WO1988001687A1

WO1988001687A1 - Fuel saving device for internal combustion engines

Info

Publication number: WO1988001687A1
Application number: PCT/US1987/002039
Authority: WO
Inventors: Wesley F. Coker
Original assignee: Coker Wesley F
Priority date: 1986-08-25
Filing date: 1987-08-18
Publication date: 1988-03-10
Also published as: JPH02500533A; EP0323469A4; BR8707798A; AU7961587A; EP0323469A1

Abstract

A fuel saving device comprising a chamber (18) formed within a housing (12) adapted to be mounted between the carburetor (14) and the intake manifold (16) of an internal combustion engine, the chamber (18) having an inlet end opening (19) which registers with the discharge passage of the carburetor (14) and receives a fuel-air mixture formed in the carburetor, and an outlet end opening (20) which connects to the intake manifold. Micro-porous filter plates (32, 34, 38 and 40) are mounted in the chamber (18) transversely to the path of flow of the fuel-air mixture, are spaced from each other in the direction of flow, and a by-pass passage (46) is associated with some of the filter plates (32, 34, 38 and 40). Increased vaporization of the fuel results from the flow of the fuel-air mixture around and through the filter plates with the result that the fuel quantity can be reduced, fuel economy improved, and exhaust emissions decreased.

Description

DESCRIPTION

FUEL SAVING DEVICE FOR INTERNAL COMBUSION ENGINES

Technical Field

This invention relates to a device for improving the combustibility of a fuel-air mixture formed in a carburetor of an internal combustion engine. In general, the device of the invention, which is located at the downstream or discharge end of a car¬ buretor and receives a fuel-air mixture formed therein, enhances that mixture by increasing the physical mixing of the fuel and air and by increasing the vaporization of the fuel in the air.

Thus, when the enhanced fuel-air mixture is drawn into a cylinder of the engine and ignited, a more complete combustion of the fuel takes place. A signi¬ ficant reduction is thereby achieved in the amount of fuel required to operate an engine of given size, to¬ gether with a consequent reduction in the exhaust pollu¬ tion produced by the engine. Background Art

U.S. Patent No. 1,542,933 discloses a device which is adapted to be installed between the carburetor and intake manifold of an internal combustion engine, and which comprises a series of ordinary screens installed in a housing, each screen being backed by a perforated plate. The perforated plates are described as governor means for regulating the volume of the fuel-air mixture passing through the screens so as to control the speed of the engine. The plates thus reduce any effect the screens have on the fuel-air mixture; they reduce the amount of the mixture itself, not the amount of fuel in the mixture. Disclosure of Invention

In the description of the invention to follow, it will be understood that the term "intake manifold" applies to the passage or passages leading from the carburetor to the cylinder or cylinders of an internal combustion engine.

A fuel saving device of the invention comprises a housing adapted to the interposed between a carburetor and an intake manifold of an internal combustion engine. A chamber formed within the housing has an inlet end opening adapted to register with the discharge passage of the carburetor and receive a fuel-air mixture formed therein. An outlet end opening of the chamber is adapted to connect to the intake manifold. Micro-porous filter means are carried by the housing within the chamber, are disposed in the path of flow through the chamber of at least a portion of the fuel-air mixture, and are adapted to permit the flow of the mixture there¬ through, with consequent mixing of the fuel and air, together with, increased vaporization of the fuel. Preferably, the filter means comprises a plurality of micro-porous filter plates extending transversely to the path of flow of the fuel-air mixture through the chamber and disposed successively in the path of flow. Associated with at least one of the filter plates is a passage which permits the by-pass flow of a portion of the fuel-air mixture. For example, the filter plate means may comprise first, second, third and fourth successive filter plates, the first and fourth filter plates having a porosity range of 50 to 130 microns and the second and third filter plates having a porosity range of 25 to 50 microns. The filter plates are spaced from each other logitudinally, or in the path of flow. Other preferred features are that the chamber is formed with a transverse cross-sectional area which progressively increases from the cross-sectional area of the inlet end opening to a maximum cross-sectional area at a location between the inlet and outlet end openings; that the housing is a two-piece structure comprising an inlet end portion and an outlet end portion formed with mating surfaces which abut at the maximum cross-sectional area of the chamber; that one of the filter plates has a peripheral portion mounted in a recess formed in the mating surface of one of the housing portions; and, that the passage associated with a filter plate for permitting the by-pass flow of a portion of the fuel-air mixture is arranged peripherally of that filter plate. Description of Drawings

FIG. 1 is a sectional elevation taken through a fuel saving device constructed in accordance with the invention and showing the relationship of the device to a carburetor and intake manifold, indicated in broken line, of an internal combustion engine; and

FIG. 2 is a sectional elevation taken normal to the section of FIG. 1. Best Mode for Carrying Out the Invention

As shown in FIGS. 1 and 2, a fuel saving device 10 of the invention comprises a housing 12 adapted to be interposed between a conventional carburetor 14 and in¬ take manifold 16 of an internal combustion engine (not shown) . Formed within the housing 12 is a chamber 18 having an inlet end opening 19 and an outlet end opening 20. The inlet end opening 19 is adapted to register with the discharge passage of the carburetor and receive a fuel-air mixture formed therein; the outlet end opening 20 is adapted to connect with the manifold 16 and deliver the mixture thereto in enhanced form.

The housing 12 is a two-piece structure com¬ prising an inlet end part 22 and an outlet end part 23 formed with mating surfaces 24 that abut, the parts 22 and 23 having internal configurations such that the chamber 18 has a cross-sectional area which progressively increases (as shown in FIG. 1) from the cross-sectional area of the inlet end opening 19 to a maximum cross- sectional area intermediate the inlet and outlet end openings 19 and 20 and at the location of the abutting surfaces 24. It will be understood that the housing 12 has an external configuration adapted to mate with the opposed surfaces 26 of the carburetor 14 and 27 of the manifold 16; and has corner bosses 28 (FIG. 2) provided with suitable means for connecting the housing parts 22 and 23 together and for mounting the housing 12 between the carburetor 14 and the manifold 16.

Micro-porous filter plate means are carried by the housing 12 and are mounted within the chamber 18 for enhancing the combustibility of the fuel-air mixture formed in the carburetor 14. In the particular fuel saving device 10 illustrated, the filter plate means com¬ prise a first filter plate 32 attached to support pads 33 formed with the inlet end part 22 of the housing; a second filter plate 34 having a peripheral portion 35 mounted in a recess 36 formed in one of the abutting surfaces 24 and centrally supported by a transverse bar 37; a third filter plate 33; and, a fourth filter plate 40 attached to support pads 42 formed with the outlet end part 23 of the housing 12, the third filter plate 38 being positioned by spacers 44 on a bolt 45 extending through the second, third and fourth plates as best shown in FIG. 2.

The filter plates 32, 34, 38 and 40 extend transversely to the path of flow of the fuel-air mixture between the carburetor 14 and the manifold 16, and associated with each of the first, third and fourth filter plates is a passage means for permitting the by¬ pass flow of a portion of the fuel-air mixture, each passage means being formed by a gap 46 between the peri- phery of its plate and the ad acent wall of the chamber 18, Each of the filter plates 32, 34, 38 and 40 is 3 formed of a micro-porous material. A "micro-porous material" for purposes of the invention described and claimed herein, is a material through which the fuel-air 5 mixture can flow; or, in other words, a material having fine holes each of which forms an orifice. One example of such a micro-porous material is a sintered bronze filter made by Pacific Sintered Metals Co. of Los Angeles, California, in varying degrees of porosity. For example, 10 the first plate 32 may have a porosity range of 50 to 130 microns, the second and third plates 34 and 38 a porosity range of 25 - 50 microns, and the fourth plate 40 a poro¬ sity range of 50 - 130 microns.

It is presently believed that the successive 15 plates should preferably be spaced apart from each other logitudinally, or in the general direction of flow of the fuel-air mixture, as shown, thus dividing the chamber 18 into a plurality of sub-chambers in each of which mixing of the fuel and air and vaporization of the fuel takes 20 place.

Provided in the outlet end part 23 of the housing 12 is an opening 48 (FIG. 2) for a conventional crankcase ventilation connection 49, the opening being located at the downstream side of the fourth plate 40 so that crank- 25 case contaminants do not foul any of the plates. Industrial Applicability

An experimental device 10, constructed sub¬ stantially as shown and described and provided with four sintered bronze filter plates having the porosity ranges 30 specified above, has been tested on a 1977 Mercury auto¬ mobile equipped with a 400 cubic inch V-8 engine which in stock form tested at an average fuel consumption of 13.8 miles per gallon at highway speeds of 55-60 miles per hour. When equipped with the fuel saving device, it 35 was found that the carburetor jet could be reduced from a size 61 to a size 41, and that the average fuel consump- tion changed to 22 miles per gallon at the same high¬ way speeds of 55-60 ph - a mileage increase of about 60%. The same device, but with the third plate 38 re¬ moved, enabled the carburetor jet size to be reduced only to size 47 and gave an average fuel consumption of 20 miles per gallon at 55-60 mph. These results, which seem to clearly show that the device 10 functions to improve or enhance the combustibility of the fuel-air mixture, are given as indicative of the reductions in fuel consumption attainable from the invention.

It is presently believed the enhanced combus¬ tibility is achieved by one or more of the following actions on the fuel-air mixture during its passage through the mixing chamber of the device and through and around the plates provided therein:

1. The time for the fuel and air to mix is extended.

2._. The physical mixing of the fuel and air is increased by the flow of the mixture across and through the plates and through the by-pass passages associated therewith. 3. The fuel particle size is reduced, or in other words vaporization of the fuel is in¬ creased, by the passage of the fuel through the fine pores of the plates. Increased vaporization is also believed to result from pressure drops in the mixture caused by the plates and by the increasing cross-sectional area of the chamber 18. An indication of in- creased vaporization is that the housing 12 is cool to the touch even after an extended period of engine operation.

It will be appreciated by persons skilled in the art that the particular construction of the device 10 shown and described herein is only representative of the invention. The size and configuration of the housing 12 o. will have to be varied to suit the carburetor and mani¬ fold of each specific engine. In fact, the device could vj conceivably be constructed integrally with a carburetor, although the separate type of housing 12 disclosed is 5 believed to be preferable for ease of cleaning, if and when necessary. Also, the number of plates used in a particular design of the device, as well as their poro¬ sity, may be varied, as desired and described above. The use of a by-pass passage with at least one of the 10 plates is presently preferred in order that the flow of fuel-air mixture through the device is not restricted to the point where engine performance (e.g. acceleration) is impaired.

Claims

1. A fuel saving device comprising a housing adapted to be interposed between a carburetor and an in¬ take manifold of an internal combustion engine; a chamber formed within said housing, said chamber having an inlet end opening adapted to register with a discharge passage of said carburetor and receive a fuel-air mixture formed in said carburetor, and said chamber having an outlet end opening adapted to connect to said intake manifold; characterized by micro-porous filter means mounted within said chamber and extending transversely to the path of flow of said fuel-air mixture between said inlet and out¬ let end openings, said filter means being formed at least in part by a micro-porous filter plate adapted to permit the flow therethrough of the fuel-air mixture received from said carburetor.

2. A fuel saving device according to claim 1 wherein said filter means comprises a plurality of micro- porous filter plates arranged successively in the path of flow of said fuel-air mixture between said inlet and outlet end openings.

3. A fuel saving device according to claim 2 further comprising passage means associated with at least one of said filter plates for permitting the by-pass flow of a portion of said fuel-air mixture.

4. A fuel saving device according to claim 3 wherein said chamber is formed with a transverse cross- sectional area which progressively increases from the cross-sectional area of said inlet end opening to a maximum cross-sectional area intermediate said inlet and outlet end openings, and one of said filter plates is mounted at said maximum cross-sectional area.

5. A fuel saving device according to claim 4 wherein said housing is a two part structure comprising an inlet end portion and an outlet end portion, said portions being formed with mating surfaces which abut at said maximum cross-sectional area of said chamber.

6. A fuel saving device according to claim 5 wherein a recess is formed in the mating surface of one of said housing portions, and one of said filter plates has a peripheral portion mounted within said recess.

7. A fuel saving device according to claim 2 wherein at least one of said successively arranged micro- porous filter plates has a pore size which is smaller than the pore size of a preceding filter plate.

8. A fuel saving device according to claim 2 wherein the pore size of said successively arranged micro-porous filter plates progressively decreases and increases.

9. A fuel saving device according to claim 2 wherein said successively arranged micro-porous filter plates include adjacent upstream and downstream filter plates, said upstream filter plate being located closer to said inlet opening than said downstream filter plate and having a pore size greater than the pore size of said downstream filter plate.

10. A fuel saving device according to claim 2, 7, 8 or 9 wherein said successively arranged, transversely extending filter plates are spaced from each other longi- tudinally in the direction of flow of said fuel-air mixture,

11. A fuel saving device according to claim 2 wherein said housing is provided at the downstream side of said filter plates with an opening for a crankcase ventilation connection for said engine.

12. A fuel saving device for use with a car¬ buretor having a discharge passage for a fuel-air mixture formed in the carburetor and delivered to an intake mani¬ fold of an internal combustion engine, said device com¬ prising housing means for defining a chamber having an inlet forming an extension of said discharge passage and having an outlet adapted to be connected to said intake manifold; characterized by micro-porous filter plate means carried by said housing within said chamber for enhancing the combustibility of said fuel air mixture, said filter plate means being disposed in the path of flow through said chamber of at least a portion of said fuel-air mixture.

13. A fuel saving device according to claim 12 wherein said chamber is formed with a transverse cross- sectional area which progressively increases from the cross-sectional area of said discharge passage to a maximum cross-sectional area at a location between said inlet and outlet, and said micro-porous filter plate means is disposed at least in part in said progressively increasing cross-sectional area.

14. A fuel saving device according to claim 12 further comprising passage means associated with said filter plate means for permitting a portion of said fuel- air mixture to by-pass at least part of said filter plate means.

15. A fuel saving device according to claim 12 wherein said filter plate means comprises a plurality of filter plates disposed successively in the path of flow of said fuel-air mixture, said filter plates being spaced from each other in the direction of flow of said fuel-air mixture.

16. A fuel saving device according to claim 15 wherein the first of said plurality of filter plates is disposed at the upstream portion of the path of flow of said fuel-air mixture and has a pore size greater than the pore size of a downstream one of said filter plates.

17. A fuel saving device according to claim 16 wherein the last of said plurality of filter plates is disposed at the downstream portion of said path of flow and has a pore size greater than the pore size of an up- stream one of said filter plates.

18. A fuel saving device according to claim 17 wherein said first and last of said plurality of filter plates each have a porosity range of 50 to 130 microns, and are disposed on the upstream and downstream sides of at least one intermediate filter plate having a porosity range of 25 to 50 microns.

19. A fuel saving device according to claim 18 wherein said last filter plate has associated therewith means for providing a by-pass flow- for a portion of said fuel-air mixture.

20. A fuel saving device according to claim 15 wherein said housing means is provided at the downstream side of said plurality of filter plates with an opening for a crankcase ventilation connection for said engine.

21. The method of reducing the exhaust pollu¬ tion produced by an internal combustion engine having a passage through which fuel flows for ignition as a fuel- air mixture in said engine comprising the steps of: installing in said passage a micro-porous filter means in a manner such that the fuel must flow therethrough, and reducing the flow of fuel through said passage to an amount such that said fuel-air mixture is a lean mixture.

22. The method of reducing the fuel consump¬ tion of and exhaust pollution produced by an internal combustion engine having a carburetor within which a fuel-air mixture is formed and delivered through a dis¬ charge passage to an intake manifold of said engine, said method comprising the steps of: installing a micro-porous filter means in the path of flow of said fuel-air mixture through said dis¬ charge passage, and reducing the amount of fuel metered by said carburetor such that the fuel-air mixture formed therein is a lean mixture.