JP2015176447A - automatic brake system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an occupant to recognize whether a vehicle collides or not without getting out of the vehicle, when an automatic brake is activated.SOLUTION: An automatic brake system determines whether the automatic brake by means of an automatic brake device 10 is activated or not, determines whether a collision occurs on the vehicle or not on the basis of an acceleration signal output from an acceleration sensor installed in the vehicle when it is determined that the automatic brake by means of the automatic brake device 10 is activated, and informs the occupant whether the collision occurs on the vehicle or not according to the determined result.

Description

  The present invention relates to an automatic brake system mounted on a vehicle equipped with an automatic brake device.

  Conventionally, in an in-vehicle camera system that captures an image with the camera facing in any direction in and out of the vehicle according to a user operation, the recording control unit monitors the vehicle signals of steering, brake, and accelerator operation amounts and In some cases, when steering, sudden braking, or sudden acceleration is determined, the camera is forcibly switched to a drive recorder mode in which the periphery of the vehicle is photographed and the image data is stored (see, for example, Patent Document 1).

JP 2012-94972 A

  In recent years, in order to avoid a collision with a vehicle in front of the vehicle or the like, an increasing number of vehicles are equipped with an automatic brake device that applies an automatic brake to reduce the traveling speed of the vehicle or stop the vehicle. In such a vehicle, the automatic brake is not operated until immediately before the collision in order to avoid dependence on the driver's system. For this reason, the vehicle receives a large impact when the automatic brake is activated.

  When the vehicle is colliding with an object ahead when such an automatic brake is activated, it is necessary for the passenger to get off the vehicle and visually check it. However, when the vehicle does not collide with an object ahead, there is a high possibility that a contact accident (secondary accident) will occur when the occupant gets off the vehicle and visually confirms it and comes into contact with the following vehicle. Since it causes traffic jams, it is preferable that the presence or absence of a vehicle collision when the automatic brake is activated can be recognized without the passenger getting off the vehicle.

  Note that, as in the device described in Patent Document 1, when sudden steering, sudden braking, or sudden acceleration is determined, the camera is forcibly switched to a drive recorder mode that captures the periphery of the vehicle and stores the image data. With such a configuration, it is difficult to accurately determine the presence or absence of a vehicle collision when the automatic brake is activated.

  The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to recognize the presence or absence of a vehicle collision without an occupant getting off when the automatic brake is operated.

  In order to achieve the above object, an invention according to claim 1 is an automatic brake system mounted on a vehicle equipped with an automatic brake device (10), wherein whether or not the automatic brake by the automatic brake device is activated is determined. When it is determined by the brake operation determining means and the brake operation determining means that the automatic brake by the automatic brake device has been operated, a collision has occurred in the vehicle based on the acceleration signal output from the acceleration sensor mounted on the vehicle. A collision determination unit that determines whether or not a collision has occurred in the vehicle according to a determination result of the collision determination unit.

  According to such a configuration, it is determined whether or not the automatic brake by the automatic brake device has been operated, and if it is determined that the automatic brake by the automatic brake device has been operated, it is determined whether or not a collision has occurred in the vehicle. Then, according to this determination result, whether or not a collision has occurred in the vehicle is notified to the occupant, so that the presence or absence of the vehicle collision can be recognized without the occupant getting off during the automatic brake operation.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a figure showing the whole automatic brake system composition concerning one embodiment of the present invention. It is a flowchart of the control part of an automatic brake system.

  FIG. 1 shows the overall configuration of an automatic brake system according to an embodiment of the present invention. The automatic brake system is mounted on a vehicle equipped with the automatic brake device 10. The automatic brake system includes an automatic brake device 10, a display unit 11, a speaker 12, and a control unit 13.

  The automatic brake device 10 is a pre-crash safety (PCS) that activates a powerful automatic brake if there is no driver's braking operation even though there is a high possibility of collision with an object in front of the vehicle (for example, a preceding vehicle). It is configured using the system.

  A vehicle speed sensor 20, a laser radar 21, and a front camera 22 are connected to the automatic brake device 10. The vehicle speed sensor 20 outputs a vehicle speed signal corresponding to the vehicle speed of the vehicle to the automatic brake device 10. The laser radar 21 measures the distance to the object ahead of the vehicle and the moving speed of the object, and outputs information indicating the distance to the object and the moving speed of the object to the automatic brake device 10. The front camera 22 captures the front of the vehicle and outputs the captured image to the automatic brake device 10. Although not shown, a brake operation signal corresponding to the operation amount of the brake pedal is input to the automatic brake device 10 and the control unit 13.

  The automatic brake device 10 specifies the distance to the object in front of the vehicle and the moving speed of the object based on information input from the laser radar 21, and forwards the vehicle based on the captured image input from the front camera 22. Are identified, and whether or not a collision with an object in front of the vehicle is possible is determined. Further, when the automatic brake device 10 determines that there is a high possibility of collision with an object in front of the vehicle, the automatic brake device 10 activates a powerful automatic brake.

  The automatic brake device 10 in this embodiment determines the vehicle speed of the vehicle based on the vehicle speed signal input from the vehicle speed sensor 20, and is limited to the case where the vehicle speed is within a predetermined range (for example, 30 km / h or less). The automatic brake is activated.

  Further, when the automatic brake is operated, the automatic brake device 10 outputs an operation signal indicating that the automatic brake is operated to the control unit 13.

  The display unit 11 includes a display provided in the navigation device, a warning lamp that notifies that the automatic brake has been activated, and a warning lamp that notifies that the engine has been forcibly stopped. Each warning light is provided in the meter panel.

  The display unit 11 displays an image corresponding to the image signal input from the control unit 13 on a display provided in the navigation device, and lights each warning lamp according to the signal input from the control unit 13.

  The speaker 12 outputs sound corresponding to the sound signal input from the control unit 13.

  The control part 13 is comprised as a computer provided with CPU, RAM, ROM, I / O, etc., CPU implements various processes according to the program memorize | stored in ROM.

  When the airbag control device 24 determines the level of the collision when there is a vehicle collision and determines that the airbag needs to be deployed, the airbag control device 24 quickly deploys the airbag so that the occupant can move the steering, dashboard, and windshield. It will alleviate the impact of the impact.

  The airbag control device 24 is connected to an acceleration sensor 23 that outputs a collision detection signal (corresponding to an acceleration signal) corresponding to the acceleration. The acceleration sensor 23 is attached in front of the vehicle.

  When the airbag control device 24 determines the level of the collision from the collision detection signal from the acceleration sensor 23 and determines that the airbag needs to be deployed, the airbag control device 24 sends an ignition instruction to the inflator (gas generating device). ing.

  When an ignition instruction is sent from the airbag control device 24 to the inflator, ignition by the inflator is performed, gas is generated by combustion, and the airbag is deployed.

  The control unit 13 in the automatic brake system in the present embodiment determines whether or not the automatic brake device 10 has been operated. If it is determined that the automatic brake device 10 has been operated, whether or not a collision has occurred in the vehicle is determined. If it is determined and it is determined that a collision has occurred in the vehicle, a process of notifying the occupant whether or not a collision has occurred in the vehicle is performed.

  FIG. 2 shows a flowchart of this process. This automatic brake system is in an operating state when the ignition switch of the vehicle is turned on, and the control unit 13 periodically performs the processing shown in FIG.

  First, it is determined whether or not automatic braking by the automatic braking device 10 has been activated (S100). Specifically, it is determined whether or not the automatic brake device 10 is operated based on whether or not an operation signal indicating that the automatic brake is operated is input from the automatic brake device 10.

  Here, when the automatic brake device 10 does not operate the automatic brake, the determination in S100 is NO, and the determination in S100 is repeatedly performed.

  Further, for example, when the vehicle approaches the preceding vehicle ahead and there is a high possibility that the vehicle will collide with the preceding vehicle ahead of the vehicle, there is no driver's braking operation, and the automatic braking by the automatic brake device 10 is activated. An operation signal is input from the brake device 10.

  In order to avoid dependence on the driver's system, the automatic brake is not operated until immediately before the collision. Therefore, a large impact is generated on the vehicle when the automatic brake is operated.

  As described above, when the automatic brake is operated by the automatic brake device 10 and the operation signal is input from the automatic brake device 10, the determination in S100 is YES, and then an obstacle in front of the vehicle (for example, a preceding vehicle). It is determined whether or not there is a collision (S102). Specifically, it is determined whether or not there is a collision with an obstacle ahead of the vehicle based on a collision detection signal from the acceleration sensor 23 connected to the airbag control device 24.

  Here, for example, if the vehicle collides with a preceding vehicle ahead and a collision detection signal is input from the acceleration sensor 23 via the airbag control device 24, the determination in S102 is YES, and then the automatic brake is activated. In addition, the vehicle is notified that a collision has occurred (S104). Specifically, a warning light on the display unit 11 is turned on to notify that the automatic brake is activated, and a warning sound indicating that the automatic brake is activated is emitted from the speaker 12. Further, a message such as “There is a possibility of collision” is displayed on the display of the display unit 11 and is issued from the speaker 12. Furthermore, a captured image of the front camera 22 is acquired via the automatic brake device 10, and the captured image of the front camera 22 is displayed on the display unit 11. If the determination in S102 is YES, the airbag may be deployed or the airbag may not be deployed.

  Next, the hazard lamp 15 is blinked (S106). Specifically, the hazard lamp 15 is blinked by outputting a signal instructing the hazard lamp 15 to blink.

  Next, an occupant is warned of brake depression (S108). The reason for giving such a warning is that if the brake is not applied, the vehicle moves forward due to the creep phenomenon even in the idling state. Specifically, a message such as “please step on the brake because the vehicle may move forward due to a creep phenomenon” is displayed on the display of the display unit 11 and issued from the speaker 12.

  Next, it is determined whether or not a brake operation has been performed within a certain time (S110). Specifically, timing is started using a timer function from the time of warning the driver to step on the brake, and it is determined whether or not a brake operation has been performed within a certain time. Note that the presence or absence of a brake operation can be determined based on a brake signal input from the vehicle.

  Here, if the brake operation is not performed by the driver within a certain time, the determination in S110 is NO, and then the vehicle engine is forcibly stopped (S112). Specifically, a signal for instructing the engine to stop is transmitted to the engine ECU 26 to forcibly stop the engine of the vehicle.

  Next, the passenger is notified that the engine has been forcibly stopped (S114). Specifically, a warning lamp provided on the display unit 11 for notifying that the engine has been forcibly stopped is turned on, and “forcibly stopped the engine. The engine can be started by the starting operation of “.” Is displayed on the display of the display unit 11 and is issued from the speaker 12, and the process is terminated.

  If no collision has occurred in the vehicle based on the collision detection signal input from the acceleration sensor 23 via the airbag control device 24 after the automatic braking by the automatic braking device 10 is activated, the determination in S102 is made. NO, and then, in addition to the operation of the automatic brake, the vehicle is informed that no collision has occurred (S116). Specifically, a warning light on the display unit 11 is turned on to notify that the automatic brake is activated, and a warning sound indicating that the automatic brake is activated is emitted from the speaker 12. Further, a message such as “no collision has occurred” is displayed on the display of the display unit 11 and is issued from the speaker 12. Furthermore, a captured image of the front camera 22 is acquired via the automatic brake device 10, and the captured image of the front camera 22 is displayed on the display unit 11.

  Next, the hazard lamp 15 is blinked (S118). Specifically, the hazard lamp 15 is blinked by outputting a signal instructing the hazard lamp 15 to blink.

  Next, an occupant is warned of brake depression (S120). Specifically, a message such as “please step on the brake as the vehicle may move forward due to a creep phenomenon” is displayed on the display unit 11 and a voice is output from the speaker 12, and the process is terminated. To do. The driver can resume driving without getting off the vehicle and visually checking the vicinity of the vehicle.

  According to the above-described configuration, it is determined whether or not the automatic brake by the automatic brake device 10 has been activated, and when it is determined that the automatic brake by the automatic brake device 10 has been activated, the acceleration signal output from the acceleration sensor 23 is Based on this determination result, it is determined whether or not a collision has occurred in the vehicle, and the occupant is informed of whether or not a collision has occurred in the vehicle. The presence or absence can be recognized.

  In addition, a front camera 22 that captures the front of the vehicle is provided, and when it is determined that automatic braking by the automatic brake device 10 has been activated, a captured image of the front of the vehicle captured by the front camera 22 is displayed on the display unit 11. Therefore, the occupant can recognize the situation in front of the vehicle without getting off the vehicle.

  Further, the acceleration sensor 23 uses an acceleration sensor used in the airbag control device 24 mounted on the vehicle, so that it is not necessary to newly provide an acceleration sensor in the vehicle and the cost can be suppressed.

  In addition, when it is determined that a collision has occurred in the vehicle, the hazard lamp provided on the vehicle blinks, so that it is possible to promptly alert the following vehicle and prevent the following vehicle from colliding with the own vehicle. Is possible.

  Further, when it is determined that a collision has occurred in the vehicle, the vehicle occupant is warned of the depression of the brake pedal, so that the vehicle can be prevented from moving forward due to a creep phenomenon.

  In addition, after issuing a warning about the depression of the brake pedal, it is determined whether the depression of the brake pedal has been performed within a predetermined time, and the depression of the brake pedal is performed within the predetermined time. If it is determined that the vehicle has not been operated, it is instructed to stop the operation of the power source for driving the vehicle, so that the vehicle can be more reliably prevented from moving forward due to the creep phenomenon.

  Further, when the operation stop of the power source for driving the vehicle is instructed, the passenger is informed that the operation of the power source for driving the vehicle has been stopped, so that the passenger operates the power source for driving the vehicle. It is possible to easily recognize the factor that stopped the operation.

  The present invention is not limited to the above-described embodiment, and various modifications can be made as follows without departing from the spirit of the present invention.

  For example, in the above embodiment, after the automatic brake is activated, when the automatic brake is notified in S104 and S116, the captured image of the front camera 22 is displayed on the display of the display unit 11. The captured image is not limited to the image captured by the front camera 22, and for example, a captured image of the rear of the vehicle captured by the rear camera that captures the rear of the vehicle may be displayed. Moreover, you may make it display both the picked-up image of the front camera 22, and the picked-up image of a rear camera.

  Moreover, in the said embodiment, although it determined whether the collision generate | occur | produced in the vehicle based on the collision detection signal output from the acceleration sensor used for the airbag control apparatus mounted in the vehicle, It is not limited to the collision detection signal output from the acceleration sensor used, but whether or not a collision has occurred in the vehicle based on a signal output from a dedicated acceleration sensor provided to detect a vehicle collision May be determined.

  In the above embodiment, it is determined whether or not a collision has occurred in the vehicle based on the collision detection signal output from the acceleration sensor used in the airbag control device mounted on the vehicle. A distance measuring sensor (for example, an ultrasonic sensor) for measuring a distance from an object (for example, a preceding vehicle) is provided, and a collision detection signal output from an acceleration sensor mounted on the vehicle and a vehicle measured by the distance measuring sensor are measured. You may make it determine whether the collision generate | occur | produced in the vehicle based on the distance with the front obstacle. By adopting such a configuration, it is possible to determine whether or not a collision has occurred in the vehicle with higher accuracy.

  Moreover, in the said embodiment, although it determined whether the collision generate | occur | produced in the vehicle based on the collision detection signal output from the acceleration sensor used for the airbag control apparatus mounted in the vehicle, it was mounted in the vehicle. The distance between the vehicle and the surrounding vehicle is estimated based on the size of the number plate of the preceding vehicle included in the image photographed by the front camera 22, and the collision detection signal output from the acceleration sensor mounted on the vehicle and the preceding vehicle are estimated. You may make it determine whether the collision generate | occur | produced in the vehicle based on the inter-vehicle distance with the preceding vehicle estimated based on the magnitude | size of the number plate of a vehicle. By adopting such a configuration, it is possible to determine whether or not a collision has occurred in the vehicle with higher accuracy.

  Moreover, in the said embodiment, although it determined whether the collision generate | occur | produced in the vehicle based on the collision detection signal output from the acceleration sensor used for the airbag control apparatus mounted in the vehicle, it is mounted in the vehicle. The sound collected around the vehicle is collected using the microphone, and the sound collected by the microphone is used to determine whether or not the vehicle has a collision. it can.

  In the above embodiment, the engine is stopped as a power source for traveling the vehicle in S112. However, for example, in the case of an electric vehicle using a motor as a power source for traveling the vehicle, S112 is used. The motor as a power source for driving the vehicle may be stopped.

  In the above embodiment, in addition to the automatic brake being activated in S116, the vehicle is informed that no collision has occurred, and after performing the processing of S118 and S120, the processing shown in FIG. 2 is performed. For example, after the process of S120 is performed, the processes of S110 to S114 may be performed. In addition, in S116, in addition to the operation of the automatic brake, it may be notified that no collision has occurred in the vehicle, and then the processing shown in FIG.

  The correspondence relationship between the configuration in the above embodiment and the configuration of the claims will be described. S100 corresponds to the brake operation determination unit, S102 corresponds to the collision determination unit, and S104 and S116 correspond to the collision notification unit. S106 corresponds to the hazard lamp blinking means, S108 corresponds to the warning means, S110 corresponds to the brake pedal depression determination means, S112 corresponds to the operation stop means, and S114 corresponds to the operation stop notification means. .

DESCRIPTION OF SYMBOLS 10 Automatic brake device 11 Display part 12 Speaker 13 Control part 20 Vehicle speed sensor 21 Laser radar
22 Front Camera 23 Acceleration Sensor 24 Airbag Control Device 25 Hazard Lamp 26 Engine Control Device

Claims (7)

An automatic brake system mounted on a vehicle equipped with an automatic brake device (10),
Brake operation determination means for determining whether or not the automatic brake by the automatic brake device has been activated,
If it is determined by the brake operation determination means that the automatic brake by the automatic brake device has been operated, whether or not a collision has occurred in the vehicle based on an acceleration signal output from an acceleration sensor mounted on the vehicle. Collision determination means for determining;
An automatic brake system comprising: a collision notification unit that notifies a passenger whether or not a collision has occurred in the vehicle according to a determination result of the collision determination unit. A camera (22) for photographing the surroundings of the vehicle;
2. The automatic brake system according to claim 1, wherein the collision notification unit causes the display unit (11) to display a photographed image around the vehicle photographed by the camera.   The automatic brake system according to claim 1 or 2, wherein the acceleration sensor is an acceleration sensor (23) used in an airbag control device (24) mounted on the vehicle.   4. A hazard lamp blinking means for blinking a hazard lamp provided in the vehicle when the collision determination means determines that a collision has occurred in the vehicle. The automatic brake system described in 1.   5. The apparatus according to claim 1, further comprising a warning unit that warns an occupant of the vehicle that the brake pedal is depressed when the collision determination unit determines that a collision has occurred in the vehicle. The automatic brake system described in 1. Brake pedal depression determination means for determining whether or not the brake pedal has been depressed within a predetermined time after warning of depression of the brake pedal by the warning means;
An operation stop means for instructing to stop the operation of the power source for driving the vehicle when it is determined by the brake pedal depression determination means that the brake pedal is not depressed within the predetermined time. The automatic brake system according to claim 5, further comprising:   An operation stop notifying means for notifying an occupant that the operation of the power source for driving the vehicle has been stopped when the operation stop means instructs to stop the power source for driving the vehicle; The automatic brake system according to claim 6.

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