Methods and systems are provided for inferring a current operational state of one or more fuel tank grade vent valves. In one example, a method comprises predicting an upcoming fuel slosh event in a fuel tank positioned in a fuel system of a vehicle, and in response to such a prediction, sealing the fuel system within a threshold duration of the upcoming fuel slosh event and diagnosing a grade vent valve as a function of fuel level in the tank at the time of the fuel slosh event and a pressure monitored in the fuel system during the fuel slosh event. In this way, issues related to fuel tank overpressurization and/or release of undesired evaporative emissions to atmosphere may be reduced or avoided.
Systems and methods for fuel tank grade vent valve diagnostics
21.07.2020
Patent
Elektronische Ressource
Englisch
SYSTEMS AND METHODS FOR FUEL TANK GRADE VENT VALVE DIAGNOSTICS
Europäisches Patentamt | 2020
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