JPH03156130A - Output increase device of engine with supercharger - Google Patents

Abstract

PURPOSE:To secure acceleration performance with good response by providing a second face cam having a lift function based on the supercharging characteristic at the sudden acceleration time of an engine, and providing a control means which selects a second face cam. CONSTITUTION:When an engine speed reaches boost pressure generation revolutions of a supercharger, the supercharge pressure is generated and an engine is supercharged. At the normal operation time of the engine, the supercharge pressure is actuated to a boost compensator 6. Positions of a diaphragm 10 and a fuel fluid adjustment pin 12 are adjusted according to increase/decrease of the supercharging pressure, and required fluid fuel is supplied to the engine based on the lift of a face cam 21 for normal operation. At the sudden acceleration time of the engine, a sudden acceleration control means 23 is actuated, and varied fuel fluid based on the lift of the face cam 22 for sudden acceleration, and response is improved by increasing engine speed instantaneously.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a supercharged engine, and particularly to a supercharged engine that increases the amount of fuel injection during sudden acceleration to increase the engine output during sudden acceleration. The present invention relates to an output increasing device for a fed engine.

[Prior Art] Generally, in a supercharged engine, since the excess air ratio is greatly improved, the fuel injection amount can be increased by a considerable amount in terms of the smoke limit.

However, if the fuel injection amount is significantly increased during normal operation, the thermal load and mechanical load will become too large, leading to engine damage, so a boost convencator is attached to the fuel injection pump that supplies fuel to the engine. The amount is limited and the upper limit of boost pressure is regulated.

Conventionally, as shown in Figure 10, a boost convencator is used to store boost pressure (supercharging pressure) increased by the operation of a supercharger.
is introduced into the positive pressure chamber a, and pushes down the diaphragm C and the fuel flow rate adjustment pin d connected thereto against the return spring b. As a result, the boost convencator lever f, which moves along the tapered portion e of the fuel flow rate adjustment bin d, is rotated to the left in the figure. This rotation causes the tension lever h of the governor g to rotate clockwise to move the control sleeve i to the left, thereby increasing the fuel injection amount. In addition, the biasing force of the return spring b and the fuel flow rate adjustment bin should be adjusted so that the upper limit of the fuel injection amount due to the increase in boost pressure is quite low considering the thermal load and mechanical load during normal operation. The taper angle of d is set.

However, in the above technology, the fuel flow rate when the engine suddenly accelerates changes according to O-0, -B shown in FIG.
There was a problem that poor response occurred. In other words, when the accelerator pedal is depressed, the fuel flow rate is increased to the fuel flow rate NAQ before no boost pressure was generated (between 0 and 0) corresponding to that time, and then the supercharger increases the boost pressure until no boost pressure is generated. Since the fuel flow rate is increased (between 0. and B) based on Put it away.

If the NAQ is increased in an attempt to eliminate poor response, another problem will occur: the fuel flow rate will become excessive relative to the amount of intake air at low boost pressures and high loads, worsening smoke and worsening fuel efficiency.

As a proposal to address these problems,
There is a publication No. 43140. As shown in Fig. 12, this is done by operating the electromagnetic switching valve j during acceleration to introduce air from the pneumatic tank into the positive pressure chamber A of the boost compensator, and turning the supercharging lever m and rack rod n to increase fuel. It is meant to move you in the same direction.

[Problems to be Solved by the Invention] However, as shown in FIG. 13, this conventional technology increases the fuel injection amount at the initial stage of acceleration (between Ol and 02) based on the air pressure value in the pneumatic tank. Therefore, if the air pressure value is too high, the smoke will worsen at the beginning of acceleration, and if the air pressure value is below the smoke tolerance, the smoke will worsen. There is no deterioration, and the response at the beginning of acceleration is improved, but after that (between 02-A-B), the turbo lag lags as described above, and it becomes impossible to obtain a sufficient response.

The present invention solves the above-mentioned drawbacks of the prior art and provides an output increase device for a supercharged engine that temporarily sets the fuel injection amount to a high level during sudden acceleration to exhibit responsive acceleration performance. purpose.

Means for Solving the Problems] In order to achieve the above object, the present invention provides a first face of a boost based on supercharging characteristics during normal operation to an In member integrally attached to a diaphragm of a boost compensator. cam and the second lift based on the supercharging characteristics during sudden acceleration of the engine.
The engine is equipped with face cams, a push rod that selectively engages with these face cams to operate a boost convencator lever, and a control means that selects the second face cam when the engine suddenly accelerates.

[Operation] When the engine speed reaches the boost pressure generation speed of the supercharger, supercharging pressure is generated and the engine is supercharged. During normal operation of the engine, the boost pressure acts on the boost compensator, which adjusts the position of the diaphragm and control member according to the increase or decrease in boost pressure, and provides the desired flow rate to the engine based on the elevation of the first face cam. Supply fuel. When the engine suddenly accelerates, the control means operates to change the fuel flow rate based on the elevation of the second face cam, and the engine rotational speed is instantly increased to improve response.

[Embodiment] A preferred embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 2 is a system diagram of a turbocharged engine according to the present invention.

As shown in the figure, the supercharged engine 1 is configured by providing a turbo supercharger 4 (hereinafter referred to as a supercharger) between an exhaust system 2 and an intake system 3. The supercharger 8!4 is driven by exhaust energy and supplies high-pressure superintake air to the engine 1 via the intake system 3. The rotational speed of the engine 1 is controlled by a fuel injection pump 5 that adjusts the flow rate of fuel supplied to the engine 1.

A boost convencator 6 is attached to the fuel injection pump 5 for controlling the fuel injection amount according to the degree of boost pressure generation in the intake system 3. As shown in FIGS. 1 and 2, the boost compensator 6 includes a positive pressure chamber 7 that is connected to the intake system 3, an operating chamber that has a return spring (bucon spring) 8, and a working chamber that is connected to the intake system 3. A diaphragm 10 that partitions the positive pressure chamber 7 and the working chamber 9; a fuel flow IL adjustment bin 12 (control member) directly connected to the diaphragm 10 via a diaphragm iron 11; A connecting bin 14 that rotates the boost convencator lever 13 of the injection pump 5
Normally, the fuel flow rate adjustment pin 12 is pushed upward (towards the positive pressure chamber 71111) by the return spring 8. However, when the supercharging #R71 operates and the supercharging pressure increases, the supercharging pressure is introduced into the positive pressure chamber 7, so the fuel flow rate adjustment pin 12 moves downward (in the working chamber) against the return spring 8. 9 side). As a result, the boost convencator lever 13, which moves in accordance with the groove of the fuel flow rate adjustment pin 12, is rotated as shown in FIG. 2, and the tension lever 17, which is connected to the throttle lever 15 via the governor spring 16, is rotated counterclockwise. control sleeve 18
This will increase the amount of fuel fired per meter by moving it to the right.

Now, the purpose of this invention is to improve the rapid acceleration performance of the engine 1.

Therefore, in this embodiment, as shown in FIG.
, normal operation face cams 2 extending adjacent to each other from the base portion 20 of the amount adjustment bottle 12 along the direction of movement thereof.
1 and a face cam 22 for rapid acceleration. Here, the normal operation face cam 21 is formed with a profile corresponding to the increase in injection amount during normal acceleration. That is, in consideration of the thermal load and mechanical load of the engine 1, the height is formed so that the fuel flow rate can be increased at a substantially uniform rate with respect to the downward movement of the adjustment pin 12. On the other hand, the sudden acceleration face cam 22 has a profile formed to correspond to an increase in injection amount during sudden acceleration, and has a first surface 22a formed with a larger elevation than the normal operation face cam 21;
The second surface 22b has a smaller elevation than the first surface 22a, the third surface 22C1 has almost no elevation, and the fourth surface 22d has approximately the same elevation as the guide surface 21. are doing.

Further, in this embodiment, in order to achieve the above object, a control means 23 is provided which selects the sudden acceleration face cam 22 to increase the fuel injection amount when the engine 1 suddenly accelerates.

As shown in FIGS. 4 to 6, the control means 23 includes a selection means 24 for selecting engagement of the connecting bin 14 with each face cam 2122, and a selection means 24 for selecting engagement of the connecting pin 14 with each face cam 2122, and a selection means 24 for lowering the adjustment pin 12 by a predetermined amount to forcibly lower the adjustment pin 12 by a predetermined amount. output adjustment means 25 for increasing the fuel injection amount; and selection means 2 for detecting sudden acceleration of the engine 1.
4 and an actuating means 26 for actuating the output adjusting means 25. As shown in FIG. tin ring 29° electromagnet 3 provided in the housing 27
It has 0 etc. In this way, by turning on and off the electromagnet 30, the guide piece 28 is attracted or the attraction is released, and the connection of the connecting pin 14 to each face cam 21, 22 is switched. .

Further, as shown in FIG.
It consists of an electromagnet attached to 7, and by turning on this electromagnet 25, its attractive force and return spring 8
As shown in FIG. 6, the six actuating means 26 forcibly lower the adjustment pin 12 to a position where the biasing force of
It is connected to a battery 33 via a sudden acceleration switch 32 that is linked to the depression of the accelerator pedal 31, and when the sudden acceleration switch 32 is closed during full acceleration, both magnets 25° and 30 are turned on (energized). It looks like this.

Next, the operation of this embodiment will be explained.

If the engine 1 is to be accelerated during normal operation, the acceleration will be performed without the sudden acceleration switch 32 being closed. In other words, the OFF state of the electromagnet 2530 is ensured and the control means 23 is not activated. Therefore, when the boost pressure increases due to the normal acceleration signal (FIG. 7(a)), the boost pressure is introduced into the positive pressure chamber 7 of the boost convencator 6, and as the boost pressure increases, the fuel flow rate adjustment pin 12 is lowered (FIG. 7fc)).Then, the adjusting pin 14 is moved to the normal operation face. While in contact with the cam 21, the boost convencator lever 13 is rotated into the middle of FIG. 1 according to its profile. and,
By rotating the tension lever 17 to the right and moving the control sleeve 18 to the left (in the direction of increasing fuel 1), the amount of fuel injected from the fuel injection pump 5 is increased (Fig. 7 (cl), for normal operation). As described above, the profile of the face cam 21 is formed taking into account the thermal load and v1 mechanical load of the engine 1, so the fuel injection amount is determined by the curve 0+A-E in FIG. 9, as in the conventional case. -B will increase along.

On the other hand, when the engine 1 suddenly accelerates, the accelerator pedal 31
By pressing the button, the sudden acceleration switch 32 is closed (FIG. 7(b)), and the control means 23 is activated. That is, the electromagnet 30 of the selection means 24 and the electromagnet 25 as the output adjustment means are turned on (FIG. 7 (Ch)), and the adjusting bin 14 is attracted and moved in the direction in which it comes into contact with the rapid acceleration face cam 22, At the same time, the fuel flow rate adjustment pin 12 is suctioned and moved downward by the section △ shown in FIG. 8(b) (see FIG. 7(
d)) Then, while the adjusting pin 14 comes into contact with the sudden acceleration face cam 22, the adjusting pin 12ff! J
and remove the control sleeve 18 in the same manner as described above.
will move in the direction of fuel increase (Figure 7(e)),
Here, the first surface 22a and the second surface 22b of the face cam 22 for rapid acceleration are formed with a larger elevation than the face cam 21 for normal operation. Therefore, when the control means 23 operates, the fuel injection amount is increased at a larger rate than during normal operation, that is, the amount is increased along the tracks No., -0, and -E in FIG. Therefore, the section o1 in FIG.
The increase in injection amount in -02 is suppressed to within the smoke tolerance, but in section 02-El, by further increasing the injection amount while maintaining the smoke tolerance state, the engine rotational speed instantly rises and the engine output increases dramatically. It will be increased.

After that, when the supercharging pressure increases rapidly and exceeds the predetermined supercharging pressure at the time of rapid acceleration, the adjustment pin 12 is further lowered and the control is switched to increase the fuel injection amount in accordance with the increase in the supercharging pressure. The injection quantity further increases according to curves EE2-E2 in FIG.

By the way, the control means 23 is also activated when the accelerator pedal 31 is slowly depressed to its maximum position during normal acceleration, but in this case, the supercharging pressure has already increased, and when accelerating suddenly. There is almost no difference in fuel injection amount,
Proper driving is maintained.

In this way, according to this embodiment, even in the case of low boost and high load, the output of the engine can be increased by significantly increasing the fuel injection amount compared to the conventional method without worsening smoke. . Furthermore, since the amount of fuel injection can be increased without installing an air pressure generator or the like, it has the advantage of being small, lightweight, and inexpensive, and can also be used in vehicle models that are not equipped with an air pressure generator.

In the above embodiment, the normal operation face cam 21 and the sudden acceleration face cam 22 were formed on the side surface of the adjustment pin 12, which had a substantially prismatic appearance. Both face cams may be formed on the surface. In this case, the engagement of the connecting pin 14 with each face cam is switched by rotating the adjustment pin 12 around its axis, and the connecting pin 14 There is no need to configure the structure to move.

Further, in this case, the shape of the flil adjustment pin may be such that when it is rotated, the fuel flow rate is simultaneously increased. In this case, the electromagnet 25 as the output adjustment means can be omitted. Further, in the above embodiment, an electromagnet is used for the selection means 211 and the first output adjustment stage 25, but an actuator, a pneumatic suction means, etc. may be used instead. Similarly, the actuating means may include a potentiometer, etc. A controller may be used that detects a sudden actuation of the accelerator pedal 31 and determines this as a sudden acceleration.

[Effect of the Invention 1] As is clear from the above explanation, according to the present invention, the response of the engine during sudden acceleration can be greatly improved, and the fuel consumption during operation can be improved.

It can prevent the deterioration of smoke.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a main part of an embodiment of the present invention in cross section, Fig. 2 is a system diagram of a supercharged engine showing an embodiment of the invention, and Fig. 3 is a fuel cell system diagram. -'1 A perspective view showing the flow rate adjustment pin, FIG. 4 is an enlarged cross-sectional view of essential parts of an embodiment of the present invention, FIG. 5 is a cross-sectional view taken along the line A-A in FIG. 11, and FIG. Fig. 7 is a timing chart of each part constituting the supercharged engine, and Fig. 8 shows the face cam for running the can and the face cam for sudden acceleration. 9 is a diagram showing changes in fuel flow rate during normal acceleration and rapid acceleration in an embodiment of the present invention, and FIG. 10 is a front view showing a partial cross section of a fuel injection pump having a conventional boost convencator. 11 is a diagram showing the fuel flow rate change during acceleration in the device of FIG. 10, FIG. 12 is a schematic configuration diagram of another conventional example, and FIG.
FIG. 3 is a diagram showing changes in fuel flow rate during acceleration in the device shown in FIG. 2; In the figure, 1 is the engine, 5 is the fuel injection pump, 6 is the boost convencator, 10 is the diaphragm, 12 is the fuel flow type adjustment pin, 13 is the boost convencator lever, 1
4 is a connecting pin, 21 is a face cam for normal operation, 22 is a face cam for sudden acceleration, 23 is a sudden acceleration control means, 211 is a selection means, 25 is an output adjustment means, and 26 is an operating means.

Claims (1)

[Claims] 1. The control member that is integrally attached to the diaphragm of the boost compensator has a first face cam that provides lift based on the supercharging characteristics during normal operation, and a first face cam that provides lift based on the supercharging characteristics during sudden engine acceleration. A second face cam is provided, a push rod is provided that selectively engages with these face cams to operate a boost compensator lever, and control means is provided for selecting the second face cam when the engine suddenly accelerates. A device to increase the output of a supercharged engine.