein the second fuel blend possibility comprises the at least two fuel components wherein the first component is present in the second fuel blend possibility in a lesser proportion than the second component;
calculating a first threshold for the first fuel blend possibility;
calculating a second threshold for the second fuel blend possibility;
comparing the determined fuel blend to the first threshold and to the second threshold; and
recognizing an error in the determined fuel blend if the determined fuel blend is greater than the first threshold or less than the second threshold.
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Specification