KR20030053940A - break performance improvement system using brake booster - Google Patents

Abstract

PURPOSE: A device for improving a braking performance by using a brake booster is provided to rapidly and exactly return an operating rod, return and pressure springs comprising the brake booster, and completely return a brake pedal, accordingly to improve a manipulating feeling when drivers operate the brake pedal for the next braking, and to increase the braking reaction rate and improve braking performance. CONSTITUTION: A device for improving a braking performance by using a brake booster(10) is composed of a brake pedal sensor(30) detecting the working and functioning displacement of a brake pedal(31), a vacuum pump(40) generating vacuum pressure by using the driving force of an engine, a vacuum control valve(50) connected through the vacuum pump, a static pressure chamber(A) and a transformation chamber(B) of the brake booster, and each vacuum hose(41,42,43), and an ECU(Electronic Control Unit,60) controlling the action of the vacuum control valve to selectively supply vacuum pressure, which is generated by the vacuum pump, to the transformation chamber by applying power to the vacuum control valve according to the signal transmitted from the brake pedal sensor. In additional, the vacuum control valve works to selectively supply vacuum pressure, which is generated by the vacuum pump to the negative pressure of the static pressure chamber, to the static pressure chamber.

Description

Break performance improvement system using brake booster

The present invention relates to a braking performance improving device using a brake booster, and in particular, when the brake system returns as a whole after the braking force is generated, the vacuum pressure is filled into the transformer chamber of the brake booster to improve the feeling of operation during the next brake pedal operation and the braking reaction speed and The present invention relates to a braking performance improving device using a brake booster that can also improve braking performance.

In general, a brake system is a device that generates a braking force on a driving vehicle so that the vehicle does not move by itself, and is normally operated by hydraulic pressure generated / supplied from the master cylinder according to the operation of the brake pedal.

That is, the vehicle has a brake pedal that the driver steps on to generate a braking force, a brake booster configured to amplify the stepping force of the brake pedal by using a difference between the vacuum pressure and the atmospheric pressure generated from the engine, and the brake pedal of the brake pedal. The master cylinder which converts a stepping force into hydraulic pressure, and the brake body etc. which receive hydraulic pressure from this master cylinder and generate | occur | produce a real braking force are attached.

Therefore, when the driver steps on the brake pedal, the operating rod 11 of the brake booster 10 shown in FIG. 1 is advanced by the pedal effort of the pedal, and the valve body 12 is moved as the operating rod 11 is advanced. ) Closes the vacuum passage (C) between the positive pressure chamber (A) and the transformer chamber (B) separated by the diaphragm (14) while touching the poppet valve (13), and at the same time the poppet valve (13) and the plunger As the air passage D between the valves 15 is opened, air is introduced into the transformer chamber B.

Then, as the valve body 12 continues to move forward, the reaction disk 16 is deformed to eliminate the gap between the valve body 12 and the plunger valve 15, and the valve body 12 and the plunger valve ( As the gap between 15) disappears, thrust due to the stepping force and pneumatic pressure pushes the piston 21 of the master cylinder 20 through the push rod 17 to generate a hydraulic pressure (hydraulic pressure).

In addition, the hydraulic pressure generated by the master cylinder 20 is supplied to the brake body through a brake pipe, an oil distributor, a brake hose, and the like, and the hydraulic pressure supplied to the brake body is a brake shoe or a brake pad to a drum or a disk. By pressing, the braking force generated by the frictional force is generated to stop the vehicle being driven.

On the other hand, when the driver releases the brake pedal after the braking force is generated, the pressure spring 18 is restored by the elastic force, and the operating rod 11 is returned to the original position, and the operating rod 11 is returned to the original position. At the same time, the poppet valve 13 is separated from the valve body 12, and at this time, the air of the transformer chamber B is discharged through the vacuum passage C, and the positive pressure chamber A and the transformer chamber B are discharged. The pressure inside is equal, and finally, the restoring force of the return spring 19 causes the valve body 12 to return to its original position.

However, according to the conventional brake booster 10 as described above, when the brake system returns as a whole after the braking force is generated, the vacuum degree of the positive pressure chamber A and the transformer chamber B in the brake booster 10 is changed to the constant pressure chamber A. ) 'S negative pressure> negative pressure in the positive pressure chamber (A) + atmospheric pressure in the transformer chamber (B)〉 atmospheric pressure in the transformer chamber (B)'. When the sum is lower than the negative pressure of the positive pressure chamber A, the return spring 19 and the pressure spring 18 constituting the brake booster 10 and the return of the operating rod 11 are not properly made. There is a problem that, because of this, the brake pedal does not come back completely.

In addition, if the brake pedal is not completely returned, the operation of the brake pedal becomes worse when the driver operates the brake pedal for the next braking, and thus, the braking response speed and the braking performance are reduced, thereby causing a safety accident. There was a problem that could be.

Accordingly, the present invention has been made to solve the above problems, when the brake system is returned to the overall after the braking force is generated by forcibly filling the vacuum pressure into the transformer chamber of the brake booster to increase the vacuum of the transformer chamber greater than the negative pressure of the positive pressure chamber By forming the brake booster, the return springs and pressure springs constituting the brake booster and the return of the operating rod can be made quickly and accurately, so that the brake pedal can be completely returned, and the driver brakes for the next braking. It is an object of the present invention to provide a braking performance improving device using a brake booster which is capable of improving a feeling of operation of a brake pedal and increasing a braking reaction speed and a braking performance when operating a pedal.

The braking performance improving device of the present invention for achieving the above object, the brake pedal sensor for detecting the presence or absence of the operation of the brake pedal, the vacuum pump for generating a vacuum pressure using the driving force of the engine, and the vacuum pump And a vacuum control valve connected to each of the positive pressure chamber and the transformer chamber of the brake booster, the vacuum control valve being operated to selectively supply the vacuum pressure generated by the vacuum pump according to the negative pressure of the positive pressure chamber to the constant pressure chamber, and the brake It is characterized by consisting of an electronic control unit for controlling the operation of the vacuum control valve so that the vacuum pressure generated by the vacuum pump is selectively supplied to the transformer chamber by applying power to the vacuum control valve in accordance with the signal transmitted from the pedal sensor. .

1 is a longitudinal sectional view illustrating a brake booster which is generally used;

2 is a schematic configuration diagram for explaining a braking performance improving apparatus according to the present invention;

3 to 5 are longitudinal cross-sectional views for explaining the vacuum control valve according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10-Brake Booster 30-Brake Pedal Sensor

31-Brake Pedal 40-Vacuum Pump

41,42,43-Vacuum Hose 50-Vacuum Control Valve

51a-Vacuum pump connection passage 51b-Constant pressure chamber connection passage

51c-Transformer chamber connection passage 52-Compression spring

53-Positive pressure chamber valve 54-Tension spring

55-Transformer solenoid valve 60-Electronic control unit (ECU)

A-pressure chamber B-transformer chamber

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

Figure 2 is a schematic configuration diagram for explaining a braking performance improving apparatus according to the present invention, will be described with the same reference numerals to the same parts as the conventional structure.

The braking performance improving apparatus according to the present invention, as shown in Figure 2, the brake pedal sensor 30 for detecting the presence or absence of the operation of the brake pedal 31 and the vacuum to generate a vacuum pressure using the driving force of the engine Pump 40, the vacuum pump 40 and the pressure booster chamber (A) and the transformer chamber (B) of the brake booster 10 and the respective vacuum hoses (41, 42, 43) while being connected to the positive pressure chamber ( A signal transmitted from the brake control sensor 30 and the vacuum control valve 50 which is operated to selectively supply the vacuum pressure generated by the vacuum pump 40 to the positive pressure chamber A according to the negative pressure of A). In accordance with the electronic control unit for controlling the operation of the vacuum control valve 50 to supply power to the vacuum control valve 50 to selectively supply the vacuum pressure generated by the vacuum pump 40 to the transformer chamber ( 60; ECU).

Here, the vacuum control valve 50 is connected to each of the vacuum hoses (41, 42, 43) connected to the vacuum pump 40, the positive pressure chamber (A) and the transformer chamber (B) as shown in FIG. A valve housing 51 having a vacuum pump connecting passage 51a, a constant pressure chamber connecting passage 51b and a transformer chamber connecting passage 51c of the constant pressure chamber A, and a compression on the constant pressure chamber connecting passage 51b. Constant pressure chamber valve 53 and the transformer chamber connecting passage 51c which is installed via a spring 52 and selectively opened and closed by the vacuum pressure generated in the vacuum pump 40 according to the negative pressure of the constant pressure chamber A. It is composed of a transformer chamber solenoid valve 55 that is opened and closed in accordance with the supply of the power supplied by the control of the electronic control unit 60 while being installed on the tension spring 54 on the.

Meanwhile, as shown in FIGS. 3 and 4, the positive pressure chamber valve 53 has a vacuum pressure in which the negative pressure of the positive pressure chamber A is generated in the vacuum pump 40 when the brake pedal 31 is operated or not operated. It is operated so as to open when it is smaller, and when the negative pressure of the positive pressure chamber (A) is equal to or greater than the vacuum pressure generated in the vacuum pump 40, it is configured to operate to be closed.

Then, the transformer chamber solenoid valve 55 is opened as power is supplied by the control of the electronic control unit 60 when the brake pedal 31, which was operated when the braking force is generated, is returned to its original position as shown in FIG. It becomes the structure that becomes.

Hereinafter, a general operation process of the brake system will be described with reference to FIGS. 1 and 2.

First, when the driver steps on the brake pedal 31, the operating rod 11 of the brake booster 10 shown in FIG. 1 is advanced by the pedal effort of the pedal, and as the operating rod 11 moves forward, the valve While the poppet valve 13 comes into contact with the body 12, the vacuum passage C between the positive pressure chamber A and the transformer chamber B separated by the diaphragm 14 is blocked, and at the same time, the poppet valve 13 ) And the atmosphere passage D between the plunger valve 15 is opened to allow the atmosphere to flow into the transformer chamber B.

Then, as the valve body 12 continues to move forward, the reaction disk 16 is deformed to eliminate the gap between the valve body 12 and the plunger valve 15, and the valve body 12 and the plunger valve As the interval between the (15) disappears, the thrust by the stepping force and pneumatic pressure to push the piston 21 of the master cylinder 20 through the push rod 17 to generate a hydraulic pressure (hydraulic).

In addition, the hydraulic pressure generated by the master cylinder 20 is supplied to the brake body through a brake pipe, an oil distributor, a brake hose, and the like, and the hydraulic pressure supplied to the brake body is a brake shoe or a brake pad to a drum or a disk. By pressing, the braking force generated by the frictional force is generated to stop the vehicle being driven.

When the driver releases the brake pedal 31 after the braking force is generated, the pressure spring 18 is restored by the elastic force, and the operating rod 11 returns to its original position, and the operating rod 11 returns to its original position. At the same time, the poppet valve 13 is separated from the valve body 12 and the air of the transformer chamber B is discharged through the vacuum passage C. The pressure in (B) becomes the same, and finally, the restoring force of the return spring 19 causes the valve body 12 to return to its original position.

On the other hand, when the brake pedal 31 is deactivated or operated to generate a braking force, the negative pressure in the positive pressure chamber A of the brake booster 10 is greater than or equal to the vacuum pressure generated by the vacuum pump 40. As shown in FIG. 3, the positive pressure chamber valve 53 and the transformer chamber solenoid valve 55 of the vacuum control valve 50 are sealed while being supported by the elastic force of the compression spring 52 and the tension spring 54, respectively. Will be maintained.

In addition, when the brake pedal 31 is deactivated or operated to generate a braking force, the negative pressure chamber A of the brake booster 10 is smaller than the vacuum pressure generated by the vacuum pump 40. As shown, the constant pressure chamber valve 53 is changed to an open state by the vacuum pressure of the vacuum pump 40, and the transformer chamber solenoid valve 55 is closed while being supported by the elastic force of the tension spring 54. Will be maintained.

Thus, when the negative pressure of the positive pressure chamber (A) is less than the vacuum pressure generated in the vacuum pump 40, when the vacuum pressure flows into the positive pressure chamber (A) while the positive pressure chamber valve (53) is opened, to generate a braking force. When the brake pedal 31 is actuated, it is possible to greatly increase the stepping force, and thus, the hydraulic force generated by the master cylinder 20 is also increased so that the braking performance can be further improved.

In addition, when the brake pedal 31, which has been operated to generate the braking force, returns to its original position due to the return of the brake system, the constant pressure chamber valve 53 is kept closed as shown in FIG. The transformer chamber solenoid valve 55 is kept open as power is supplied by the control of the electronic control unit 60.

In this way, when the brake pedal 31 is returned and the transformer chamber solenoid valve 55 is opened and the vacuum pressure flows into the transformer chamber B, the vacuum degree of the transformer chamber B is It becomes larger than the negative pressure, which causes the return of the return spring 19 and the pressure spring 18 constituting the brake booster 10 and the return of the operating rod 11 is made quickly and accurately while the brake pedal 31 A complete return is also made.

In addition, if the brake pedal 31 is completely returned, the operation feeling of the brake pedal 31 is improved when the driver operates the brake pedal 31 for the next braking, and the braking reaction speed is increased. The faster the braking performance is increased.

As described above, according to the present invention, when the brake system returns as a whole after the braking force is generated, the vacuum pressure is supplied to the transformer chamber of the brake booster, thereby quickly returning the return spring and the pressure spring constituting the brake booster and returning the operating rod. The brake pedal is also fully restored and the brake pedal is fully returned. This improves the feeling of operation of the brake pedal when the driver operates the brake pedal for the next braking, and also increases the braking performance with a faster braking response speed. do.

Claims (4)

A brake pedal sensor 30 for detecting the presence or absence of the operation of the brake pedal 31 and a displacement, a vacuum pump 40 for generating a vacuum pressure using the driving force of the engine, the vacuum pump 40 and the brake booster 10 Vacuum pressure generated by the vacuum pump 40 according to the negative pressure of the positive pressure chamber (A) while being connected to the positive pressure chamber (A) and the transformer chamber (B) of the vacuum chamber (41, 42, 43) And a power supply to the vacuum control valve 50 according to the signal transmitted from the brake pedal sensor 30 and the vacuum control valve 50 which is selectively supplied to the positive pressure chamber A to supply the vacuum pump 40. Braking performance improving apparatus using a brake booster consisting of an electronic control unit (60; ECU) for controlling the operation of the vacuum control valve 50 so that the vacuum pressure generated by the) is selectively supplied to the transformer chamber (B). The vacuum pump of claim 1, wherein the vacuum control valve 50 is connected to a vacuum pump 40 and a respective vacuum hose 41, 42, 43 connected to the positive pressure chamber A and the transformer chamber B. A valve housing 51 in which a connecting passage 51a, a constant pressure chamber connecting passage 51b of the constant pressure chamber A, and a transformer chamber connecting passage 51c is formed, and a compression spring on the constant pressure chamber connecting passage 51b. 52 is installed via the constant pressure chamber valve 53, which is selectively opened and closed by the vacuum pressure generated in the vacuum pump 40 in accordance with the negative pressure of the constant pressure chamber (A), and on the transformer chamber connection passage (51c) Braking performance using a brake booster, characterized in that consisting of a transformer chamber solenoid valve (55), which is installed via a tension spring (54) and opened and closed in accordance with the presence or absence of power supplied by the control of the electronic control unit (60). Enhancement device. 3. The positive pressure chamber valve 53 is operated such that the brake pedal 31 is operated when the brake pedal 31 is operated or when the negative pressure of the constant pressure chamber A is lower than the vacuum pressure generated in the vacuum pump 40. And, when the negative pressure of the positive pressure chamber (A) is equal to or greater than the vacuum pressure generated by the vacuum pump (40), the braking performance improving device using a brake booster, characterized in that the operation is closed. 3. The transformer chamber solenoid valve (55) according to claim 2, wherein the transformer chamber solenoid valve (55) is opened as power is supplied by the control of the electronic control unit (60) when the brake pedal (31), which was operated when the braking force is generated, is returned to its original position. Braking performance improving device using brake booster.