| 摘要 |
A tank ventilation system for a motor vehicle includes a tank (1) for combustible fuels. An activated carbon filter (20) is connected to the tank (1) via a connecting line (7) and adsorbs hydrocarbon vapors of the tank (1) for deaeration. An electrically activatable check valve (30) is in the connecting line. A differential pressure sensor (3) measures the pressure difference between the vapor chamber (21) of the tank (1) and the environment. The connecting line is formed without a vacuum valve. A mechanical vacuum valve (6) is provided for tank aeration with respect to the environment. The check valve is closed if the pressure difference measured by the differential pressure sensor is below a fixed, positive threshold value, and is open if the pressure difference is above the threshold value.
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