Valve for metered introduction of volatilized fuel

Details Valve for metered introduction of volatilized fuel Valve for metered introduction of volatilized fuel

1997-01-02

1998-09-22

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

137550, F02M 3704, B01D 1500

Patent

active

058099778

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a valve for metered introduction of volatilized fuel from a fuel tank of an internal combustion engine into an intake tube of the engine.
Such a valve is already known (German Patent Disclosure DE-OS 40 23 044), to which fuel is supplied via an inflow adapter in order subsequently to feed this fuel in metered fashion into the intake tube via an outflow adapter provided on the valve. The inflow adapter of the valve communicates, for instance via a hose, with an adsorption filter which temporarily stores the volatilized fuel vapors from the fuel tank and supplies them to the valve via the hose. The danger is that dirt in the fuel, for instance from the adsorption filter, can get into the interior of the valve and impair proper function of the valve and hence operating safety. To avoid this, dirt filters are built in, for instance in the hose between the adsorption filter and the valve or in the inflow adapter of the valve. The hose or the inflow adapter of the valve, however, has only a small flow cross section, so that the dirt filter can likewise have only a small flow cross section. Such dirt filters can become relatively rapidly plugged by the dirt in the fuel, however, resulting in increased flow resistance at the dirt filter, which causes a pressure loss and hence a reduction in the throughput of the valve.


ADVANTAGES OF THE INVENTION

The valve according to the invention has an advantage over the prior art that the valve has proper function and high operating safety over the intended service life. This is advantageously possible with a dirt filter that causes only an extremely slight pressure loss over the intended service life, so that a reduction in the throughput of the valve can be averted. It is especially advantageous that the dirt filter provided for this purpose can be built into the valve in a simple way, so that the dirt filter adds only slightly to the production cost of the valve. It is also advantageous that the dirt filter does not hinder an operation of adjusting the throughput of the valve, and thus it can be installed in already known valves, without requiring major structural changes.
By the provisions recited herein advantageous further features of and improvements to the valve are possible.


BRIEF DESCRIPTION OF THE DRAWING

One exemplary embodiment is shown in the drawing in simplified form and described in further detail below.
FIG. 1 is a longitudinal section through a valve embodied according to the invention;
FIG. 2 shows a partial detail of the valve in perspective which illustrates a filter with the parts rotated 180 degrees from that shown in FIG. 1; and
FIGS. 3a-d illustrate different shapes for the end region of the magnet core.


DESCRIPTION OF THE EXEMPLARY EMBODIMENT

The valve 1 schematically shown in longitudinal section in FIG. 1 serves the purpose of metered introduction of volatilized fuel from a fuel tank of an internal combustion engine into an engine intake tube; it is part of a fuel vapor trapping system, not shown in further detail, of an internal combustion engine. The structure and function of such fuel vapor trapping systems can be learned for instance from Bosch Technische Unterrichtung, Management!, Second Edition, August 1993, pp. 48 and 49. The structure and mode of operation of such a valve 1, also known as a regeneration valve or tank vent valve, is also known to one skilled in the art from German Patent Disclosure DE-OS 40 23 044, which is hereby incorporated by reference into the present patent application.
The valve has a two part valve housing 3, with a cup-shaped housing part 4 and a cap-shaped housing part 5. The cap-shaped housing part 5 can be placed on the cup-shaped housing part 4 and closes the latter off. The cup-shaped housing part 4 carries an inflow adapter 8 for connection to a vent adapter of the fuel tank or to an adsorption filter downstream thereof. The adsorption filter is filled with a storage medium for fuel, such as activated charcoal, and serves the purpose of temporarily storing fuel v

REFERENCES:
patent: 1920925 (1933-08-01), Juchheim et al.
patent: 4543983 (1985-10-01), Pauliukonis
patent: 5024254 (1991-06-01), Yamagiwa
patent: 5150879 (1992-09-01), Mullally
patent: 5178116 (1993-01-01), Fehrenbach et al.
patent: 5183022 (1993-02-01), Cook
patent: 5429099 (1995-07-01), Deland
patent: 5501198 (1996-03-01), Koyama

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