TANK VENTING SYSTEM AND METHOD FOR DIAGNOSING SAME
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Accused Products
Abstract
A tank venting system of an internal combustion engine having an intake manifold, a fuel tank, and an activated carbon filter includes: a tank vent valve; at least one check valve; and a pressure sensor situated between the tank vent valve and the check valve. For diagnosing this tank venting system, a negative pressure which is lower than the ambient pressure outside the engine system is stored between the tank vent valve and the check valve. The stored pressure is changed by controlling the tank vent valve, and the change in the pressure is measured via the pressure sensor. The functioning of the tank venting line, of the check valve, and of the tank vent valve is deduced from the correlation of the opening state of the tank vent valve with the change in pressure.
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Citations
19 Claims
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1-10. -10. (canceled)
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11. A tank venting system for an internal combustion engine having an intake manifold, a fuel tank, and an activated carbon filter, the system comprising:
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a tank vent valve situated in a line connecting the activated carbon filter to the intake manifold; at least one check valve situated in the line between the tank vent valve and the intake manifold; and a pressure sensor situated in the line between the tank vent valve and the check valve. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification