| 摘要 |
<p>The device comprises an activated carbon filter (7), a controllable tank shutoff valve (8), and two tank pressure control valves (9, 10), one of which opens in the case of a negative pressure in a fuel tank (1) and one of which opens in the case of an excess pressure in the fuel tank. The tank pressure control valves: are arranged inside the fuel tank and above a highest fuel level in a gas- or head space of the fuel tank; communicate with the gas- or head space about a liquid trap for separating liquid fuel; and are grouped together in parallel connection to a valve unit. The device comprises an activated carbon filter (7), a controllable tank shutoff valve (8), and two tank pressure control valves (9, 10), one of which opens in the case of a negative pressure in a fuel tank (1) and one of which opens in the case of an excess pressure in the fuel tank. The tank pressure control valves: are arranged inside the fuel tank and above a highest fuel level in a gas- or head space of the fuel tank; communicate with the gas- or head space about a liquid trap for separating liquid fuel; and are grouped together in parallel connection to a valve unit or a valve assembly (22) with a common tank port and a common filter connector. The activated carbon filter and the tank shutoff valve are arranged outside the fuel tank. The tank shutoff valve is connected through a conduit having the gas- or head space of the fuel tank or with the liquid trap communicating with the gas- or head space for separating the liquid fuel. A roll-over valve is located between the gas- or head space and the conduit. The tank shutoff valve and the tank pressure control valves are: arranged in the interior of the fuel tank and above the highest fuel level in the gas- or head space of the fuel tank; and grouped together in parallel connection to the valve unit or the valve assembly with the common tank port and the common filter connector. The tank port is connected with the liquid trap by a conduit disposed within the fuel tank for separating the liquid fuel, and the activated carbon filter is connected with the outside of the fuel tank by the conduit extending from the fuel tank. The liquid trap communicates with the gas- or head space via the roll-over valve. The tank shutoff valve remains in a closed manner during operation of an internal combustion engine, and the pressure in the fuel tank is controlled by the tank pressure control valves. The tank pressure control valves are mechanical valves, each of which comprises two chambers separated by a membrane. The chambers communicate with the activated carbon filter.</p> |
