JPS5920531A - Controller for number of revolution for fuel injection pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention provides a method in which the rotational speed generator is provided with an intermediate lever which acts at least indirectly against the spring force of an adjusting spring mechanism with a rotational speed-related force. The present invention relates to a rotational speed controller for a fuel injection pump of an internal combustion engine, which is operatively connected to a displacement regulating member of the fuel injection pump.

BACKGROUND OF THE INVENTION A speed controller of the above type is already known from German Patent Application No. 2,449,859, in which the idling speed of an internal combustion engine is determined by the initial tension of an idling spring acting on a drag lever. is determined until an adjustable full load stone ξ is reached. Changes in the operating conditions of the internal combustion engine can sometimes affect the idling speed.

This known rotational speed controller does not take such changes into account at all. However, as is well known, for example, when side-bending energy consuming devices driven by an internal combustion engine are connected, such as air conditioning equipment or compressors, the output of the internal combustion engine during idling may change significantly. In order to keep the idling speed constant despite the connection of energy-consuming devices, it is necessary to increase the discharge amount.

Centrifugal speed control of the type that increases the initial tension of the idling spring by an idling correction device loaded by a thermostat in relation to temperature in order to allow the engine to rotate quietly without vibration by about 5Kf when the engine is cold. A device is known from German Patent Application No. 2,644,994. In this known device, extremely high forces must be generated by the thermostat. This is because the idle spring, which determines the idle speed, is already in contact with the adjustable spring support due to the initial tension. After all, such devices work relatively slowly and inertly;
It is not possible to quickly adapt the idling speed to a changed load on the engine. However, this known device has a large variation in rotational speed and is also expensive.

DISCLOSURE OF THE INVENTION The present invention provides an idling speed controller having an adjusting member that acts on a drag lever of a speed generator, the adjusting member making an adjustment corresponding to a control deviation between a target speed and an actual speed. In the direction of using force to increase the discharge amount at idling,
Moreover, the drag lever is loaded until the control deviation becomes zero.

Advantages of the Invention The speed controller of the present invention is simple and robust in construction, and the idling speed can be preselected or fixed, regardless of temperature and/or load. Accurately maintained down to the load amount. The adjusting force exerted by the adjusting member and acting on the drag force, F-, is generated virtually without losses and by very simple means.

Advantageous embodiments of the rotational speed controller according to the invention are possible with the measures described in the subclaims. Such an idling speed controller can be assembled into an existing speed controller without extensive modification. The weight, size and cost of the idle speed controller are relatively low.

By configuring the device as described in claim 3, manufacturing and operating costs are further reduced.

This is because, with this configuration, the member that acts on the drag lever in cooperation with the adjusting member of the idling speed controller is a simple component of the drag solenoid itself, and it is a non-contact system that uses only magnetic flux. This is because there is no connection to the electromagnet caused by an object. In short, the electromagnet can be installed particularly easily and quickly, even if additionally.

The structural means described in claims 4 and 5 make the spatial arrangement relationship between the electromagnet and the connecting part of the Drasogre S-, for example the thin metal plate part, located within the magnetic flux of the electromagnet particularly simple. Furthermore, it is also possible to easily adjust the amount of relative lateral shift between the two. Also, the electromagnet is positioned laterally with respect to the drag lever S-, or conversely, one end of the drag lever that has a connecting part and cooperates with the electromagnet is adjusted with respect to the electromagnet. This is because it will be done.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The pump plunger 3 works within the cylinder hole 2 provided in the casing 1 of the fuel injection pump, and the pump plunger reciprocates against the force of a return spring (not shown) by a mechanism not shown. At the same time, rotational movement is performed. As long as the pump plunger 3 performs its suction stroke and occupies its bottom dead center position, fuel is formed in the suction chamber 7 and in the plurality of longitudinal grooves 5 provided on the circumferential wall of the pump plunger 30 and in the goose song 1. The fuel is supplied to the pump working chamber of the fuel injection pump through a passage 6.

As soon as the passage 6 is closed at the beginning of the compression stroke and after correspondingly pivoting the bonsi plunger 3,
The fuel present in the pump work chamber is pumped into a vertical passage 8 extending into the interior of the bomb plunger 3. The vertical passage 8
From there, the fuel passes through the branched radial holes 9 and the distribution longitudinal groove 10 provided on the outer wall surface of the pump plunger δ, and then enters the discharge conduit 1.
1 of 1 is supplied. The discharge conduit 11 is arranged in a distributed manner on the circumferential wall of the cylinder hole 20 in accordance with the number of engine 7 cylinders to be supplied, and is connected to the internal combustion engine through one check valve 12, which opens in the discharge direction. The individual cylinders reach injection valves (not shown).

The suction chamber 7 is supplied with fuel 1 from a fuel tank 14 via a fuel feed pump 13.The pressure in the suction chamber 7 is controlled in a known manner by a pressure control valve 15 located in parallel to the pump 13. Be controlled by

A ring slide 16 is slidable on the pump plunger δ, which controls the opening of the radial bore 17 communicating with the longitudinal channel 8 during the course of the compression stroke of the pump plunger 3, defines the end of the discharge or the discharge volume which is pumped into the discharge conduit 11 by the pump plunger 3. After the opening control, the fuel flowing out returns into the suction chamber 7.

The ring slide 16 is shifted via an intermediate lever 18 which is pivotable about a pivot shaft 19 fixedly inserted into the goose song 1 and which, at one end, moves the ring slide 16 with a hand 20. It engages within the recess 21.

A centrifugal governor 23 is engaged with the other end of the intermediate lever 18 as a rotational speed it generator. The centrifugal governor 23, which is driven by a transmission (not shown) in accordance with the rotational speed of the pump plunger, has a support 24 on which a plurality of flyweights 25 are arranged. A sleeve 27 is slidably fitted over the central shaft 26 of the centrifugal governor 23, and the protruding portion 28 of the flyweight 25 is engaged with the lowermost end of the sleeve, so that the flyweight When the sleeve 25 swings due to centrifugal force, the sleeve 27
is softened axially along the central axis 26, simultaneously displacing the intermediate lever 18 and the ring slide 16. In order to transmit the adjustment movement of the centrifugal governor 23 as frictionlessly and moment-free as possible, the intermediate valve 5-18 has a hemispherical protrusion 29 at the point of action of the valve 27, or The hemispherical projection is provided on the sleeve 27. A single-arm drag lever 30 is arranged on the same pivot shaft 19 so as to be pivotable independently of the intermediate lever 18. The drag lever 30 is symmetrically supported by π with respect to the intermediate lever 18 and has a notch 31. Since the intermediate lever 18 is inserted into the notch, the intermediate lever ζ-18 and the drag lever 30 are can rotate independently of each other. In short, the ends of both levers overlap.

At the end of the drag lever 30, a main adjustment spring 33 is pivotally attached to the drag lever. For this purpose, one end of the main adjustment spring 33, which is designed as a tension spring, is fastened to a pin 34, which passes through a hole in the drag lever 30 and has a hem 1 on the side opposite the main adjustment spring. It has ゛35. An idling spring 36 may be disposed between the head 35 and the drag lever 130. The other end of the main adjustment spring 33 is hooked onto a lever 37 that can be adjusted arbitrarily.

Both the drag lever 30 and the intermediate lever 18 are bent, so that when they come into contact with each other, a parallelogram-shaped gap is created. In this mutual contact position, the two levers 30, 18 extend substantially parallel to each other. Into the gap between the drag lever 30 and the intermediate lever 18 a coupling member in the form of a leaf spring 39 is introduced, which leaf spring is fixedly connected to the outer end of the drag lever 30 .

The leaf spring 39 is bent approximately from its midpoint towards the centrifugal governor 23 and has an upwardly bent tongue 41 which is connected to the intermediate lever 18. It's on top. The leaf spring 39 has the effect of pushing the two levers 30.18 apart from each other.

The injection amount adjustment operation of the Ail fuel injection pump is as follows. Depending on the position of the ring slide 16, the radial bore 17 is opened sooner or later during the compression stroke or the discharge stroke of the bonsi plunger δ, and thus communication from the pump working chamber to the suction chamber 7 takes place, and accordingly. The fuel supply to the discharge conduit 11 is then interrupted.

In the uppermost position of the ring slide 16, therefore, the maximum amount of fuel pumped by the pump plunger 3 is supplied to the discharge conduit 11. The opening control of the radial hole 17 and the discharge interruption are accelerated according to the amount of downward shift of the ring slide 16. Drag lever 3 in the starting position shown.
0 assumes its starting position, and the intermediate lever 18 is pressed by the leaf spring 39 against the sleeve 27 of the centrifugal governor 23. As a result of the displacement of the intermediate lever 18, the ring slide 16 is simultaneously moved to its uppermost position, which corresponds to the delivery of an excess amount of fuel. Since the flyweight 25 is displaced due to an increase in the rotational speed after starting the internal combustion engine, the sleeve 27 is shifted upward, and as the rotational speed increases, the intermediate reno'-18 resists the force of the leaf spring 39. te dragre/'
Turn until you touch -30.

At the moment of this contact, the excess fuel quantity has been reduced to the normal full load quantity. By the way, in the subsequent process when the rotational speed increases further, the intermediate lever 1δ is rotated together with the drag lever 30 at the latest when the injection amount suppression rotational speed is reached according to the preload of the main adjustment spring 33. Then the ring slide 17 is shifted further downward. In other words, during standard operation, the drag lever 30 and the intermediate lever 18 are constantly in contact with each other.

In this case, the main adjustment spring 33 is only slightly tensioned (for idling operation, the idling spring 36 is first at work, but if the idling speed determined by the tension of the idling spring 36 is exceeded, the idling spring 36 Against this, the drag lever 30 is softened while reducing the injection quantity.After a certain number of revolutions, the idling spring 36 is overcompressed, so that the injection quantity is determined only by the tension of the main adjustment spring 33. do not have.

The adjustment of the desired idling speed is carried out with or without the cooperation of a special idling spring by means of an idling speed controller 42, which on the idling speed side is a displaceable member of the drag lever 30. The end (left end in the drawing) acts at K and the target rotational speed (nSo
The drag lever 30 is loaded in a direction to increase the discharge amount during idling using an adjustment force corresponding to the control deviation between the actual rotation speed (n1st) and the actual rotation speed (n1st). The idling speed controller 42 has a highly simplified control circuit arrangement 50 with a power supply 51 , a speed generator 52 and an electronic comparison circuit 53 as well as a regulator of the idling speed controller 42 . It has an electromagnet 43.

The control circuit device 50 controls the excitation current JE for the electromagnet 43 connected to the comparison circuit 53. Rotation speed generator 52
detects the actual rotational speed n□8□ as the engine operating amount, and the actual rotational speed is compared with a preselected or fixedly set idling target rotational speed “5oll” in the comparison circuit 53. A proportional excitation current JE is generated as a direct result of the control deviation and is supplied to the winding of the electromagnet 43.

The electromagnet 43 is spatially adjacent to the magnetically acting connecting portion 44 of the drag lever 30K, but is arranged with a gap therebetween, and furthermore, the magnetic flux is connected to the connecting portion 44.
It is set to move to 4. The connecting portion 44 consists of a tongue-shaped piece bent at the left end of the drag lever 30.

In this case, the drag lever 30 or the connecting portion 44 is
It is made of a magnetically active material, but is not permanently magnetizable. However, if corresponding adaptation measures can be taken, the connecting part 44 can also consist of a permanent magnet with defined polarity, which is in a corresponding relationship to the particular magnetic field shape of the electromagnet 43. The electromagnet 43 is arranged with its vertical axis perpendicular to the connecting part 44 and shifted laterally, and is based on the magnetic flux acting on the connecting part 44 as the winding of the electromagnet 43 is excited. The drag lever 30 is arranged so as to be movable from the illustrated position in a direction to increase the discharge amount during idling, that is, to move the left end of the drag lever downward and move the ring slide 16 upward.

In this way, additionally connected energy-consuming equipment driven by an internal combustion engine, such as an air conditioning system, for example,
It is possible to keep the detriling rotational speed of the internal combustion engine constant regardless of the load and/or temperature of the internal combustion engine due to the compressor, lighting generator, etc.

If such auxiliary energy-consuming devices are additionally driven by the internal combustion engine, the idling power of the internal combustion engine may vary considerably. Still, for example, when the internal combustion engine is cold, the standard normal position may not be sufficient to supply the engine with a displacement that is adequate to the idling speed. In short, for example, if the operating temperature falls below a predetermined temperature limit range, or if an auxiliary energy-consuming device driven by an internal combustion engine is connected, the control circuit arrangement 50 applies a corresponding excitation current IE to the windings of the electromagnet 43. will be given to Based on the fact that the electromagnet 43 is disposed laterally with respect to the connecting portion 44 located within the magnetic field, the electromagnet exerts a magnetic force on the drag lever 30, and this magnetic force causes the left end of the drag lever 30 to move around the pivot axis 19. The center moves downward. As a result, the discharge amount during idling is increased via the ring slide 16. For example, if the temperature of the internal combustion engine increases, or if an auxiliary energy-consuming device driven by the internal combustion engine is disconnected, the comparator circuit 53 causes the excitation current to be weakened.
E is supplied to the electromagnet 43, and accordingly, the position of the drug renonie 30, which has been affected so far, changes. In this case, the adjustment effect of the drag lever 30 obtained by the electromagnet 43 continues until the difference between the target rotational speed determined by the comparison circuit 53 and the actual rotational speed is eliminated. The idle speed controller 42 described above is extremely simple and robust. The preselected or specified idling target speed is maintained precisely up to the full load, regardless of the temperature and/or load of the internal combustion engine.

If the temperature is still low, for example, the target idling speed n
It is also possible to increase the setting value of 5ol (!).In order to avoid this, the idling speed controller 42 can have a target pupil regulator 54 acting on the comparison circuit 53, which target pupil regulator For example, it can be connected by a switch that can be actuated by the operator.Alternatively, it is also advantageous if the target pupil adjuster 54 can be connected automatically in relation to an operating parameter of the internal combustion engine, such as the coolant temperature. be.

[Brief explanation of drawings]

The drawing is a schematic cross-sectional view showing a part of the rotation speed controller for a fuel injection pump in a side view and a block diagram. Pump work chamber, 5... Vertical groove, 6.
- Passage, 7 Suction chamber, 8... Vertical passage, 9... Radial hole, 10 Distribution vertical groove, 11 - Discharge conduit, 12 - Reverse valve, ■3 Fuel feed pump, 14 Fuel tank, 15
・・Pressure control valve, 16・Ringes slide, 17・・Radial hole, 18 Intermediate V par, 19 Swivel axis, 20-head, 21・Recess, 23・Centrifugal governor, 24 Support, 25 Flyweight, 26・Central shaft, 27 Sleeve, 28・Protrusion-shaped portion, 29 Hemispherical projection, 30...
・Drag lever, 31... Notch, 33. Main adjustment spring, 34. Pin, 35. Head, 36. Idling spring, 37. Leno-139.. Leaf spring, 41... Tongue-shaped end. Part, 42... Idling speed controller, 43...
Electromagnet, 44...connection part, 50...control circuit device,
51...Power source, 52...Rotation speed generator, 53...Comparison circuit, 54-Target value adjuster

Claims (1)

Claims: 1. The rotational speed generator (23) is provided with an intermediate lever (18) which acts at least indirectly against the spring force of the adjusting spring mechanism with a rotational speed-related force; of the type in which it is operatively connected to the discharge rate adjusting member (16) of the fuel injection pump. In the rotation speed controller for the fuel injection pump of an internal combustion engine,
The idling speed controller (42) is connected to the speed generator (
It has an adjustment member (43) that acts on the Dranogre 6-(30) of 23), and the adjustment member has a target rotation speed (nSol
The drag lever (30) is moved in a direction to increase the discharge amount at idling by using an adjustment force corresponding to the control deviation between the actual rotation speed (nISI) and the actual rotation speed (nISI, ) until the control deviation becomes zero. A rotation speed controller for a fuel injection pump, which is characterized by being loaded. 2. The fitting rotation speed controller (42) includes an electronic comparator circuit (53) and an electromagnet (which constitutes the adjustment member) to which the excitation current (1E) is supplied from the comparator circuit (53).
43) and a control circuit device (50),
A rotation speed controller according to claim 1. 3. The electromagnet (43) is spaced apart from and spatially adjacent to the magnetically operating connecting part (44) provided in the F Landerle 5-(30), and arranged to transfer magnetic flux to the connecting portion;
A rotation speed controller according to claim 2. The rotational speed controller according to claim 2 or 3, wherein the connecting portion (44) consists of a tongue-like piece bent at the end of the drag lever (30). 5. The electromagnet (43) is arranged with its vertical axis perpendicular to the connecting part (44) and shifted laterally,
With the excitation of the electromagnet (43), the connecting portion (4
4) The rotation speed control according to any one of claims 2 to 4, wherein the drag lever (3o) is configured to be movable in a direction to increase the discharge amount during idling by the magnetic flux acting on the rotation speed control. vessel. 6. The idling speed controller (42) has an adjustable target speed adjuster (54) that presets the target speed (nSOll), and the idling speed controller (42) has an adjustable target speed adjuster (54) that controls the target speed (direction adjuster) in a direction that particularly increases the set target speed. 7. The rotation speed controller according to any one of claims 1 to 5, which is configured such that the target speed regulator (54) is controlled by a manually operable switch or by an internal combustion engine. ξ, operating temperature such as cooling water temperature
7. The rotation speed controller according to claim 6, wherein the rotation speed controller is automatically connected in relation to the rotation speed controller.