JP2568115Y2 - 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. Also, a traction brake control device is known as a mechanism for preventing acceleration slip of wheels when the vehicle starts moving.

[0004] A brake control device combining the above-mentioned automatic brake device with an anti-lock control device and a traction control device is considered. When the inter-vehicle distance to a vehicle traveling ahead exceeds a safe range, the vehicle is automatically braked. When the lock possibility of the wheel is calculated, the anti-lock control device is activated to function to prevent the wheel from being locked together with the braking by the automatic brake device, and to prevent the wheel from slipping at the time of starting.

[0005]

However, in the conventional automatic braking device for a vehicle, the stop lamp does not light when the automatic braking device is activated. For this reason, the fact that the vehicle is decelerated by the operation of the automatic braking device becomes difficult to be recognized by the driver of the vehicle behind, and in some cases, there is a risk of a collision.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the safety of vehicle running in a vehicle brake control device that performs automatic brake control.

[0007]

SUMMARY OF THE INVENTION The present invention provides a speed detecting means (1) for detecting the speed of a wheel, and an inter-vehicle distance detecting means (2) for detecting an inter-vehicle distance between a vehicle traveling in front and a host vehicle.
And a brake fluid pressure detecting means (3).
0), a modulator (6) for controlling the pressure in the wheel cylinder (4), and an actuator (7) for automatically controlling the pressure in the modulator (6). A stop lamp (8) for warning the vehicle backward, and the speed detecting means (1).
A traction control unit (11) for calculating the acceleration slip of the wheel by inputting a signal from the vehicle, and the speed detection means (1)
An anti-lock control unit (12) for calculating a lock possibility of a wheel by inputting a signal from a vehicle, and the speed detecting means (1)
And an automatic brake control unit (1) which receives a signal from the inter-vehicle distance detecting means (2) and generates a brake instruction signal.
3), and a logical product of a signal from the brake fluid pressure detecting means (3) and an inverted signal from the traction control section (11) is calculated to calculate the stop lamp (8). ) And an AND circuit (21) for outputting the result. The present invention also provides a speed detecting means (1) for detecting a wheel speed, an inter-vehicle distance detecting means (2) for detecting an inter-vehicle distance between a vehicle traveling in front and the host vehicle, and a brake pedal switch (5). , A modulator (6) for controlling the pressure in the wheel cylinder (4), and an actuator (7) for automatically controlling the pressure in the modulator (6). A control unit (50), a stop lamp (8) for warning rearward of braking of the vehicle, and a traction control unit (11) that receives a signal from the speed detection means (1) and calculates an acceleration slip of the wheel. An anti-lock control unit (12) for inputting a signal from the speed detecting means (1) to calculate the possibility of locking the wheels; the speed detecting means (1) and the inter-vehicle distance detecting means (2)
And a control unit section (40) including an automatic brake control section (13) for generating a brake instruction signal by inputting a signal from the controller. The stop lamp (8) includes the brake pedal (5) and the brake pedal (5). A signal from the automatic brake control unit (13) is input, and a signal from the traction control unit (11) is not input.

[0008]

In the brake control device according to the present invention, when the brake fluid pressure detecting means 3 detects a change in the brake fluid pressure, that is, when the automatic brake control unit 13 is operated, the logical product from the brake fluid pressure detecting means 3 is obtained. An ON signal is input to the circuit 21. At this time, the traction control unit 1
When 1 is stopped, an inverted signal of the off signal, that is, an on signal, is input from the traction control unit 11 to the AND circuit 21. As a result, an ON signal is output from the AND circuit 21, and the stop lamp 8 is turned on. When the traction control unit 11 is activated when the automatic brake control unit 13 is activated, an ON signal and an inverted signal of the ON signal, that is, an OFF signal are output from the brake fluid pressure detection means 3 and the traction control unit 11, respectively, by an AND circuit. 21
Is input to the stop lamp 8 from the AND circuit 21, the stop lamp 8 is turned off.

In the brake control device according to the present invention, when the brake pedal switch 5 is operated or the automatic brake control unit 13 is operated, an ON signal is input to the stop lamp 8 from each of them, and the stop lamp 8 is turned on.
Lights up. The traction control unit 11 becomes independent of the stop lamp 8.

[0010]

FIG. 1 is a block diagram of a brake control device according to a first embodiment of the present invention. The brake control device according to the present embodiment generates a detection unit 30 for obtaining information necessary for brake control, a brake pressure control unit 50 for controlling brake fluid pressure, a stop lamp 8, and a brake control instruction signal. And a control unit 40.

The detecting unit 30 includes a speed sensor 1 as a speed detecting means for detecting the speed of the wheel, and an inter-vehicle distance sensor 2 as an inter-vehicle distance detecting means between the own vehicle and a vehicle traveling ahead.
And a brake fluid pressure sensor 3 (brake operation detecting means 90) as a brake fluid pressure detecting means for detecting a brake fluid pressure state of the wheel brakes.

The speed sensor 1 detects the amount of wheel rotation per unit time and converts it into speed. The inter-vehicle distance sensor 2 is constituted by, for example, an ultrasonic sensor, an infrared sensor, or the like, and as shown in FIG. 3, a mechanism for measuring a distance x between the own vehicle 32 and the preceding vehicle 31 by a reflected wave or reflected light. It has.

The brake fluid pressure sensor 3 has a device that responds to a change in the pressure of the brake fluid of the wheel brake. The brake pressure control unit 50 includes a modulator 6 for controlling the fluid pressure into the wheel cylinder 4 and an automatic brake actuator 7 for forcibly controlling the pressure in the modulator 6.

The automatic brake actuator 7 intervenes in a hydraulic path from a master cylinder (not shown) to the modulator 6 to forcibly control the supply of brake fluid into the wheel cylinder 4. At this time, although not shown, a mechanism is provided for automatically stopping fuel supply to the power unit according to an instruction from the accelerator pedal.

The stop lamp 8 is turned on during braking of the vehicle to call attention to a following vehicle. The control unit 40 includes a traction control unit (ECU) 11 that determines the acceleration slip of the wheels at the time of starting based on a signal from the speed sensor 1, and locks each wheel during braking with a signal from the speed sensor 1. An anti-lock control unit (ECU) 12 for calculating the characteristics and signals from the speed sensor 1 and the inter-vehicle distance sensor 2,
An automatic brake control unit (ECU) 13 for calculating the risk of collision with a vehicle ahead or an obstacle.

Each of the traction control unit 11, the antilock control unit 12, and the automatic brake control unit 13 is composed of, for example, a microcomputer having a memory.

The traction control unit 11 receives a signal from the speed sensor 1 and calculates an acceleration slip state of each wheel on the driving wheel side. Then, the automatic brake actuator 7 and the modulator 6 are operated.

The antilock controller 12 receives a signal from the speed sensor 1 and calculates speed information and deceleration information. Then, the antilock control unit 12
Performs predetermined arithmetic processing based on the speed information and the deceleration information, calculates the lock possibility of each wheel, and activates the modulator 6.

Further, the automatic brake control unit 13 includes:
A signal from the speed sensor 1 is input, and speed information and deceleration information are calculated. Then, the automatic brake control unit 13
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 2 and, when the inter-vehicle distance becomes equal to or less than a threshold value, an automatic brake actuator. 7 is activated.

The brake control device of the present embodiment includes a first AND circuit 21 for inputting signals from the brake fluid pressure sensor 3 and the traction control unit 11. The stop lamp 8 is operated by the signal from the controller. The first AND circuit 21
Thus, the stop lamp 8 does not operate during the traction control.

Here, the traction control unit 11 sends the first
The signal to the AND circuit 21 is input after the positive logic is converted to the negative logic. In addition, the brake control device includes a second AND circuit 22 that inputs signals from the brake fluid pressure sensor 3 and the antilock control unit 12. When the signal from the brake fluid pressure sensor 3 and the signal from the antilock control unit 12 are input to the second AND circuit 22 in an overlapping manner, the second AND circuit 22 outputs a signal to the modulator 6. That is, when the lock possibility of each wheel is detected in the state where the brake is being braked, the valve device (not shown) is controlled through the modulator 6,
The anti-lock control is performed by holding, containing, and reducing the liquid pressure in the wheel cylinder 4.

Next, a processing flow at the time of the automatic brake control of this embodiment will be described with reference to FIG. First, the automatic brake control unit 13 calculates the vehicle speed v and the vehicle deceleration g based on the information input from the speed sensor 1 (301), and calculates the inter-vehicle distance x detected by the inter-vehicle distance sensor 2 (301). 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 antilock control unit 12 to the automatic brake control unit 13.

Then, a constant K is read from the memory of the automatic brake control unit 13, and the constant K is multiplied by v ² to calculate a distance threshold a (303). Here, the constant K can be changed according to weather conditions, the size of the vehicle, the number of passengers, and the like.

Next, it is determined whether the actual inter-vehicle distance x is smaller than the distance threshold value a (304). If the inter-vehicle distance x is larger than the threshold a, the automatic braking system is released because there is no danger of collision (317),
When the inter-vehicle distance x is equal to or smaller than the threshold a, the vehicle deceleration constant k is read from the memory of the automatic brake control unit 13 and it is determined whether or not the actual vehicle deceleration g is equal to or smaller 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 automatic brake actuator 7 (306), and the automatic brake actuator 7 pressurizes the interior of the modulator 6 by the pressurizing command signal. Thus, the brake fluid is supplied to the wheel cylinder 4 to 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).

Next, when the antilock control unit 12 calculates the possibility of locking the wheels during the automatic braking operation, the antilock control unit 12 outputs a signal to the second AND circuit 22. Since the signal from the brake fluid pressure sensor 3 is also input to the second AND circuit 22 from the command stage (306, 307) to the automatic brake actuator 7, the second AND circuit 22 includes a modulator. The controller 6 outputs a command signal to the modulator 6 to appropriately control the modulator 6 to perform antilock control (308, 309, 310, 311).

Then, when the vehicle stops, the automatic brake system is released (312, 313). At the stage when the brake is pressurized in this processing flow (306), the stop lamp 8 is turned on by the signal from the first AND circuit 21 even if the driver does not operate the brake.

Next, the processing flow of the first AND circuit 21 will be described with reference to FIG. In the first AND circuit 21, it is first determined from the signal from the brake fluid pressure sensor 3 whether or not the brake actuation signal is ON (2).
01). If the brake operation signal is OFF, the stop lamp 8 is not turned on (204). If the brake operation signal is ON, the traction control unit 11 is turned off.
It is determined whether the traction control signal is in the OFF state on the basis of the signal from (step 202). If the traction control signal is OFF, a command signal is output to the stop lamp 8 to turn on the stop lamp 8 (203). If the traction control signal is ON, the stop lamp 8 is not turned on (204).

That is, the first AND circuit 21 outputs a command signal to the stop lamp 8 only when the brake operation ON signal and the traction control OFF signal are inputted in an overlapping manner. Therefore, when the traction control is being performed, no command signal is output to the stop lamp 8, and the stop lamp 8 is not turned on.

As described above, according to the present embodiment, in addition to the stop lamp being turned on by the driver's operation of the brake pedal, the stop lamp is also turned on when the automatic brake is activated and the antilock control is activated. To alert the driver of the vehicle and to turn off the stop lamp when the traction control is activated, and to show the intention of starting to the vehicle behind, greatly reducing the risk of collision from the vehicle behind. Can be.

Further, the traction control unit 11, the antilock control unit 12, and the automatic brake control unit 13 may be formed as a single centralized control unit without being separated.

[0031]

Second Embodiment Next, a second embodiment of the present invention will be described. FIG. 2 is a block diagram of a brake control device according to a second embodiment of the present invention.

In this embodiment, the same reference numerals as those in the first embodiment denote the same parts, and a description thereof will be omitted. The brake control device according to the present embodiment generates a detection unit 30 for obtaining information necessary for brake control, a brake pressure control unit 50 for controlling brake fluid pressure, a stop lamp 8, and a brake control instruction signal. Control unit 4
0.

The detecting unit 30 includes a speed sensor 1, an inter-vehicle distance sensor 2, and a brake pedal switch 5 (a brake operation detecting means 9) for outputting a signal by operating a brake pedal.
0).

The brake pedal switch 5 outputs a signal to the stop lamp 8 when the driver operates the brake pedal to turn on the brake pedal switch 5. The stop lamp 8 receives the signal from the brake pedal switch 5 and lights up.

The brake pressure control unit 50 comprises a modulator 6 and an automatic brake actuator 7. The control unit 40 includes a traction control unit (ECU) 11 and an antilock control unit (EC).
U) 12 and an automatic brake control unit (ECU) 13.

The brake control device of this embodiment includes the brake pedal switch 5 and the automatic brake control unit 1.
3 is provided with a logical sum circuit 25 for inputting a signal from the control circuit 3.
When a signal from at least one of the signal from the brake pedal switch 5 and the signal from the automatic brake control unit 13 is input to the logical sum circuit 25, the logical sum circuit 25 sends a signal to the second logical product circuit 22. Is output.
The second AND circuit 22 outputs a signal to the modulator 6 when a signal from the OR circuit 25 and a signal from the antilock control unit 12 are input in an overlapping manner.

That is, this brake control device is used for normal brake braking by driver's operation of the brake pedal.
Alternatively, when the lock possibility of each wheel is detected in a state where the automatic brake braking is performed, the modulator 6 is operated to perform the anti-lock control.

In this embodiment, the signal from the automatic brake control unit 13 is output to the stop lamp 8 in addition to the output to the OR circuit 25 and the automatic brake actuator 7. Therefore, even when the driver does not operate the brake pedal, the stop lamp 8 is turned on when the automatic brake control is performed.

The signal from the traction control unit 11 is output to the modulator 6 and the automatic brake actuator 7 to perform traction control only, and is not output to the stop lamp 8, so that the traction control is independent of the stop lamp 8. .

The processing flow at the time of the automatic brake control in this embodiment is the same as the processing flow of FIG. 4 in the above-described first embodiment when antilock control is performed (308, 309,
310, 311), except that the second AND circuit 22 inputs a signal from the OR circuit 25 which outputs a signal in response to an input signal from the brake pedal switch 5 or the automatic brake control unit 13, Will be the same. In this embodiment, when the brake shown in FIG.
6) Even if the driver does not operate the brake, the signal from the automatic brake control unit 13 is input to the stop lamp 8, and the stop lamp 8 is turned on.

As described above, in the second embodiment, only the signal from the brake pedal switch 5 and the signal from the automatic brake control unit 13 are directly output to the stop lamp 8. As a result, the brake control device of the present embodiment
In addition to turning on the stop lamp at the time of normal braking by the driver's operation of the brake pedal, the stop lamp 8 is also turned on at the time of automatic braking operation. Further, since the traction control is not related to the stop lamp 8, the stop lamp 8 is not turned on at the time of starting.

[0042]

According to the present invention, in addition to turning on the stop lamp during normal braking, the stop lamp 8 is also used during automatic braking and antilock braking.
Is turned on, and the stop lamp 8 is turned off even when the traction brake is being braked, even during the brake braking, so that the safety of running the vehicle can be improved. According to the present invention, in addition to the stop lamp lighting when the driver operates the brake pedal, the stop lamp 8 is also turned on when the automatic brake braking and the antilock brake are braked, and the traction braking is performed when the stop lamp 8 is turned on. Since it becomes irrelevant, the safety of running the vehicle can be improved.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of a brake control device according to a second embodiment of the present invention.

FIG. 3 is an inter-vehicle distance sensor (inter-vehicle distance detecting means) according to the embodiment
FIG.

FIG. 4 is a flowchart showing a processing procedure in a control unit of the embodiment.

FIG. 5 is a flowchart showing a processing procedure in a first AND circuit of the embodiment.

[Explanation of symbols]

 1. Speed detecting means (speed sensor) 2. Inter-vehicle distance detecting means (inter-vehicle distance sensor) 3. Brake fluid pressure detecting means (brake fluid pressure sensor) 4. Wheel cylinder 5. Brake pedal switch 6. Modulator 7 Automatic brake actuator 8 Stop lamp 11 Traction control unit 12 Antilock control unit 13 Automatic brake control unit 21 Logic circuit (first AND circuit) 30 Detector 40 ..Control unit section 50.Brake pressure control section 90..Brake operation detection means

Claims (2)

(57) [Scope of request for utility model registration] 1. A speed detection means for detecting the speed of the wheel (1), and inter-vehicle distance detecting means for detecting an inter-vehicle distance between the vehicle and the vehicle traveling in front (2), brake fluid pressure detecting means ( 3 ) a detector (30), a modulator (6) for controlling the pressure in the wheel cylinder (4), and an actuator (7) for automatically controlling the pressure in the modulator (6) . A brake pressure control unit (50), a stop lamp (8) that warns rearward of braking of the vehicle, and a traction control unit (4) that receives a signal from the speed detection unit (1) and calculates an acceleration slip of the wheel. 11)
An anti-lock control unit (12) that receives a signal from the speed detection unit (1) and calculates a lock possibility of a wheel;
Said speed detecting means (1) and the inter-vehicle distance detecting means (2) by inputting a signal from the automatic brake control unit for generating a brake command signal (13) from become control unit portion (40), the brake fluid The signal from the pressure detecting means (3) and the
Logical AND with the inverted signal from the operation control unit (11).
AND circuit for calculating and outputting to the stop lamp (8)
(21) A brake control device comprising: 2. Speed detecting means for detecting a speed of a wheel.
(1) and the inter-vehicle distance between the vehicle traveling ahead and the vehicle
The inter-vehicle distance detecting means (2)
A detection unit (30) comprising a switch (5); Modulator for controlling pressure in wheel cylinder (4)
(6) and the pressure in this modulator (6) is automatically
Brake pressure control consisting of an actuator (7) to be controlled
Control unit (50); A stop lamp (8) that warns rearward of vehicle braking, A signal from the speed detecting means (1) is input to
A traction control unit (11) for calculating a speed slip;
The signal from the speed detecting means (1) is input to
An anti-lock control unit (12) for calculating a lock possibility;
The speed detecting means (1) and the inter-vehicle distance detecting means
Input the signal from (2) to generate the brake instruction signal
Control consisting of an automatic brake control unit (13)
Unit ( 40) The stop lamp (8) includes the brake pedal
(5) and a signal from the automatic brake control unit (13)
And a signal from the traction control unit (11)
A brake control device characterized by not inputting a brake.