Filter device for ventilating device of a fuel tank of a vehicle

Abstract

Filter device (10) for ventilation of a fuel tank (100) of a vehicle, having a filter housing (20) with a filter chamber (22) filled with an adsorbent material (30), the adsorbent material For at least partially adsorbing fuel vapors, the filter housing has a tank port (24) for fluid communication with the fuel tank, an engine port (26) for fluid communication with an internal combustion engine (200) of the vehicle And a ventilation interface (28) for fluid communication with the environment, a buffer wall (40) is also arranged between the storage tank interface and the engine interface (26) in the filter chamber to avoid fuel vapor from the storage tank The interface (24) overflows directly into the engine interface (26), the buffer wall (40) has at least one hole section (42) with a through-hole (44) having resistance to fuel vapor The flow resistance to flow through depends on the flow velocity.

Description

technical field [0001] The invention relates to a filter device for a ventilation system of a fuel tank of a vehicle and to a buffer wall for such a filter device. Background technique [0002] It is well known that the fuel tank of a vehicle must have ventilation. This is generally used to avoid negative pressure in the fuel tank when fuel is being removed from the internal combustion engine. Likewise, when the tank is filled with new fuel through the filling nozzle or when an overpressure in the tank occurs due to thermal expansion at high external temperatures, the overpressure in the tank must be balanced. In the event of overpressure, it must be possible to escape gas from the fuel tank. This is usually released into the environment through the ventilation openings of the ventilation device. In this case, however, it must be ensured that excessive escape of fuel vapors via the ventilation device is avoided. Thus, in known fuel tanks, these ventilation means are equi...

AI Technical Summary

Problems solved by technology

However, the application of a negative pressure entails the risk that, in addition to or instead of the tank connection, saturated fuel vapors are re-breathed directly into the engine connection via a shorter path without bypassing the filter device

During the operation of this engine, this leads to the fact that regeneration can only be performed for a very short period, because otherwise the regeneration gases flowing into the internal combustion engine via the engine connection could have a negative composition that could adversely affect the combustion process

However, the use of a so-called buffer wall in the area of ​​the filter housing has the disadvantage that although this bypass prevents a direct overflow from the tank connection into the engine connection, the same section within the filter device cannot Regeneration via the buffer wall

The filter must therefore be designed correspondingly larger, since it cannot be completely restored to the regenerated state

Images