Evaporative system leak detection upon refueling
First Claim
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1. A loose or missing fuel cap detection method for an evaporative emission control system of an automotive vehicle, the method comprising:
- running a fuel level change diagnostic to determine if a refueling event occurred;
determining if one or more cold start conditions are met;
running one or more leak tests on the system to determine if one or more leaks is present; and
storing data that is indicative of a loose or missing fuel cap if the one or more leaks is present and the refueling event occurred.
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Abstract
A loose or missing fuel cap detection method for an evaporative emission control system of an automotive vehicle detects a loose or missing fuel cap based in part on whether fuel level changed. The method determines whether the fuel level changed, which is indicative of a refueling event. The method then determines if one or more leaks are present. If the fuel level changed and one or more leaks are present, the method determines that the fuel cap is loose or missing.
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Citations
11 Claims
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1. A loose or missing fuel cap detection method for an evaporative emission control system of an automotive vehicle, the method comprising:
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running a fuel level change diagnostic to determine if a refueling event occurred; determining if one or more cold start conditions are met; running one or more leak tests on the system to determine if one or more leaks is present; and storing data that is indicative of a loose or missing fuel cap if the one or more leaks is present and the refueling event occurred. - View Dependent Claims (2, 3)
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4. A fuel level change detection method for an automotive vehicle, the method comprising:
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shutting off an engine of the automotive vehicle; storing an initial fuel level that is indicative of a fuel level in a fuel tank of the automotive vehicle; turning on the engine; delaying for a first period; determining a current fuel level; calculating a fuel level change based on the initial fuel level and the current fuel level; determining if the fuel level change is greater than or equal to a fuel change threshold; and storing data that indicates that a refueling event occured if the fuel level change is greater than or equal to the fuel change threshold. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification