Method and control unit for functional diagnosis of a fuel tank ventilation valve in a fuel tank system, especially in a motor vehicle
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Abstract
In a method for testing the functional reliability of a fuel-tank venting valve which is provided in a tank system of a motor vehicle in particular, is connected to an intake manifold and is triggerable by a control unit, a pressure source is provided for testing the tank system for leaks by using excess pressure or a vacuum, and the test of the functional reliability of the fuel-tank venting valve is performed on the basis of at least one performance quantity of the pressure source. In order to achieve a short diagnostic time and a high degree of diagnostic certainty, the fuel-tank venting valve is triggered to open or close, and a certain change in pressure is implemented. The at least one performance quantity of the pressure source is detected, and a properly opening and closing fuel-tank venting valve is determined from the performance quantity thus detected.
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Citations
20 Claims
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1-10. -10. (cancelled).
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11. A method for testing functional reliability of a fuel-tank venting valve situated in a motor vehicle tank system which is connected to an intake manifold and is triggerable by a control unit, a pressure source being provided for testing the tank system for leaks by using excess pressure or a vacuum, the method comprising:
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triggering the fuel-tank venting valve to open or close to implement a change in pressure;
detecting at least one electric performance quantity of the pressure source; and
determining a properly opening and closing fuel-tank venting valve from one of;
i) the at least one electric performance quantity detected, or ii) a change in the at least one electric performance quantity detected. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A control unit for testing functional reliability of a fuel-tank venting valve situated in a motor vehicle tank system which is connected to an intake manifold, a pressure source being provided for testing the tank system for leaks by using pressure or vacuum, the control unit comprising:
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an arrangement configured to trigger the fuel-tank venting valve to open or close to implement a change in pressure;
an arrangement configured to detect at least one electric performance quantity of the pressure source; and
an arrangement configured to determine a properly opening and closing fuel tank venting valve from one of;
i) the at least one electric performance quantity, or ii) a change in the at least one electric performance quantity detected.
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20. A tank leakage diagnostic device, comprising:
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a pressure source for testing a motor vehicle tank system for leaks by using pressure or vacuum; and
a control unit configured to trigger a fuel-tank venting valve to open or close to implement a change in pressure, detect at least one electric performance quantity of the pressure source, and to determine a properly opening and closing fuel-tank venting valve from one of;
i) the at least one electric performance quantity, or ii) a change in the at least one electric performance quantity detected.
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Specification