Title:
A LIQUID METERING DEVICE
United States Patent 3857543


Abstract:
A liquid metering device designed primarily for metering fuel into an internal combustion engine of the reciprocating type, is installed within the intake pipe of the intake manifold. The pump device comprises an elongated housing having a port at one end, a rod-like member is arranged in a housing coaxially therewith, with one end of the member secured to the closed end of the housing. The other end of the member carries an enlarged head which is arranged to snugly but slidably fit within the port. The member and housing are made of magnetostrictive materials of different polarity and the entire housing is surrounded by an electromagnetic coil which is arranged to connect to a current pulse generator. Liquid is introduced into the housing and current pulses from the generator are applied to the coil. The magnetostrictive characteristics of the housing and piston cause the housing to elongate relative to the member with each pulse, so that a shearing action takes place between the head and wall of the port which forces the liquid out of the device in the form of uniform small diameter liquid particles, which are carried along by the air into the intake manifold and into the engine cylinders. A similar device is used to meter water into the intake manifold to increase the efficiency of the engine by increasing the anti-knock properties of the fuel and, in turn, the pollutants exhausted from the engine are minimized.



Inventors:
MCKEEN J
Application Number:
05/342235
Publication Date:
12/31/1974
Filing Date:
03/16/1973
Assignee:
MCKEEN J,US
Primary Class:
Other Classes:
123/25L, 123/25M, 137/896, 239/102.2, 251/129.08, 431/1
International Classes:
F02M7/16; F02M27/04; (IPC1-7): B05B3/14; F16K31/02
Field of Search:
239/101,102 431
View Patent Images:
US Patent References:



Foreign References:
GB256226A1927-10-13
Primary Examiner:
Rosenthal, Arnold
Attorney, Agent or Firm:
Nardelli, Dominick
Claims:
I claim

1. A liquid metering device comprising:

2. The device of claim 1 wherein a bell-shaped surface extends from the outer periphery of said opening, and a conical surface extends from the inner periphery of said head, so that an annular volume is formed outside the compartment which increases in size.

3. the device of claim 2 wherein:

4. A device for supplying liquid into a flowing air stream within a pipe, said device comprising:

5. The device of claim 4 wherein said compartment is made of a material that expands under the influence of a magnetic field.

6. The device of claim 4 wherein said compartment has an internal bell-shaped surface extending away from the outer periphery of said opening; and

7. The device of claim 5 wherein said compartment has an internal bell-shaped surface extending away from the outer periphery of said opening; and

Description:
FIELD OF THE INVENTION

This invention relates to a liquid metering device and, more particularly, to a carburetor utilizing a liquid metering device which controllably feeds liquid into the intake of a manifold in accordance with the engine's speed and acceleration.

BACKGROUND OF THE INVENTION

In conventional internal combustion engines, the fuel is divided by the carburetor by using an asperating principle, and the fuel is divided into fine particles or droplets which are mixed with the air to form a combustion mixture. These fine particles are inherently unequal in size. This mixture is fed to the engine, where it is ignited. These prior art engines have several drawbacks. First, they are pressure sensitive; that is, the air fuel ratio depends upon the atmospheric pressure in which the engine is operated. Thus, at low speeds, the air-fuel ratio is different than at high speeds. Also, while accelerating, the accelerator pump pumps relatively large amounts of fuel into the manifold, wetting the internal surfaces. Then at a steady speed, the liquid fuel evaporates, enriching the mixture that results in unburned fuel being exhausted.

Compounding the problem is the fact that present day engines require fuel additives (tetraethyl lead) to prevent preignition, commonly known as engine ping or knock. Many of the additives do not enter into the combustion process, but pass through the engine. The high combustion temperatures (of about 3000°F) changes the equilibrium constant of the combustion process wherein relatively large amounts of ammonia and oxides of nitrogen are produced. In other words, the higher temperature increases the production of toxic compounds which are discharged into the atmosphere. Water has been known, for a long time, as an anti-knock compound, and is used in present day aircraft with reciprocating engines. Water is known to have a cooling effect on the combustion process so that the production of these toxic compounds is sharply reduced as well as preventing engine knock. However, water injection, as presently known, is costly and relatively complex and heretofore has not been used in commercial and passenger highway vehicles utilizing these reciprocating type internal combustion engines.

OBJECTS OF THE INVENTION

An object of this invention is to provide a simple, economical means for reducing knock and toxic emission compounds from reciprocating internal combustion engines.

Another object of this invention is to provide a means for delivering liquids to an internal combustion engine in droplets of a relatively uniform size wherein the drop size increases with engine speed.

Another object is to provide a means for delivering fuel to an internal combustion reciprocating engine wherein the droplets are substantially of the same size at any given time.

Another object is to provide a liquid metering device which delivers precise controlled amounts of liquid in controlled droplet size.

Another object is to provide a liquid metering device which performs reliably for relatively long periods with minimum maintenance.

Another object of the invention is to provide a device for metering fuel to an internal combustion engine which is relatively insensitive to changes in ambient temperature and pressure conditions.

Another object of this invention is to provide a device for metering fuel to an engine which requires a minimum amount of adjustment in use.

Another object of this invention is to provide a device for metering fuel to an engine which is rugged and has a minimum number of working parts, giving it a long useful service life.

Other objects and features of advantage of the invention will become more apparent after perusing the description of the preferred embodiment, together with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the intake pipe of a reciprocal internal combustion engine, in axial section wherein is schematically shown the novel liquid device, together with the power source in block form.

FIG. 2 is an enlarged section of the outlet of the device of FIG. 1, showing the piston thereof fully retracted.

FIG. 3 is the same view as in FIG. 2 wherein the piston has started its movement to the extended position.

FIG. 4 is the same view as FIG. 3 wherein the piston has moved further to its extended position, showing the droplets being formed.

FIG. 5 is the same view as FIG. 4 wherein the piston is in a fully extended position, showing the droplets drifting away therefrom.

DETAILED DESCRIPTION OF THE DRAWINGS

Referring to FIG. 1, item 10 represents an intake pipe to the manifold (not shown) of a reciprocal internal combustion engine. The intake pipe 10 is preferably of the down-draft type, and over and above the pipe 10 would be placed a conventional air cleaner. Unlike the intake pipes in standard present day engines, this pipe would be nonmagnetic for reasons that will become apparent hereinafter. The butterfly valve (not shown) for acceleration would be located preferably above the intake pipe shown in FIG. 1. Axially disposed within the pipe 10 are two novel devices, 11 and 12, which are used to feed fuel and water, respectively, into the engine. Both devices 11 and 12 are constructed the same, and therefore only device 11 will be described in detail. The device has a tubular body 13, with a closure disk 14 at one end, and on the other end is formed an outlet port or opening 16 that is smaller than the internal diameter of the body 13. Snugly disposed within the opening 16 is a piston head 17. The head is suitably fixed by an axially disposed rod 18 to the disk 14. Near the disk 14 is formed an inlet port into which is disposed a tube 19 to allow liquid to be pumped into the cavity of the device. In device 11 the liquid would be fuel while in device 12 the liquid would be water. A suiter spider means 21 supports the device axially within the pipe 10. Since the air is flowing down through the pipe 10, as viewed in the drawings, ends 14 of the respective devices are provided with a streamlining means 15. In contrast with present day intake pipes, the outside of pipe 10 has an electromagnetic coil 22 therearound. The purpose of the coil 12 is to activate the devices to supply fuel and water to the engine. In order that the devices respond to the magnetic field, the rods 18 are preferably made of magnetostrictive material that contracts within a magnetic field. For example, such a material is cobalt-iron alloy, which is normally referred to as a negative magnetostrictive material. The body 13 is preferably non-magnetic and of zero magnetostrictivity, or it could be made, for example, of nickel which is positive magnetostrictive. Therefore, when a magnetic field is formed by coil 22, the piston head 17 retracts into the body 13 of the device, as shown in FIG. 2. For a given set of magnetostrictive materials, this distance that the head retracts is dependent on the strength of the magnetic field. With the head retracted, a somewhat toroidal meniscus 23 grows because the liquid flows out or is forced out by being displaced by the head 17 of the ring-shaped opening formed therein. FIG. 3 shows the meniscus 23 larger and the head 17 closer to the periphery of the outlet opening 16. FIG. 4 shows that the liquid has been sheared by the head 17 and the toroidal-shaped liquid breaking up into droplets 24. A point 26 on the head 17 aids in the formation of the toroidal-shaped meniscus. Because the toroid is uniform is the reason the resulting droplets are believed to be uniform.

FIG. 5 shows the droplets 24 drifting apart and the head 17 is in the home position. The droplets inherently are of uniform size and the size thereof are also inherently relative to the stroke of the piston head, i.e., the larger the stroke the larger the droplet size. Due to the shearing action of the piston head, the droplets are electrically charged, having under normal circumstances a positive charge. The charge on the droplets cause the droplets to repel each other, and this is believed to be the reason that the ring of droplets 24 in FIG. 5 grows larger. The bell-shape 26 on the end of the body 13 aids the growth of the rings of the charged droplets which tend to be attracted to the wall thereof. The droplets are formed at a rate, for example, of 1,000 HZ (cycles per second) and the pulsating power to the coil is supplied by a suitable, variable high-pulse generator 31. Since amplitudes of the pulse determine the magnetic field strength, the generator 31, should be of the type that changes the amplitude of the pulses in order to increase the drop size. As the engine is speeding up, therefore fulfilling the requirement for more fuel. This, besides taking care of the increased fuel requirements of the engine, inherently provides an anti-knock feature. The anti-knock feature is explained as follows: the large drops within the cylinder absorb heat from the compression stroke as they vaporize. Therefore the temperature of the combustion mixture is lower than in standard present day engines. If the vaporization of fuel alone is not sufficient to prevent engine knock, the function of the water pump 12 is to introduce droplets of water into the combustion mixture to provide more pre-cooling. One sees that, as the engine speeds up, the anti-knocking properties of the fuel should increase since the pressures increase. This invention inherently provides a feature that increases the anti-knock properties of the fuel as the engine speeds up.

Since the system is to be automatic in that the flow of fuel should increase with demands and without human adjustments, the pulse generator 31 has an additional feature and at the pulse height responds to an increase in amplitude of the impressed voltage thereon. This feature is also attained in a state of direct pulse generator. In this case, the voltage is attained from a suitable pressure transducer 32. The presssure transducer 32 responds, for example, to manifold pressure. The pressure within the manifold is directly related to the amount of fuel required. In addition, if one requires, one could also sense the RPM of the engine by another state of the art transducer (not shown) to provide a feedback signal to prevent what is commonly termed a hunting or oscillating effect. Thus, by monitoring the RPM and the manifold pressure, the system could make a decision by the use of a suitable circuit (not shown) that the engine is accelerating; therefore supplying more fuel than when the engine is at a steady state condition. If, in addition, the system could decide, with a high RPM and a low manifold pressure, that the engine is decelerating and therefore would sharply reduce the supply of fuel to the engine; therefore, also aiding in reducing toxic emissions.

Although one embodiment of the invention has been described, the invention is not limited to the described embodiment. One skilled in the art, after studying this disclosure, could conceive other embodiments which incorporate the scope of this invention. Therefore, the invention is considered to be limited only by the scope of the appended claims.