JPH0112942B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for conveying fuel in small quantities and at high speeds, in particular for metering and conveying fuel in internal combustion engines.

The advantages of metering fuel to an engine by an injector as compared to a carburetor are well known. carried out by a fuel injection device,
Because of the improved quantitative control of fuel delivered to the engine, low fuel consumption is achieved in conjunction with high power output. Additionally, the fuel injection device reduces the level of contamination in the exhaust gas emitted from the engine, resulting in improved starting and acceleration characteristics of the engine. Note that the method and apparatus of the present invention can be used for both diesel engines and gasoline.

Although many effective fuel injection systems are known, carburetors are inexpensive to manufacture and, in part, because they are primarily low-pressure devices, inexpensive to maintain. This makes it a suitable device for metering fuel to the engine. The high pressures found in fuel injection systems require high accuracy in the dimensions and surface finish of numerous components, especially in fuel pumps and metering equipment, as well as high precision and high quality of seals between moving parts. be. In known fuel injection devices, injection is usually accomplished by a mechanical mechanism such as a piston moving within a cylinder. In view of the high pressures required to inject the fuel, the forces required are commensurately high, which absorbs significant energy and requires materials and surface treatments to reduce wear.

No. 3,698,368 proposes a fuel injection system for two-stroke engines, but this system is not known to have proven commercially successful. In many embodiments of this device described in this patent specification, a rigid piston is employed and therefore these embodiments exhibit the general disadvantages mentioned above.

In one embodiment, a diaphragm pump is used, the suction stroke of which can be varied to adjust the amount of fuel delivered.
It is believed that the inherent high flexibility of the diaphragm works against achieving accurate metering of fuel.

In view of the relatively high manufacturing costs of known fuel injection systems, this system is not currently used in vehicles that are popular in the high volume, low cost category of motor vehicles. However, given the increasing demand for lower levels of pollution in exhaust gases, it is desirable to equip all motor vehicles with fuel injection devices, provided they can be installed at a reasonable cost. I think that the.

It is therefore a principal object of the present invention to provide a method for metering liquids, such as fuel metering, for internal combustion engines that is operationally effective, does not require high precision manufacturing tolerances or finishes, and is therefore relatively inexpensive to manufacture. The objective is to provide a method and apparatus for carrying out this process.

With this purpose in mind, filling the chamber with fuel,
Selectively opening an exhaust port in a chamber to allow gas to flow into the chamber at a pressure sufficient to displace fuel from the chamber; displace the fuel from the chamber by the inflow of gas for the purpose of regulating the amount of fuel being conveyed; A method of metered fuel delivery is provided which comprises controlling the amount of fuel produced.

In order to maintain precision and repeatability in terms of the quantity of fuel dispensed from the chamber, it is important to ensure that the chamber is completely filled with fuel before the gas enters. Furthermore, it is important that after displacement of each metered amount of fuel, the chamber is cleared of residual gas before the next metered amount of fuel is conveyed.

All gas is forced out of the chamber before the transfer cycle begins, and when fuel transfer is required, the circulation is terminated and liquid is conveniently circulated into the chamber so that the chamber is sealed and filled with fuel. It is.

More particularly, the method includes: circulating fuel through the chamber for the purpose of filling the chamber with fuel and maintaining the chamber filled with liquid; terminating said circulation at intervals; and selectively discharging the exhaust port of the chamber. allowing gas to enter the chamber during the completion of said circulation at a pressure sufficient to displace liquid from the chamber upon opening; and a portion of fuel displaceable from the chamber by said inflow of gas to regulate the amount of fuel conveyed. A method of delivering metered fuel is provided that comprises controlling the amount.

The amount of fuel that can be displaced by the inflow of gas can be controlled by varying the relative position of the inflow of gas to the chamber and the amount of fuel being discharged from the chamber. When gas enters the chamber, essentially only the fuel between the level of the gas inlet and the level of the fuel exhaust port is displaced by the incoming gas, and the fuel between the level of the gas inlet and the level of the fuel exhaust port is displaced by the incoming gas. It will be appreciated that liquid outside the intervening space is essentially not removed.

When the gas enters the chamber, an interface is formed between the gas and the fuel at the cross-section of the chamber. The interface moves along the chamber from the gas inlet point to the fuel outlet point, displacing the fuel in front of the interface towards the liquid outlet. Once the boundary reaches a point where the fuel is no longer in direct communication with the discharge point, further movement of the boundary is prevented, thus stopping the discharge of fuel.

Alternatively, the amount of fuel discharged can be controlled by controlling the volume of the chamber between the gas inlet point and the fuel outlet point, thus both points being fixed. I can do it.

In view of the foregoing objects, a chamber is provided with a discharge port that is selectively openable, a device operable to supply fuel to said chamber to fill the chamber with fuel ready for discharge; a device operable to selectively cause gas to enter the chamber at a pressure sufficient to displace fuel from the chamber when the gas enters the chamber; and an amount of fuel that can be displaced from the chamber by the introduction of gas into the chamber. A device for conveying a metered liquid is also provided, comprising a device for controlling.

More particularly, the present invention includes a chamber having an exhaust port that can be selectively opened, a device for circulating fuel through the chamber to maintain the chamber filled with fuel, and a device for circulating fuel through the chamber to maintain the chamber filled with fuel. a device operable to cause gas to enter the chamber at a pressure sufficient to displace the liquid from the chamber during the termination of the circulation and upon opening of the discharge valve; The present invention provides an apparatus for conveying metered fuel with a device for controlling the amount of fuel that can be displaced from the chamber by the inflow of fuel.

The fuel is discharged through a closed circuit having a chamber, and conveniently an inlet and an outlet valve are provided to temporarily separate the chamber from the closed circuit in order to terminate the circular flow through the chamber. An inflow valve and an outflow valve are provided to maintain the chamber filled with fuel during circulation. When the inflow and outflow valves are closed,
Both inflow and outflow valves remain closed during the flow of gas into the chamber until displacement of the fuel by the gas is completed.

Conveniently, the chamber is provided with ports for gas entering the chamber and for fuel exiting the chamber, one or both of the ports being relatively movable. Therefore, the amount of liquid that can be displaced from the chamber by the incoming gas is limited to one of the ports in order to reduce the amount that can be displaced from the chamber.
controlled movement of one or both toward each other and away from each other for the purpose of increasing the amount.

The device controlling the amount of fuel that can be displaced from the chamber can be operated manually or automatically by a preset program responsive to selected conditions.

An advantage of the invention is that fuel is conveyed from the chamber by the inflow of gas into the chamber, rather than by the movement of a piston or plunger which must bear seals suitable to withstand the high pressures encountered. It is in. One such seal for each conveyance.
It must also withstand high speed operations and high number of operations resulting from the power stroke and one return stroke. According to the invention, the moving components are only moved for the purpose of reducing fluctuations in fuel requirements, making them less frequent and slower compared to mechanical pump piston movements.

The invention will be more easily understood from the following description, which is made with reference to the accompanying drawings, which illustrate practical applications of the method of the invention and the practical construction of the apparatus of the invention. The drawings and the following description are not the only practical forms of the method and apparatus of the invention, and
It is not intended to limit the scope of the invention.

In the following description, with reference to the accompanying drawings, the method and apparatus of the invention will be considered as applied to a fuel injection system for an internal combustion engine, but it may also be used to convey a controlled quantity for any purpose. It will be appreciated that the method and apparatus of the present invention is equally applicable to any fuel required.

The various components of this device are B・S・I/I・
Figures 1 and 2 using fluid power symbols by S.O.
As shown in the figure.

Referring now to FIG. 1, the metering chamber 2 is defined by a stationary member 1 and a movable member 3, the movable member being in a free fit within a hole in the stationary member 1. Fuel is taken out of the fuel tank 100 by a low-pressure fuel pump 101, which in combination with a valve device 102 constitutes the fuel delivery device in this example, and is metered through the valve device 102, which is also part of the fuel delivery device. room 2
Fuel inflow port 6 (hereinafter simply "inflow port 6")
). When the metering chamber 2 becomes full, excess fuel is removed from the metering chamber 2 and transferred to the movable member 3.
The fuel flows through the gap between the stationary member 1 and the fuel outflow port 7 (hereinafter simply referred to as "outflow port 7") to the outside, and then returns to the fuel tank 100 through the valve device 103. Movable member 3 for the purpose of preventing leakage
Preferably, a seal 104 is positioned between the stationary member 1 and the stationary member 1 .

High pressure gas is stored in the supply source 105,
The high pressure gas is supplied to a normally closed valve device 106 that is combined with a supply source 105 to constitute the fuel displacement device in this example.
The gas flows into the metering chamber 2 and the gas flows into the movable member 3 through the gas inflow port 14 (hereinafter simply referred to as "gas port 1").
4) is prevented from flowing into the interior. Fuel is prevented from flowing from the metering chamber 2 through the gas port 14 by a normally closed valve arrangement 106. Similarly, the normally closed valve device 107 prevents fuel from flowing to the outside of the metering chamber 2 through the fuel exhaust port 9 (hereinafter simply referred to as "exhaust port 9").

Except during the delivery cycle, the metering chamber 2 is kept filled with fuel by the low-pressure fuel pump 101, and the amount of fuel contained in the metering chamber 2 is controlled by the movable member 3 relative to the stationary member 1. It will be understood that this is determined by the location.

To deliver a metered amount of fuel from the metering chamber 2, the valve devices 102, 103 are closed and no further fuel flows into the metering chamber 2 through the inlet port 6 and the outlet port 7, respectively. This prevents the liquid from being leaked or flowing outside the metering chamber 2. Next, the valve device 10
6, 107 is opened, high-pressure gas from the supply source 105 flows into the metering chamber 2 through the gas port 14, displacing a metered amount of fuel within the metering chamber 2 and exiting through the discharge port 9. , valve device 107 is opened to communicate with pipe 108 . The metered fuel is then injected into appropriate parts of the engine. A sufficient amount of gas must be allowed to flow into the metering chamber 2 to displace the metered fuel, but the amount of gas supplied may exceed this minimum value, and the excess gas at that time is the exhaust port 9 along with the fuel.
is discharged through.

To repeat this cycle, valve arrangement 106,
107 and open the valve devices 102 and 103.
The residual gas in the metering chamber 2 flows through the outflow port 7 and the valve device 1.
03 into the evacuated fuel tank 100, the fuel is again circulated through the metering chamber 2 by the low pressure fuel pump 101, and thus the metering chamber 2.
so that it is filled with fuel. It is normal for the low pressure fuel pump 101 to operate continuously during use of the injector.

The amount of liquid delivered during each cycle is the same as that of the stationary member 1 when the inlet gas port 14 is at the inner end of the movable member 3 and the outlet port 9 is at the opposite end of the metering chamber 2. Controlled by the position of the movable member 3 within the bore, all liquid within the metering chamber 2 will thus be displaced when gas enters through the gas port 14.

However, if the discharge port 9 is provided in a wall of the metering chamber spaced from the end of the metering chamber 2, the amount of liquid discharged through the discharge port 9 will be greater than that of the inlet gas port. It should be understood that this is determined by the volume of liquid in the metering chamber between 14 and discharge port 9. In both of these arrangements, the amount of fuel delivered during each cycle is controlled by the position of the movable member 3. The position of the exhaust port 9 and the position of the inlet gas port 14 are interchanged,
It should also be understood that the exhaust port may thus be provided on the movable member 3 and the gas port for inlet may be provided on the stationary member 1.

Valve device 102, 1, which will be explained with reference to FIG.
03, 106, and 107, as shown in FIG. 2, the air pressure signals transmitted from the control valve device 109 according to the engine cycle and timing opening are applied to each valve device to send it out from the metering position. can be excited to change position. When the control valve device 109 is energized, high pressure gas flows through each valve device 102, 103, 1.
06,107 and the valve device 106,107
is opened, and the valve devices 102, 103 are closed and their positions change from the metering position to the delivery position. When the control valve device 109 returns to its original position, the valve devices 102,
The gas pressure in the control pipes 103, 106, 107 is removed and the valve devices 102, 103 are opened;
On the other hand, valve devices 106 and 107 are closed.

It will be appreciated that some of the valve arrangements described in the foregoing discussion with reference to FIGS. 1 and 2 can be in the form of check valves.

Here, Fig. 3 shows the practical deployment of this device.
The explanation will be made with reference to FIGS. 4 and 5, in which components corresponding to those explained with reference to FIGS. 1 and 2 are indicated by the same reference numerals. .

The device includes a stationary member 1 having a metering chamber 2, a metering cavity, formed generally in the central portion of the stationary body 1. The metering chamber 2 has four independent ports, namely a fuel inlet port 6, a fuel outlet port 7, a gas port 14, and an outlet port 9 as a metering cavity.
Collaborate with. The fuel inflow port 6 is connected to the fuel passage 4,
5, and the fuel passage 4 is adapted to be connected at the surface of the stationary body 1 to a fuel supply source, such as a low pressure pump for delivering fuel from a storage tank. The fuel outlet port 7 communicates with a fuel passage 8, which is again adapted to be connected to a fuel reservoir by a conduit on the surface of the stationary body 1. Therefore, when the inlet port 6 and the outlet port 7 are open, fuel flows from the storage tank to the metering chamber 2, which is the metering cavity.
The fuel is circulated through the fuel passages 4, 5 and the inlet port 6.
It enters the metering chamber through the outlet port 7 and the fuel passage 8.
Exit the metering chamber through the metering cavity.

The fuel inlet port 6 and the fuel outlet port 7 are separate valve elements 2 operated by the same control mechanism.
2, 27. Valve elements 22, 27
are each connected to the ends of rods 21, 26, which rods are connected at their opposite ends to respective control members, diaphragms 19, 24. Individual springs 20 and 25 act through their associated diaphragm and bar for the purpose of holding the valve elements 22, 27 in an open position relative to the inlet port 6, outlet port 7. Fluid pressure can be applied to the diaphragms 19, 24 through the passages 18, 23 to counteract the action of the springs 20, 25, respectively, so that the inlet port 6 and the outlet port 7 are connected to the valve element 2.
Closed by 2,27.

The discharge port 9 has a spring 1 acting through a rod 12.
It is normally closed by a ball valve 10, which is a form of valve element held in the closed position by a valve 3. The diaphragm 30 is connected to the rod 12 so that the ball valve 10 can be moved to open the exhaust port 9 by applying fluid pressure to the control member diaphragm 30 through the port 28.

The movable member 3 is screwed into the stationary member 1, which is the main body, in a coaxial relationship with the metering chamber 2, which is the metering cavity. The movable member 3 is provided with an extension, more particularly a tubular extension 37, which extends into the metering cavity 2 via a suitable seal 41 and which extends into the metering chamber 2 via a suitable seal 41. A gas port 14 for inlet is provided at the lower end of the extension. Valve element 15 closes gas port 14 under the action of a spring 17 which is imparted to valve element 15 through a rod 16 disposed coaxially within tubular extension 37 . As will be explained below, fluid pressure is applied to chamber 35 causing valve element 15 to rise;
A control member, diaphragm 36, is attached to rod 16 to open gas port 14.

The chamber 35 communicates with the chamber 33 via the passage 34, and the chamber 33 conversely communicates with the chamber 31 on the surface of the stationary member 1 which is the main body.
It communicates with a passageway 32 adapted to be connected to a source of high pressure gas at the point. Gas port 14 is connected to rod 1
6 and the tubular extension 37 of the movable member 3 communicates with the chamber 35 via an annular passageway formed between the movable member 3 and the tubular extension 37 of the movable member 3 .

When the movable member 3 rotates while being screwed together with the stationary member 1 serving as the main body, the lower end of the tubular extension portion 37 moves in the axial direction within the metering chamber 2, and the capacity of the metering chamber changes. At the same time, the position of the gas port 14 for the inlet of the metering chamber changes, thus controlling the amount of fuel delivered during each cycle.

The operation of the device described above is as follows.

1 With the fuel inlet port 6 and the fuel outlet port 7 in the normally open state, and the inlet gas port 14 and the exhaust port 9 in the normally closed position, the fuel circulates through the metering chamber, which is the metering cavity. , the metering chamber is maintained filled with fuel.

2. Pressure is applied to each diaphragm 19, 24 to close the fuel inlet port 6 and outlet port 7, so that a quantity of fuel is separated in the metering chamber 2, which is the metering cavity. The quantity varies according to the position of the tubular extension 37 of the movable member 3 within the metering chamber 2, which is the metering cavity.

3. Pressure is also applied to the diaphragms 30, 36 so that the valve element 15 and ball valve 10 move to open the gas port 14 and exhaust port 9, respectively. When the gas port 14 is opened, gas under pressure enters the metering chamber 2 and the liquid in the metering chamber is displaced from the metering chamber via the now open discharge port 9 and thus into the conveying channel 38. Displace through. Therefore, the metered amount of fuel in the metering chamber 2 is transferred to the conveying passage 38.
is transported to the appropriate part of the engine to which it is connected.

4 Next, the gas pressure is increased by the four diaphragms 19, 2
4, 36, and 30, the fuel inflow port 6 and the fuel outflow port 7 are opened, and the gas port 14 is released.
and discharge port 9 are connected to springs 20, 25, 17, respectively.
It is closed by the action of 13.

5 The flow of fuel circulating through the metering chamber 2 is thus again established, gas is removed from the metering chamber and the metering chamber is filled with fuel, and the device is thus set in readiness for the next cycle. be done.

A high pressure pulse of gas exiting the gas port 14 impinges on the stationary fuel in the metering chamber 2, and a certain quantity of fuel is small in the somewhat tortuous path through which both fuel and gas must escape. It will be subdivided into granules. Additionally, if the gas and fuel mixture is allowed to flow into the space where the injection occurs, the fuel will be further atomized. The amount atomized, and therefore the average particle size of the spray produced, is determined by a number of factors, including the ratio of gas to fuel in the spray, the pressure drop created during injection, and the shape of the nozzle producing the spray. Ru.

As previously explained, the amount of fuel displaced from the metering cavity 2 during each conveying operation is varied by adjusting the portion of the movable member 3 within the stationary body 1. Therefore, when the movable member 3 is rotated, the gas port 14, the valve element 15, and the rod 1
The assembly including 6, chamber 35, diaphragm 36, and spring 17 is axially displaced as an integral unit. With this axial displacement, the gas port 1 for inlet
The tubular extension 37 of the movable member with 4 is used for the purpose of varying the amount of fuel admitted into the metering chamber 2, the metering cavity between these two ports, and for metering for conveyance during each conveying cycle. For the purpose of changing the amount of fuel being delivered, it moves toward and away from the discharge port 9 of the stationary member 1, which is the main body.

In the illustrated embodiment, only the seals 40, 41 are in contact with moving components during operation of the device, the movement being that required to effect a quantitative change in the metered fuel. It can be understood that the number of occurrences is relatively small and infrequent.

Adjustment of equivalent or similar components of the movable member 3 or of other structures of the metering device can be effected by electrical or mechanical devices or by fluid pressure. Detection of the need for adjustment and the degree of adjustment can be determined by engine load conditions, pressure conditions in the engine cylinders and/or manifolds, or by direct operator control.

The pressure pulses required to excite the various valve elements and supply gas under pressure to effect injection can be provided by a separate pump with or without an intermediate reservoir. The pump can operate at a pressure high enough to match the pressure requirements of the injector, or it can be a low pressure pump operated in conjunction with a pressure doubler to produce a predetermined operating pressure. Alternatively, the gas under pressure is discharged from the cylinders of the engine at particular times and/or at selected periods during the engine's operating cycle for the purpose of actuating valves and injectors. I can do it. In this case too, the pressure can be supplied directly or through a pressure doubler.

The arrangement of the valve elements in the injector and the mode of operation thereof illustrated in FIGS. 3 to 5 may be varied without departing from the spirit of the invention, and therefore the invention does not cover the particular arrangement shown or the manner of operation thereof. It will be understood that the invention is not limited to mechanisms. By way of example, a valve for controlling the flow of gas under pressure into the metering chamber may be provided in the stationary member 1, and a valve for supplying fuel to the injector may be provided in the movable member 3. It can be installed inside. As another example, all ports and associated valves may be connected to a stationary member 1 that is the main body.
using movable members which are set in fixed relation to each other within the metering cavity and which purely change the volume of liquid that can be displaced from the metering chamber 2 by the inflow of gas into the metering chamber 2. You can also do that.

A system is shown in FIG. 6 in which all ports and associated valves are set in a fixed relationship to each other.

This device has a stationary member 6 which is a main body and has a metering chamber 62 which is a metering cavity formed in the central portion of the device.
Contains 1. The movable member 63 is axially slidable within the stationary member 61 and extends into the metering chamber 62 . Four independent ports, namely an inlet port (fuel inlet port) 66, an outlet port (fuel outlet port) 67, a gas port (gas inlet port) 74, and an outlet port (fuel outlet port) 69, are connected to the metering chamber 62. It's communicating. Fuel inlet port 6
6 is also in communication with the fuel passage 64, and the fuel passage 6
4 is adapted to be connected to a fuel supply source, such as a low pressure pump, for conveying fuel from a storage tank at the surface of the stationary body 61. The fuel outlet port 67 communicates with a fuel passage 68, which is also adapted to be connected to a fuel reservoir by a conduit on the surface of the stationary body member 61. Therefore, the inflow port 66 and the outflow port 67
opens, fuel can be circulated from the storage tank through the metering cavity 62, enters the metering cavity through the fuel passage 64 and the inlet port 66, and enters the metering cavity through the outlet port 67. Fuel can flow out of the metering chamber through the fuel passage 68.

Fuel inlet port 66 and fuel outlet port 67
are controlled by individual valve elements 72, 77 operated by the same control mechanism. Valve element 72, 7
7 are each connected to the ends of rods 71, 76, the opposite ends of which are connected to respective control members, diaphragms 79, 84. individual springs 7
0,75 is its associated diaphragm 79,8
4, acting via rods 71, 76, valve element 72,
77 is held in an open position relative to the inflow port 66 and the outflow port 67. Spring 70, 7 respectively
passages 78, 8 to counteract the action of
3 to the diaphragms 79, 84, so that the inlet port 66, the outlet port 6
7 is closed by valve elements 72,77.

The exhaust port 69 is normally held in the closed position by a spring 93 acting through a rod 92.
Closed by 0. The diaphragm 94, which is a control member, has a port 88, an annular groove 95, and a port 96.
Valve element 90 is connected to rod 92 for movement to open exhaust port 69 by fluid pressure applied to diaphragm 94 through the valve element 90 .

Gas port 74 is normally connected to valve element 85 under the action of spring 87 which is transmitted to valve element 85 through rod 86.
Closed by 5. The diaphragm 89, which is a control member, controls the fluid pressure chamber 8, as will be explained later.
8 is attached to a rod 86 so that the valve element 85 is raised to open the gas port 74.

The chamber 88 communicates with the annular portion 81 via the passage 80, which in turn communicates with the port 82. Port 82 and chamber 88 are connected to passageway 99 via passageway 98 that is out of the plane of the illustrated cross-sectional view;
The passageway 99 is adapted to be connected to a source of high pressure gas at the surface of the stationary body 61. Gas port 74 communicates with port 82 via a passage in annular portion 81 .

The operation of the device described above is as follows.

1 When the fuel inlet port 66 and outlet port 67 are normally open, and the inlet gas port 74 and exhaust port 69 are normally closed, fuel is circulated through the metering chamber, which is a metering cavity. , the metering chamber is maintained filled.

2 Fuel inlet port 66 and fuel outlet port 6
Pressure is applied to each diaphragm 79, 84 in order to close the diaphragm 7, so that a quantity of fuel is accommodated in the metering chamber 62. The amount changes according to the position of the movable member 63 within the metering chamber 62, which is the metering cavity.

3. Pressure is also applied to diaphragms 94, 89 such that valve elements 85, 90 are moved for the purpose of opening gas port 74 and exhaust port 69, respectively. When the gas port 74 is opened, gas under pressure flows into the metering chamber 62 through the annular portion between the movable member 63 and the stationary member 61, and the liquid in the metering chamber is thus removed from the metering chamber. Open exhaust port 6
9, thus being displaced through the fuel passage 65.
The metered amount of fuel in the metering chamber 62 is thus conveyed to the appropriate part of the engine to which the fuel passage 65 is connected.

4 Next, the gas pressure is increased by four diaphragms 79,
84, 89, 94, respectively, and spring 7
0, 75, 87, and 93, the fuel inflow port 66 and outflow port 67 are opened, and the gas port 74 and exhaust port 69 are closed.

5. The circulation of fuel through the metering chamber 62 is thus established again, removing gas from the chamber and filling it with fuel, thereby setting the device in place for the next cycle.

Stationary member 61 which is the main body under the condition that manufacturing technology is used.
It should be understood that actual devices can be introduced between and the movable member 63. Also, the arrangement of the individual ports can be varied and other configurations of the valve mechanism can be used.

The description given previously in connection with the embodiment illustrated in FIGS. 3 to 5 and in connection with the apparatus for effecting the movement of the movable member 3 is similar to the movement of the movable member 63 in the embodiment shown in FIG. The same applies to carrying out. Similarly, the previous discussion regarding the source of pressure pulses for actuating the valve mechanism is applicable to the embodiment shown in FIG.

[Brief explanation of drawings]

FIG. 1 schematically represents a practical application of the method for conveying a controlled amount of fuel. FIG. 2 schematically represents the method illustrated in FIG. 1 with the addition of practical devices for controlling the valves. FIG. 3 is a cross-sectional view of a practical arrangement of a device for delivering regulated quantities of fuel. FIG. 4 is a partial sectional view taken along line 4--4 in FIG. 3. FIG. 5 is an enlarged view of the chamber portion of the apparatus shown in FIG. 3. FIG. 6 is a sectional view of another practical arrangement of a device for conveying metered fuel; Explanation of symbols of main parts, 1... Stationary member, 2...
... Metering chamber, 3... Movable member, 4... Fuel passage, 5
... Fuel passage, 6 ... Inflow port, 7 ... Outflow port, 8 ... Fuel passage, 9 ... Discharge port, 10
... Ball valve, 11 ..., 12 ... Rod, 13 ... Spring, 14 ... Gas port, 15 ... Valve element, 16
...Bar, 17...Spring, 18...Passway, 19...
Diaphragm, 20... Spring, 21... Rod, 22
... Valve element, 23 ... Passage, 24 ... Diaphragm, 25 ... Spring, 26 ... Rod, 27 ... Valve element, 28 ... Port, 29 ..., 30 ... Diaphragm, 31 ... Connection point , 32...Aisle, 33
... Chamber, 34 ... Passage, 61 ... Stationary member, 62
... Metering chamber, 63 ... Movable member, 64 ... Fuel passage, 65 ... Fuel passage, 66 ... Inflow port, 6
7...Outflow port, 68...Fuel passage, 69...
Discharge port, 70... Spring, 71... Rod, 72...
... Valve element, 74 ... Gas port, 75 ... Spring,
76...rod, 77...valve element, 78...passage, 7
9...diaphragm, 80...passage, 81...annular portion, 82...port, 83...passage, 84...
Diaphragm, 85... Valve element, 86... Rod, 8
7... Spring, 88... Chamber, 89... Diaphragm, 90... Valve element, 92... Rod, 93... Spring, 94... Diaphragm, 95... Annular groove, 9
6...port, 98...passage, 99...passage, 1
00...Fuel tank, 101...Low pressure fuel pump, 102...Valve device, 103...Valve device, 10
4... Seal, 105... Supply source, 106... Valve device, 107... Valve device, 108... Pipe, 109
...Control valve device.

Claims (1)

[Claims] 1. Filling a metering chamber with fuel, introducing high-pressure gas into the metering chamber at a pressure sufficient to displace the fuel from the metering chamber, and opening the fuel discharge port of the metering chamber. displacing the fuel from the metering chamber by the high pressure gas admitted into the metering chamber when the metering chamber is selectively opened;
A method for conveying metered fuel to an engine, the method comprising: adjusting the relative positional relationship between the inflow position of high-pressure gas into the metering chamber and the fuel exhaust port; A method for conveying metered fuel, characterized in that the volume of the metering chamber is changed during the metering chamber to control the amount of fuel that can be displaced through the fuel discharge port when the high-pressure gas is introduced into the metering chamber. 2 selectively actuating a fuel inlet port and a fuel outlet port in the metering chamber to effect circulation of fuel through the metering chamber to fill the metering chamber with fuel; A patent characterized in that the high-pressure gas is introduced into the metering chamber through the gas inlet port when the fuel circulation is terminated and the fuel inlet port and the fuel outlet port are closed to terminate the fuel circulation. A metered fuel conveyance method according to claim 1. 3. The filling of the metering chamber with fuel, the introduction of high pressure gas into the metering chamber, and the displacement of fuel from the metering chamber are performed independently of the operation of the metering chamber. A method for conveying metered fuel according to claim 1 or 2. 4 Claims characterized in that the inflow position of the gas into the metering chamber is moved relative to the fuel discharge port to control the amount of fuel that can be displaced from the metering chamber. The metered fuel conveyance method according to item 1 or 2. 5. According to claim 2 or 3, the gas inflow port is moved relative to the fuel discharge port to control the amount of fuel that can be displaced from the metering chamber. The metered fuel conveyance method described. 6. A stationary member 1 which is a device for conveying metered fuel to the engine and has a metering chamber 2 formed therein, a fuel discharge port 9 that communicates with the metering chamber 2 and can be selectively opened. , a fuel inlet port 6 that communicates with the metering chamber 2 and can be selectively opened; and when the fuel exhaust port 9 is closed, fuel is introduced into the metering chamber through the fuel inlet port 6 and the metering is performed. a fuel feed device 101 for filling the chamber with fuel;
102, a gas inflow port 14 communicating with the metering chamber 2, the metering chamber 2 through the gas inflow port 14;
a fuel displacement device 105, 106 that selectively introduces high-pressure gas into the fuel discharge port 9 and displaces the fuel from the metering chamber 2 when the fuel discharge port 9 is opened; Adjust the above gas inflow port 1
The volume of the metering chamber 2 between the metering chamber 4 and the fuel discharge port 9 is changed, so that when high-pressure gas is introduced into the metering chamber 2, the amount of gas flowing from the metering chamber 2 through the fuel discharge port 9 is changed. A metered fuel conveying device characterized by controlling the amount of fuel that can be displaced. 7 An extension portion 37 protrudes into the metering chamber 2,
The extending portion 37 has the gas inlet port 14, and the high pressure gas is arranged to enter the metering chamber 2 through the gas inlet port 14, and the extending portion 37 has the gas inlet port 14. 2 to change the amount of protrusion of the extension portion 37 in the metering chamber 2, thereby changing the volume of the metering chamber 2 between the gas inlet port 14 and the fuel outlet port 9. 7. A metered fuel conveying device according to claim 6, characterized in that it is arranged to change the fuel flow rate. 8 A movable member 3 is provided for controlling the amount of protrusion of the extension portion 37 into the metering chamber 2, so that when the high pressure gas is introduced into the metering chamber 2,
8. The metered fuel conveying device according to claim 7, wherein the amount of fuel that can be displaced from the metering chamber 2 through the fuel discharge port 9 is controlled. 9 The metering chamber 2 is provided with a fuel inlet port and a fuel outlet port 6, 7 that can be selectively opened, and the fuel displacement device 105, 106 for introducing high pressure gas into the metering chamber 2 is configured to Suitable for admitting high pressure gas and displacing fuel by opening the fuel discharge port 9 when the fuel inlet port and the fuel outlet port 6, 7 are closed and the metering chamber 2 is filled with fuel. The metered fuel conveying device according to claim 6, 7, or 8, characterized in that: 10 Each valve element 1 for opening and closing the fuel inlet port and the fuel outlet port 6, 7, the fuel outlet port 9, and the gas inlet port 14
0, 15, 22, and 27 are provided. The metered fuel conveying device according to claim 9. 11 Control members 24, 19, 30, 36 are provided to drive each of the valve elements 10, 15, 22, 27, and the control members 24, 19, 30, 36
drives the valve elements 10, 15, 22, 27,
The gas inflow port 14 and the fuel exhaust port 9
11. The metered fuel conveying device according to claim 10, wherein the fuel inlet port 6 and the fuel outlet port 7 are closed when the fuel inlet port 6 and the fuel outlet port 7 are open. 12 An extension 37 having the gas inlet port 14 is provided, through which high-pressure gas is admitted, the extension 37 is movable with respect to the metering chamber 2 and the fuel The extending portion 37 adjusts the position of the gas inflow port 14 with respect to the discharge port 9 to change the volume of the metering chamber 2 between the ports 9 and 14; The extending portion 37 with respect to the metering chamber 2 A movable member 3 is provided for controlling the position of the movable member 3, thereby adjusting the amount of fuel that can be displaced from the metering chamber 2 through the fuel discharge port 9 when high pressure gas is introduced. The metered fuel conveying device according to claim 6, characterized in that: 13 Fuel feeding devices 101 and 102 are provided to circulate the fuel through the metering chamber 2 and maintain the metering chamber 2 filled with fuel, and to supply the metering chamber 2 filled with fuel. A control device for terminating the above-mentioned circulation of fuel at intervals is provided, and the fuel displacement devices 105 and 106 for introducing high-pressure gas into the metering chamber 2 and displacing the fuel from the metering chamber 2 are used to control the circulation of the fuel. 13. A metered fuel conveying device according to claim 6, characterized in that it is operable during the termination of the period of time.