KR100240500B1 - Exhaust brake having a function of two-step variety in automobile - Google Patents

Abstract

The present invention discloses a two-stage variable exhaust brake device for an automobile. The disclosed invention includes a pneumatic cylinder (6) whose drive is controlled by an electronic control unit (70); A link 4, one end of which is pivotally connected to the rod 5 of the pneumatic cylinder 6, the other end of which is rotatably supported; A rotation shaft 3 having one end connected to the other end of the link 4 at right angles so that the other end enters the exhaust pipe, and the oil passage 31 is formed from one end to the middle part along the axial direction; An oil source 40 connected to the oil passage 31 of the rotary shaft 3; An on / off valve 50 for controlling the flow of oil provided from the oil source 40 to the oil passage 31 by the electronic control unit 70; An exhaust cut-off large diameter valve 10 fixed to the rotating shaft 3, having a diameter enough to completely block the exhaust pipe, having an opening formed in a circular shape at the center thereof, and having a locking groove 11 formed at an inner wall of the opening; Exhaust shut-off small diameter valve having a communication hole 21 connected to the locking groove 11 and the oil passage 31 so as to freely engage the rotary shaft 3 while sealing the opening of the exhaust shut-off large diameter valve 10 ( 20); A locking pin 60 movably fitted into the communication hole 21 to enter the locking groove 11 by oil pressure to restrict the large and small exhaust valves 10 and 20; And it is wound around the outer circumference of the locking pin 60, one end is fixed, the other end is fixed to the rotating shaft 3, characterized in that it comprises a return spring 61 for imparting a restoring force to the locking pin (60).

Description

Two stage variable exhaust brake system of car

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage variable exhaust brake device for an automobile, and more particularly, to an exhaust brake device in which an operation of an exhaust brake for braking by blocking the flow of exhaust gas is changed in two stages according to the vehicle speed. .

In general, the exhaust brake is used to assist the foot brakes and engine brakes, which are mainly used in large-sized diesel engines using four-cycle diesel engines. It is a kind of engine brake that generates braking force.

Therefore, since the exhaust brake uses exhaust resistance obtained by blocking the flow of exhaust gas, exhaust resistance is obtained by selectively operating the butterfly-shaped exhaust shutoff valve provided in the exhaust pipe, which is a passage through which the exhaust gas is discharged, to be completely closed. It is supposed to be.

In addition, since the injection of fuel into the combustion chamber must be stopped while the exhaust shutoff valve is closed, an intake shutoff valve is provided in the intake pipe to shut off the supply of fuel.

FIG. 1 shows a conventional exhaust brake device, in particular an exhaust shut-off valve, which acts as above.

As shown in the figure, a butterfly-shaped exhaust shut-off valve 2 is provided in the exhaust pipe 1 that is large enough to completely block the flow of the exhaust gas, and the exhaust shut-off valve 2 has a rotary shaft 3. It is installed along the center. One end of the link 4 is fixed to the end of the rotating shaft 3, and the rod 5, which is advanced back and forth by the pneumatic cylinder 6, is pivotally connected to the other end of the link 4 at a predetermined acute angle. On the other hand, the operation of the pneumatic cylinder (6) is to be operated directly by the driver, and therefore, a button for operating the pneumatic cylinder (6) is provided in the driver's seat.

It is comprised as mentioned above, when the steel plate travels a steep slope, it operates a foot brake and an engine brake, and when a driver determines that braking force is weak with a foot brake and an engine brake, it presses a button and operates the pneumatic cylinder 6. The rod 5 is advanced by the air pressure provided from the pneumatic cylinder 6, causing the lever 4 to rotate. Therefore, as the rotary shaft 3 rotates, the exhaust cutoff valve 2 completely blocks the exhaust pipe 1. In this case, since the flow of the exhaust gas is interrupted, the engine output is reduced, resulting in the effect of operating the engine brake.

However, the conventional exhaust brake device is difficult to control the engine output since the exhaust shutoff valve 2 completely blocks the exhaust pipe 1 regardless of the degree of stepping on the brake pedal and the vehicle speed. That is, the engine brakes could not be effectively operated, and in many cases too much braking was applied.

In addition, the conventional exhaust brake apparatus also has a problem that the driver does not brake according to the vehicle speed and the pedaling force of the brake pedal because the driver arbitrarily determines the vehicle speed and operates it manually.

Accordingly, the present invention has been made to solve the problems caused by the conventional exhaust brake device, by varying the degree to block the exhaust pipe in accordance with the pedal pedal effort and the vehicle speed, so that the control of the engine output can be easily Accordingly, an object of the present invention is to provide a two-stage variable exhaust brake device for an automobile capable of preventing excessive braking.

In addition, the present invention is to operate automatically according to the vehicle speed and the pedaling force of the brake pedal rather than manual operation, to provide a two-stage variable exhaust brake device of the vehicle capable of braking corresponding to the vehicle speed and the pedaling force of the brake pedal. Has a different purpose.

1 is a view showing a conventional exhaust brake apparatus.

2 is a view showing a two-stage variable exhaust brake system according to the present invention.

FIG. 3 is an enlarged cross-sectional view of part III of FIG. 2.

4 is a view showing an installation state of a brake position sensor.

5 is a block diagram showing the operational flow of the present invention.

6 and 7 are explanatory diagrams of the operation of the present invention, and FIG. 6 is a one-stage operation state diagram.

7 is a two-stage operating state diagram.

* Explanation of symbols for main parts of the drawings

1: exhaust pipe 3: rotating shaft

4: link 5: loading

6: pneumatic cylinder 10: large exhaust valve

11: Locking groove 20: Exhaust shut-off small diameter valve

21: communication hole 31: oil passage

40: oil source 50: on-off valve

60: locking pin 61: return spring

70: electronic control unit 80: vehicle speed sensor

90: brake position sensor

In order to achieve the above object, the present invention, the pneumatic cylinder is driven by the electronic control unit according to the pedal force and the vehicle speed of the brake pedal; A link pivotally connected to one end of the rod of the pneumatic cylinder and the other end pivotally supported to a predetermined structure adjacent the side of the exhaust pipe; A rotary shaft having one end connected to the other end of the link at right angles so that the other end enters into the exhaust pipe and an oil passage is formed from the one end to an intermediate part along the axial direction; An oil source connected to the oil passage of the rotating shaft; Opening and closing valve for controlling the flow of oil provided from the oil source to the oil passage by the electronic control unit; It is fixed to the rotating shaft, has a diameter enough to completely block the exhaust pipe, the opening is formed in the center in a circular shape An exhaust cut-off large diameter valve having a locking groove formed on an inner wall of the opening; An exhaust-blocking small-diameter valve, which seals the opening of the exhaust-blocking large-diameter valve so as to be freely rotated in the rotating shaft and has a communication hole connected to the locking groove and the oil passage; A locking pin movably inserted into the communication hole, the locking pin entering the locking groove by oil pressure to restrict the exhaust shutoff large diameter and the small diameter valve; And a return spring wound around the outer circumference of the locking pin, the other end being fixed to the rotating shaft, and providing a restoring force to the locking pin.

According to the configuration of the present invention described above, by the pneumatic cylinder and the oil source electronically controlled in accordance with the pedal force and the vehicle speed of the brake pedal to selectively operate the exhaust shut-off large diameter and small diameter valve to block the exhaust pipe over two stages, Engine output control is made effective, so that the exhaust brake is operated more efficiently.

EXAMPLE

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

2 is a view showing a two-stage variable exhaust brake system according to the present invention, FIG. 3 is an enlarged cross-sectional view showing part III of FIG. 2, and FIG. 4 is a view showing an installation state of the brake position sensor. Fig. 6 is a block diagram showing the operational flow of the present invention. Figs. 6 and 7 are explanatory views of the operation of the present invention. Fig. 6 shows one step operation and Fig. 7 shows two step operation.

For reference, in the description of the configuration of the present embodiment, the same parts as in the prior art described at the beginning of the specification are omitted and repeated descriptions are mainly described in order to avoid duplication of description. use.

As shown in FIG. 2, one end of the link 4 is pivotally connected to the rod 5 forward and backward by the pneumatic cylinder 6 at a predetermined acute angle, and the other end of the link 4 is not shown. It is rotatably supported by a predetermined structure on the side of the exhaust pipe. One end of the rotary shaft 3 is fixed to the other end of the link 4, and the other end enters the exhaust pipe.

The above is the same as the conventional one, and in the present invention, the components to be described below are added to each of the above components, so that the exhaust brake is operated in two stages.

First, as shown in FIG. 3, an oil passage 31 is formed from one end to the middle of the rotation shaft 3. An oil source 40 for providing oil to the oil passage 31, for example a driving element such as an oil pump, is connected to the oil passage 31, between which an on-off valve 50 for controlling the oil flow is provided. Is installed.

Here, as will be described later with reference to FIG. 5, the pneumatic cylinder 6 and the on-off valve 50 are electronically controlled automatically by the electronic control unit 70, rather than manually operated.

Referring again to FIG. 2, the exhaust shutoff valves for blocking the flow of the exhaust gas flowing in the exhaust pipe are divided into two, large diameter and small diameter. That is, the exhaust shut-off large diameter valve 10 has a diameter enough to completely block the exhaust pipe 1, as shown in FIGS. 6 and 7, and has a donut shape having a circular opening in the center thereof. Is done. The exhaust shut-off small diameter valve 20 is located in the opening of the exhaust shut-off large diameter valve 10 to completely close the opening. In particular, the exhaust shut-off large diameter valve 10 is fixed to the rotary shaft 3 and rotated together, while the exhaust shut-off small diameter valve 20 is fitted to the rotary shaft 3 so as to be freely rotatable and rotates together with the rotary shaft 3. It doesn't work.

Therefore, in order to rotate the exhaust shut-off small diameter valve 20, it is necessary to connect the exhaust shut-off small diameter valve 2 to the exhaust cut-off large diameter valve 10, and a means for this is shown in detail in FIG.

As shown, the end of the oil passage 31 extends in both directions perpendicular to the axial direction of the rotation shaft 3 to be connected to the exhaust shut-off small diameter valve 20. A pair of communication holes 21 are formed in this portion of the exhaust shut-off small diameter valve 20 at equal intervals of 180 °, and the communication holes 21 continue to extend in the radial direction to be connected to the exhaust cut-off large diameter valve 10. do. A pair of locking grooves 11 are formed in each portion of the exhaust cut-off large diameter valve 10 connected to the communication hole 21.

A pair of locking pins 60 pushed into the locking groove 11 by hydraulic pressure are inserted into the communication holes 21 so that the lower ends of the locking pins 60 pass through the communication holes 21. It is in the state entered at the end of the oil passage (31). Therefore, when each locking pin 60 comes down completely through the end of the oil passage 31 and comes into contact with each other, oil is not supplied to the lower end thereof, so that the oil passage 31 leading to the communication hole 21 is prevented. In the extended portion, a pair of flanges 32 are formed to prevent the lowering of each locking pin 60. In addition, when the oil supply is stopped, the return spring 61 for returning the locking pin 60 to its original position is wound around the outer circumference of the locking pin 60 so that one end thereof is fixed and the other end is fixed to the rotation shaft 3.

On the other hand, as briefly mentioned above as shown in FIG. 5, the pneumatic cylinder 6 and the opening / closing valve 50 are controlled by the electronic control unit 70. As shown in FIG. That is, as shown in FIG. 4, the brake position sensor 90 attached to the brake pedal 62 to detect the displacement of the pedal which is the pedaling force of the brake pedal, and the vehicle speed sensor 80 for detecting the speed of the vehicle. The information sensed by the electronic control unit 70 is input to the electronic control unit 70, and the electronic control unit 70 operates the pneumatic cylinder 6 and the on-off valve 50 according to the input information.

Hereinafter, the operation of the present embodiment configured as described above will be described in detail with reference to FIGS. 6 and 7.

While traveling on the steep slope, the electronic control unit 70 selectively operates the pneumatic cylinder 6 and the on / off valve 50 according to the information provided from the brake position sensor 90 and the vehicle speed sensor 80. Let it work

For example, when the electronic control unit 70 determines the first stage based on the input power and the speed of the brake, the exhaust cut-off large diameter valve 10 is operated as shown in FIG. 1) is blocked, while the exhaust shut-off small diameter valve 20 is not operated to open the exhaust pipe 1.

That is, the electronic control unit 70 keeps the on-off valve 50 closed, and drives only the pneumatic cylinder 6. As the rod 5 is advanced, the link 4 is rotated, and the exhaust shut-off large diameter valve 10 is rotated by the rotation of the rotary shaft 3 to block the exhaust pipe 1 as shown in FIG. However, since the exhaust shut-off small diameter valve 20 can be freely rotated about the rotation shaft 3 without being fixed to the exhaust shut-off large diameter valve 10, the exhaust gas is exhausted while the exhaust shut-off small diameter valve 20 is turned over. It passes through the pipe (1). Of course, since the flow rate of the exhaust gas becomes smaller than when the exhaust pipe 1 is fully opened, the engine speed decreases by a corresponding amount, thereby reducing the vehicle speed.

However, if the electronic control unit 70 determines that it is in two stages, it not only activates the pneumatic cylinder 6 but also opens and closes the valve 50. In this case, oil is supplied to the oil passage 31 to push the lower ends of the respective locking pins 60. As the locking pin 60 extends the return spring 61, the upper end thereof is inserted into the locking groove 11 through the communication hole 21, thereby fixing the exhaust shut-off small diameter valve 20 to the exhaust cut-off large diameter valve 10. Let's go.

Therefore, the rotational force of the rotary shaft 3 rotated by the pneumatic cylinder 6 simultaneously rotates the exhaust cut-off large diameter and the small-diameter valves 10 and 20, thereby completely shutting off the exhaust pipe 1 as shown in FIG. In this way, the exhaust gas cannot flow through the exhaust pipe 1 at all, so that the engine output is reduced more than the first stage, and correspondingly, the vehicle speed is further reduced.

As described above, according to the present invention, since the exhaust brake is operated in two stages according to the vehicle speed and the pedaling degree of the brake pedal, the output of the engine can be easily controlled, and the exhaust brake can be operated more efficiently.

In addition, since the exhaust brake is automatically controlled electronically by the electronic control unit, not by manual, the exhaust brake can be operated to meet the current driving conditions.

On the other hand, the present invention is not limited to the above-described specific preferred embodiments, and various changes can be made by those skilled in the art without departing from the gist of the invention claimed in the claims. will be.

Claims (2)

A pneumatic cylinder whose drive is controlled by the electronic control unit in accordance with the pedal force and the vehicle speed of the brake pedal; A link pivotally connected to one end of the rod of the pneumatic cylinder and the other end pivotally supported to a predetermined structure adjacent the side of the exhaust pipe; A rotary shaft having one end connected to the other end of the link at right angles so that the other end enters into the exhaust pipe and an oil passage is formed from the one end to an intermediate part along the axial direction; An oil source connected to the oil passage of the rotating shaft; An on / off valve controlling the flow of oil provided from the oil source to the oil passage by the electronic control unit; An exhaust cut-off large diameter valve fixed to the rotating shaft, having a diameter enough to completely block the exhaust pipe, having an opening formed in a circular shape at the center thereof, and having a locking groove formed at an inner wall of the opening; An exhaust shut-off small-diameter valve sealing the opening of the exhaust-blocking large-diameter valve so as to be freely rotated on the rotating shaft and having a communication hole connected to the locking groove and the oil passage; A locking pin movably inserted into the communication hole, the locking pin entering the locking groove by oil pressure to restrict the exhaust shutoff large diameter and the small diameter valve; And a return spring wound around an outer circumference of the locking pin and fixed at the other end to a rotating shaft to provide a restoring force to the locking pin. 2. 2. The two-stage vehicle according to claim 1, wherein the communication hole and the locking groove are constituted by a pair disposed at equal intervals of 180 [deg.] With respect to the axial direction of the rotating shaft, and the locking pin and the return spring are also configured as a pair. Variable exhaust brake system.

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