JP2573250Y2 - 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 Conventionally, as disclosed in Japanese Patent Application Laid-Open No. Sho 62-71727, an automatic braking device for a vehicle has a distance measuring means for measuring an inter-vehicle distance to a vehicle traveling ahead and a self-speed measuring device. Speed measuring means, and a calculating device for calculating output signals from the distance measuring means and the speed measuring means. If the value calculated by the calculating device exceeds a predetermined safe range, the calculating device There has been an automatic brake device that activates a brake device by an output signal output from a vehicle and automatically brakes the vehicle.

On the other hand, an anti-lock brake control device is known as a mechanism for preventing locking of wheels during normal braking. A brake control device combining the above-mentioned automatic brake device and anti-lock control device is considered. When the distance between the vehicle and a vehicle traveling ahead exceeds a safe range, the vehicle is automatically braked, and the possibility of locking the wheels is further increased. When the value is calculated, the anti-lock control device operates to function to prevent the wheels from being locked together with the braking by the automatic brake device.

[0004]

However, in the automatic braking device, since the plane deceleration required for avoiding a collision is set in advance, the friction coefficient is so low that the road surface cannot exhibit the set vehicle deceleration. In the case of, there was a risk of colliding with the vehicle ahead.

[0005] Also, since the antilock control is a device that makes maximum use of the road surface μ except for a special road surface such as a gravel road or deep snow, the antilock control is performed in other words. This means that no further vehicle deceleration will occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve safety of a vehicle having an automatic brake device when the automatic brake device is operated.

[0007]

According to the present invention, there is provided a speed detecting means for detecting the speed of a wheel, and a signal for inputting a signal from the speed detecting means to calculate a lock possibility of the wheel during braking. Control unit 11 and first control unit 11
And a modulator 13 for controlling the pressure in the wheel cylinder 2 in accordance with an instruction signal from the
An inter-vehicle distance detecting means 22 for detecting an inter-vehicle distance between a vehicle traveling ahead and the host vehicle; a signal from the inter-vehicle distance detecting means 22 and a signal from the speed detecting means 12 or the first control unit 11 , An automatic brake unit 20 including a second control unit 21 that generates a brake instruction signal by inputting the first control signal and a brake pressurizing device 23 that is operated by an instruction from the second control unit 21; The brake control device includes an AND circuit 6 that inputs output signals from the control unit 11 and the second control unit 21 and an alarm device 5 that is activated by the output signal of the AND circuit 6.

[0008]

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 speed detecting means 12 of the antilock unit 10 is input to the first control unit 11 and also to the second control unit 21 of the automatic brake unit 20, or The output signal from the first control unit 11 is input to the second control unit 21.

When the anti-lock device is activated during the operation of the automatic brake, the first control unit 11 and the second
A signal is input to the AND circuit 6 from both of the control units 21, and the alarm device 5 is activated by a command signal from the AND circuit 6, and issues an alarm to the driver.

[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 each wheel at the time of 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 brake 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 controller 21 receives a signal from the speed sensor 12 and calculates speed information and deceleration information. The speed information and the deceleration information may be obtained by inputting the information calculated by the first control unit 11 to the second control unit 21. Then, the second control unit 21 performs a predetermined calculation process based on the speed information and the deceleration information and the inter-vehicle distance information from the inter-vehicle distance sensor 22 so that the inter-vehicle distance is equal to or less than the threshold value. When the brake pressure device 2
3 is activated.

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.

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

The brake control device includes an AND circuit 6 for inputting signals from the first control unit 11 and the second control unit 21, and operates by a signal from the AND circuit 6. An alarm device 5 is provided.
The alarm device 5 includes an alarm device by voice or an alarm device visually displayed together with the voice.

First control unit 11 and second control unit 21
Are constituted by microcomputers each having a memory, for example.

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

First, the speed sensor 12 is controlled by the second controller 21.
Vehicle speed v and vehicle deceleration g according to information input from
Is calculated (301), and the following distance sensor 22 is calculated.
Is calculated (302). The vehicle speed v and the vehicle deceleration g may be obtained by inputting the vehicle speed v and the vehicle deceleration g calculated by the first control unit 11 to the second control unit 21.

Then, a constant K is read from the memory of the second control unit 21, and the constant K is multiplied by v ² to calculate a distance threshold a (303).

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 value a (304). If the following distance x is larger than the threshold a, the automatic braking system is released because there is no danger of collision (313). 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 (305). When the deceleration g is equal to or smaller than the deceleration constant k, a pressurizing command is output to the brake pressurizing device 23 (306), and the brake pressurizing device 23 is output.
Operates the modulator 13 to supply the brake fluid to the wheel cylinder 2 in response to the pressurization command signal.
Forcibly brake the vehicle. If the deceleration g is larger than the deceleration constant k, there is no danger of collision without further pressurizing the brake, so that the brake is kept as it is (307).

The signal output from the second control unit 21 is also input to the AND circuit 6 at the stage (306, 307) of the command to the brake pressurizing device 23 in the above processing flow. At this time, the first controller 11 sends the modulator 1
When the command signal of the antilock control to 3 is input to the AND circuit 6, the AND circuit 6 outputs a command signal to the alarm device 5, and the alarm device 5 is activated (308, 309, 31).
0,311).

That is, the AND circuit 6 is connected to the first controller 1
A command signal to the alarm device 5 is output only when a signal is redundantly input from both the first and second control units 21.

Then, when the vehicle stops, the automatic brake system is released (312, 313).

As described above, in the present embodiment, when the anti-lock control is also activated during the operation of the automatic brake, the alarm device 5 is activated to issue an alarm to the driver. By this warning, the driver can recognize that the deceleration of the vehicle will not be further increased by the antilock control operation, and can perform a collision avoidance operation with the preceding vehicle, such as steering, passing headlights, and sounding a horn.

Antilock section 10 and automatic brake section 20
The control units 11 and 21 may function as a single central control unit without being separated from each other, and the alarm device 5 may be activated by a signal from the central control unit.

[0031]

According to the present invention, when the anti-lock device is activated while the automatic brake device is operating, an alarm device can issue a warning to the driving vehicle, thereby improving safety during operation of the automatic brake device. be able to.

[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 6. AND circuit 10. Antilock unit 11. First control unit 12. Vehicle speed detection means (speed 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] A speed detecting means (1) for detecting a speed of a wheel.
2), a first control unit (11) for inputting a signal from the speed detection means (12) to calculate the lock possibility of the wheel at the time of braking, and an instruction from the first control unit (11). An antilock unit (1) comprising a modulator (13) for controlling the pressure in the wheel cylinder (2) by a signal;
0), an inter-vehicle distance detecting means (22) for detecting an inter-vehicle distance between a vehicle traveling ahead and the host vehicle, and an inter-vehicle distance detecting means (2).
2) a second control unit (21) that receives a signal from 2) and a signal from the speed detection means (12) or the first control unit (11) to generate a brake instruction signal; An automatic brake unit (20) including a brake pressurizing device (23) activated by an instruction from the control unit (21); the first control unit (11) and the second control unit (21)
AND circuit (6) for inputting an output signal from the device, and an alarm device (5) activated by the output signal of the AND circuit (6)
And a brake control device.