JP2573249Y2 - Brake control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a motor vehicle, and more particularly to a brake control device for automatically braking a vehicle.

[0002]

2. Description of the Related Art A conventional automatic braking device for a vehicle is disclosed in Japanese Patent Application Laid-Open No. 2-162500.

The automatic brake device described in the above publication has a distance measuring means for measuring an inter-vehicle distance to a vehicle traveling ahead, a speed measuring means for measuring its own speed, this distance measuring means and a speed measuring means. And a computing device for computing the output signal from the computing device, and the value computed by the computing device is
If the predetermined safety range is exceeded, an output signal output from the arithmetic unit activates an alarm device and a braking device, thereby notifying the boarding vehicle of danger and automatically braking the vehicle.

[0004]

The above-mentioned conventional automatic braking device is intended to automatically brake the vehicle when the distance between the vehicle and a vehicle traveling ahead exceeds a safe range. However, the automatic braking device has been activated. In such a case, the wheels may be locked, and there is a risk that the safety of the vehicle may be impaired, such as an increase in the braking distance due to the slip of the wheels and the spin of the vehicle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is a technical object of a vehicle provided with an automatic brake device to appropriately operate the automatic brake device, and to safely and reliably brake the vehicle. .

[0006]

SUMMARY OF THE INVENTION The present invention comprises an anti-lock portion 10 for preventing the wheels from locking during braking, and an automatic brake portion 20 for forcibly operating the brake depending on the distance between the vehicle and a vehicle traveling ahead. The anti-lock unit 10 includes a speed detecting means 12 for detecting a wheel speed.
And a first control unit 11 which receives a signal from the speed detection means 12 to calculate the possibility of locking the wheels during braking, and an instruction signal from the first control unit 11 to control the inside of the wheel cylinder 2 Modulator 13 for controlling pressure
Consists of a, the automatic brake unit 2 0, the inter-vehicle distance detecting means 22 for detecting the distance to the vehicle traveling ahead of the vehicle, the brake instruction signal by inputting a signal from the inter-vehicle distance detecting means 22 And a brake pressurizing device 23 that is activated by an instruction from the second control unit 21. The second control unit 21
Along with the distance information from the inter-vehicle distance detecting means 22, vehicle speed information, deceleration information, and obstacle information in the antilock unit 10 are input from the first braking unit 11, and the braking force is applied to the brake pressing device 23. A brake control device for a vehicle that instructs pressure / hold and stops the operation of the brake pressurizing device 23 when a failure in the antilock unit 10 is detected.

[0007]

The brake control device according to the present invention includes an automatic brake unit 20 for forcibly operating the brake depending on the distance between the vehicle and a vehicle traveling ahead, and an antilock unit 10 for preventing the wheels from being locked during braking. I have.

The output signal from the first control unit 11 of the antilock unit 10 is input to the second control unit 21 of the automatic brake unit 20.

As described above, since the automatic brake device and the anti-lock device are provided in combination in the brake control device, when the automatic brake is activated, the anti-lock device is also activated. The vehicle can be braked while preventing it. Then, since the wheels are braked at the optimum slip ratio by the anti-lock device, even when the vehicle ahead is suddenly braked, the own vehicle can be suddenly stopped at the shortest braking distance by the automatic brake.

When a failure occurs in the antilock unit 10, the first control unit 11 in the antilock unit 10
Is input by the second control unit 21 in the automatic brake unit 20 and the second control unit 21 stops the operation of the brake pressurizing device 23 so that only the automatic brake operates. The locking of the wheels that occurs due to this can be prevented.

[0011]

1 is a block diagram of a brake control device according to an embodiment of the present invention.

The brake control device according to the present embodiment includes an anti-lock unit 10 for preventing each wheel from being locked during braking,
The automatic braking unit 20 is provided in combination with an automatic brake unit 20 that forcibly activates a brake depending on the distance between the vehicle and a vehicle traveling ahead.

The antilock unit 10 includes a speed sensor 12 as a vehicle speed detecting means, a first control unit 11 which receives a signal from the speed sensor 12 and calculates a lock possibility of each wheel during braking. , The first control unit 1
And a modulator 13 which is activated by an instruction signal from the control unit 1.

When detecting the possibility of locking the wheels during braking, the anti-lock unit 10 controls a valve device (not shown) through a modulator 13 to maintain, contain, and reduce the hydraulic pressure in the wheel cylinder 2. Have.

The automatic braking section 20 receives an inter-vehicle distance sensor 22 as means for detecting an inter-vehicle distance between the own vehicle and a vehicle traveling ahead, and generates a brake instruction signal by inputting a signal from the inter-vehicle distance sensor 22. 2 and a brake pressurizing device 23 that is operated in accordance with an instruction from the second control unit 21.

The inter-vehicle distance sensor 22 is composed of, for example, an ultrasonic sensor, an infrared sensor, or the like. As shown in FIG.
It has a mechanism for measuring the distance x from the device 1.

The second control unit 21 includes a first control unit 1
The vehicle speed information, deceleration information, failure information in the antilock unit 10 and the like calculated in step 1 are input. The second control unit 21 performs a predetermined calculation process based on the information and the inter-vehicle distance information from the inter-vehicle distance sensor 22,
When the inter-vehicle distance becomes equal to or less than the threshold value, the brake pressurizing device 23 is operated.

The brake pressurizing device 23 intervenes in the hydraulic passage 3 from the master cylinder 1 to the modulator 13 to forcibly control the supply of brake fluid into the wheel cylinder 2. At this time, although not shown,
A mechanism for automatically stopping the supply of fuel to the power unit in response to an instruction from the accelerator pedal is provided.

When a failure occurs in the antilock unit 10, a signal of failure information is output from the first control unit 11, the alarm 5 is activated to warn the driver, and the brake pressurizing device 23 The operation of is stopped.

The speed sensor 12 detects the amount of wheel rotation per unit time and converts it into speed.

The alarm 5 is provided with an alarm by voice and an alarm device visually displayed together with the voice.

The first control unit 11 and the second control unit 21 are each formed of a microcomputer having a memory of, for example, 8 to 36 bits.

Next, a processing flow in the second control unit 21 of this embodiment will be described with reference to FIG.

First, the first control unit 1 is provided to the second control unit 21.
The vehicle speed v and the vehicle deceleration g calculated in 1 are input (301), and the inter-vehicle distance x detected by the inter-vehicle distance sensor 22 is input (302).

Then, it is determined whether or not a fault has occurred in the antilock unit 10 based on a fault signal from the first control unit 11 (303). May not operate normally, the automatic brake system is released (31
0), if the failure signal is “NO”, the second control unit 21
The constant K is read from the memory of, and the constant K is multiplied by the square of the vehicle speed v to calculate the distance threshold a (30).
4).

Here, the constant K is a weather condition, a vehicle size,
It can be changed depending on the number of passengers. Next, it is determined whether the actual inter-vehicle distance x is smaller than the distance threshold a (305). If the following distance x is larger than the threshold a, the automatic braking system is released because there is no danger of collision (310), and if the following distance x is equal to or less than the threshold a, the second control unit 21 The vehicle deceleration constant k
Is read, and it is determined whether or not the actual vehicle deceleration g is equal to or less than the deceleration constant k (306). When the deceleration g is larger than the deceleration constant k, the brake pressurizing device 23
(307), and the brake pressurizing device 23 activates the modulator 13 to supply the brake fluid to the wheel cylinder 2 in response to the pressurizing command signal, thereby forcibly braking the vehicle. I do. If the deceleration g is equal to or less than the deceleration constant k, there is no danger of collision even if the brake is not pressurized, so that the brake is kept as it is.

Then, when the vehicle stops, the automatic brake system is released (309, 310).

As described above, in this embodiment, since the automatic brake unit 10 and the antilock unit 20 have a system configuration in cooperation, safe and reliable brake braking can be realized.
In addition, the parts can be shared by both parties, and the size of the entire system can be reduced.

In this case, the control units 11 and 21 of the antilock unit 10 and the automatic brake unit 20 may function as one central control unit without being separated.

Further, in addition to the operation of the brake pressurizing device 23, an alarm other than the failure alarm of the antilock unit may be issued to the boarding vehicle.

Further, the automatic brake is activated only when the driver operates the brake pedal or operates the engine brake for decelerating at a certain speed or more, and only assists the driver's own braking operation. The automatic brake may be operated at the same time.

[0032]

According to the present invention, when the automatic brake device is operated, the brake can be operated while reliably preventing the wheels from being locked by the anti-lock device.
Therefore, even in the case where the wheels are braked at the optimum slip ratio and the vehicle ahead is suddenly braked, it is possible to stop at the shortest braking distance by the automatic brake, and there is no danger of spin etc. due to locking of the wheels. Thus, safe and reliable braking of the vehicle can be performed.

Further, when the antilock device does not operate normally, the accident due to sudden braking can be prevented by stopping the automatic brake device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a brake control device according to an embodiment of the present invention.

FIG. 2 shows an inter-vehicle distance sensor (inter-vehicle distance detecting means) according to the embodiment;
FIG.

FIG. 3 is a flowchart showing a processing procedure in a control unit of the embodiment.

[Explanation of symbols]

 1. Master cylinder 2. Wheel cylinder 3. Hydraulic path 5. Alarm device 10. Antilock unit 11. First control unit 12. Vehicle speed detection means (speed sensor) 13. Modulator 20 automatic brake unit 21 second control unit 22 inter-vehicle distance detecting means (inter-vehicle distance sensor) 23 brake pressurizing device 31 forward vehicle 32 own vehicle

Claims (1)

(57) [Scope of request for utility model registration] An anti-lock section (10) for preventing locking of wheels at the time of braking; and an automatic brake section (20) forcibly applying a brake depending on a distance between the vehicle and a vehicle traveling ahead. The anti-lock unit (10) is provided with a speed detecting means (12) for detecting a wheel speed, and a first signal for inputting a signal from the speed detecting means (12) to calculate a lock possibility of the wheel during braking. The automatic brake unit ( 20 ) includes a control unit (11) and a modulator (13) that controls the pressure in the wheel cylinder (2) according to an instruction signal from the first control unit (11). An inter-vehicle distance detecting means for detecting an inter-vehicle distance to a vehicle traveling ahead of the vehicle (22)
And a second control unit (21) for inputting a signal from the inter-vehicle distance detecting means (22) to generate a brake instruction signal.
And a brake pressurizing device (23) that is operated in accordance with an instruction from the second control unit (21). The second control unit (21) is configured to receive a signal from the inter-vehicle distance detection means (22). Along with the distance information, the first control unit (11) controls the vehicle speed information, the deceleration information, and the antilock unit (1).
0) is input to instruct the brake pressurizing device (23) to pressurize and hold the brake pressurizing device (23), and when a fault in the antilock unit (10) is detected, the brake pressurizing device (23) is detected. A brake control device for a vehicle, wherein the operation of the vehicle is stopped.