JP2573252Y2 - 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.

[0003]

However, in the automatic braking device, since the vehicle deceleration required for collision avoidance is set in advance, if the road surface friction coefficient is lower than the considered friction coefficient value, or On the other hand, when the braking effect is poor, there is a risk that the vehicle will not collide with a preceding vehicle or an obstacle without achieving the set vehicle deceleration.

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.

[0005]

A solution for the present invention includes: a speed detection means to detect the vehicle speed, the headway distance detection means to detect an inter-vehicle distance between the vehicle and the vehicle traveling in front, the speed detection a centralized control unit for generating a brake command signal to input signal between the hand stage the headway distance detecting hand stage or, et al., the centralized control
Consists of a part or these are actuated by a command signal Lube rake pressurized圧装置及 <br/> beauty alarm equipment, the brake pressure device is a pressure
If the target deceleration is not reached after a certain period of time
Expediently, the actuation signal from the central control unit to the alarm equipment is
It is output.

[0006]

According to the brake control device of the present invention, the central control unit 6 outputs a signal to the brake pressurizing device 7 according to the distance between the vehicle and the vehicle running ahead, and forcibly operates the brake.

At this time, when the deceleration of the vehicle does not reach the calculated target deceleration, the central control unit 6 outputs a signal to the alarm device 8 to activate the alarm device 8.

[0008]

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 a speed sensor 1 as speed detecting means for detecting the speed of a vehicle body, and an inter-vehicle distance sensor 2 as inter-vehicle distance detecting means for detecting an inter-vehicle distance between a vehicle traveling ahead and the host vehicle.
And a central control unit (ECU) 6 that inputs information from the speed sensor 1 and the inter-vehicle distance sensor 2 to generate a brake instruction signal.

Further, a brake pressurizing device 7 and an alarm device 8 which are operated by an instruction signal from the central control section 6 are provided. 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 composed of, for example, an ultrasonic sensor, a laser radar, or the like. As shown in FIG. 2, the distance x between the own vehicle 32 and the preceding vehicle 31 is determined by a reflected wave or reflected light. It has a mechanism for measuring.

The central control section 6 is constituted by a microcomputer having a memory, for example. The centralized control unit 6 receives the signal from the speed sensor 1 and calculates speed information and deceleration information. The central control unit 6 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 so that the inter-vehicle distance becomes equal to or less than a threshold value. In this case, the brake pressurizing device 7 is operated.

When the brake pressurizing device 7 is operated as the automatic brake control as described above, the centralized control unit 6 operates when the actual target vehicle deceleration does not reach the calculated target vehicle deceleration. Activate the alarm device 8.

The brake pressurizing device 7 includes a master cylinder 1
Intervening in the hydraulic path 14 from 0 to the modulator 13,
The supply of the brake fluid into the wheel cylinder 12 is forcibly controlled. 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 alarm device 8 is provided with an alarm device by voice or an alarm device visually displayed together with the voice, and issues an alarm to the driver in response to a command from the central control unit 6. I have.

Next, a processing flow in the central control unit 6 of the present embodiment will be described with reference to FIG. First, the central control unit 6 determines the vehicle speed v based on the information input from the speed sensor 1.
The inter-vehicle distance x is calculated based on the information input from the inter-vehicle distance sensor 2 (301). Further, the vehicle speed v is differentiated with respect to time t, and a vehicle deceleration g is calculated (302).

The constant K is stored in the memory of the central control unit 6.
Read the _1, multiplied by v ² to the constant K _1, calculates the distance threshold a between the forward vehicle (303). Where the constant K ₁
Can be changed according to weather conditions, vehicle size, number of passengers, and the like.

Next, securely vehicle calculates a target vehicle deceleration g ₁ required to stop (304). Then, it is determined whether or not the actual inter-vehicle distance x is smaller than the distance threshold a (305). 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 (312). If the inter-vehicle distance x is equal to or smaller than the threshold a, calculation is performed in step (302). actual vehicle deceleration g was found determines whether it is the target vehicle deceleration g ₁ below, which is set at step (304) (30
6). Then, if the vehicle deceleration g is less than the target vehicle deceleration g ₁ outputs pressurized圧命decree to the brake pressure device 7 (307), the brake pressure device 7 by the pressurized圧命command signal, the modulator 13 Is operated to supply the brake fluid to the wheel cylinder 12, and the vehicle is forcibly braked. Further, the vehicle deceleration g is the greater than the target vehicle deceleration g _1, there is no risk of collision even further pressurized without a brake, holds the brake intact (308).

Next, it is determined whether or not the brake pressurization has been continued for a certain period of time after the brake pressurization is started in the step (307) (309). 8 to output a command signal to activate the alarm device 8 (310).

Then, when the vehicle stops, the automatic brake system is released (311 and 312). As described above, in this embodiment, if the actual vehicle deceleration does not reach the target vehicle deceleration for a certain period of time or more during the automatic braking operation, the alarm device 8 is activated to issue an alarm to the driver. With this warning, the driver can recognize that there is a danger of collision with the vehicle ahead or an obstacle, and can perform a collision avoidance operation with the vehicle ahead, such as steering, passing headlights, and sounding a horn. Also, at a certain time after the automatic brake starts operating
An alarm is issued if the target deceleration has not been reached even after
Delay in brake response immediately after the automatic braking is started
Time and the time it takes for the brakes to stabilize
Prevents the alarm device 8 from operating when the rake is unstable
can do.

[0020]

[Effect of the Invention] According to the present invention , a brake pressurizing device is added.
If the vehicle does not reach the target deceleration after a certain period of time from the start of pressure, an alarm is issued,
The alarm activates when the brake immediately after operation is unstable
Can be prevented and the braking effect is insufficient.
Can can issue a warning to ensure that the driver, in this
It is possible to further improve the safety of the automatic brake device in operation.

[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. Speed detection means (speed sensor) 2. Inter-vehicle distance detection means (inter-vehicle distance sensor) 6. Central control unit (ECU) 7. Brake pressurizing device 8. Alarm device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60T 8/32 B60T 7/12 B60T 17/22

Claims (1)

(57) [Scope of request for utility model registration] 1. A and speed detection means to detect a vehicle speed,
A headway distance detection means to detect an inter-vehicle distance between the vehicle and the vehicle running ahead, the brake instruction signal to input signal of said speed detection hand stage the headway distance detection <br/> hand stage or al a central control unit to be generated, the central control unit is operated by either et instruction signal consists of a lube rake pressurized圧装置及 beauty alarm equipment, a predetermined time after the brake pressure device starts pressurization Passage
If the target deceleration is not reached later, the central control unit
Brake control apparatus characterized by actuation signal to et the alarm equipment is output.