JP2014085831A - Dangerous driving determination method, and vehicle-mounted apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dangerous driving determination method for enhancing the accuracy of determination of dangerous driving of a vehicle making a turn with reference to thresholds each suitable for a right turn or a left turn.SOLUTION: A drive recorder 1 determines, when G values are being outputted from a lateral G sensor 22b, whether or not the G value for right turns is not smaller than a threshold for right turns (S2). If it is not smaller than the threshold for right turns, the drive recorder 1 issues an alarm for right turns from a loudspeaker 24 (S3). If the G value for right turns is smaller than the threshold for right turns, the drive recorder 1 determines whether or not the G value for left turns is not smaller than a threshold for left turns (S4). If it is not smaller than the threshold for left turns, the drive recorder 1 issues an alarm for left turns from the loudspeaker 24 (S5). If the G value for left turns is smaller than the threshold for left turns, the drive recorder 1 ends this operation without taking any further action.

Description

  The present invention relates to a dangerous driving determination method and an in-vehicle device that determine dangerous driving of a vehicle.

  Conventionally, a drive recorder that is an in-vehicle device has issued a warning as dangerous driving when the G value applied to the vehicle is greater than or equal to a threshold when the vehicle turns (turns right or left).

  As this type of prior art, Patent Document 1 discloses predicting whether or not the preceding vehicle changes the lane to the own vehicle traveling lane based on information such as acceleration.

  Japanese Patent Laid-Open No. 2004-228688 detects sudden braking based on whether or not the vehicle acceleration exceeds a predetermined threshold. For example, when the vehicle acceleration is smaller than −0.5 [G], sudden braking is detected. It is shown that a brake is detected and detected.

  Patent Document 3 discloses that driving assistance is performed based on information such as acceleration.

JP 2008-257350 A JP 2010-223681 A JP 2011-221758 A

  However, the conventional dangerous driving determination method has the following problems. That is, in the conventional method for determining dangerous driving, when the behavior of the vehicle is different between when turning right and when turning left, it is compared with the G value (acceleration) applied in the lateral direction of the vehicle and exceeds A threshold value for determining dangerous driving was set in common.

  As a result, the determination accuracy of the dangerous driving is lowered, and there are cases where it is not determined that the vehicle is dangerous although it is a dangerous driving. In particular, if the driver learns the driving operation without being determined as dangerous driving when making a sudden turn, a serious accident may occur.

  On the other hand, if the threshold value is set too low, even if the vehicle does not hit the dangerous driving, the driving operation performed by the driver is restricted by determining that the driving is dangerous.

  For this reason, when making a left turn or a right turn, it was desired to set a threshold value appropriately. In addition, in any of Patent Documents 1, 2, and 3, it is not shown that a threshold is set for each left turn and right turn.

  The present invention has been made in view of the above-described circumstances, and an object thereof is a dangerous driving determination method capable of improving the determination accuracy of a dangerous driving of a vehicle during a turn by using a threshold suitable for each right turn and left turn. And providing an in-vehicle device.

In order to achieve the above-described object, the dangerous driving determination method according to the present invention is characterized by the following (1) to (5).
(1) An in-vehicle device is a dangerous driving determination method for determining dangerous driving of a vehicle,
A first threshold value applied when the vehicle turns to the right and a second threshold value applied when the vehicle turns to the left and different from the first threshold value are set in the in-vehicle device,
Detected by the acceleration detection unit when the vehicle turns right, detected by the acceleration detection unit when the acceleration value generated in the vehicle is equal to or greater than the first threshold, or when the vehicle turns left, When the value of acceleration generated in the vehicle is equal to or greater than the second threshold, the in-vehicle device determines that the vehicle is in a dangerous driving state.
about.
(2) A dangerous driving determination method having the configuration of (1) above,
The second threshold value is smaller than the first threshold value.
(3) A dangerous driving determination method having the above configuration (1) or (2),
When the turn signal indicating the direction of travel of the vehicle is instructing a right turn, it is determined whether or not the acceleration value is equal to or greater than the first threshold value.
When the turn signal indicates a left turn, it is determined whether or not the acceleration value is equal to or greater than the second threshold value.
(4) A dangerous driving determination method according to any one of (1) to (3) above,
The higher the vehicle speed, the smaller the first threshold and the second threshold,
Detecting the speed of the vehicle, and comparing the acceleration value with the first threshold value or the second threshold value corresponding to the detected vehicle speed.
(5) The dangerous driving determination method according to any one of (1) to (4) above,
When the acceleration value is greater than or equal to the first threshold value, it is determined that the vehicle is dangerously driven and a right turn warning is issued. When the acceleration value is greater than or equal to the second threshold value, it is determined that the vehicle is dangerously driven and the vehicle turns left. Alarm for.

According to the dangerous driving determination method having the above configuration (1), it is possible to improve the determination accuracy of the dangerous driving of the vehicle during a turn by using a threshold value suitable for each right turn and left turn.
According to the dangerous driving determination method of the above configuration (2), in particular, the left turn threshold value is set lower than the right turn threshold value, so that the driver is directed to turn at a reduced speed when making a left turn. Can contribute to the management of safe driving.
According to the dangerous driving determination method of the above configuration (3), a right turn threshold value and a left turn threshold value that are compared with the vehicle acceleration value detected by the acceleration detection unit in conjunction with the turn signal instruction. Can be easily identified, and even when the output signals from the acceleration sensor have the same sign on the left and right, they can be compared easily.
According to the dangerous driving determination method of the above configuration (4) or (5), the first threshold value and the second threshold value are set to smaller values as the vehicle speed increases. Even if a moderately small acceleration occurs, it can be determined that the vehicle is in a dangerous driving state, and can be appropriately determined at each time of turning right and left.

In order to achieve the above-described object, the vehicle-mounted device according to the present invention is characterized by the following (6).
(6) an acceleration detector that detects lateral acceleration generated in the vehicle;
A first threshold that is applied when the vehicle makes a right turn, and a registration unit that is applied when the vehicle makes a left turn and has a second threshold different from the first threshold; and
The acceleration value detected by the acceleration detector when the vehicle turns right is greater than or equal to the first threshold, or when the vehicle turns left, the acceleration value detected by the acceleration detector is A determination unit that determines a dangerous driving when the second threshold value or more;
Be provided.

  According to the in-vehicle device having the configuration (6), the determination accuracy of the dangerous driving of the vehicle at the time of turning can be improved by a threshold value suitable for each right turn and left turn.

  According to the present invention, it is possible to improve the determination accuracy of the dangerous driving of the vehicle at the time of turning with a threshold suitable for each right turn and left turn. In particular, by setting the left turn threshold lower than the right turn threshold, it is possible to direct the driver to turn at a reduced speed when making a left turn, which can contribute to the management of safe driving.

  Also, by interlocking with the turn signal instruction, it is possible to easily specify the right turn threshold and the left turn threshold to be compared with the vehicle acceleration value detected by the acceleration detection unit. Even when the output signal has the same sign on the left and right, these comparisons are facilitated.

  In addition, as the vehicle speed increases, the first threshold value and the second threshold value are set to smaller values. Therefore, even if a relatively small acceleration occurs when turning at a high speed, it can be determined that the vehicle is in dangerous driving. Moreover, it is possible to determine appropriately at each time of turning right and turning left.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a block diagram illustrating a configuration of a drive recorder 1 to which the dangerous driving determination method according to the first embodiment is applied. FIG. 2A and FIG. 2B are diagrams illustrating threshold values set at the time of right turn and left turn. FIG. 3 is a flowchart showing an operation procedure of the drive recorder 1. FIG. 4 is a flowchart showing an operation procedure of the drive recorder 1 in the second embodiment. FIG. 5 is a flowchart showing an operation procedure of the drive recorder 1 in the third embodiment. FIG. 6 is a diagram illustrating a threshold value table 60 in which threshold values for turning corresponding to the vehicle speed are set.

  A dangerous driving determination method and an in-vehicle device according to an embodiment of the present invention will be described with reference to the drawings. The dangerous driving determination method of the present embodiment is applied to a drive recorder that is an in-vehicle device.

(First embodiment)
FIG. 1 is a block diagram showing a configuration of a drive recorder 1 to which the dangerous driving determination method according to the first embodiment is applied. The drive recorder 1 includes a CPU 10, memory cards 14 and 15, a RAM 16, and various interfaces (I / F) 11, 12, 13, 17, and 18.

  The CPU 10 controls the entire drive recorder 1 and includes a ROM 10a in which a control program is stored, a data memory 10b (registration unit) capable of recording data relating to setting of a recording trigger, which will be described later, and the like.

  The memory cards 14 and 15 are detachably provided in the housing of the drive recorder 1 and record various data. In addition, the memory cards 14 and 15 record image data captured when a recording trigger occurs. The memory card 15 is assigned a memory area 15a in which data relating to the setting of the recording trigger can be written.

  The RAM 16 is used as a work memory. Here, an SD (Synchronous Dynamic) RAM is used as the RAM 16.

  The interface (I / F) 11 is connected to a camera 21 that is installed on the upper part of the windshield of the vehicle and captures images in front and left and right directions of the vehicle. The I / F 12 is connected with a G sensor 22 that detects the acceleration of the vehicle and senses an impact applied to the vehicle. The G sensor (acceleration sensor) 22 includes a longitudinal G sensor 22a that detects acceleration in the longitudinal direction of the vehicle and a lateral G sensor 22b that detects acceleration in the lateral direction of the vehicle.

  The front / rear G sensor 22a outputs the acceleration in the forward direction of the vehicle as a positive signal and outputs the acceleration in the backward direction as a negative signal. Further, the lateral G sensor 22b outputs the acceleration in the left direction of the vehicle as a positive signal and outputs the acceleration in the right direction as a negative signal.

  The type of acceleration sensor is not particularly limited, and may be an optical or mechanical type in addition to a semiconductor type such as a piezoresistive element type or a capacitance type.

  A speed sensor 23 that detects the speed of the vehicle is connected to the speed I / F 13. A speaker 24 that emits a sound such as an alarm is connected to the I / F 17. A switch 25 of a winker (direction indicator) operated by a driver is connected to the I / F 18.

  FIG. 2A and FIG. 2B are diagrams illustrating threshold values set at the time of right turn and left turn. FIG. 2A is a graph showing the output signal of the lateral G sensor and the threshold value set for this output signal when turning left or right.

  Usually, the time during which acceleration is generated in the vehicle at the time of a left turn is shorter than that at the time of a right turn. Therefore, the waveform of the output signal of the lateral G sensor 22b is a waveform having a narrow time width when making a left turn. On the other hand, when turning right, the waveform of the output signal of the lateral G sensor 22b is a waveform having a wide time width. Therefore, when the acceleration signal output from the lateral G sensor is a signal having only a magnitude, it is possible to determine whether the signal is an acceleration signal at the time of right turn or left turn from the signal waveform.

In the present embodiment, the threshold value for determining the occurrence of the recording trigger that is set (applied) for the G value at the time of the left turn is smaller than the threshold value that is set for the G value at the time of the right turn. It is a value. For example, the threshold value at the time of right turn is set to 1.8 G, while the threshold value at the time of left turn is set to 1.8 G (1 G = 9.8 m / s ² ).

  FIG. 2B is a diagram showing a recording trigger setting screen 40. This recording trigger setting screen 40 is displayed when a value related to a recording trigger for the drive recorder 1 is set in a data processing apparatus (not shown) on the office side. Note that a handy device capable of inputting data may be connected to the I / O interface of the drive recorder 1, and the above screen may be displayed to directly set a value related to the recording trigger.

  The setting of the value related to the recording trigger is performed by dividing into four items of forward direction (acceleration), backward direction (deceleration), left direction (left turn), and right direction (right turn). In each item, a “trigger recording” check box 41, an acceleration sensor value (threshold) input box 42, a “trigger image recording” check box 43, and an “external output” check box 44 are provided. Various values can be set.

  The value related to the recording trigger set on the recording trigger setting screen 40 is written in the memory area 15 a of the memory card 15. When the memory card 15 is connected to the drive recorder 1, data related to the recording trigger is transferred and stored from the memory area 15a of the memory card 15 to the data memory 10b built in the CPU 10.

  The operation of the drive recorder 1 having the above configuration will be described. FIG. 3 is a flowchart showing an operation procedure of the drive recorder 1. This control program is stored in the ROM 10a and executed by the CPU 10.

  The drive recorder 1 determines whether or not a G value is output from the lateral G sensor 22b (step S1). When the G value is not output from the lateral G sensor 22b, the drive recorder 1 ends this operation.

  On the other hand, when the G value is output from the lateral G sensor 22b, the drive recorder 1 determines whether or not the right turn G value is equal to or greater than the right turn threshold (step S2). If it is equal to or greater than the right turn threshold, the drive recorder 1 issues a right turn warning from the speaker 24 (step S3). As an alarm for turning right, you may sound an alarm sound when turning right, or sound the message “It is a sudden right turn. If there is a right alarm lamp, it may be turned on.

  Further, in the process of step S3, the drive recorder 1 captures images in the front and left and right directions of the vehicle with the camera 21, and stores the captured image data in the memory card 14 together with data such as the speed detected by the speed sensor 23. Record. Thereafter, the drive recorder 1 ends this operation.

  On the other hand, if the right turn G value is less than the right turn threshold value in step S2, the drive recorder 1 determines whether the left turn G value is greater than or equal to the left turn threshold value (step S4).

  If it is equal to or greater than the left turn threshold, the drive recorder 1 issues a left turn warning from the speaker 24 (step S5). As an alarm for turning left, an alarm sound may be generated at the time of turning left, or a message such as “A sudden left turn. If there is a warning lamp on the left side, it may be turned on.

  In the process of step S5, as in the case of turning right, the drive recorder 1 captures images in the front and left and right directions of the vehicle with the camera 21, and uses the captured image data for the speed detected by the speed sensor 23, etc. Are recorded on the memory card 14. Thereafter, the drive recorder 1 ends this operation. In addition, it is equivalent to the determination part that CPU10 performs the process of step S3, S5.

  On the other hand, if the left turn G value is less than the left turn threshold value in step S4, the drive recorder 1 ends this operation as it is. In addition, when the G value at the time of turning is less than the threshold value for right turn and the threshold value for left turn, it may be notified by a display or the like that the right turn or left turn has been properly performed before the end of this operation. , Leading to the promotion of safe driving.

  According to the drive recorder of the first embodiment, it is possible to improve the determination accuracy of the dangerous driving of the vehicle at the time of turning by using a threshold value suitable for each right turn and left turn. In particular, by setting the left turn threshold lower than the right turn threshold, it is possible to direct the driver to turn at a reduced speed when making a left turn, which can contribute to the management of safe driving.

  In addition, by explicitly separating the alarm for right turn and the alarm for left turn, the driver can be strongly impressed as to which warning was issued when turning left or right, and safe driving can be encouraged. .

(Second Embodiment)
In the second embodiment, a case is shown in which a turning threshold is set in conjunction with a turn signal instruction that indicates the traveling direction of the vehicle. Since the configuration of the drive recorder of the second embodiment is the same as that of the first embodiment, the description thereof is omitted by using the same reference numerals.

  FIG. 4 is a flowchart showing an operation procedure of the drive recorder 1 in the second embodiment. This control program is stored in the ROM 10a and executed by the CPU 10. About the same step process as the said 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the same step number.

  When the G value is output from the lateral G sensor 22b in step S1, the drive recorder 1 determines whether or not the winker SW 25 is on (step S1A). When the blinker SW 25 is off, the drive recorder 1 ends this operation as it is.

  On the other hand, when the blinker SW25 is on, the drive recorder 1 determines whether the turning direction is the right direction or the left direction (step S1B). In the case of the right direction, the drive recorder 1 determines whether or not the right turn G value is greater than or equal to the right turn threshold value in step S2. If the value is equal to or greater than the right turn threshold, the drive recorder 1 proceeds to the process of step S3 described above. On the other hand, if it is less than the right turn threshold value, the drive recorder 1 ends this operation as it is.

  If the direction is the left direction in step S1B, the drive recorder 1 determines whether or not the left turn G value is equal to or greater than the left turn threshold value in step S4. If it is greater than or equal to the left turn threshold, the drive recorder 1 proceeds to the process of step S5 described above. On the other hand, if it is less than the left turn threshold, the drive recorder 1 ends this operation as it is.

  According to the drive recorder of the second embodiment, the right turn threshold and the left turn threshold compared with the G value detected by the G sensor can be easily specified by interlocking with the turn signal instruction. Even if the output signal of the G sensor has the same sign on the left and right, these comparisons are easy.

(Third embodiment)
In the third embodiment, a case where the threshold for turning is set separately for a case where the vehicle speed is low and a case where the vehicle speed is high is shown. Since the configuration of the drive recorder of the third embodiment is the same as that of the first embodiment, the description thereof is omitted by using the same reference numerals.

  FIG. 5 is a flowchart showing an operation procedure of the drive recorder 1 in the third embodiment. This control program is stored in the ROM 10a and executed by the CPU 10. About the same step process as the said 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the same step number.

  FIG. 6 is a diagram showing a threshold table 60 in which a threshold for turning corresponding to the vehicle speed is set. In the threshold table 60, a left turn threshold and a right turn threshold when the vehicle speed is low are registered. Here, 1.4G is set as the threshold value for low speed and left turn. Also, 1.6G is set as a threshold for low speed and right turn.

  Further, a left turn threshold and a right turn threshold when the vehicle speed is high are registered. Here, 0.6G is set as the threshold for high speed and left turn. Further, 0.8G is set as a threshold for high speed and right turn.

  When the G value is output from the lateral G sensor 22b in step S1, the drive recorder 1 determines whether or not the speed detected by the speed sensor 23 is higher than a predetermined value (for example, 40 km / h). (Step S1C).

  When the speed is higher than the predetermined value, the drive recorder 1 sets a right turn threshold and a left turn threshold at the time of high speed (step S1D). On the other hand, if it is less than the predetermined value, the drive recorder 1 sets a right turn threshold and a left turn threshold at low speed (step S1E). After the processes of steps S1D and S1E, the drive recorder 1 proceeds to the process of step S2.

  According to the drive recorder of the third embodiment, the threshold for low speed and the threshold for high speed are set for each right turn and left turn according to the speed of the vehicle, respectively. The determination accuracy of dangerous driving can be improved.

  In addition, as the vehicle speed increases, the first threshold value and the second threshold value are set to smaller values. Therefore, even if a relatively small acceleration occurs when turning at a high speed, it can be determined that the vehicle is in dangerous driving. Moreover, it is possible to determine appropriately at each time of turning right and turning left.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration that can achieve the function of the configuration of the present embodiment is applicable.

  For example, although the case where the acceleration generated in the vehicle is detected by the G sensor (acceleration sensor) has been described in the above embodiment, the acceleration may be calculated from the time change of the vehicle speed detected by the speed sensor. In addition, a GPS receiver can be mounted and detected from a change in the current position of the vehicle.

  Moreover, it is also possible to apply the threshold value setting according to the vehicle speed in the third embodiment to the process of interlocking with the winker of the second embodiment.

  In the third embodiment, the left-turn threshold and the right-turn threshold are set for two cases of low and high vehicle speeds. However, the threshold is set for three or more vehicle speeds. It may be set, or a continuous threshold may be set as a function without being divided.

  Moreover, although the case where it applied to the drive recorder as an in-vehicle device was shown in the said embodiment, you may apply to a digital tachograph and a car navigation apparatus.

  INDUSTRIAL APPLICABILITY The present invention is useful because it can improve the accuracy of determination of dangerous driving of a vehicle during a turn by using threshold values suitable for right and left turns when determining dangerous driving of the vehicle.

1 Drive recorder 10 CPU
10a ROM
10b Data memory 11, 12, 13, 17, 18 Interface (I / F)
14, 15 Memory card 16 RAM
21 Camera 22 G sensor 22a Front and rear G sensor 22b Lateral G sensor 23 Speed sensor 24 Speaker 25 Winker switch (SW)
40 Recording trigger setting screen 41, 42, 43, 44 Box 60 Threshold table

Claims (4)

An in-vehicle device is a dangerous driving determination method for determining dangerous driving of a vehicle,
A first threshold value applied when the vehicle turns to the right and a second threshold value applied when the vehicle turns to the left and different from the first threshold value are set in the in-vehicle device,
Detected by the acceleration detection unit when the vehicle turns right, detected by the acceleration detection unit when the acceleration value generated in the vehicle is equal to or greater than the first threshold, or when the vehicle turns left, When the value of acceleration generated in the vehicle is equal to or greater than the second threshold, the in-vehicle device determines that the vehicle is in a dangerous driving state.
A dangerous driving determination method characterized by the above.   The dangerous driving determination method according to claim 1, wherein the second threshold value is smaller than the first threshold value. When the turn signal indicating the direction of travel of the vehicle is instructing a right turn, it is determined whether or not the acceleration value is equal to or greater than the first threshold value.
3. The dangerous driving determination method according to claim 1, wherein when the turn signal indicates a left turn, it is determined whether or not the acceleration value is equal to or greater than the second threshold value. 4. An acceleration detector that detects lateral acceleration generated in the vehicle;
A first threshold that is applied when the vehicle makes a right turn, and a registration unit that is applied when the vehicle makes a left turn and has a second threshold different from the first threshold; and
The acceleration value detected by the acceleration detector when the vehicle turns right is greater than or equal to the first threshold, or when the vehicle turns left, the acceleration value detected by the acceleration detector is A determination unit that determines a dangerous driving when the second threshold value or more;
A vehicle-mounted device comprising:

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