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US 8,418,525 B2Granted
Method for testing the operability of a tank shutoff valve of a fuel tank system
AssigneeRobert Bosch GmbH
InventorsSilke Haag, Andreas Pape, Carsten Kluth, Uwe Nusser
Life of this patent
Estimating the term…
Abstract
A method for testing the operability of a tank shutoff valve of a fuel tank system which is controlled by valves includes performing defined triggering of the tank shutoff valve and simultaneous introduction of an overpressure or partial vacuum into the fuel tank system via a pressure source, and the operability of the tank shutoff valve is determined on the basis of a variable which characterizes the introduction of the overpressure or partial vacuum.
Claims14
A method for testing the operability of a tank shutoff valve of a fuel tank system which is controlled by valves, comprising:
- a) performing a defined triggering of the tank shutoff valve, wherein the defined triggering includes opening the tank shutoff valve;
- b) substantially simultaneous with the defined triggering, introducing one of an overpressure or partial vacuum into the fuel tank system using a pressure source, wherein the introduction of one of the overpressure or partial vacuum into the fuel tank system occurs with a tank ventilation valve that is closed;
- and
- c) determining the operability of the tank shutoff valve on the basis of a detected variable which characterizes the introduction of the one of the overpressure or partial vacuum;
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a different time gradient in the case of the tank shutoff valve triggered to open in comparison to a predefined reference time gradient which characterizes an open tank shutoff valve, the tank shutoff valve is determined to be jammed in the closed position;
- and
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a time gradient corresponding to the predefined reference time gradient which characterizes an open tank shutoff valve, the tank shutoff valve is subsequently triggered to close, and the tank shutoff valve is determined to be jammed in the open position if the increase over time of the variable which characterizes the introduction of the one of the overpressure or partial vacuum does not subsequently change.
4 more elements
A method for testing the operability of a tank shutoff valve of a fuel tank system which is controlled by valves, comprising:
- a) performing a defined triggering of the tank shutoff valve, wherein the defined triggering of the tank shutoff valve includes closing the tank shutoff valve;
- b) substantially simultaneous with the defined triggering, introducing one of an overpressure or partial vacuum into the fuel tank system using a pressure source, wherein the introduction of the one of the overpressure or partial vacuum into the fuel tank system occurs with a tank ventilation valve that is closed;
- and
- c) determining the operability of the tank shutoff valve on the basis of a detected variable which characterizes the introduction of the one of the overpressure or partial vacuum;
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a different time gradient in the case of the tank shutoff valve triggered to close in comparison to a predefined reference time gradient which characterizes a closed tank shutoff valve, the tank shutoff valve is determined to be jammed in the open position;
- and
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a time gradient corresponding to the predefined reference time gradient which characterizes a closed tank shutoff valve, the tank shutoff valve is subsequently triggered to open, and the tank shutoff valve is determined to be jammed in the closed position if the increase over time of the variable which characterizes the introduction of the one of the overpressure or partial vacuum does not subsequently change.
4 more elements
A non-transitory computer-readable data storage medium storing a computer program having program codes which, when executed on a computer, perform a method for determining whether a tank shutoff valve of a fuel tank system which is controlled by valves is jammed in a closed or open position, the method comprising:
- a) performing a defined triggering of the tank shutoff valve, wherein the defined triggering includes opening the tank shutoff valve;
- b) substantially simultaneous with the defined triggering, introducing one of an overpressure or partial vacuum into the fuel tank system using a pressure source, wherein the introduction of one of the overpressure or partial vacuum into the fuel tank system occurs with a tank ventilation valve that is closed;
- and
- c) determining the operability of the tank shutoff valve on the basis of a detected variable which characterizes the introduction of the one of the overpressure or partial vacuum;
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a different time gradient in the case of the tank shutoff valve triggered to open in comparison to a predefined reference time gradient which characterizes an open tank shutoff valve, the tank shutoff valve is determined to be jammed in the closed position;
- and
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a time gradient corresponding to the predefined reference time gradient which characterizes an open tank shutoff valve, the tank shutoff valve is subsequently triggered to close, and the tank shutoff valve is determined to be jammed in the open position if the increase over time of the variable which characterizes the introduction of the one of the overpressure or partial vacuum does not subsequently change.
4 more elements
A non-transitory computer-readable data storage medium storing a computer program having program codes which, when executed on a computer, perform a method for testing the operability of determining whether a tank shutoff valve of a fuel tank system which is controlled by valves is jammed in a closed or open position, the method comprising:
- a) performing a defined triggering of the tank shutoff valve, wherein the defined triggering of the tank shutoff valve includes closing the tank shutoff valve;
- b) substantially simultaneous with the defined triggering, introducing one of an overpressure or partial vacuum into the fuel tank system using a pressure source, wherein the introduction of the one of the overpressure or partial vacuum into the fuel tank system occurs with a tank ventilation valve that is closed;
- and
- c) determining the operability of the tank shutoff valve on the basis of a detected variable which characterizes the introduction of the one of the overpressure or partial vacuum;
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a different time gradient in the case of the tank shutoff valve triggered to close in comparison to a predefined reference time gradient which characterizes a closed tank shutoff valve, the tank shutoff valve is determined to be jammed in the open position;
- and
- wherein if the detected variable which characterizes the introduction of the one of the overpressure or partial vacuum has a time gradient corresponding to the predefined reference time gradient which characterizes a closed tank shutoff valve, the tank shutoff valve is subsequently triggered to open, and the tank shutoff valve is determined to be jammed in the closed position if the increase over time of the variable which characterizes the introduction of the one of the overpressure or partial vacuum does not subsequently change.
4 more elements
Dependencies are inferred from the claim text.