JP2017107483A - Detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of accurately detecting near-miss.SOLUTION: A detection device includes: a state value acquisition part (S110) that acquires a state value as a value which changes corresponding to an operation amount of a brake during the operation of the brake continues, and which gets larger as the operation amount of the brake gets larger; a determination time detection part (S135) that detects a determination time as a time from the operation of the brake starts to a point when the state value exceeds a predetermined state threshold value; and a determination section (S150) that, when the determination time is smaller than a determination threshold value, determines that an attention event has occurred as an event to which an attention should be paid during driving the vehicle.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for detecting that an event requiring attention for a driver of a vehicle has occurred.

  2. Description of the Related Art Conventionally, there has been known a technique for determining that an event requiring attention to a driver (hereinafter referred to as a near-miss) has occurred in driving a vehicle even if no accident occurs. Patent Document 1 discloses a technique for determining that a near-miss has occurred when the acceleration of a vehicle is acquired and the acceleration exceeds a predetermined threshold.

JP2013-117777A

  However, in the technique described in Patent Document 1, for example, an event that avoids danger such as a collision by instantaneously performing a brake operation in which the acceleration does not exceed the threshold value shown in Patent Document 1 There was a problem of being removed.

  Further, in the technique described in Patent Document 1, for example, a driver who is immature in driving technology continues to step on the brake before reaching the temporary stop point at the temporary stop point, and finally presses the brake strongly to stop. However, there is a problem that an event that is undesirable to be detected as a near-miss is detected as a near-miss.

  An object of the present invention is to provide a technique for accurately detecting a near miss.

  One aspect of the present invention is a detection device, which includes a state value acquisition unit (S110), a determination time detection unit (S135), and a determination unit (S145). The state value acquisition unit obtains a state value that is a value that changes corresponding to the amount of operation of the brake while the operation of the brake is continued, and that increases as the amount of operation of the brake increases. get. The determination time detection unit detects a determination time that is a time from when the brake operation is started until the state value becomes equal to or greater than a predetermined state threshold. When the determination time is less than a predetermined determination threshold, the determination unit determines that a caution event, which is an event that requires attention in driving the vehicle, has occurred.

  That is, while the brake operation is being performed, for example, a state value representing the vehicle state that changes based on the brake operation, such as acceleration in the deceleration direction of the host vehicle or the amount of depression of the brake pedal, is acquired. When an acquired value is equal to or greater than a predetermined state threshold, if a determination time required to reach the state threshold is less than a predetermined determination threshold, it is determined that an attention event has occurred. .

  According to this, only the state value is used to determine whether or not a caution event has occurred based on both the state value and the determination time that is the brake operation time until the state value exceeds the threshold value. Therefore, the occurrence of a caution event can be determined more accurately than in the prior art for determining a caution event.

  In addition, the code | symbol in the parenthesis described in this column and a claim shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The technical scope of this invention is shown. It is not limited.

The block diagram which shows the structure of a drive recorder and a control part. The flowchart showing the determination processing of 1st Embodiment. The figure showing an example of the time change of the deceleration acceleration when it determines with it being a caution event in 1st Embodiment. The figure showing an example of the time change of the deceleration acceleration when it determines with not being a caution event in 1st Embodiment. The flowchart showing the determination processing of 2nd Embodiment. The figure showing an example of the time change of the deceleration acceleration when it determines with it being a caution event in 2nd Embodiment. The figure showing an example of the time change of the deceleration acceleration when it determines with not being a caution event in 2nd Embodiment.

Embodiments to which the present invention is applied will be described below with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
A drive recorder 1 shown in FIG. 1 is mounted on a vehicle. Hereinafter, a vehicle on which the drive recorder 1 is mounted is referred to as a host vehicle. The drive recorder 1 includes a GPS receiver 10, an acceleration sensor 20, a brake on / off sensor 30, a communication unit 40, a storage unit 50, and a control unit 60.

The GPS receiver 10 acquires a position signal for detecting the position of the host vehicle from a GPS satellite.
The acceleration sensor 20 detects the magnitude of the deceleration acceleration, which is the acceleration along the traveling direction of the host vehicle, and is the acceleration when the host vehicle decelerates, and outputs a signal representing the magnitude of the deceleration acceleration.

  The brake on / off sensor 30 refers to a sensor that detects an on state in which a brake operation (hereinafter referred to as a brake operation) is performed by a driver and an off state in which a brake operation is not performed. The brake operation being performed means that a load is applied to the brake pedal by the driver and the brake pedal is depressed. The brake operation not being performed means that no load is applied to the brake pedal by the driver and the brake pedal is not depressed as when the driver removes his / her foot from the brake pedal.

  As an example, the brake on / off sensor 30 of the present embodiment represents a depression amount as an example of an operation amount of the brake pedal, and represents an amount of movement of the brake pedal when a load is applied to the brake pedal by a driver as an angle. And a brake angle detection sensor (not shown) that detects the detected depression angle. The brake angle detection sensor detects the depression angle when the driver does not apply a load to the brake pedal as 0 °.

  The brake on / off sensor 30 outputs a signal indicating the on state when the depression angle detected by the brake angle detection sensor is greater than 0 °, and outputs a signal indicating the off state when the depression angle becomes 0 °. To do. Note that 0 ° here is not limited to 0 ° in a strict sense, and may not be strictly 0 ° as long as a desired effect is achieved.

The communication unit 40 performs wireless communication. The communication unit 40 performs so-called vehicle-to-vehicle communication with other devices that perform wireless communication mounted on other vehicles, for example.
The storage unit 50 reads / writes information from / to the memory card 51 inserted in a card slot (not shown). The memory card 51 is a portable external recording device.

  The control unit 60 is configured around a known microcomputer having a CPU 61 and a semiconductor memory (hereinafter, memory unit 62) such as a RAM, a ROM, and a flash memory. Various functions of the control unit 60 are realized by the CPU 61 executing a program stored in the memory unit 62. Further, by executing this program, a method corresponding to the program is executed. The number of microcomputers constituting the control unit 60 may be one or more.

  The controller 60 executes a determination process for determining whether or not a caution event has occurred when a brake operation is performed by the driver. The attention event refers to an event that requires attention to the driver even if an accident does not occur, that is, a so-called near-miss. A near-miss is an event that is likely to lead to an accident even if it does not result in an accident. For example, the heart rate of a driver who has encountered the event and was disappointed is greater than normal. Such an event. The control part 60 may implement | achieve the function implement | achieved by a determination process not only with software, but the one part or all the elements using the hardware which combined the logic circuit, the analog circuit, etc.

[1-2. processing]
The determination process executed by the control unit 60 will be described with reference to the flowchart of FIG. Note that the process shown in FIG. 2 is repeatedly executed when the signal output from the brake on / off sensor 30 changes from the off state to the on state while the ACC switch is on.

  First, in S (step) 100, the control unit 60 acquires the current time. Although not shown, the drive recorder 1 includes a time management device that outputs a real-time clock that is a signal representing the current time. The control unit 60 acquires a real time clock and specifies the current time (hereinafter, time t) based on the real time clock. In addition, the control part 60 may be comprised so that the time management apparatus may be included.

In S105, the control unit 60 records the time t acquired in S100 in the memory unit 62 as a start time ts that is a time when the brake operation is started.
In S <b> 110, the control unit 60 acquires a deceleration acceleration G represented by a signal output from the acceleration sensor 20. The deceleration acceleration G is a value that changes corresponding to the amount of operation of the brake while the brake operation is continued, and is a value that increases as the amount of operation of the brake increases. Similarly, increasing means that the deceleration acceleration G increases as the brake operation amount increases, and the deceleration acceleration G decreases as the brake operation amount decreases.

  The brake operation amount here refers to, for example, the depression amount of the brake pedal described above. The amount of depression may be detected by the depression angle as described above, but is not limited to this. For example, the stepping amount may be detected by a pedaling force that is the magnitude of a load applied to the brake pedal or a movement amount of the brake pedal due to the pedaling force being applied.

  In S115, the control unit 60 determines whether the deceleration acceleration is equal to or greater than an acceleration threshold value. The acceleration threshold value is one of threshold values used for determining whether or not the brake operation performed by the driver is a brake operation for an attention event. In the present embodiment, the fact that the deceleration acceleration G that changes in accordance with the brake operation amount is equal to or greater than the acceleration threshold value is used to determine whether or not the brake operation is for a caution event, as will be described later. . The acceleration threshold value is recorded in the memory unit 62.

  By the way, for example, when avoiding a collision with a pedestrian suddenly jumping out to the pedestrian crossing when the vehicle is traveling in front of the pedestrian crossing, the driver depresses the brake pedal strongly and instantly. There may be a case where a brake operation (hereinafter referred to as a sudden brake operation) for suddenly stopping the vehicle is performed.

  Such a high-risk event in which the driver greatly depresses the brake pedal in a very short time and avoids an accident on the verge of being distinguished from a caution event is called a sudden braking event. The degree of risk means the degree of possibility that an accident will occur. Here, if the threshold set in advance for determining whether the braking operation performed by the driver is a sudden braking event based on the deceleration acceleration G is set as the sudden braking threshold, the acceleration threshold is the sudden braking threshold. Is set to a smaller value.

  Here, the sudden braking event for comparison with the attention event has been described by taking an example of avoiding a collision with a pedestrian on a pedestrian crossing, but the sudden braking event is not limited to this. The target of the sudden braking event is not limited to a pedestrian, but may be another vehicle. Further, the place where the sudden braking operation can be performed is not limited to a pedestrian crossing, but may be various places such as an intersection, a road with a poor view, and a highway.

The control unit 60 shifts the process to S125 when the deceleration acceleration G is greater than or equal to the acceleration threshold, and shifts the process to S120 when the deceleration acceleration is less than the acceleration threshold.
In S120 that is shifted when the deceleration acceleration G is less than the acceleration threshold, the control unit 60 determines whether or not the brake operation is being continued.

  Here, the control unit 60 obtains a signal output from the brake on / off sensor 30, and determines that the brake operation is not continuing when the signal indicates an off state. Then, the process proceeds to S145. On the other hand, the control unit 60 determines that the brake operation is continuing when the signal output from the brake on / off sensor 30 indicates the on state. Then, the process proceeds to S110, and the processes of S110 to S115 are repeated.

In S125 that is shifted when the deceleration acceleration G is equal to or greater than the acceleration threshold, the control unit 60 acquires time t.
In S130, the control unit 60 records the time t acquired in S125 in the memory unit 62 as the end time te.

  In S135, the control unit 60 calculates the determination time Th. The determination time Th is calculated as a value obtained by subtracting the start time ts from the end time te corresponding to the time when the deceleration acceleration becomes equal to or greater than the acceleration threshold.

  In S140, the control unit 60 determines whether or not the determination time Th is less than an acceleration time threshold Ts that is a predetermined threshold. The acceleration time threshold value Ts is recorded in the memory unit 62 in advance. The control unit 60 shifts the process to S150 when the determination time Th is less than the acceleration time threshold Ts, and shifts the process to S145 when the determination time Th is greater than or equal to the acceleration time threshold Ts.

  In S145, the control unit 60 determines that the brake operation by the driver is not a brake operation for the attention event, and ends the determination process. That is, the control unit 60 determines that no attention event has occurred, and ends the determination process.

  In S150, the control unit 60 determines that the brake operation by the driver is a brake operation for a caution event, and causes the process to proceed to S155. That is, the control unit 60 determines that an attention event has occurred, and shifts the processing to S155.

  In S155, the control unit 60 specifies the current position of the host vehicle based on the position signal acquired by the GPS receiver, records the specified current position in the memory unit 62 as the attention position, and ends the determination process. To do. The attention position refers to a position where an attention event has occurred.

  Thus, in this determination process, it is not determined that a caution event has occurred when the deceleration acceleration G exceeds the acceleration threshold value, but the deceleration acceleration G exceeds the acceleration threshold value and the deceleration acceleration G is When the determination time Th, which is the time required to reach the acceleration threshold value or more, is less than the acceleration time threshold value Ts, it is determined that an attention event has occurred.

[1-3. effect]
According to the first embodiment described in detail above, the following effects can be obtained.
[1A] In S110, the control unit 60 is a value that changes corresponding to the amount of operation of the brake while the brake operation is continued, and is a value that increases as the amount of operation of the brake increases. The deceleration acceleration G is acquired. In S135, the control unit 60 detects a determination time Th, which is a time from when the brake operation is started until the deceleration acceleration G becomes equal to or greater than the acceleration threshold value. Furthermore, in S145, when the determination time Th is less than the acceleration time threshold value Ts, the control unit 60 determines that a caution event, which is an event requiring attention in driving the vehicle, has occurred.

  FIG. 3 and FIG. 4 are diagrams showing the time change of the speed V of the host vehicle and the time change of the deceleration acceleration G as a reference in order to explain the effect in the present embodiment. Although not shown, the drive recorder 1 may include a speed sensor for detecting the speed V of the host vehicle. In the figure, symbol A represents a period during which the driver operates the accelerator pedal (hereinafter referred to as accelerator operation period), and symbol B represents a period during which the driver operates the brake pedal (hereinafter referred to as brake operation period). The symbol N represents a period during which the driver does not operate either the accelerator pedal or the brake pedal (hereinafter, non-operation period).

  Here, FIG. 3 is a diagram showing an example of the driver's brake operation by the time change of the deceleration acceleration G. FIG. In FIG. 3, time t1 corresponds to start time ts, time t2 corresponds to end time te, and a value obtained by subtracting time t1 from time t2 corresponds to determination time Th. In FIG. 3, since the determination time Th is less than the acceleration time threshold, the control unit 60 can determine that an attention event has occurred.

  On the other hand, unlike the control unit 60, the caution event is simply determined based on whether or not the deceleration acceleration G exceeds the acceleration threshold, and the acceleration threshold is set to the above-described sudden braking threshold. In such a comparative example, even if the event is not as dangerous as a sudden braking event, it is impossible to detect a caution event that would call attention to the driver.

  On the other hand, FIG. 4 shows that a driver unfamiliar with driving recognizes a stop sign in front of the road on which the host vehicle is traveling and gradually stops the host vehicle from a very short distance before the stop line. FIG. 6 is a diagram illustrating a brake operation when the brake pedal is depressed and the host vehicle is stopped by largely depressing the brake pedal immediately before the stop line, according to a change in deceleration acceleration G over time. In FIG. 4, the determination time Th from when the braking operation is started until the deceleration acceleration G reaches the acceleration threshold is longer than that in the case of FIG. In the example of FIG. 4, the brake pedal is greatly depressed so as to be equal to or greater than the acceleration threshold immediately before the stop line. Since the vehicle speed is gradually decreasing, it is desirable to judge that it is not an attention event.

  In FIG. 4, time t4 corresponds to start time ts, time t5 corresponds to end time te, and a value obtained by subtracting time t4 from time t5 corresponds to determination time Th. In the present embodiment, the control unit 60 can determine that the case as illustrated in FIG. 4 is not an attention event when the determination time Th is equal to or greater than the acceleration threshold time. On the other hand, unlike the control unit 60, in the comparative example in which the attention event is determined based on whether or not the deceleration acceleration G exceeds the acceleration threshold value, the case as shown in FIG. There is a risk of misjudging.

  The control unit 60 determines whether or not the deceleration acceleration G exceeds the acceleration threshold value, and whether or not the determination time Th that is a brake operation time until the deceleration acceleration G becomes equal to or greater than the acceleration threshold value is less than the acceleration time threshold value Ts. Whether or not an attention event has occurred is determined based on the two determinations. Therefore, the control unit 60 can determine the occurrence of the attention event more accurately than the comparative example in which the attention event is simply determined based on whether or not the deceleration acceleration G exceeds the acceleration threshold value.

  [1B] In S135, the control unit 60 detects, as the determination time Th, the time from when the brake operation is started until the deceleration acceleration G, which is the acceleration when the vehicle decelerates, exceeds the acceleration threshold value. Also good. According to this, the attention event can be accurately determined based on the deceleration acceleration G and the determination time Th.

  [1C] The acceleration threshold value may be set to a value smaller than a sudden brake threshold value that is a threshold value for determining a sudden brake event that is a higher risk event than an attention event. According to this, even if the event is not as dangerous as a sudden braking event, an event that wants to alert the driver can be detected as a caution event.

  For example, when the driver recognizes the danger and starts the braking operation, if the driver determines that the danger can be avoided by the deceleration of the host vehicle, the driver operates the brake so as to reduce the amount of depression of the brake pedal. Can be considered. For example, when the driver recognizes that another vehicle is coming out of the parking lot and starts the brake operation, when the vehicle notices the own vehicle and stops, the driver sets the depression amount of the brake pedal. It is conceivable that the vehicle passes by performing a brake operation so as to decrease.

  All of these events are events in which the deceleration acceleration G does not exceed the sudden braking threshold. However, in the present embodiment, since the acceleration threshold that is the threshold of the deceleration acceleration G is set to a value smaller than the sudden braking threshold, these events can be detected as attention events.

  [1D] The control unit 60 may acquire a caution position that is the current position of the host vehicle when it is determined that a caution event has occurred in S155, and may record the caution position in the memory unit 62 in S160. According to this, for example, when the vehicle is located at the caution position recorded in the memory unit 62, the notification of the caution position is performed such that notification is given by voice or image for urging the driver to pay attention. It can be used to support driving of vehicles.

  In the first embodiment, the control unit 60 corresponds to an example of a detection device. The control unit 60 corresponds to an example of a state value acquisition unit, a determination time detection unit, a determination unit, a caution position acquisition unit, and a recording unit. Further, S110 corresponds to an example of processing as a state value acquisition unit, S135 corresponds to an example of processing as a determination time detection unit, and S145 corresponds to an example of processing as a determination unit. Further, S155 corresponds to an example of processing as a caution position acquisition unit, and S160 corresponds to an example of processing as a recording unit.

[2. Second Embodiment]
[2-1. Difference from the first embodiment]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, the description of the common configuration will be omitted, and the description will focus on the differences. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description is referred to.

  In the first embodiment described above, whether or not a caution state has occurred is determined based on the deceleration acceleration G. On the other hand, a state value other than the deceleration acceleration G may be used to determine whether an attention state has occurred. The state value is a value that changes corresponding to the amount of operation of the brake while the operation of the brake is continued, and is a value that increases as the amount of operation of the brake increases.

Specifically, in addition to the deceleration acceleration G, the amount of change in the deceleration acceleration with respect to time, the depression angle detected by the brake angle detection sensor, the variation in the depression angle, and the like are increased.
The second embodiment is different from the first embodiment in that it is determined whether or not a caution state has occurred using the amount of change in deceleration acceleration as a state value.

[2-2. processing]
The determination process in the present embodiment will be described with reference to the flowchart of FIG.
In S100 to S105, the control unit 60 executes the same process as in the first embodiment. That is, the control unit 60 acquires the time t and records the time t in the memory unit 62 as the start time ts.

In S106, the control unit 60 acquires the deceleration acceleration G.
In S107, the control unit 60 records the deceleration acceleration G acquired in S106 in the memory unit 62 as the start acceleration Gs.

In S110, the control unit 60 deceleration acceleration G is acquired.
In S111, the control unit 60 records the deceleration acceleration G acquired in S110 in the memory unit 62 as the end acceleration Ge.

  In S112, the control unit 60 calculates a change amount (hereinafter referred to as acceleration change amount) H of the deceleration acceleration with respect to time. In this step, the control unit 60 calculates the difference between the end acceleration Ge and the start acceleration Gs as the acceleration change amount H, and records the calculated acceleration change amount H in the memory unit 62.

  In S116, the control unit 60 determines whether or not the acceleration change amount H is equal to or greater than a predetermined change amount threshold value. The change amount threshold is a state threshold when the acceleration change amount H is a state value. The state threshold is a threshold used to determine whether or not the brake operation performed by the driver is a brake operation for a caution event based on the state value. That is, the fact that the acceleration change amount H that changes in response to the brake operation amount is equal to or greater than the change amount threshold is used to determine that the brake operation is for a caution event, as will be described later. The change amount threshold value is recorded in the memory unit 62.

The controller 60 shifts the process to S125 when the acceleration change amount H is equal to or greater than the change amount threshold, and shifts the process to S120 when the acceleration change amount H is less than the change amount threshold.
In S120, which is shifted when the acceleration change amount H is less than the change amount threshold, the control unit 60 determines whether or not the brake operation is being continued, as in the first embodiment. Here, the control part 60 transfers a process to S145, when brake operation is not continuing. On the other hand, when the brake operation is continuing, the control unit 60 shifts the process to S110 and repeats the processes of S110 to S116.

  In S125 to S160, the same processing as in the first embodiment is executed. In other words, when the acceleration change amount H exceeds the change amount threshold value, the control unit 60 determines that the determination time Th, which is a brake operation time until the acceleration change amount H becomes equal to or greater than the change amount threshold value, is equal to or greater than the change time threshold value Tr. If it is, it is determined that no attention event has occurred (S145). On the other hand, the control unit 60 determines that an attention event has occurred when the determination time Th is less than the change time threshold Tr (S150). When it is determined that a caution event has occurred, the control unit 60 acquires the current position of the host vehicle (S155), and records the acquired current position in the memory unit 62 as the caution position (S160). The process ends.

[2-3. effect]
According to the second embodiment described in detail above, the following effects are obtained in addition to the effects [1A] and [1D] of the first embodiment described above.

  [2A] In S135, the control unit 60 determines that the change amount of the deceleration acceleration G that is the rate of change of the speed when the vehicle decelerates, that is, the acceleration change amount H is the state value after the brake operation is started. Alternatively, the time until the change threshold value that is the state threshold value is exceeded may be detected as the determination time Th.

FIGS. 6 and 7 are diagrams showing temporal changes in the speed V of the host vehicle and temporal changes in the deceleration acceleration G as a reference in order to explain the effects in the present embodiment.
Here, in FIG. 6, the time t7 corresponds to the start time ts, the time t8 when the acceleration change amount H is equal to or greater than the change amount threshold corresponds to the end time te, and the value obtained by subtracting the time t7 from the time t8 is the determination time. Corresponds to Th. In FIG. 6, the control unit 60 can determine that an attention event has occurred because the determination time Th is less than the change time threshold.

  On the other hand, FIG. 7 shows the brake operation when the driver decelerates the host vehicle with the engine brake in advance from time t10 to t11 and then attempts to stop the host vehicle by stepping on the brake pedal after time t11. It is the figure shown by the time change of the acceleration G. FIG.

  In the example of FIG. 7, since the deceleration acceleration G is increased in advance by engine braking, the time until the deceleration acceleration G reaches the acceleration threshold is shorter than when the host vehicle is not decelerated by the engine brake. Become. However, the case of FIG. 7 is a case where it is desirable to determine that it is not a caution event because it has been decelerated in advance by engine braking.

  In FIG. 7, the time t11 corresponds to the start time ts, the time t12 when the acceleration change amount H is equal to or greater than the change amount threshold corresponds to the end time te, and the value obtained by subtracting the time t11 from the time t12 corresponds to the determination time Th. To do. In the present embodiment, the control unit 60 can determine that the case as illustrated in FIG. 7 is not an attention event when the determination time Th is equal to or greater than the change time threshold Tr.

  As described above, the control unit 60 of the present embodiment indicates whether or not the acceleration change amount H exceeds the change amount threshold value, and the brake operation time until the acceleration change amount H becomes equal to or greater than the change amount threshold value. It is determined whether or not an attention event has occurred based on two determinations: whether or not the determination time Th is less than the change time threshold Tr. Therefore, the control unit 60 can determine the occurrence of the attention event more accurately than the comparative example in which the attention event is simply determined based on whether or not the deceleration acceleration G exceeds the acceleration threshold value.

[3. Other Embodiments]
As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the above-mentioned embodiment, It can implement in various deformation | transformation.

  [3A] In the above embodiment, the deceleration acceleration G is acquired based on the signal output from the acceleration sensor 20, but the acquisition of the deceleration acceleration G is not limited to the acceleration sensor 20. For example, when the drive recorder 1 includes a vehicle speed sensor that detects the vehicle speed of the host vehicle, the deceleration acceleration G is a value obtained by differentiating the amount of decrease in the vehicle speed with time based on a signal representing the vehicle speed output from the vehicle speed sensor. It may be used. Further, the change amount of the value obtained by differentiating the decrease amount of the vehicle speed may be used as the acceleration change amount H.

  [3B] In the above embodiment, whether or not an attention event has occurred based on the determination time Th when the deceleration acceleration G is used as the state value or the determination time Th when the acceleration change amount H is used as the state value. Judged. On the other hand, the state value when a predetermined time has elapsed since the brake operation was started is acquired, and the attention event occurs when the state value at this time is equal to or greater than the state threshold value. You may judge. The predetermined time here corresponds to, for example, the acceleration time threshold value Ts when the deceleration acceleration G is used as the state value, and corresponds to the change time threshold value Tr when the acceleration change amount H is used as the state value. .

  [3C] In the above embodiment, the brake on / off sensor 30 detects an on state or an off state based on the brake operation amount, that is, based on the brake depression amount represented by the depression angle of the brake pedal. However, it is not limited to this. For example, the brake on / off sensor 30 may detect an on state or an off state based on a brake depression amount represented by a depression force, a movement amount of a brake pedal, or the like. The brake on / off sensor 30 may detect an on state when the brake lamp is lit and detect an off state when the brake lamp is off.

  [3D] In the above embodiment, the deceleration acceleration G and the acceleration change amount H are used as state values to determine whether or not an attention event has occurred. However, the present invention is not limited to this. For example, it may be determined whether or not a caution event has occurred by using the depression angle, the depression force, the amount of movement of the brake pedal, and the like, and the amount of change with respect to these times as state values.

  [3E] In the above embodiment, the communication unit 40 is a device that performs vehicle-to-vehicle communication, but is not limited thereto. The communication unit 40 may be, for example, a device that performs wireless communication with a management center that records and manages attention information transmitted from the drive recorder 1 mounted on each vehicle. In this case, the drive recorder 1 may request the management center to transmit the current position of the host vehicle and to transmit information representing the attention position around the current position of the host vehicle.

  [3F] The functions of one component in the embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified only by the wording described in the claim are embodiment of this invention.

  [3G] In addition to the control unit 60 and the drive recorder 1 described above, a program for causing the control unit 60 to function, a non-transitory actual recording medium such as a semiconductor memory in which the program is recorded, a method for detecting an attention event, etc. The present invention can also be realized in various forms.

  60 control unit, 61 CPU.

Claims (5)

A state value acquisition unit that acquires a state value that changes in accordance with the amount of operation of the brake and increases as the amount of operation of the brake increases while the operation of the brake is continued (S110),
A determination time detection unit that detects a determination time that is a time from when the brake operation is started until the state value becomes equal to or greater than a predetermined state threshold value (S135);
A determination unit (S150) for determining that a caution event, which is an event requiring attention in driving the vehicle, occurs when the determination time is less than a predetermined determination threshold;
A detection device (60) comprising: The detection device according to claim 1,
The determination time detection unit detects, as the determination time, a time from when a brake operation is started until a deceleration acceleration, which is an acceleration when the vehicle decelerates, becomes equal to or greater than the state threshold as the state value. Detection device. The detection device according to claim 1,
The determination time detection unit is a time from when a brake operation is started until a change amount of a deceleration acceleration, which is a rate of change in speed when the vehicle decelerates, becomes equal to or greater than the state threshold value as the state value. Detecting as said judgment time. The detection apparatus characterized by the above-mentioned. The detection device according to any one of claims 1 to 3,
The state threshold is a value smaller than a sudden brake threshold that is a threshold for determining an event having a higher degree of danger than the attention event. The detection device according to any one of claims 1 to 4,
A caution position acquisition unit (S155) for acquiring a caution position that is the position of the host vehicle when it is determined by the determination unit that a caution event has occurred;
A recording unit (S160) for recording the attention position on a recording device;
A detection device comprising: