JPH0320576B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a fuel injection amount adjusting device for a supercharged internal combustion engine in which each cylinder is provided with an injection pump, and a fuel injection amount adjusting device for adjusting the injection amount of these injection pumps. A control link is provided in the control link, and a power booster integrated in the hydraulic control circuit is inserted between the control link and the speed governor, the control piston of the power booster being connected via a driving body. The control piston itself is connected to and adjustable by a transmission member arranged after the speed governor, and the control piston itself determines the position of the working piston of the power multiplier and thus of the adjusting link connected thereto. It relates to things that are designed to be used.

A fuel injection amount adjusting device of this type is shown in FIG. 1 and is well known. In this case, an adjustment link is provided to adjust the injection amount of the injection pump provided for each cylinder of the internal combustion engine, and a hydraulic control link is provided between the adjustment link and the speed governor. A power booster integrated into the circuit is inserted. The power intensifier has an axially movable control piston,
It is connected via a driver to a transmission element located behind the governor and can be adjusted by this, the control piston itself being able to control the position of the working piston and thus of the adjusting link connected to it. Determine.

A disadvantage of such a known fuel injection quantity control device, as shown in FIG. Due to the fact that the air quantities are not supplied at the same time, the mixture becomes rich, which results in smoke containing a large amount of harmful substances and unburned fuel. SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve the above-mentioned known fuel injection amount control device in order to comply with strict regulations regarding environmental pollution, and to prevent the mixture from becoming excessively rich and resulting in the generation of strong smoke. The objective is to ensure that this is avoided and that the internal combustion engine nevertheless still has good acceleration performance.

The configuration of the present invention for achieving this object is as described in claim 1. Advantageous embodiments of the invention are described in the subclaims.

As can be seen from FIGS. 2 and 3, the construction of the present invention is relatively simple and inexpensive, and in particular, it is extremely important that no changes are required to existing adjustment links and power amplifiers. This is an advantage.
In the existing fuel injection amount adjusting device, only the area of the transmission member is changed. The pressure measuring device itself can be mounted in a predetermined position with respect to the control piston of the intensifier. In the fuel injection amount correction device according to the present invention, when the load on the internal combustion engine increases, the fuel injection amount is adjusted to
If the boost air pressure is increased along a predetermined characteristic curve so as not to exceed the smoke limit of the internal combustion engine, and the governor nevertheless reduces the fuel injection quantity, the booster The control piston of is rigidly connected to the governor. Since the pressure measuring device is connected to the control piston of the intensifier, a relatively small and simple pressure measuring device can be used.

To explain the configuration and advantages of the present invention in more detail with reference to the drawings, an adjustment link 1, whose rear end is only partially shown, is connected to each cylinder of a supercharged internal combustion engine in order to adjust the fuel injection amount. This is commonly provided to a large number of injection pumps (not shown) that are respectively provided for the injection pumps. Adjustment link 1
A power booster 2 is inserted between the speed governor and the speed governor (not shown), and this power booster itself is incorporated in a hydraulic control circuit. The structures of the power booster 2 and the hydraulic control circuit are known and are not limited to any particular structure. Hydraulic control circuits generally have an oil reservoir from which oil is supplied by a feed pump via a supply conduit 3 to the intensifier 2, and the discharged oil is passed from the intensifier through a return conduit. The oil is then returned to the oil storage tank. The power multiplier 2 has a housing 4 , a working piston 5 and a control piston 6 . The part of the working piston 5 inside the casing, which has a larger diameter than the control piston 6, is axially movable in the cylindrical working chamber 7 of the power multiplier 2 between two end positions, these end positions being 4 by the inner surfaces 8, 9 of both end walls 10, 11. Working piston 5
project from each end wall 10, 11 with a coaxial cylindrical projection 12, 13, the outer end of the projection 12 being connected via a coupling device 14 to the rear of the adjusting link 1. The ends are connected. The working piston 5 further has a through hole 1 coaxial with its axis.
5, one end of which is closed by a threaded bolt 16 of the coupling device 14, and a control piston 6 is accommodated in the through hole 15 so as to be axially movable. There is. The end of the control piston 6 projects from a cylindrical projection 13 . The control piston has radial control grooves 17, 18 and 19
These control grooves are supplied with pressure oil through control holes 20, 21 formed in the working piston 6 at right angles to its axis, so that the working piston 5 is connected to the control piston. All movements of 6 are augmented by hydraulic force and follow. The control piston 6 of the power multiplier 2 is connected via a driver 22 arranged at its rear end, in the example shown a cylindrical pin, to a force transmission element 23 and is adjustable by this force transmission element; This determines the position of the working piston 5 and thus the position of the adjusting link 1. The transmission member 23 is rotatably mounted on a shaft 25 fixed to an outer wall 24 of the internal combustion engine, and
It has an operating arm 26 which is connected to an adjusting rod 27 which is axially reciprocated by a speed governor.

As can be seen by comparing the known fuel injection amount adjusting device shown in FIG. 1 with the fuel injection amount adjusting device according to the present invention shown in FIGS. is provided with a fuel injection quantity correction device, which comprises a pressure measuring device 28 with a pressure piston 29 adjustable in relation to the charge air pressure.
and a transmission member 23 between the governor and the control piston 6 of the power multiplier, the control piston 6 being connected to the transmission member 23 via the driver 22 depending on the position of the pressure piston 29. The adjustment distance is set, and the transmission member 23 has a stopper 30 for setting the adjustment distance of the control piston from the governor side, and is movable relative to this stopper and is connected to the driving body 22 by means of a spring. Correction lever 3 crimped
1, which corrector lever adjusts the control piston of the intensifier to the maximum extent possible depending on the adjustment distance set in relation to the charge air pressure by the pressure piston 29 of the pressure measuring device 28. Adjust to .

The pressure measuring device 28, like the booster 2, is fixed to the outer wall 24 of the internal combustion engine by means of screws. The pressure measuring device 28 consists of a rear tip-shaped casing part 32 and a front tip-shaped casing part 33, the front casing part having a fixing holder 34 (FIG. 3) on the outside. . A pressure piston guide sleeve 35 is screwed into the front housing part 33. Furthermore, a flexible diaphragm 36 is clamped in a gas-tight manner between the two housing parts 32, 33, which extends towards the rear and connects the supply conduit 37 (third
Pressure chamber 3 supplied with supercharging air pressure via
8, and its range of movement is squeezed between the pressure plate 39 and the spring guide sleeve 40. In this case, the connection between the pressure plate 39, the diaphragm 36 and the spring guide sleeve 40 is made by a clamping screw 41, which has its head in contact with the outer surface of the pressure plate 39 and which Flexible diaphragm 36 and spring guide sleeve 40
a pressure piston 29 supported by a spring-guided sleeve through a coaxial bore formed in the
It is screwed into the thread of a blind hole formed in the A pressure spring 42 is inserted between the spring guide sleeve 40 and the pressure piston guide sleeve 35, the spring force of which can be adjusted by rotating the pressure piston guide sleeve 35. The front casing interior, which is partitioned by the diaphragm 36 and the front casing part 33, is always connected to the atmosphere by means of an exhaust hole 43. In order to adjust or adjust the basic position of the pressure piston 29, an adjusting screw 45 is screwed into the threaded bore 44 of the rear casing part 32, the end face of which can be tightened with the tightening screw when the pressure piston 29 is in the basic position. 41.

The cylindrical pin forming the driver 22 is fixed with one end on the outside of the intensifier casing 4 in a transverse hole 46 formed in the rear end of the control piston at right angles to the axis of the control piston of the intensifier. and a long hole 4 formed in the pressure piston 29.
The other end is inserted into the elongated hole 4.
7 is parallel to the longitudinal axis of the pressure piston 29, which itself extends axially parallel to and laterally offset from the control piston 6 of the intensifier (see FIG. 3). ). long hole 4
7 is formed on a cylindrical portion of the pressure piston 29 that protrudes from the pressure measuring device 28 toward the power intensifier 2 . The front end 48 of the elongated hole 47 on the side facing the intensifier 2 forms a stop for the cylindrical pin 22, which stop is connected to the pressure measuring device 28.
When the pressure piston 29 of the booster is moved to a maximum in relation to the charge air pressure, the control piston 6 of the booster and thus the adjusting link 1 are adjusted by means of the transmission element to a fuel injection quantity position corresponding to the maximum load of the internal combustion engine. make it possible to be done. The starting position of the stop formed by the front end 48 of the elongated hole 47 can be adjusted steplessly by means of an adjusting screw 45, so that the injection quantity can be modified over the entire load range of the internal combustion engine. or from a certain load range, for example from a load of almost 45% of the total load,
It can also be done for the first time. The latter modification range corresponds to the embodiments of FIGS. 2 and 3. On the right side of Figure 2, the injection amount zero position and
The 45% load position and the maximum position of approximately 110% as well as the stroke H of the pressure piston 29 of the pressure measuring device 28 and thus the range of movement of the front end 48 of the slot 47 are marked. The end 48 controls the adjusting movement of the control piston 6 of the power multiplier via the cylindrical pin 22.

The length of the elongated hole 47 in the pressure piston 29 is such that, in any position of the pressure piston 29, for example in its maximum displacement, the cylindrical pin and thus the adjusting link 1 are able to control the fuel injection. The setting is made to ensure that the amount is returned to the zero position.

In the fuel injection amount correction device according to the present invention,
The transmission element 23 between the adjusting rod 27 and the driver (cylindrical pin) 22 consists of a roller 49 which is rotatably mounted on the shaft 25 and has a stopper 30 with a stopper surface 50. A forming return control lever 51 projects in the radial direction and is immovably fixed. Return control lever 51
is designed with its outer free end in the form of a fork, and in the area of this fork part 52, as shown in FIG. With its stop surface 50, which intersects the partial region, it cooperates with the side of the entrainer 22 facing the intensifier 2 to move the control piston 6 of the intensifier to the zero fuel injection position by means of a return control lever. It is possible to return to the position where the fuel injection amount is decreased from any different arbitrary position. Return control lever 51
In addition to, at one end surface of the transmission member 23,
As part of the fuel injection amount correction device according to the present invention,
A correction lever 31 is arranged. This correction lever is pivotably mounted on the shaft 25, is brought into contact with the roller 49, and has a stop ring 5.
3 prevents it from coming off in the axial direction. The correction lever 31 has one end protruding from the outer periphery of the roller 49 and has a driving surface 54 .
The correcting lever 31 is spring-loaded and, as already mentioned, is movable relative to the return control lever 51 and its stop surface 50, in which case a tension spring 55 with a pre-spring force moves it eccentrically away from the roller 49. The protruding pin 56 and the correction lever 31
, and a pin 57 provided at the free end on the side opposite to the driving surface 54 . By arranging the tension spring 55 in this way,
Torque is always applied to the correction lever 31, and the driving surface 54 of the correction lever 31 is connected to the cylindrical pin 2.
2, which is crimped onto the side of the pressure measuring device 28. In this case, the return force of the tension spring 55 is always set to be smaller than the holding force of the push spring 42 inside the pressure measuring device.

The operation of the device according to the invention is as follows.

During operation of the internal combustion engine, the pressure chamber 38 in the pressure measuring device 28 is continuously supplied with supercharging air pressure. As a result, the pressure piston 29 and thus the front end 48 of the slot 47 occupy a position that is precisely related to the respective charge air pressure. This position simultaneously determines the position of the control piston 6 and the working piston 5 of the power multiplier 2 and thus also of the adjusting link 1.

By the way, when the internal combustion engine is accelerated from a load range of 45% of the full load and operated in a higher load range, the governor increases the fuel injection amount, and as a result, the transmission member 23 is pivoted counterclockwise in the drawing by means of an adjusting rod 27. In this case, the drive body 22, which is clamped between the stop face 50 of the return control lever 51 and the drive face 54 of the correction lever 31, is driven, so that the control piston 6 and the working piston 5 of the power multiplier 2 and thus the adjusting link 1 is moved in the direction of increasing the fuel injection quantity until the entrainer 22 abuts the front end of the elongated hole 47, which is in a predetermined position in relation to the supercharging air pressure. If the above position does not match the position set from the governor side,
The return control lever 51, which is rigidly connected to the roller 49 of the transmission element 23, moves away from the driver 22 and reaches the position set from the governor side, whereas the driver surface 54 of the correction lever 31 , remains in contact with the driver 22 and presses the driver 22 against the front end 28 of the elongated hole 47, creating a force balance between the pulling force of the tension spring 55 and the holding force of the push spring 42. Pressure measuring device 28 until
pressure piston 29 and thus control piston 6.
The working piston 5 and the adjustment link 1 are moved in the direction of increasing the fuel injection amount. As a result, the fuel injection amount is increased, so that a large amount of exhaust energy is supplied to the exhaust turbocharger of the internal combustion engine, and the supercharging air pressure is increased. As the supercharging air pressure increases, the pressure within the pressure chamber 38 of the pressure measuring device 28 increases, and as a result, the pressure piston 29 is also moved further in the direction of increasing the fuel injection amount. As a result, the front end 48 of the elongated hole 47 of the pressure piston 29, which forms the stop for the driver 22, is moved, so that the driver 22 and thus the control piston 6, the working piston 5 and the adjusting link 1 are moved. is the correction lever 31
Adjusted by. This process is performed by the cylindrical pin 22
is carried out until it again contacts the stop surface 50 of the return control lever 51 located at the position set from the speed governor side. This completes the fuel injection amount correction control during this acceleration. In this way, when the load on the internal combustion engine increases, a corrective control related to the boost air pressure is carried out so that the air-fuel mixture does not become too rich, and an increase in the fuel injection amount is reduced by the smoke reduction of the internal combustion engine. This is done in conjunction with the amount and pressure of the supercharging air, depending on the specifications.

If the fuel injection amount is to be reduced by the speed governor in order to operate the internal combustion engine in a load range lower than the respective load range, the entrainer 22 is controlled by a clockwise movement of the transmission member 23. Lever 51
It then slides freely in the elongated hole 47 to reach its new position, and at the same time the control piston 6 and the working piston 5 of the power multiplier 2 as well as the adjusting link 1 are correspondingly controlled back.

Safety measures are taken to enable emergency operation in cases where a very rapid acceleration of the internal combustion engine is required or in the event of a disturbance in the charging system. That is, in the housing part 32 behind the pressure measuring device 28 there is a supply conduit 37 for supercharging air.
In addition to this, another air supply conduit 58 (FIG. 3) is connected, by which the pressure chamber 3 is connected.
8 can be supplied with pressurized air, for example from a starting air cylinder of the internal combustion engine. As a result, the pressure piston 29 is impulsively moved into its maximum travel position, so that the control piston 6 of the booster is immediately sent directly from the governor via the transmission element 23 to the desired maximum fuel injection position. , the adjustment link 1 is also adjusted to the maximum fuel injection quantity position via the working piston 5.

Of course, the present invention is not limited to the illustrated embodiment, but can be implemented in various other ways.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a fuel injection amount adjusting device having a known structure, FIG. 2 is a partially sectional front view of an embodiment of the present invention, and FIG. 3 is an embodiment of the fuel injection amount adjusting device shown in FIG. FIG. 3 is a side view of an example. DESCRIPTION OF SYMBOLS 1... Adjustment link, 2... Power booster, 3... Supply conduit, 4... Casing, 5... Working piston,
6... Control piston, 7... Working chamber, 8 and 9...
...Inner surface, 10 and 11...End wall, 12 and 13...
... protrusion, 14 ... coupling device, 15 ... through hole,
16...Threaded bolt, 17-19...Control groove, 2
0 and 21... control hole, 22... entrainer, 23...
...transmission member, 24...outer wall, 25...shaft, 26...
...Operating arm, 27...Adjustment rod, 28...Pressure measuring device, 29...Pressure piston, 30...Stopper, 31...Correction lever, 32 and 33...Casing part, 34...Fixing holder, 35... Pressure piston guide sleeve, 36... Diaphragm, 37... Supply conduit, 38... Pressure chamber, 39...
...Pressure plate, 40...Spring guide sleeve, 4
1...Tightening screw, 42...Press spring, 43...
...Exhaust hole, 44...Screw hole, 45...Adjustment screw,
46... Horizontal hole, 47... Long hole, 48... End, 4
9...Roller, 50...Stopper surface, 51...Return control lever, 52...Fork portion, 53...Retaining ring, 54...Tracking surface, 55...Tension spring,
56 and 57...pin, 58...air supply conduit.

Claims (1)

[Claims] 1. A fuel injection amount adjustment device for a supercharged internal combustion engine in which each cylinder is provided with an injection pump, and an adjustment link is provided to adjust the injection amount of these injection pumps. A power booster integrated in the hydraulic control circuit is inserted between this adjusting link and the speed governor, and the control piston of this power booster controls the speed governor via a driving body. The control piston itself is connected to a transmission member arranged at the rear of the machine and is adjustable by means of which the control piston itself determines the position of the working piston of the intensifier and thus of the adjustment link connected thereto. In this type, an injection quantity modification device is provided in combination with the booster 2, which modification device comprises a pressure measuring device with a pressure piston 29 adjustable in relation to the charge air pressure. 28 and a transmission member 2 between the control piston 6 of the power multiplier and the speed governor.
3, and the position of the pressure piston 29 sets the adjustment distance of the control piston 6, which is connected via the driver 22 to a transmission member, which adjusts the adjustment distance of the control piston. A stopper 30 for setting from the speed machine side and this stopper 3
a correction lever 31 which is movable relative to 0 and is pressed against the driver 22 by spring force;
The control piston of the intensifier is adjusted by the maximum distance set by the stopper 30 in accordance with the adjustment distance set in relation to the supercharging air pressure by the pressure piston 29 of the booster. A fuel injection amount adjustment device for supercharged internal combustion engines. 2 A pressure measuring device 28 is fixed to the outer wall 24 of the internal combustion engine in the same way as the booster 2, and is connected to the rear cup-shaped casing part 32 and to the external fixing holder 3.
The front tip-shaped casing part 33 with 4
A pressure piston guide sleeve 35 is screwed into the front housing part 33, and a flexible diaphragm 36 is screwed between the two housing parts 32, 33. Toward the rear, the flexible diaphragm delimits a pressure chamber 38 to which supercharged air pressure can be supplied via a supply conduit 37, and limits its range of movement between the pressure plate 39 and the spring guide sleeve 40. A clamping screw 41 is screwed in between and makes this connection with its head in contact with the outer surface of the pressure plate 39, and is formed in the pressure plate, the flexible diaphragm 36 and the spring guide sleeve 40. The spring guide sleeve 40 and the pressure piston guide sleeve 35 are screwed into the threads of a blind hole formed in the pressure piston 29 supported by the spring guide sleeve, through a coaxial hole in the spring guide sleeve 40 and the pressure piston guide sleeve 35. A pressure spring 42 is inserted between the pressure piston and the pressure spring, the spring force of which can be adjusted by means of the pressure piston guide sleeve 35; In order to adjust the basic position of 29, the rear casing part 32
2. The fuel injection device according to claim 1, wherein an adjusting screw 45 is screwed into the screw hole 44 of the fuel injection device, the end face of which is brought into contact with the clamping screw 41 when the pressure piston 29 is in its basic position. Amount control device. 3. The driver 22 is a cylindrical pin which has one end inserted into a transverse hole 46 formed in the rear end of the control piston, at right angles to the axis of the control piston 6 of the intensifier, on the outside of the intensifier casing 4. It is fixed, and the other end protrudes into a long hole 47 formed in the pressure piston 29 of the pressure measuring device 28, and in the same way as the pressure piston 29 of the long hole 47, the pressure intensifier is controlled. 2. A fuel injection amount adjusting device according to claim 1, which extends axially parallel to the piston 6 and offset laterally from the control piston. 4 The front end 48 of the elongated hole 47 on the side facing the intensifier 2 forms a stop for the cylindrical pin, which stops when the pressure piston 29 of the pressure measuring device 28 reaches the supercharging air pressure. A patent which makes it possible for the control piston 6 of the booster and thus the adjusting link 1 to be adjusted by means of a transmission member to a fuel injection quantity position corresponding to the maximum load of the internal combustion engine when the associated maximum displacement is achieved. The fuel injection amount adjusting device according to claim 3. 5. The fuel injection amount adjusting device according to claim 4, wherein the starting position of the stopper formed by the front end 48 of the elongated hole 47 can be adjusted steplessly by the adjusting screw 45. . 6. The length of the elongated hole 47 formed in the pressure piston 29 of the pressure measuring device 28 ensures that the cylindrical pin and therefore the adjustment link 1 are at the zero fuel injection amount position even when the pressure piston 29 is moved to the maximum. The fuel injection amount adjusting device according to claim 3, wherein the fuel injection amount adjusting device is set so that the amount of fuel is returned. 7. The transmission member 23 consists of a roller 49 rotatably mounted on a shaft 25 fixed to the outer wall 24 of the internal combustion engine, which roller has the following features:
an operating arm 26 that projects in the radial direction and is connected to an adjustment rod 27 that is connected to the speed governor;
A return control lever 51, which protrudes in the radial direction at an angle with respect to the operation arm and has a stopper surface 50, is immovably fixed, and a movable correction lever 31 is attached to the return control lever 51. The correction lever is rotatably supported on the shaft 25 at one end surface of the roller 49 and prevented from coming off in the axial direction, and has one end protruding from the outer periphery of the roller 49, and The cylindrical pin is always pressed at one end on the side facing the pressure measuring device 28 by a tension spring 55 with a pre-spring force tensioned between the correcting lever and the roller 49. The fuel injection amount adjusting device according to item 1. 8. The return control lever 51 is configured at its outer free end in the form of a fork, and this fork portion 5
2 across the partial region of the control piston 6 of the intensifier 2 which projects out of the intensifier casing 4 and which cooperates with the side of the driver 22 facing the intensifier 2 and which is operated by the return control lever. 8. The fuel injection amount adjusting device according to claim 7, wherein the control piston 6 can be returned from an arbitrary position different from a zero fuel injection amount position to a position where the fuel injection amount is decreased. 9 Casing part 32 behind the pressure measuring device 28
In addition to the supply line 37 for the charge air pressure, a further air supply line 58 is connected to the rear housing part 32, which supplies pressurized air to the pressure chamber 38 in the rear housing part 32. The fuel injection amount adjusting device according to claim 2, wherein the fuel injection amount adjusting device is configured to be able to perform the following steps.