JP2017074822A - Brake control device for vehicle - Google Patents

Abstract

An object of the present invention is to automatically apply an appropriate braking force to a wheel to stop a vehicle when a vehicle equipped with a front / rear braking force distribution control device (so-called EBD) collides.
In a vehicle brake control device 100, the vehicle brake control device 100 includes an automatic brake control device 12a that automatically applies a braking force to a wheel 22 and a front / rear braking force distribution control device 12b that adjusts a front / rear braking force distribution. When the detection sensor 2 detects the collision of the vehicle Ve, the braking force for prohibiting the EBD control for distributing the front / rear braking force by the front / rear braking force distribution control device 12b and executing the automatic brake control by the automatic brake control device 12a A control unit 12 is provided.
[Selection] Figure 1

Description

  The present invention relates to a vehicle brake control device.

  Patent Document 1 discloses a braking control device that automatically activates a brake when it is determined that a collision has occurred in order to reduce secondary damage at the time of a vehicle collision.

JP2013-082298A

  By the way, as a device for controlling the braking force of the vehicle, there is known a front / rear braking force distribution control device for adjusting the braking force distribution of the front and rear wheels, so-called electronically controlled braking force distribution device (EBD), in order to ensure the stability of the vehicle. It has been.

  However, the braking control device disclosed in Patent Document 1 does not consider the front / rear braking force distribution control device at the time of a vehicle collision. For example, if the front / rear braking force distribution control (EBD control) by the front / rear braking force distribution control device intervenes during execution of the automatic brake control, the braking force of the rear wheels is limited. Therefore, even if the automatic brake control is executed when a collision occurs, the braking force of the rear wheels may not be sufficiently used due to the intervention of the EBD control.

  The present invention has been made in view of the above circumstances, and can be used for a vehicle that can automatically apply an appropriate braking force to a wheel to stop the vehicle when a vehicle equipped with a front / rear braking force distribution control device collides. An object is to provide a braking control device.

  The present invention provides a vehicle brake control including an automatic brake control device that automatically applies a braking force to a wheel when a predetermined condition is satisfied, and a front / rear braking force distribution control device that adjusts a front / rear braking force distribution of the vehicle. In the apparatus, when the collision detection means detects the occurrence of a vehicle collision, the control for distributing the braking force before and after the vehicle by the front and rear braking force distribution control device is prohibited, and the automatic brake control device automatically controls the collision. Control means for executing control for applying power to the wheels is provided.

  In the present invention, when the occurrence of a collision of the host vehicle is detected, the control for distributing the front / rear braking force by the front / rear braking force distribution control device is prohibited, so that the braking force on the rear wheel side can be effectively utilized. Thus, by executing the automatic brake control by the automatic brake control device, an appropriate braking force for stopping the vehicle can be automatically applied to the wheels.

FIG. 1 is a schematic diagram showing a system configuration of a vehicle braking control apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart showing an example of a braking force control flow executed by the vehicle braking control device.

  Hereinafter, a vehicle brake control device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram showing a system configuration of a vehicle braking control apparatus according to an embodiment of the present invention. A vehicle brake control device 100 according to the present embodiment is a vehicle control system mounted on a vehicle Ve, and includes a control unit 1, a collision detection sensor 2, an airbag driving device 3, a vehicle speed sensor 4, and an acceleration sensor. 5 and a brake control device 6.

  The control unit 1 is an electronic control unit (ECU) that comprehensively controls the vehicle control system. The control unit 1 includes a storage unit in which various control programs are stored. The control unit 1 executes various control programs according to sensor signals input from the various sensors 2, 4, and 5, and outputs various kinds of command signals. It is configured to perform control. The control unit 1 includes an airbag control unit 11 and a braking force control unit 12. Details of the control units 11 and 12 will be described later.

  The collision detection sensor 2 detects a collision of the vehicle Ve. The collision detection sensor 2 includes, for example, a front collision detection sensor 2a attached to the front portion (front surface) of the vehicle Ve, a right side collision detection sensor 2b attached to the right side portion (right side surface) of the vehicle Ve, and the vehicle Ve. A left side collision detection sensor 2c attached to the left side (left side) of the vehicle and a rear collision detection sensor 2d attached to the rear part (rear side) of the vehicle Ve. Each of the collision detection sensors 2a to 2d outputs a collision detection signal to the airbag control unit 11 when a collision of the vehicle Ve is detected. The collision detection sensor 2 is a collision detection sensor having a known configuration.

  The airbag driving device 3 controls a plurality of airbag deployment mechanisms (not shown). The airbag deployment mechanism is provided at a plurality of locations (front side, side surface, rear side) in the vehicle interior. Therefore, an airbag driving device 3 may be provided for each airbag deployment mechanism. For example, the airbag driving device 3 includes one for front collision, one for side collision, and one for rear collision.

  The vehicle speed sensor 4 detects the vehicle speed of the vehicle and outputs a vehicle speed signal (vehicle speed sensor value) to the control unit 1 (braking force control unit 12). The acceleration sensor 5 detects the acceleration of the vehicle and outputs an acceleration signal (acceleration sensor value) to the control unit 1 (braking force control unit 12). The acceleration sensor 5 includes a longitudinal acceleration sensor and a lateral acceleration sensor.

  The brake control device 6 controls the brake mechanism 21 that generates the braking force of the vehicle Ve. When the command signal (brake control signal) output from the control unit 1 is input, the brake control device 6 controls the braking force generated by the brake mechanism 21 according to the brake control signal. The brake mechanism 21 is a known braking device such as a hydraulic type, and applies a braking force to the wheels 22.

  In addition, the brake control device 6 automatically applies a braking force to the wheels 22 according to the control of the control unit 1 when a predetermined condition is satisfied even if the driver does not operate the brake pedal (brake operation). Execute control.

  The airbag control unit 11 is configured to control the airbag driving device 3 in accordance with a collision detection signal input from the collision detection sensor 2. When the collision detection signal is input from the collision detection sensor 2, the airbag control unit 11 outputs an airbag control signal for deploying the airbag to the airbag driving device 3. When the airbag control signal is input from the airbag control unit 11, the airbag driving device 3 executes control for causing the airbag deployment mechanism to deploy the airbag.

  The braking force control unit 12 includes an automatic brake control device 12a that controls the brake control device 6 so as to automatically apply a brake, and a front / rear braking force distribution control device (EBD) 12b that adjusts the braking force distribution before and after the vehicle Ve. Control means including The braking force control unit 12 outputs a command signal (brake control signal) to the brake control device 6 when executing various types of braking control. The front / rear braking force distribution control device 12b executes front / rear braking force distribution control (hereinafter referred to as "EBD control") for adjusting the braking force distribution of the front and rear wheels 22 in order to ensure the stability of the vehicle Ve. The braking force control unit 12 may include a control device that functions as an antilock brake system (ABS).

  Further, the automatic brake control device 12a outputs a brake control signal for applying an automatic brake to the brake control device 6 when a predetermined condition is satisfied even if the driver does not operate the brake pedal (brake operation). The predetermined condition includes the case where the collision detection sensor 2 detects the collision of the vehicle Ve. In short, the braking force control unit 12 is configured to detect the occurrence of a collision of the vehicle Ve. When the collision of the vehicle Ve occurs, the braking force control unit 12 and the brake control device 6 are used to stop the vehicle Ve. The automatic brake control is configured to be executed.

  Specifically, in the control unit 1, when a collision detection signal is input from the collision detection sensor 2 to the airbag control unit 11, a signal indicating that the airbag control unit 11 has detected a collision with the braking force control unit 12 ( Air bag control signal). That is, the braking force control unit 12 includes a determination unit that determines whether or not a collision of the vehicle Ve has been detected. Thereby, when the braking force control unit 12 recognizes the collision of the vehicle Ve, after detecting the occurrence of the collision, the braking force control unit 12 executes automatic brake control for automatically operating the brake mechanism 21 in order to stop the vehicle Ve. . The control unit 1 may be configured such that a collision detection signal from the collision detection sensor 2 is input to the braking force control unit 12. In short, the braking force control unit 12 may be configured to recognize (determine) the occurrence of a collision of the vehicle Ve based on the collision detection signal or the airbag control signal.

  FIG. 2 is a flowchart illustrating an example of a braking force control flow executed by the vehicle braking control apparatus 100 according to the present embodiment. The vehicle braking control device 100 is configured to repeatedly execute the control routine shown in FIG.

  The control unit 1 determines whether or not the vehicle Ve is performing automatic braking after the collision (step S1). In the process of step S1, it is determined whether or not the braking force control unit 12 is executing automatic brake control by detecting the occurrence of a collision of the vehicle Ve.

  When a positive determination is made in step S1 because the vehicle Ve is performing automatic braking after the collision, the braking force control unit 12 determines whether or not an automatic brake control termination condition is satisfied (step S1). S2). The termination condition includes a case where the vehicle speed is zero. The braking force control unit 12 can determine whether or not the vehicle speed = 0 based on the vehicle speed signal input from the vehicle speed sensor 4. In the determination process in step S2, when the vehicle speed = 0, it is determined that the end condition is satisfied. If the vehicle Ve is decelerating and the negative condition is determined in step S2 because the automatic brake control end condition is not satisfied, the control unit 1 ends this control routine.

  If an affirmative determination is made in step S2 when the automatic brake control end condition is satisfied, the braking force control unit 12 determines that the vehicle Ve after the collision has stopped, and ends the automatic brake control (step S3). ). The control unit 1 terminates this control routine after terminating automatic braking.

  In Step S1, when it is determined negative because the vehicle Ve does not perform automatic braking after the collision, the braking force control unit 12 determines whether or not the collision of the vehicle Ve is detected. (Step S4). In the determination process of step S4, it is determined whether a collision detection signal or an airbag control signal is input to the braking force control unit 12. Further, the braking force control unit 12 determines whether or not the magnitude (absolute value) of the acceleration indicated by the acceleration signal is larger than a predetermined threshold based on the acceleration signal input from the acceleration sensor 5. It is configured to be able to. If the vehicle Ve collides, a large change in acceleration occurs. Therefore, in the determination process in step S4, when the absolute value of the acceleration sensor value is larger than the threshold value, it can be determined that the collision of the vehicle Ve has been detected. The acceleration sensor value may be a sensor value indicating the longitudinal acceleration input from the longitudinal acceleration sensor, or may be a sensor value indicating the lateral acceleration input from the lateral acceleration sensor. And when it determines negative by step S4 by not detecting the collision generation | occurrence | production of the vehicle Ve, the control unit 1 complete | finishes this control routine.

  If a positive determination is made in step S4 by detecting the occurrence of a collision of the vehicle Ve, the braking force control unit 12 automatically applies a braking force for stopping the vehicle Ve after the collision to the wheels 22, And control which prohibits EBD control is performed (step S5). That is, in the control process of step S5, when a collision occurs, the automatic brake control by the automatic brake control device 12a is started, and the EBD control by the front / rear braking force distribution control device (EBD) 12b is prohibited. Then, the control unit 1 ends this control routine.

  As described above, according to the vehicle braking control device 100 of the present embodiment, when a collision is detected in the vehicle Ve equipped with the front / rear braking force distribution control device 12b, the EBD control by the front / rear braking force distribution control device 12b is performed. Is prohibited, so that the braking force on the rear wheel side can be effectively utilized. Thus, by executing the automatic brake control by the automatic brake control device 12a, an appropriate braking force for stopping the vehicle Ve can be automatically applied to the wheels 22. That is, in consideration of EBD control, it is prohibited to intervene in EBD control during execution of automatic brake control after a vehicle collision. Therefore, it is possible to prevent the braking force of the rear wheel from being limited by the EBD control intervention after the collision, and it becomes possible to appropriately use the braking force of the rear wheel by the automatic brake control when the collision occurs.

  In the above-described embodiment, the EBD control is not always executed (prohibited) during automatic braking after collision detection, but the present invention is not limited to this.

  For example, as a modification, the control process in step S5 of the control flow shown in FIG. 2 described above may be configured not to prohibit EBD control when there is a brake operation by the driver.

  In addition, there is known a braking control device configured to cause the vehicle Ve to generate a braking force having a larger required braking force when an automatic braking operation and a braking operation by a driver are performed simultaneously. Therefore, the above-described vehicle brake control device 100 may be configured to execute control at the time of automatic braking after a collision on the premise thereof.

  Specifically, the EBD control is not executed (prohibited) only when there is no brake operation by the driver. As a result, when the brake pedal is not depressed because the driver is not conscious or the like, the braking force can be generated to the maximum by the automatic brake control. Alternatively, the EBD control may not be executed (prohibited) only when there is no brake operation by the driver and there is no steering operation by the driver. Further, the EBD control may not be executed (prohibited) only when the driver does not perform the steering operation. In this case, when the steering operation is performed, it is considered that the driver intends to change the direction of the vehicle Ve from the direction in which the vehicle is currently traveling. Therefore, the stability of the vehicle Ve is ensured by executing the EBD control. To do.

  Furthermore, during normal braking (driver braking not after a collision, automatic braking during adaptive cruise control (ACC), etc.), it is usually necessary to consider operating noise and maintain EBD control, increase pressure, and reduce pressure. There are restrictions. On the premise of this, the above-described vehicle braking control device 100 is configured not to restrict the EBD control holding, pressure increasing, and pressure reducing operations during braking after the collision (both automatic braking and braking by the driver). May be. The operation sound is an operation sound generated by driving the hydraulic control valve in association with holding, increasing or reducing the brake hydraulic pressure. The above-described restrictions include not operating within a certain time, not increasing pressure, and not operating according to the left and right slip ratios (operating with hydraulic pressure corresponding to the wheels 22 having a large slip ratio). All of these limitations are aimed at reducing the frequency of operation of the hydraulic control valve described above, and reducing the frequency of generation of operating sounds that can be heard by passengers of the vehicle Ve.

DESCRIPTION OF SYMBOLS 1 Control unit 2 Collision detection sensor 2a Front collision detection sensor 2b Right side collision detection sensor 2c Left side collision detection sensor 2d Rear collision detection sensor 3 Airbag drive device 6 Brake control device 11 Airbag control unit 12 Braking force control unit 12a Automatic Brake control device 12b Front / rear braking force distribution control device (EBD)
100 Brake control device for vehicle

Claims (1)

In a vehicle brake control device comprising: an automatic brake control device that automatically applies braking force to wheels by satisfying a predetermined condition; and a front-rear braking force distribution control device that adjusts front-rear braking force distribution of the vehicle;
When the collision detection means detects the occurrence of a vehicle collision, the control for distributing the front / rear braking force of the vehicle by the front / rear braking force distribution control device is prohibited, and the braking force is automatically generated by the automatic brake control device. A vehicular braking control device comprising control means for executing control applied to the vehicle.

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