Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1998-10-30
1999-11-16
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3704
Patent
active
059838701
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an adsorption filter for a fuel tank venting system of an internal combustion engine according to the pre-characterizing clause of patent claim 1 and to a method for operating this system.
The filter as such is known, for example, from DE 41 24 465 A1.
Proceeding from this, the invention is concerned, in respect of the design of such a filter, with the problem of designing the individual assemblies of the fuel tank venting system as a compact modular part which is economical to manufacture and can be fitted in a simple way to the tank and the intake-air line of the internal combustion engine.
This part of the object is achieved by designing the absorption filter according to the characterizing features of patent claim 1.
The subclaims indicate advantageous embodiments of this design.
The problem with which the invention is concerned also involves ensuring a reliable regeneration of the absorption material even in engines in which, for whatever reasons, an insufficient vacuum prevails in the intake-air line while the engine is operating.
This problem relating to the operation of the device according to the invention is solved by means of a method having the characterizing features of patent claim 1.
Although it is already known from DE 26 01 044 A1 and DE 25 47 065 A1 to regenerate an adsorption filter by means of air from a compressed-air source, those devices and methods nevertheless refer to special instances which cannot be compared with the operation of a system to which the present invention relates.
The further claims relate to expedient embodiments.
The teaching of claim 6 ensures that the engine combustion process is not adversely influenced by air which is pumped into the intake line of the internal combustion engine and led through the adsorption filter.
An exemplary embodiment of the invention is illustrated diagrammatically in the single FIG. 1 of the drawing.
In an adsorption filter housing 1, a larger and a smaller chamber for receiving activated charcoal as a medium for the adsorption of fuel vapors from an internal combustion engine tank, not illustrated, are formed by means of a partition 2. The smaller chamber is designated by 3 and the larger chamber by 4. The two chambers 3 and 4 are vertically closed at the top and bottom by means of permeable covers 5 and 6, a clearance relative to an adjacent wall of the filter housing 1 being provided, in each case to form a flow duct, on the sides of the covers 5 and 6 which face away from the covered activated charcoal. This flow space is separated vertically at the bottom, between the smaller and larger chambers 3 and 4, by means of the intermediate wall 2.
The flow duct located vertically above the upper cover 6 is formed by an intermediate wall 7 of the filter housing 1. An additional separate flow duct 8 is also formed by the intermediate wall 7 together with a region of the outer wall of the filter housing 1.
A connection piece 9 leading into the larger chamber 4 is provided for connecting a tank venting line. A sieve basket 10 is slipped over the mouth of this connection piece 9, the said mouth leading into the activated charcoal. The larger chamber 4 can be connected, via a further connection piece 11, to a region of the intake-air line of the internal combustion engine, the said region being under a vacuum when the engine is in operation. The last-mentioned connection can be broken by means of a valve.
A connection piece 12 leading to the atmosphere is located on an air-filter housing 13 connected to the adsorption filter housing 1. Seated in the air-filter housing 13 is an annular air filter 14, of which the radially outer region is connected to the line 12 for connection to the atmosphere and the radially inner region is connected to the flow duct 8.
A housing having a compressed-air source 15 is attached directly to the filter housing 1, this compressed-air source being, in particular, an air pump. The housing of the compressed-air source 15 is attached via junction lines 16 and 17 leading into the interior of t
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Bohl Matthias
Brodesser Kay
Haufe Harald
Mohr Uwe
Schweikert Klaus
Knecht Filterwerke GmbH
Miller Carl S.
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