JPS59128038A - Booster for brake - Google Patents

Abstract

PURPOSE:To obtain fixed braking effectiveness alway at fixed pedaling force, by a method wherein pressure from a pressure source is controlled by a control signal based on a data processing device to which a brake control signal is applied and auxiliary force to an output piston acting upon a master cylinder is controlled. CONSTITUTION:When an input shaft 25 of a brake booster 20 is moved leftward by pedaling of a brake pedal, and a piston 24, an output shaft 26 and a primary piston 51 of a master cylinder 21 are moved unitarily leftward, brake liquid pressure is generated by the master cylinder 21, through which a brake is energized and braking is carried out. In this instance, a reduced speed read out according to an output of a control input sensing sensor 47 detecting the size of pedaling force in braking is compared with actual reduced speed sensed by a reduced speed sensing sensor in a data processing device (not illustrated hereupon). Then an increase of the brake liquid pressure is contrived as the piston 24 is moved leftward by controlling a solenoid valve 38 and making pressure in a pressure chamber 34 increase according to a result of the above comparison.

Description

DETAILED DESCRIPTION OF THE INVENTION 1) Industrial Field of Application This invention relates to a brake booster, and more particularly to a brake booster used as an actuator in a brake control device for an automobile having an electronic information processing device. It is.

10) Conventional technology and its problems Conventional automobile brake control devices have a structure in which the hydraulic pressure that acts on the brakes depends only on the magnitude of the force applied to the brake pedal by the driver. Although a large deceleration can be obtained in the above case, a larger pedal force is required to obtain the same deceleration as in the above case with a full load.

In addition, the effectiveness of the brake also changes depending on the slope of the road, the friction coefficient of the brake friction material, etc. Therefore, the driver needs a driving technique that changes the pedal force according to changes in the various driving conditions of the automobile.

Therefore, the applicant proposed a brake control device that does not require the above-mentioned driving techniques, that is, a brake control device that can always obtain a constant brake effect with a constant pedal force, regardless of changes in the various driving conditions in which the automobile is placed. The company has previously filed a v1 application for a brake control device (Japanese Patent Application No. 57-128737).

As shown in FIG. 1, the brake control device according to the patent application No. 1-6 includes an actuator 2 that operates a mask cylinder 1, a pump 3 for generating hydraulic pressure that acts on the actuator 2, and a brake control device that operates by the pump 3. Accumulator 4 of the generated hydraulic pressure, its m/E
In addition, based on the vehicle deceleration detection sensor 7 and the heating power from the same sensor 7, the effect can be adjusted to a preset value.
- It has an electronic one-key information processing device 8 such as a microprocessor that controls the control valve 6. In addition, the magnitude of the depression force on the brake pedal 9 is detected by the control input detection sensor 10 provided in the actuator 2 (1-), and this is detected by the control input detection sensor 10 (1-) It'
The f-information processing device 8 is operated manually. In FIG. 1, 11 is a liquid tank, 12 is a brake cylinder, and 13 is a wheel.

The above-mentioned brake control device inputs the desired relationship between the depression force of the brake pedal and the vehicle deceleration into the processing device 8 in advance.
Then, the actual vehicle deceleration is detected by the detection sensor 7, and this is compared with the brake control input data detected by the sensor 10, and the control valve 6 is controlled by the processing device 8 so that the desired deceleration is obtained. It is something to do.

Therefore, according to the brake control device described in ``-'', it is possible to always obtain a constant brake effectiveness with a constant pedal force regardless of changes in driving conditions.

On the other hand, conventionally known brake boosters use vacuum pressure,
Using hydraulic pressure as a driving source, the mask cylinder is actuated by an output that increases in proportion to the pedal force, and the driver senses the reaction force of the force acting on the mask cylinder via a reaction disk. Although this device is basically configured to be operated only by the driver's pedal effort, it cannot be controlled from the electronic information processing device as described above.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a brake booster having a structure suitable for use as an actuator in the above-mentioned electronic information processing apparatus.

C→ Means for Solving Problems The brake booster of the present invention includes a piston inserted into a cylinder, a pressure chamber for moving the piston between the piston and the cylinder, and a pressure source connected to the pressure chamber. A control valve is interposed in the passage, and one end of the piston shaft of the piston is connected to a brake pedal, and the other end is an output shaft that engages a mask cylinder, It has a 1-digit configuration with a human force detection sensor on the human force axis.

, 1] With the configuration described above, the brake control a+1 input signal is input to the electronic clear information processing device, and the pressure from the pressure source is controlled by the control signal 114 from the intermediary device to output an appropriate output. It is possible to apply manual force to the mask cylinder through the shaft, and the force of the sum of the pedal force acting on the input shaft and the assisting force acting on the piston can be applied to the mask cylinder.

2) Embodiment FIG. 2 shows a brake booster 20 according to an embodiment of the present invention.
This figure shows a state in which the mask cylinder 21 is combined with the mask cylinder 21.

(0) The F/L booster 20 includes a cylinder 23, a piston 24, a human power shaft 25 as a piston shaft, and an output shaft 2.
6.

The cylinder 23 is divided into a large diameter part 28 and a small diameter part 29 by a stepped part 27 formed in a part biased toward the input side. The piston 24 has a large diameter part 30 that slides inside the large diameter part 28 indicated in 1-, and a small diameter part 31 that slides inside the /J diameter part 29.
A hydraulic chamber 34 is formed by interposing these sliding contact portions 32 and 33.

Two passages 35 and 35' are formed in the cylinder 23 and communicate with a hydraulic pressure chamber 34, and each passage 35 and 35' communicate with valve chambers 36 and 36', respectively.

Plungers 39 and 39' of electromagnetic valves 38 and 38' fixed to the cylinder 23 of "1" are inserted into the valve chambers 36 and 36', and the tip needle portions 37 and 37' of the plungers 39 and 39' are inserted into the valve chambers 36 and 36'. The passages 3' and 35' are then closed. Further, each valve chamber as, ss' is communicated with an inlet boat 40 for connecting to the high pressure side of the pressure source and an outlet boat 41 for connecting to the low pressure side.

A coil spring 42 is inserted into the large diameter portion of the cylinder 23, one end of which engages with the screw 24, and the other end of which connects to the cylinder 23 with a bolt 43. 21, and constantly urges the piston 24 toward the input side.

] - The small diameter portion 31 of the piston 24 protrudes largely from the rear end of the cylinder 23 when the piston 24 is in the most retracted state, and a boot 44 is located between the tip and the cylinder 23.
The device is 1 L.

Further, a rearwardly open space 45 is formed in the small diameter portion 31 of the piston 24, and the human power shaft 25 passes through the space 45. Further, an output shaft 26 is provided protruding from the front surface of the large diameter portion 30 of the piston 24, and the output shaft 26 has the above-mentioned space 45.
Insert the tip ball part of the input shaft 25 into the recess formed from the side,
The input shaft 25 is connected to the piston 24 so as to be swingable by caulking a part of the recess to prevent the input shaft from falling out. The input shaft, 25, is located in the middle of
It has a control input detection section 46 in the shape of an eave, and a control human force detection sensor 47 using a strain gauge is attached to the detection section 46 and its lead wire is passed through the inside of the human power shaft 25.

I am trying to pull it out externally. The output shaft 26 also has a pipe-shaped output detection part 48 in the middle thereof, and an output detection sensor 4.9 using a strain gauge is attached to the detection part 48, and its lead wire is passed through the piston 24 to i'+ij It passes through the inside of the input shaft 25 mentioned above and is similarly drawn out to the outside.

In this way, when the lead wire is inserted into the input shaft 25, the input shaft 25 swings when the brake is applied, and the human power shaft 25
This reduces the clearance between the piston small diameter portion 31 and has the effect of preventing contact between the lead wire and the piston small diameter portion 31 that would occur when the lead wire is passed through the outside of the input shaft 25.

Note that the tip of the output shaft 26 in "1" is connected to the "7 star cylinder 2".
1 primary piston 51 .

Next, the operation of the brake booster described in -1- will be explained.

This brake booster 20 is used by being incorporated into a brake system, as shown by the parenthesized symbols in FIG. That is, each valve 38 and the control human power detection sensor 47 are electrically connected to the information processing device 8, the input port 40 is connected to the voltage side, and the output port 41 is connected to the low voltage side.

Now, when the driver steps on the brake pedal 9, the input shaft 25
pushes the piston 24, and the output shaft 2 integrated with the piston 24
6 operates the primary piston 51 of the star cylinder 21 to generate brake fluid pressure. The brake cylinder 12 is actuated by the hydraulic pressure to reduce the rotational speed of the twin wheels 13. The deceleration of the vehicle due to a decrease in the rotational speed of the wheels 13 is determined by the information processing device 8 based on the signal from the deceleration detection sensor 7 .

-The information processing device 8 includes a control input detection sensor 47.
Since the magnitude of the brake pedal force is inputted by , the device 8 inputs data related to the deceleration corresponding to the pedal force applied manually and stored in advance, and the deceleration actually detected by the deceleration detection sensor 7. Compare.

As a result, if the deceleration is small relative to the pedal effort, a control signal is output to the solenoid valve 38 to activate it. Solenoid valve 3
8, the plunger 39 is moved back, thereby opening the passage 35, so that the pressure in the liquid chamber 34 rises and advances the screw I/N 24 by +)iJ. Since the brake fluid pressure increases as the piston 24 moves forward, the electromagnetic valve 38 is returned to its original position when a state in which deceleration commensurate with the pedal effort is detected.

Furthermore, if the driver reduces the pedal force while braking, the balance between the pedal force and deceleration will be lost, so the information processing device 8 sends a control signal to the solenoid valve 38' on the output port 41 side, and this solenoid valve 38' , the passage 35' is opened and the pressure in the hydraulic chamber 34 is reduced.

In this case, the liquid flowing out from the output port 41 returns to the liquid tank 11.

Note that if the signal of the output detection sensor 49 is input to the information processing device 8, if the output of the sensor 49 and the output of the control human power detection sensor 47 described in 13iJ are the same size or a similar value, , hydraulic equipment (pump 3, accumulator 4, hydraulic passage, etc.), solenoid valve 38, 38', etc., so by comparing the magnitude of both signals, the information processing device At step 8, failure of the device can be detected and a warning can be issued to the driver.

However, even in such a failure state, in the device of the present invention, the human power shaft 25, the piston 24, and the output shaft 26 are integrated, and the output shaft 26 engages with the primary piston 51 of the mask cylinder 21. Therefore, it is possible to ensure a braking function based only on pedal force.

In addition, the same effect can be obtained by using a spool valve instead of the needle valve type solenoid valve 38, 38' as the gauze type of the embodiment described above.

In addition, the input/output detection section also adheres to the structure illustrated,
It is self-evident that any kind of sensor that converts force into an electrical signal can be used.

In addition, in the control by the information processing device 8, if the time delay from when the driver depresses the brake pedal 9 to when the required deceleration is obtained is too large, it is determined that the The current output of this device is determined by referring to the output information obtained by the output detection sensor and sensor during multiple previous brake operations, including the previous brake operation, and the deceleration 1 information obtained from the deceleration detection sensor. 01j To estimate the vehicle deceleration and control the output of this device from the information processing device through the control valve so that the estimated deceleration becomes a preferable deceleration corresponding to the current pedal depression force. It is possible to shorten the time delay.

Since the brake booster of the present invention has the configuration described below, it is electronic type 1? By using the i-information processing device as an actuator of a brake control device, it is possible to always obtain a constant brake effectiveness with a constant pedal force regardless of changes in driving conditions.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a brake control a+1 device, and FIG. 2 is a sectional view of an embodiment of the invention. 20... Brake booster, 21... Mask cylinder, 23... Cylinder, 24... Piston, 25...
...Human power shaft, 26...Output shaft, 34...Hydraulic pressure chamber, 3
5.35゛...°・Passage, 37...Needle part, 3
8.38'... Solenoid valve, 45... Space, 47...
Control input detection sensor, 49... Output detection sensor 'ljI'jj'l output: 1 person 1 friend't L Shiki Kogyo Co., Ltd. 1 agent - and 111 text 2 Figure 2

Claims (1)

[Claims] 11+ A piston is inserted into a cylinder, and a pressure chamber for moving the piston is provided between the piston and the cylinder, a passage connected to a pressure source is communicated with the pressure chamber, and a pressure chamber is provided in the passageway for controlling the piston. A brake booster comprising an input shaft that connects one end of the piston shaft of the piston to a brake pedal, an output shaft that engages the other end of the piston shaft with a mask cylinder, and an input detection sensor attached to the input shaft, with a valve interposed therebetween. . (2) A liquid pressure source is used as the above pressure source, and a passage connecting the high pressure side of the hydraulic storage and the pressure chamber and a passage connecting the low pressure side and the pressure chamber are provided, and a control valve is interposed in each passage. A brake booster according to claim 1. (3) The brake booster according to claim 1, wherein the piston has a space open to the input side, and the input shaft passes through the space.