JPS6056895B2 - fuel injection pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a fuel injection pump device for supplying fuel to an internal combustion engine and an injection nozzle of this type of engine, the invention comprising a piston device housed in a bore and one side of the bore. an outlet from a terminal of
such outlet in communication with an inlet of the nozzle during operation, and an inlet towards said one end of the bore which, during operation, is connected to a source of fuel under pressure)
a valve operable to prevent fuel from flowing through the inlet while fuel is being pumped through the outlet; a reciprocatable plunger contained within a cylinder; and one of the cylinders. a cam device and passage means connecting said one end of the cylinder to the other end of said bore, thereby pressing the plunger in the direction of the end of the plunger while being moved by the plunger; The liquid pushed out acts on the piston device, thereby driving the piston device,
will force fuel through the outlet;
The present invention relates to a device for pumping such fuel injection, which includes such a passage means and a check valve disposed in the passage means to prevent the flow of liquid from the bore into the cylinder.

An example of such a device is shown in the specification of GB 861,754. In this example, delivery of fuel through the outlet occurs at the same location on the cam regardless of the speed of the opposing engine and the amount of fuel being supplied to the engine. Additionally, the system's control over the amount of fuel delivered utilizes a variable orifice that passes fuel into the inlet of the bore to perform the control function. In this case, the means for inducing the flow of fuel into the bore is a spring acting on a piston arrangement.
Adjustment of the timing of fuel delivery is necessary for proper operation of the other engine, and the method of controlling the amount of fuel supplied as described in the above specification is
Yanghe has an advantage because the other engine has a wide speed range. An improved version of this device is British Patent No. 1306.
It is shown in the specification of 42 dirt.

In this case, a solenoid valve is provided to allow liquid to escape from between the plunger and the piston arrangement when the plunger is being moved by the cam. This allows the timing of fuel delivery to be adjusted. Additionally, a solenoid operated valve is also provided to control the amount of fuel supplied to the bore. The control is operated using an adjustable stop that engages the piston to limit the maximum amount of travel of the piston to control the maximum amount of fuel that may be delivered to the engine. ing.

This stop can be adjusted using a rotary solenoid.
The system shown in Specification No. 1306422 has an important advantage over the system in Specification No. 861754 in that it can be controlled electronically, but it does not mention anything about the amount of fuel supplied to the engine. What's more, the system in question is only 3.
Requires multiple solenoid operating devices. The object of the invention is to provide an improvement to a system of the kind known, in which a solenoid-operated valve of the same type is put into practice in order to be able to vary the timing of the delivery of fuel. It is an object of the present invention to provide such an improved system that can be used to provide improved control over the amount of fuel delivered by the device.

A device of this type according to the invention comprises a solenoid control valve operable to allow liquid to flow from the other end of the bore;
a transducer for outputting a signal of the piston device; a control circuit for controlling operation of the valve, the control circuit receiving a signal from the transducer; and the control circuit. a first means for outputting a demand signal to the control circuit; a second means for outputting an engine speed signal to the control circuit;
and third means for outputting an engine position signal to the control circuit, whereby the valve is closed at a certain position while the plunger is being moved by the cam, and a third means is provided for outputting an engine position signal to the control circuit. Fuel is to be delivered at a point in time, and thereby, while injecting fuel into the bore, the valve is closed when the piston arrangement reaches a position that accommodates the amount of fuel being delivered to the engine. That will happen.

BRIEF DESCRIPTION OF THE DRAWINGS: With reference to FIG. 1 of the accompanying drawings, there is provided a piston 10 which is movable in a bore 11 and which is provided with a reduced portion 12; Another piston 13 is arranged in that part, with which the piston 10 engages.

Furthermore, the bore 12 is provided with a valve body 1 having a head 15.
4 is placed. The diameter of the head 15 is larger than the diameter of the body of the valve body and is pressed against a valve seat defined around an enlarged portion 17 of the bore 12 by means of a coiled compression spring 16 . An annular space is defined between the valve body 14 and the enlarged portion 17 of the bore, which space communicates with a source 18 of liquid fuel. Additionally, a longitudinal passage 19 is formed in the body of the valve, which passage communicates with an outlet 20. The outlet 20 communicates with a fuel inlet of a fuel injection nozzle 21, which itself is provided with a spring-loaded valve member 22 for controlling the flow of fuel exiting the outlet 20. The air flows through the outlet orifice 23, which is connected during operation, to the combustion chamber of the other engine. A cylinder 33 is provided and in this cylinder a pumping plunger 24 is arranged which is actuated by a cam 25, which cam 25 is operated at a speed of 112 times the engine speed and It is driven in sync with the engine.

This cylinder is connected via a check valve 35 located in the passage 34 and via a check valve 27 located in the passage 26 to a pressurized state of the fuel supply 28. In this case, it communicates with the bore 11. Fuel injection nozzle 2
1 is provided with a spring, which chamber is preferably connected to a drain and has a space, such as an annular space defined between the piston 13 and the bore 11. ing. The branch passage 29 communicates with the bore 11 and can be placed in communication with a drain by means of a valve 30 which is closed by valve operating means in the form of an electromagnetic device 31.

The valve is closed when the device's solenoid is energized. The current flowing to the device 31 is controlled by the control circuit 3
1a, the control circuit has input signals indicating engine speed, position, actual fuel quantity, and required fuel quantity, as will be explained below. Ru. In FIG. 1, the parts of the apparatus are shown in the positions they each occupy while delivering fuel to a mating engine.

The pumping plunger 24 is moving downwards and the valve 30 is closed, so that the plunger 2
A certain high pressure will exist in the space between 4 and piston 10.

Since the piston 10 has a smaller diameter than the plunger 24, it moves at a greater speed than the plunger 24;
And a similar movement is given to the piston 13. This piston 13 forces the fuel from the bore 12 through the passage 19 to the outlet 20, and the high pressure at the outlet 20 causes the valve member of the injection nozzle to be lifted from its valve seat. By that,
The situation in which fuel begins to flow out through the outlet orifice 23 can be seen. When the cam 25 rotates further,
The piston 13 is brought to such a position that it engages the body of the valve 14, thereby physically lifting the head 15 of that valve from the valve seat.

When such a condition occurs, the pressure at the outlet 20 drops and the valve member 22 of the injection nozzle moves toward its seat, preventing any further flow of fuel through the outlet orifice. Excess fuel displaced from the bore 12 flows toward the fuel supply source 18;
Moreover, the excess fuel pushed out by the plunger 24 is directed to the drain via the boat 36 before the boat 36 is covered by the piston 10. It flows. After the plunger 24 has stopped moving inward and the cam 25 has completed its angular movement, fuel flows from the fuel supply 28 through the check valve 27 and into the air space between the piston 10 and the plunger 24. Place. , and plunger 24 is moved rearward to remain engaged with the cam.

The valve 35 is adjusted so that it cannot be opened by the pressure of the fuel from the fuel supply source 28. The bore 12 is filled with fuel before the next delivery of fuel is required.
It can be done at any convenient time. To fill the valve 30 with fuel, the fuel is supplied from the fuel source 18, through the valve 14, between the head 15 and its seat, through the valve 14 bore 19, and into the bore 12. Let it flow,
Therefore, the pistons 13 and 10 are pushed up. Valve 14 remains in an open piston state while both pistons are moving, since this valve is not pressure balanced. The range of movement of these pistons is sensed using sensing transducers 32 located around the piston 10. A signal from the sensing coil of this transducer indicates that the pistons 13 and 10 have moved in a direction opposite that of the direction in which the pistons 13 and 10 are moving while a sufficient amount of fuel is being delivered. As soon as the valve 30 is closed, and
The pressure in the bore 11 and that part of the cylinder between the piston 10 and the plunger 24 increases to a pressure above the drain pressure, so that the pressure in the bore 12 also increases. This increase in pressure causes valve 14 to close and no more fuel flows into bore 12. The plunger 24 begins to move under the action of the cam 25,
When pressure begins to develop between the piston 10 and the plunger 24, the valve 30 is opened and fuel flows out from between the plunger 24 and the piston 10.

The time when the valve 30 is opened can be changed by the speed.
Thereby, the pressure between the piston 10 and the plunger 24 is sufficiently high to prevent the pressure of the fuel in the fuel supply 18 from closing the valve 14 and forcing the pistons 10 and 13 upwardly. so you can be sure. Piston 10 will not move at all until valve 30 is closed. The subsequent operations are repetitions of the operations described above. By momentarily closing the valve 30, it is sufficient to move the pistons 10 and 13 a little, and by such an operation a pilot injection of fuel can be effected.

Referring now to FIG. 2, a control circuit 31a is shown.

A part forming this circuit is a drive circuit 39 for the electromagnetic device 31, and this drive circuit is controlled by a logic circuit 40. The logic circuit 40 receives four types of control signals, of which the first control signal is output by a comparator 41 that combines the required fuel signal and the transducer 32 signal. A comparison is made with the actual fuel signal taken from the coil via buffer circuit 42. The required fuel signal is output by a governor circuit 43, which receives the requested fuel signal from a transducer 44, which may e.g. It can be linked with the throttle pedal of a vehicle driven by a side engine. To determine the required fuel signal, the governor circuit is also input with a signal indicative of the speed of the companion engine. An example of this signal is the flywheel of an engine;
The rotation of the rotating parts of such an engine is obtained at predetermined time intervals from a circuit 45 receiving pulses thereof. These pulses are output by transducer 46. The governor circuit can also receive such other signals, temperature being an example, and its output, which is the signal for the required fuel, will never exceed the maximum permissible engine speed. I don't think so.
It is also regulated so that the maximum fuel level is never exceeded.

The signal output by comparator 41 to a logic circuit determines the point at which valve 30 is closed to stop movement of pistons 10 and 13 during fuel filling.

The second signal given to the logic circuit is supplied to the timing circuit 47.
outputs.

This signal also functions to close valve 30, which causes movement of pistons 10 and 30 during the fuel delivery cycle. In other words, the timing circuit determines when to supply fuel to the mating engine. The timing circuit receives the required fuel signal, the speed signal, and also the engine position signal. A third signal provided to logic circuit 40 is output by timing circuit 48 and thereby causes valve 30 to initiate a fuel fill cycle.
It outputs a signal that enlightens the world. Although it has been stated that filling the bore 12 with fuel can be done at any time during the next fuel delivery cycle, it is best to fill the bore 12 with fuel as late as possible before the point at which fuel delivery is required. Should.

Experience has shown that by doing so, the regulating effect is improved. As with timing circuit 47, timing circuit 48 receives engine position and engine speed signals. The engine speed signal is
This is necessary to accommodate the fact that the time during which fuel fill occurs becomes shorter as engine speed increases.
The timing circuit 48 also receives a required amount signal since the time required to reliably fill the bore 12 with fuel depends on the amount of fuel required. The fourth signal given to the logic circuit 40 is outputted by the timing circuit 49, and this signal outputted by this circuit causes the plunger 24 to move to the cam 25.
When moved by the pistons 10 and 1
The valve 30 is closed to prevent the movement of the valve 3.

This circuit 49 receives an engine position signal and a speed signal. The speed signal is necessary to compensate for the delay between the time of its input to the logic circuit and the time of opening of the valve 30. The operation of valve 30 at this point is critical. That is valve 3
If the valve opens too early, the pistons 10 and 13 will begin to move in a direction that allows more fuel to enter the bore 12, and if the valve opens too late, both pistons will begin to move in a direction that allows more fuel to enter the bore 12. This is because there is a risk of movement in the direction of. The illustrated circuit 49 also receives a required fuel signal as it affects the amount of fuel stored in the bore 11 at that point in time when the valve 30 must be engaged. Ru. Timing circuit 47, 48
, and 49 determine when to output an output signal from them, depending on the inputs given to them. For this purpose, the desired time point can be calculated, taking into account the response delay of the valve, or it can be in the form of a one-timing map containing stored information. If pilot injection is required, the timing circuit 47 is modified to have the ability to output an initial valve closing signal, after which the valve is opened and then the main closing signal is output. All you have to do is output the signal.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing one embodiment of the device according to the present invention;
FIG. 2 is a block diagram of a part of the system of FIG. 1. Codes in the figure: 10...Zeston, 11...Bore, 12...
・・Reduced part (bore), 13・・Zeston, 14・・
Valve body (valve), 18... Fuel supply source, 19... Longitudinal passage (bore), 20... Outlet, 21...
...Fuel injection nozzle, 22...Valve member (with spring),
23... Orifice, 24... Plunger (for pump), 25... Cam, 26... Passage, 27... Check valve, 28... Fuel supply source, 29... Branch passage ,3
0... Valve, 31... Electromagnetic device (solenoid control valve, solenoid operating valve), 31a... Control circuit, 32...
...Sensing transducer, 33...Cylinder, 3
4... Passage, 35... Check valve, 36... Boat (relief boat), 39... Drive circuit, 40... Logic circuit, 41... Comparator, 42... Buffer circuit ,
44...Transducer, 45,46...Circuit,
47, 48, 49...timing circuit (first, second,
3rd).

Claims (1)

[Claims] 1. A piston device contained within a bore, and an outlet from one end of said bore that communicates with an inlet of a nozzle during operation, and an outlet that communicates with a pressurized fuel supply during operation. an inlet toward said one end of the bore; a valve operable to prevent fuel from flowing through said inlet while fuel is being pumped through said outlet; and a reciprocating valve contained within a cylinder. a cam device for pushing the plunger toward one end of the cylinder, and a liquid pushed out while the plunger is being moved by the cam acts on the piston device to drive the piston device. passage means connecting the one end of the cylinder to the other end of the bore, the passage means being configured to force fuel through an outlet; a check valve for blocking, an operable solenoid control valve adapted to allow liquid to flow from the other end of the bore, a transducer for generating a signal indicative of the position of the piston arrangement, and a signal from the transducer. a first means for outputting a demand signal to the control circuit; a second means for outputting an engine speed signal to the control circuit; and third means for outputting an engine position signal to the control circuit, whereby the valve is closed at a position while the plunger is moved by the cam and the fuel is turned off at a desired point. is to be delivered and thereby, while fuel is being poured into the bore, when the piston arrangement reaches a position that accommodates the amount of fuel being delivered to the engine;
A fuel injection pump device for supplying fuel to an injection nozzle of an internal combustion engine with the valve closed. 2, an inlet for introducing fuel into the one end of the cylinder, and a check valve provided in the inlet, the inlet being connected to a pressurized fuel supply source during operation; 2. A fuel injection pump arrangement according to claim 1, wherein the plunger is forced into contact with the cam when the check valve in the passage means is closed. 3. A relief port provided in a wall portion of the bore, the relief port being operated by the piston device at a predetermined position while the piston device is moving toward the one end of the bore. Claims 1 or 2 encompassing such relief ports that are uncovered.
The fuel injection pump device described in . 4. The control circuit receives the demand signal and the engine speed signal and includes a governor circuit that provides an output in lieu of the required fuel signal and a governor circuit that provides an output in lieu of the required fuel signal. and a comparator outputting a signal in comparison with the signal from the transducer to ensure that the valve closes when the required amount of fuel flows into the bore. The fuel injection pump device described in . 5 including first, second, and third timing circuits that receive the engine position signal, and wherein the first timing circuit receives a signal that causes the valve to close to cause fuel to be pumped through the outlet. The second timing circuit outputs a signal to open the valve to allow fuel to flow into the bore, and the third timing circuit outputs a signal to open the valve to allow fuel to flow into the bore, and the third timing circuit outputs a signal to open the valve to allow fuel to flow into the bore. 5. The fuel injection pump device according to claim 4, which outputs a signal for opening the valve when the device is moved toward the one terminal. 6 the first timing circuit receives a required fuel signal from a governor circuit and also receives an engine speed signal, and wherein the first timing circuit receives a required fuel signal from a governor circuit; 6. A fuel injection pump arrangement according to claim 5, which determines the instant. 7. The second timing circuit receives an engine speed signal and a required fuel signal, and wherein the second timing circuit varies the instant at which the valve is opened to cause the bore to be supplied with fuel. 7. A fuel injection pump arrangement as claimed in claim 6, which ensures the setting of a suitable point in time for causing the required amount of fuel to flow into the bore. 8. Claim 7, wherein said third timing circuit receives an engine speed signal and a required fuel signal.
The fuel injection pump device described in . 9 Output from the comparator and the first
, second, and third timing circuits are supplied to a logic circuit, and the output of the logic circuit controls the operation of the drive circuit. pump equipment.