| 摘要 |
A tank ventilation system for a motor vehicle has a fuel tank (4) and a pressure holding valve device (20) that function to maintain a slight positive pressure in the fuel tank (4) above fuel (8) in the fuel tank (4) by discharging an excess gas volumetric flow (16, 17). To optimize the tank ventilation system during fueling of the motor vehicle, the pressure holding valve device (20) has a throughflow cross section that is variable as a function of the discharged gas volumetric flow (16, 17) and increases with a rising gas volumetric flow (16, 17).
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