Device for ventilating a fuel tank
First Claim
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1. A device for ventilating and aerating a fuel tank of an internal combustion engine, comprising:
- an activated carbon filter;
a tank shutoff valve arranged in a gas line between the fuel tank and the activated carbon filter; and
a control unit for controlling the at least one valve in dependence on at least one of a load factor of the activated carbon filter and an operating cycle duration of the internal combustion engine, wherein at least one member selected from the group consisting of an opening cross section of the tank shut-off valve and an opening duration of the tank shut-off valve is decreased or an opening pressure of the tank shut-off valve is increased when the load factor of the activated carbon filter is high and the tank shut-off valve is opened in response to an overpressure in the fuel tank.
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Abstract
A device for ventilating a fuel tank of an internal combustion engine in particular of a fuel tank of an internal combustion engine of a motor vehicle includes an activated carbon filter and at least one valve which is controllable by a control unit. To prevent leakage of hydrocarbons into the environment without enlargement of the activated carbon filter the control unit controls the valve in dependence on a load factor of the activated carbon filter and/or in dependence on an operating cycle duration of the internal combustion engine.
39 Citations
12 Claims
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1. A device for ventilating and aerating a fuel tank of an internal combustion engine, comprising:
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an activated carbon filter; a tank shutoff valve arranged in a gas line between the fuel tank and the activated carbon filter; and a control unit for controlling the at least one valve in dependence on at least one of a load factor of the activated carbon filter and an operating cycle duration of the internal combustion engine, wherein at least one member selected from the group consisting of an opening cross section of the tank shut-off valve and an opening duration of the tank shut-off valve is decreased or an opening pressure of the tank shut-off valve is increased when the load factor of the activated carbon filter is high and the tank shut-off valve is opened in response to an overpressure in the fuel tank. - View Dependent Claims (2, 3, 5, 6, 7, 11, 12)
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4. A device for ventilating and aerating a fuel tank of an internal combustion engine, comprising
an activated carbon filter; -
a ventilation and aeration valve arranged in a gas line between the activated carbon filter and an environment; and a control unit for controlling the at least one valve in dependence on at least one of a load factor of the activated carbon filter and an operating cycle duration of the internal combustion engine, wherein at least one member selected from the group consisting of an opening cross section of the tank shut-off valve and an opening duration of the tank shut-off valve is decreased or an opening pressure of the tank shut-off valve is increased when the load factor of the activated carbon filter is high and the tank shut-off valve is opened in response to an overpressure in the fuel tank.
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8. A device for ventilating and aerating a fuel tank of an internal combustion engine, comprising
an activated carbon filter; -
a regeneration valve and aeration valve arranged in a gas line between the activated carbon filter and an intake tract of the internal combustion engine; and a control unit for controlling the at least one valve in dependence on at least one of a load factor of the activated carbon filter and an operating cycle duration of the internal combustion engine, wherein at least one member selected from the group consisting of an opening cross section of the tank shut-off valve and an opening duration of the tank shut-off valve is decreased or an opening pressure of the tank shut-off valve is increased when the load factor of the activated carbon filter is high and the tank shut-off valve is opened in response to an overpressure in the fuel tank. - View Dependent Claims (9, 10)
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Specification