JPH0478507B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a vehicle brake device that can change braking force depending on the strength of the operating force of a manual switch. [Prior Art] When driving a car, it is extremely troublesome to press the accelerator pedal and the brake pedal. Therefore, in recent years, a brake device having a brake function (hereinafter referred to as a manual switch function) capable of generating braking force using a manual switch has been developed. This means that even if the driver does not press the brake pedal, if the manual switch is turned on, the brakes will automatically work under the given conditions and bring the vehicle to a smooth stop. [Problem to be solved by the invention] However, the braking distance at this time is uniquely determined by the vehicle speed at the time when the brakes start to be applied, and cannot respond to changes in the situation during braking. . For this reason, conventionally, it has required considerable skill to fully utilize this manual brake function. In view of the above circumstances, it is an object of the present invention to provide a vehicle brake device with a manual brake function that can respond to changes in surrounding conditions. [Means for Solving the Problem] In order to achieve the above object, the present invention includes a booster that drives a master cylinder in response to input from a brake pedal operated by a foot, and the booster includes a Accordingly, in a vehicle braking device equipped with a control chamber capable of adjusting the driving force of the master cylinder by the booster, a valve that can be switched to change the air pressure of the control chamber, and a valve near the handle are provided. a manual operating means that is provided and capable of detecting the amount of operation or operating force; and a manual operating means that switches the valve according to a detection signal from the manual operating means and adjusts the air pressure in the control chamber. and a controller that generates a braking force according to the amount of operation or force of the operation. [Operation] According to the vehicle braking device of the present invention, when the manual operating means provided near the handle apart from the brake pedal is operated, the controller generates a detection signal of the operating amount or operating force of the manual operating means. Then, by switching the valve, the air pressure in the control chamber of the booster is adjusted, and the booster is caused to generate a braking force in accordance with the operating amount or operating force of the manual operating means. [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The details of the booster 1 shown in this figure can be found in the patent application filed in 1982, which was previously proposed by the applicant of the present invention.
No. 14063, and an overview will be given here.
Inside the booster (vacuum booster) 1, a constant pressure chamber A is created at the front (left side of the figure) by a power piston 2.
However, an operating pressure chamber B is defined at the rear, and the chamber A is communicated with a vacuum source via a connection port 3. When the brake pedal B is depressed, the input shaft 4 is pushed forward, and the plunger 5 moves forward accordingly. Then, the atmosphere is introduced into the working pressure chamber B through the passage 6, and this atmospheric pressure causes the power piston 2 to
moves forward, and this pressing force is transmitted to the output shaft 7. In this way, the force applied to the input shaft 4 is amplified within the booster 1 and transmitted to the output shaft 7, and the master cylinder MC is driven with a large force. As a result, the brake is activated and braking force is applied. on the other hand,
When the brake pedal B is released, the plunger 5 moves rearward due to the reaction force from the output shaft 7. Then, constant pressure chamber A and working pressure chamber B are connected via passages 8 and 6.
As a result, the pressures in both chambers A and B become equal, the power piston 2 moves rearward, and the brake is released. Further, a space 9 is formed within the power piston 2. In this space 9, a constant pressure chamber C is defined in the front by a control piston 10, and an operating pressure chamber D is defined in the rear. It is maintained. On the other hand, the chamber D communicates with a connection port 13 via a passage 12, and this connection port 13 communicates with one supply/discharge port of the electromagnetic valve 14. Furthermore, the other supply/discharge port of this electromagnetic valve 14 is connected to the electromagnetic valve 1
This electromagnetic valve 15
The exhaust port of is connected to a vacuum source via a throttle valve 16. Further, the air supply port of the electromagnetic valve 15 is communicated with the atmosphere via the throttle valve 17. Therefore, when the solenoid valves 14 and 15 are respectively off and on, the throttle valve 17 → the solenoid valve 1
Atmospheric air is supplied to the operating pressure chamber D through 5→electromagnetic valve 14→connecting port 13, and this atmospheric pressure causes the control piston 10 to move forward, and accordingly, the plunger 5 moves forward. Then, as in the case described above, the atmosphere is introduced into the chamber B, and the power piston 2 is pushed forward. As a result, braking force is applied even without pressing the brake pedal BP. On the other hand, the electromagnetic valve 14,1
5 are off and off, the air in the working chamber D is absorbed into the vacuum source through the connection port 13 → solenoid valve 14 → solenoid valve 15 → throttle valve 16, and the control piston 10 moves rearward, causing the control piston 10 to move backward. Power decreases. Furthermore, when the electromagnetic valves 14 and 15 are respectively on and off, the connection port 13 is connected to the electromagnetic valve 1.
4, and the braking force is maintained. These are summarized in Table 1.

〔Effect of the invention〕

As explained above, according to the present invention, when the manual operating means provided near the steering wheel in addition to the brake pedal is operated, the controller responds to the detection signal of the operating amount or operating force of the manual operating means. By switching the valve, the air pressure in the control chamber of the booster is adjusted, and the booster generates a braking force in accordance with the amount or force of operation of the manual operation means. Therefore, by changing the amount of operation or the magnitude of the operating force of the manual operation means according to changes in the surrounding situation, the driver can generate a braking force that corresponds to the change in the surrounding situation. The operability of the brake by the operating means is dramatically improved, making it easier to use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention, FIG. 2 is a schematic diagram showing the structure of a manual switch, and FIGS. 3 and 4 are diagrams for explaining the operation of the same embodiment. Flowchart and graph. 19...Manual switch, 14, 15...Solenoid valve, 27...Controller (above 14, 15,
17 is a braking force control means), C...constant pressure chamber, D...
Working pressure chamber (C and D are control chambers).

Claims (1)

[Scope of Claims] 1. A booster that drives a master cylinder in response to input from a brake pedal operated by a foot, and the booster has a driving force for driving the master cylinder by the booster depending on changes in air pressure. A vehicle brake system equipped with a control chamber that can adjust the pressure of the control chamber includes a valve that can be switched to change the air pressure in the control chamber, and a manual valve that is provided near the handle and that can detect the amount or force of operation. according to an operating means and a detection signal from the manual operating means,
A vehicle braking device characterized by comprising: a controller that switches the valve, adjusts the air pressure in the control chamber, and generates a braking force according to the operating amount or operating force of the manual operating means.