Method and device for diagnosing a ventilation line of an internal combustion engine fuel tank
AssigneeVitesco Technologies GmbH
InventorsThomas Pichler, Thomas Koenig
Life of this patent
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Abstract
A method and a device for diagnosing a ventilation line of a motor vehicle are provided. The ventilation line is arranged between a fuel tank and an activated carbon filter. The motor vehicle has a control unit (ECU) and is powered by an internal combustion engine. The state of a vacuum switch is evaluated for the diagnosis.
Claims14
A method for diagnosing a ventilation line of a motor vehicle, the ventilation line arranged between a fuel tank and an activated carbon filter, the motor vehicle including an engine control unit (ECU) and an internal combustion engine powering the motor vehicle, the method comprising:
- evaluating a state of a vacuum switch arranged on a fresh-air side of the activated carbon filter;
- evaluating changes in a fill level of the fuel tank;
- detecting a presence of a functional ventilation line when a change in the fill level is identified and the vacuum switch moves to an open position, and
- detecting a presence of a defective ventilation line when the change in the fill level is identified and the vacuum switch remains in a closed position, the presence of the defective ventilation line indicative of an increase in hydrocarbon emission of the motor vehicle.
A device for diagnosing a ventilation line of a motor vehicle, the ventilation line arranged between a fuel tank and an activated carbon filter, the motor vehicle including an internal combustion engine powering the motor vehicle, the device comprising an engine control unit (ECU) controlling a method, the method comprising:
- evaluating a state of a vacuum switch arranged on a fresh-air side of the activated carbon filter;
- evaluating changes in a fill level of the fuel tank;
- detecting a presence of a functional ventilation line when a change in the fill level is identified and the vacuum switch moves to an open position;
- and
- detecting a presence of a defective ventilation line when the change in the fill level is identified and the vacuum switch remains in a closed position.
Dependencies are inferred from the claim text.