JP2009248706A - Brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake device for advancing the start of a forcible braking operation by forcing the braking operation based on an accelerating operation even when an operator paroxysmally steps on a gas pedal under a high possibility of collision. <P>SOLUTION: The brake device includes a braking object collision unavoidable detecting means against an objection with a braking object in which a vehicle concerned collides against a front braking object with a high possibility, a brake standby means for establishing a standby state for executing a forcible braking operation, a forcible braking means for performing a forcible braking operation from the standby state of the brake standby means when an inter-vehicular distance of the vehicle becomes a predetermined distance after the detection of the possible collision by the braking object collision unavoidable state detecting means, and a forcible braking operation determining means for performing a forcible braking operation by the forcible braking means when an accelerating operation is greater than a predetermined operating amount before the braking operation by the forcible braking means after the detection of the possible collision by the braking object collision unavoidable state detecting means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a brake device.

Conventionally, it has means for detecting the relative distance to the braking object in front of the vehicle, performs brake preload based on the relative distance, and exerts braking force even with a short braking operation and less force, to reduce the impact in collision, There is known a brake device including a pre-crash system that automatically applies a brake when a relative distance is high where there is no brake operation by an operator and the possibility of a collision is high (for example, see Patent Document 1).
JP 2000-309257 A

  However, in the brake device of the conventional example, the operator intends to perform the brake operation after the brake preload is performed based on the relative distance to the braking object in front of the vehicle and before the forced brake operation is performed. Then, there is a possibility of depressing the accelerator pedal.

  A problem to be solved by the present invention is a brake device capable of accelerating the start of a forced braking operation based on the accelerator operation even when the operator steps on the accelerator in a state where there is a high possibility of a collision. Is to provide.

  In order to solve the above problem, the brake device according to claim 1 is a braking object collision inevitable detecting means for detecting a case where the host vehicle collides with a front braking object with high possibility, and a preparation for performing a forced braking operation. A brake standby means for making a state, and a forced brake means for forcibly performing a braking operation from the preparation state of the brake standby means when the distance between the vehicle and the host vehicle reaches a predetermined distance after the collision determination by the braking object collision unavoidable detection means, Forcible brake operation determining means for performing a forced braking operation by the forced braking means when the accelerator operation is greater than or equal to a predetermined operation after the collision is determined by the braking object collision inevitable detecting means and before the braking operation by the forced braking means. It was set as the characteristic feature.

  In the brake device of the present invention, as described above, if the accelerator operation is greater than or equal to the predetermined operation before the braking operation by the forced braking means after the collision determination by the braking object collision inevitable detecting means, the forced braking by the forced braking means is performed. By providing a forced brake activation judgment means to perform the action, even if the operator steps on the accelerator in a state where there is a high possibility of a collision, the result is a forced braking operation, and the forced braking operation An effect is obtained that the start of the braking operation can be accelerated.

  Embodiments of the present invention will be described below with reference to the drawings.

The brake device of this embodiment corresponds to the invention described in claims 1 to 3.
First, the brake device of an Example is demonstrated based on drawing.
FIG. 1 is a system block diagram showing a brake device of an embodiment. FIG. 2 is a flowchart showing the contents of forced brake operation determination control of the brake device of the embodiment. FIG. 3 is a time chart showing an example of an accelerator operation state in the forced brake operation determination.

  As shown in the block diagram of FIG. 1, the brake device includes a braking object detection sensor 1, a vehicle speed sensor 2, a pre-crash controller 3, a brake controller 4, a brake actuator 5, and an accelerator pedal position sensor 6. The engine controller 7, the electronic throttle 8, and the brake pedal position sensor 9 are provided.

  More specifically, the pre-crash controller 3 includes information on the relative distance from the braking object detected by the braking object detection sensor 1, the vehicle speed signal detected by the vehicle speed sensor 2, and the accelerator detected by the accelerator pedal position sensor 6. The pedal position signal and the brake pedal position signal detected by the brake pedal position sensor 9 are input.

As the braking object detection sensor 1, a radar device is used.
The radar apparatus has a rotating polygon mirror having a plurality of mirror surfaces tilted at various angles. The semiconductor laser diode and the collimator lens are disposed above the polygon mirror. The infrared pulse beam (emitted from the laser diode) is directed upwards in front of the polygon mirror so that the pulse beam is directed obliquely downward to the rotating polygon mirror and the pulse beam is reflected as a transmission beam that travels toward the front measurement area. The light is reflected by a reflecting mirror arranged at a location. The optical receiving apparatus receives a transmission beam reflected from an object existing inside the measurement region. By using a rotating polygon mirror, it is possible to perform two-dimensional scanning ahead, and by rotating the polygon mirror, the pulse beam can be horizontally swung, and the pulse mirror can be swung vertically by the polygon mirror surface tilted at various angles. Is possible. Depending on the time between the transmission of the pulse beam and the reception of the reflected beam, the calculation circuit determines the distance, angle and relative speed with respect to the detected preceding vehicle.

  Then, the pre-crash controller 3 uses the relative distance information with respect to the braking object input from the braking object detection sensor 1 and the vehicle speed signal at that time input from the vehicle speed sensor 2 to cause a collision with the braking object. Judging.

A pressure signal and a brake operation signal are input from the pre-crash controller 3 to the brake controller 4.
Then, the brake controller 4 outputs a pressurization command signal and a brake operation command signal to the brake actuator 5.

The engine controller 7 receives a pedal position signal detected by the accelerator pedal position sensor 6 and a throttle cancel signal from the pre-crash controller 3.
Then, the engine controller 4 outputs a signal for canceling the throttle control to the electronic throttle 8 to invalidate the accelerator pedal operation.

Next, the content of the forced brake operation determination operation control will be described based on the flowchart of FIG.
First, in step S1, in the pre-crash controller 3, it is determined whether or not a braking object is detected from the relative distance information with respect to the braking object input from the braking object detection sensor 1, and when YES is determined. Advances to step S2.

  In step S2, the pre-crash controller 3 determines whether or not there is a high possibility of a collision with the braking object from the relative distance information and the current vehicle speed input from the vehicle speed sensor 2 (braking object). If it is YES, the process proceeds to step S3, where a brake pressurization command signal is output to the brake controller 4, and the brake controller 4 outputs a pressurization signal to the brake actuator 5 (brake Standby means).

  In the subsequent step S4, it is determined from the brake pedal position signal input from the brake pedal position sensor 9 whether or not a brake operation has been performed by the operator. If YES, the process proceeds to step S7 and the brake controller 4 is instructed. On the other hand, a forced brake operation command signal is output, and the brake controller 4 outputs a forced brake operation command to the brake actuator 5, thereby completing one flow.

When the determination in step S4 is NO (no brake operation by the operator), the process proceeds to step S5, and from the accelerator pedal position signal input from the accelerator pedal position sensor 6, it is determined whether or not the accelerator full stroke acceleration is greater than a certain value. If the determination is YES, the process proceeds to step 7.
In step S7, a forced brake operation command signal is output to the brake controller 4, and the brake controller 4 outputs a forced brake operation command to the brake actuator 5 (forced brake operation determination means) and the engine controller 7 In response to this, the engine controller 4 outputs a signal for canceling the throttle control to the electronic throttle 8 to invalidate the accelerator pedal operation, thereby completing one flow.
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  If the determination in step S5 is NO (accelerator full stroke acceleration is less than a certain value), the process proceeds to step 6. As shown in the time chart of FIG. 3, the accelerator stroke acceleration is calculated by monitoring the amount of movement of the accelerator pedal per unit time from the pedal position signal. Set to the depressed position.

In step S6, it is determined again from the relative distance information and the current vehicle speed input from the vehicle speed sensor 2 whether or not there is a high possibility of a collision with the braking object. To the brake controller 4, the brake controller 4 outputs a forced brake operation command to the brake actuator 5 (forced brake means), and this completes one flow. To do.
If NO, the process returns to step S2.

  When the determinations in steps S1 and S2 are NO, this ends one flow.

  Next, the operation of this embodiment will be described.

[Forced brake control by operator's brake operation]-Flow of steps S1 to S4, S7.
In the pre-crash controller 3, the braking object is detected from the relative distance information with respect to the braking object input from the braking object detection sensor 1 (step S1).
When the braking object is detected, it is determined from the relative distance information and the current vehicle speed input from the vehicle speed sensor 2 that the possibility of a collision with the braking object is high (step S2), and the brake pressurization is performed. Performed (step S3).
After the brake pressurization is performed, if it is determined from the brake pedal position signal input from the brake pedal position sensor 9 that the operator has performed a brake operation (step S4), a forced brake operation is performed (step S7). .

  In this way, when the brake operation is performed by the operator after the brake pressurization is performed, the braking distance can be shortened by performing the forced brake operation prior to the forced brake control operation.

[Normal forced brake control] Flow of steps S1-7.
In the pre-crash controller 3, the braking object is detected from the relative distance information with respect to the braking object input from the braking object detection sensor 1 (step S1).
When the braking object is detected, it is determined from the relative distance information and the current vehicle speed input from the vehicle speed sensor 2 that the possibility of a collision with the braking object is high (step S2), and the brake pressurization is performed. Performed (step S3).
After the brake pressurization is performed, it is determined again from the relative distance information and the current vehicle speed input from the vehicle speed sensor 2 that there is a high possibility of a collision with the braking object (steps S4 to S6). Then, the forced brake operation is performed (step S7).

  As described above, when the brake operation or the accelerator operation is not performed by the operator after the brake pressurization is performed, the forced brake control operation is performed.

[Forced brake control by operator's accelerator operation] Flow of steps S1 to S5, S7.
In the pre-crash controller 3, the braking object is detected from the relative distance information with respect to the braking object input from the braking object detection sensor 1 (step S1).
When the braking object is detected, it is determined from the relative distance information and the current vehicle speed input from the vehicle speed sensor 2 that the possibility of a collision with the braking object is high (step S2), and the brake pressurization is performed. Performed (step S3).
If it is determined from the accelerator pedal position signal input from the accelerator pedal position sensor 6 after the brake pressurization that the accelerator full stroke acceleration is above a certain level (steps S4 and S5), the forced brake operation is performed. (Step S6). Further, a throttle cancel signal is output to the engine controller 7, and the engine controller 4 outputs a signal for canceling the throttle control to the electronic throttle 8 to invalidate the accelerator pedal operation (step S7).

  As described above, when the accelerator pedal operation is performed by the operator after the brake pressurization is performed, the forced braking operation is performed prior to the forced brake control operation, and the braking operation is shortened by invalidating the accelerator operation. be able to.

Next, the effect of this embodiment will be described.
In the brake device of this embodiment, as described above, if the accelerator operation is greater than or equal to the predetermined operation before the braking operation by the forced braking means after the collision determination by the braking object collision inevitable detecting means, the forced braking means By providing a forced brake activation determination means that performs a braking operation, even if the operator steps on the accelerator in a state where there is a high possibility of a collision, the result is a forced braking operation. The start of forced brake control operation can be accelerated.

Therefore, an effect that the braking distance can be shortened can be obtained.
In addition, the system can be realized by improving the degree of providing acceleration sensing for accelerator pedal operation to the current system.
In addition, the acceleration of the accelerator pedal operation can be easily obtained in a vehicle with an electronic throttle, and the vehicle equipped with a pre-crash system is usually an electronic throttle, requiring little physical change. .

  Further, the forced brake operation determining means performs the forced braking operation by the forced brake means with the accelerator full stroke as a predetermined operation, thereby eliminating malfunction and improving the reliability of the system. .

  In addition, the forced brake activation determination means cancels the throttle control when the forced braking operation is performed by the forced brake means, thereby disabling the accelerator operation without changing the pedal. By performing the operation, it is possible to prevent the braking distance from being extended by an erroneous accelerator operation.

  Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.

  For example, in the embodiment, an example in which a mechanical scan type radar device is used as the braking object detection sensor 1 is shown. However, a known means such as an electronic scan method or an image processing device using an image sensor may be used. Can be used.

It is a system block diagram which shows the brake device of an Example. It is a flowchart which shows the forced brake action determination control content of the brake device of an Example. It is a time chart which shows the example of an accelerator operation state in forced brake action | operation determination.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake object detection sensor 2 Vehicle speed sensor 3 Pre-crash controller 4 Brake controller 5 Brake actuator 6 Accelerator pedal position sensor 7 Engine controller 8 Electronic throttle 9 Brake pedal position sensor

Claims (3)

Braking object collision unavoidable detection means for detecting a case where the host vehicle collides with a forward braking object with high possibility;
Brake standby means to prepare for forced braking operation,
After the collision is judged by the braking object collision unavoidable detection means, a forced braking means for forcibly performing a braking operation from the ready state of the brake standby means when the distance between the vehicle and the host vehicle becomes a predetermined distance;
Forced braking operation determining means for performing a forced braking operation by the forced braking means if the accelerator operation is greater than or equal to a predetermined operation after the braking determination by the braking object collision unavoidable detection means and before the braking operation by the forced braking means; ,
A brake device comprising: The brake device of claim 1,
The forced brake operation determining means is configured to perform a forced brake operation by the forced brake means, with an accelerator full stroke as a predetermined action.
Brake device characterized by that. The brake device according to claim 1 or 2,
The forced brake operation determining means outputs a signal for invalidating the accelerator operation on the engine control side when performing a forced brake operation by the forced brake means.
Brake device characterized by that.

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