JPH07277230A - Vehicle data storage device - Google Patents

Abstract

PURPOSE:To ensure that desired recordings are stored in a small memory capacity by eliminating wasteful recordings. CONSTITUTION:It is determined whether or not an ABS is operating and whether or not any sudden steering has been made (step 100, 110), and if as a result a sudden change in vehicle behavior is detected, the possibility of the vehicle making a collision is recognized and vehicle data for a subsequent specified period are recorded and stored (step 200, 210). If no sudden change in behavior is detected, it is determined whether or not a collision has occurred based on a touch sensor for detecting the touch of the vehicle with another object and a high-G sensor (step 120, 130), and if a collision is detected, vehicle data for specified periods are recorded and stored (step 310, 410).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle data recording device, and more particularly to a vehicle data recording device for recording and holding various vehicle information in the event of a vehicle collision.

[0002]

2. Description of the Related Art Conventionally, a vehicle data recording device for recording and holding various vehicle data in the event of a vehicle collision is known. For example, Japanese Utility Model Laid-Open No. 1-178697 discloses that the outputs of various on-vehicle sensors mounted on a vehicle are constantly written in a memory having a predetermined capacity, and when a collision is detected, the output writing of the on-vehicle sensor is stopped after a predetermined time has elapsed. A device for recording and holding vehicle data in a predetermined period before and after a collision is disclosed.

That is, according to the apparatus described in the above publication,
Before the collision is detected, the memory record is updated at any time, and the past vehicle data corresponding to the memory capacity is always recorded. When the output writing of the vehicle-mounted sensor is stopped after a predetermined period after the collision is detected, the vehicle data record for the predetermined period written before the stop is held.

In this case, as a result, the vehicle data for a predetermined period before and after the collision is recorded and held in the memory, and the vehicle behavior before and after the collision can be appropriately estimated by analyzing the data. It will be possible.

[0005]

However, the above-mentioned conventional device is configured to retain the record of vehicle data on the basis of whether or not a collision has occurred in the vehicle. Therefore, when the vehicle data is recorded, the collision does not occur. It is fixed to a predetermined period before and after the detected time point as a reference.

On the other hand, the period from the occurrence of a change in vehicle behavior that causes a collision to the actual collision of the vehicle is not necessarily uniform, and a collision may occur before the collision, which may cause a behavior change. It is also known empirically.

Therefore, in the structure in which the recording period of the vehicle data is fixed to the predetermined period before and after the collision detection as in the above-mentioned conventional apparatus, when all the behavior changes to be detected before the collision cannot be recorded or there is no special behavior. It is assumed that data is recorded during a period without change, and in order to realize reliable data recording, it is necessary to use a large-capacity memory in advance assuming a wasteful area.

The present invention has been made in view of the above-mentioned points, and in addition to record holding control in a collision mode for recording vehicle data for a predetermined period before and after a vehicle collision is detected, the vehicle behavior An object of the present invention is to provide a vehicular data recording device that solves the above problems by performing record holding control in a behavior sudden change mode in which vehicle data for a predetermined period is recorded when a sudden change is detected.

[0009]

FIG. 1 is a principle block diagram of a vehicle data recording apparatus which achieves the above object. That is, the above-mentioned object is, as shown in FIG. 1, a recording means M2 for recording the outputs of various vehicle-mounted sensors M1 mounted on the vehicle.
And collision detection means M3 for detecting a vehicle collision,
In a vehicle data recording device that records and holds an output of an on-vehicle sensor M1 before and after a vehicle collision, a behavior sudden change detection means M4 for detecting a sudden change in vehicle behavior, and the collision detection means M.
When a vehicle collision is detected by 3, the record holding control in the collision mode is performed in order to keep the output records of the on-vehicle sensor M1 regarding the vehicle behavior before and after the collision, and the behavior sudden change detection means M4. When a sudden change in the vehicle behavior is detected, a record holding control means M5 for performing the record holding control in the sudden behavior changing mode in order to hold the output record in a predetermined period after the behavioral change of the sensor related to the vehicle behavior among the in-vehicle sensors M1. This is achieved by a vehicle data recording device provided.

Further, in the vehicle data recording apparatus having the above-mentioned structure, the contact confirmation means M6 is provided for transmitting a contact confirmation signal to the record holding control means M5 when the contact between the vehicle and another object is confirmed. , The record holding control means M5
The vehicle data recording device that cancels the record holding state of the vehicle behavior recorded in the sudden behavior change mode when the contact confirmation signal is not received after execution of the record retaining control in the sudden behavior change mode is also effective.

[0011]

In the first aspect of the present invention, the sudden behavior change detection means M4 detects a sudden behavior change that is expected to cause a vehicle collision, and sends the detection result to the record holding control means M5. To do.

When a sudden change in vehicle behavior is detected, the record holding control means records the data relating to the vehicle behavior supplied from the vehicle-mounted sensor M1 to the recording means M2 on the assumption that a collision will occur thereafter. Start holding control. Therefore, the record of the vehicle data after the sudden change of the vehicle behavior can be surely retained regardless of the time required until the actual collision after the sudden change of the vehicle behavior.

When a collision occurs in the vehicle without the sudden change in behavior being detected by the sudden change behavior detecting means M4, the situation is detected by the collision detecting means M3. In this case, the record holding control means M5 executes the record holding control in the collision mode, but it is not necessary to record the behavior change before the collision for a long time, and mainly the vehicle data after the collision is recorded. Since it is sufficient to retain the data, it is possible to store sufficient data with a relatively small memory capacity.

Further, in the second aspect of the present invention, when the contact confirmation means M6 does not confirm the contact between the vehicle and another object after the record holding control in the behavior sudden change mode is executed, the recording means M2 is used. The record retention of the vehicle data in is released. Therefore, even if the behavior changes suddenly,
If a collision does not occur thereafter, the vehicle data after the sudden change in behavior will be erased after that, and useless recording in the analysis at the time of collision is prevented.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 and FIG. 3 are block configuration diagrams showing the overall configuration of a vehicle data recording apparatus according to an embodiment of the present invention.
FIG. The drive recorder 12 which is a vehicle data recording device provided in the vehicle 10 will be described below with reference to these drawings.

The drive recorder 12 has a strong casing 14 in the inside of the vehicle 10, for example, in the lower part of the seat so that the inside is not damaged by an impact at the time of a vehicle collision.
It is housed and placed in.

That is, inside the casing 14, FIG.
As shown in FIG. 3, a drive recorder ECU 16 (hereinafter simply referred to as ECU 16) and a memory unit 18 are housed. Further, the ECU 16 is a control device mainly composed of a microcomputer (not shown), and has a built-in power supply 2
0, an operation indicator lamp 22, an emergency state detection unit 24, a signal processing unit 26, a built-in clock 28, and a writing control unit 30.

The built-in power source 20 is a power source for each component in the drive recorder 12. For example, when an ignition switch (not shown) is turned on, the built-in power source 20 is charged by the power source from the battery of the vehicle 10 and the power source is cut off. Also enables supply of power to each component in the drive recorder 12.

When the write control unit 30 prohibits the writing of data to the memory unit 18 and records and saves the data as described later, the operation indicator lamp 22 is turned on to the outside by the lighting of the LED. It is a lamp that notifies. The operation indicator lamp 22 may be arranged on the instrument panel or the like.

The signal processing unit 26 is equipped with various sensors for detecting information such as the impact applied to the vehicle, the behavior of the vehicle, the operation state by the driver, the state around the vehicle, the position where the vehicle is present, etc. Are connected. Then, the signal processing unit 2
Reference numeral 6 converts signals output from these sensors and the like into a state recordable in the memory unit 18 and outputs the signals to the write control unit 30.

The signals input to the signal processor 26 will be described below.

That is, the engine ECU 32 controls the vehicle 10
The ECU 32 outputs an engine speed, an accelerator opening degree, a transmission shift position, and the like. The operating state of the engine can be detected from the output signal of this.

The air conditioner ECU 34 is an electronic control unit for controlling the air conditioning in the room of the vehicle 10. The ECU 34 outputs the temperature outside the vehicle, the temperature inside the vehicle, the operating state of the air conditioning, and the like. The driving environment of the driver can be detected from these output signals.

The vehicle speed sensor 36 is a sensor that outputs the traveling speed of the vehicle. In addition, the wheel speed sensor 38 is
The rotation speed of each wheel included in 0 is detected. The yaw rate sensor 40 outputs each rotation speed around the vertical axis about the center of gravity of the vehicle 10, and the foot brake sensor 42 outputs whether or not the driver operates the foot brake. Further, the steering sensor 44 generates a pulse signal corresponding to the direction in which the driver operates the steering wheel 46 (see FIG. 3) and the operation angle.

Note that these sensors are, for example, a vehicle equipped with a suspension control, an anti-lock brake system, etc., and an ECU for controlling them.
Is provided, the output from the ECU may be used.

Further, the parking brake sensor 48 is
The operation of the parking brake is output, the seatbelt switch 50 detects the seatbelt wearing state of the occupant, and the seatbelt load sensor 52 detects the load acting on the seatbelt and outputs according to the load. Emit. The seatbelt load sensor 52 can be realized, for example, by providing a seatbelt device with a strain gauge that outputs an output according to the load generated in the seatbelt.

The lighting sensor 54 detects and outputs the lighting status of each lighting device such as the headlight, tail lamp, turn signal lamp of the vehicle 10 and the disconnection status thereof.
Here, when a light control unit is provided for the headlight or the like, those signals may be taken in from the light control unit.

The image pickup device 56 is provided with a plurality of CCD cameras or the like to pick up an image of the surroundings of the vehicle and output a video signal. The presence of pedestrians and other vehicles around the vehicle 10 and their behaviors can be detected from this video signal.

The obstacle detection sensor 58 is, for example, a device that detects an obstacle ahead of the vehicle 10 in the traveling direction and calculates and outputs processing up to the obstacle. For example, a known radar device may be used. Composed. The image pickup device 56 and the obstacle sensor 58 are arranged so that the situation around the vehicle can be reliably detected.

The output of each of these sensors causes the vehicle 10 to
The operating conditions, surrounding conditions of the vehicle, the driving environment of the driver, and the like can be accurately detected, and the temporal change of these outputs can also detect the temporal change of the above detection items.

In addition to the above-mentioned sensors, the signal processing unit 2
It is also possible to connect a device for judging the existing position of the vehicle 10, surrounding conditions, etc. That is, the navigation system 60 may be, for example, a GPS (Global P
ositioning System) is used to output the vehicle's coordinate position, etc. In addition, the road information system 62 is a device that receives road traffic information and the like by road-to-vehicle communication with an infrastructure provided on the road and detects a surrounding condition of the vehicle 10.

In addition to these, with the understanding of the vehicle manager or the driver, the awakening sensor 64 and the alcohol sensor 6
6 and the like may be provided. Here, the awakening sensor 64 is a sensor that detects the movement of the driver's eyeballs, and detects so-called wobble from each variation of steering steering, and detects the driver's awakening state. The alcohol sensor 66 is a driver. It is a sensor that detects the alcohol content in the breath of. By providing these, it is possible to prove that the driver was in a normal state.

The signal processing unit 26 also includes a built-in clock 28.
The date signal from is also input. Then, the signal processing unit 26
Outputs the date and time as vehicle data to the writing control unit 30 as necessary, together with the various information supplied from the outside.

By the way, the signal processing unit 2 in the ECU 16
The emergency detection unit 24 connected to the vehicle 6 includes an in-vehicle airbag ECU 68, a high G acceleration sensor (hereinafter referred to as a high G sensor) 70, a low G acceleration sensor (hereinafter referred to as a low G acceleration sensor), The bumper switch 72, the hood switch 74, and the contact sensor 76 are connected.

Here, the airbag ECU 68 controls the vehicle 1
It is configured to output a predetermined operation signal when an airbag, which is an occupant protection device provided in No. 0, operates. Further, the high G sensor 70 gives a high acceleration that does not occur in a normal running state, and the low G sensor 71 gives a low acceleration that can occur in a normal running state in the front-rear direction of the vehicle 10 (in the direction of arrow FR in FIG. 3). Components and the left and right components of the front and rear of the vehicle 10 are decomposed and output.

A bumper switch 72, a hood switch 74, and a contact switch 76 shown in FIG. 3 are connected to the emergency state detecting section 24. Especially, in this embodiment, in addition to these sensors, the wheel speed sensor described above is also connected. 38 and the steering sensor 44 are also connected.

Here, the bumper switch 72 and the hood switch 74 are respectively provided on the bumper 78 and the hood hood (hereinafter, simply referred to as hood) 80 of the vehicle 10, and when the hood 80 and the bumper 78 receive an impact from the outside. The contact sensor 76 is a sensor that outputs an electric signal according to the impact received on the vehicle 10. The contact sensor 76 is provided around the vehicle 10 (in FIG. 3, an example is shown in which the side surface of the vehicle 10 is arranged along the vehicle front-rear direction). The sensor is provided and emits a considerable signal when the vehicle 10 is touched.

Here, the emergency state detecting section 24 detects when an acceleration of a predetermined value or more is input from the high G sensor 70, when the bumper switch 72 or the hood switch 74 detects an impact of a predetermined value or more, or the airbag. It is determined that the vehicle 10 has reached an emergency state when a signal indicating that the airbag has been activated is supplied from the ECU 68, or when the contact sensor 76 is activated while the vehicle is traveling, and the writing control unit 30 notifies that effect. Output to.

A manual switch 82 is connected to the emergency detecting section 24 so that an occupant of the vehicle 10 can manually input a signal indicating the emergency state. That is, the emergency state detection unit 24 writes a message to that effect when the above-described various sensors detect that the vehicle 10 is in an emergency state and when the driver inputs that the vehicle 10 is in an emergency state. Output to 30.

By the way, the output signals of the above-mentioned sensors connected to the emergency state detecting section 24 are output to the emergency state detecting section 24.
Is supplied to the signal processing unit 26 via. Therefore, the airbag ECU 68, the high G / low G sensor 70,
The output signals of 71, the bumper switch 72, the hood switch 74, the contact switch 76, and the like are also supplied to the writing control unit 30 similarly to the output signals of other vehicle-mounted sensors.

The writing control section 30 outputs various vehicle data thus supplied from the signal processing section 26 to the memory section 18 to record the data in the memory 18 while sequentially rewriting the data. That is, the memory unit 18 is provided with a memory capacity enough to record data for a predetermined time, and the data for the latest predetermined time is always recorded in the memory capacity.

In this embodiment, the high G sensor 70
Output of 18 seconds, vehicle speed sensor 36, wheel speed sensor 3
8, yaw rate sensor 40, steering sensor 44,
Seat belt switch 50, seat belt load sensor 5
2. Output of an on-vehicle sensor (excluding the high G sensor 70) indicating the vehicle behavior such as the image pickup device 56 and the low G sensor 71 is set to 45 se
c, output of other on-vehicle sensors such as the light sensor 54 for 30s
The memory unit 18 is provided with a memory capacity capable of recording ec.

Here, when the writing control unit 30 receives a signal indicating that the vehicle 10 is in an emergency state from the emergency state detection unit 24, the write control unit 30 holds a predetermined record so as to stop the record update of the data at an appropriate time thereafter. Execute control. As a result, the memory unit 18 retains the vehicle data recorded in the predetermined time before the recording update is stopped, and various vehicle data representing the behavior of the vehicle 10 in the emergency state are saved. It will be.

Further, a data recording stop release switch 84 is connected to the write control unit 30, and by operating the recording stop release switch 84 under a predetermined condition, the write control unit 30 is in a data recording stop state. A signal is issued to command the release. In this case, the memory unit 1
It is possible to release the state in which the record update to 8 is permitted and unnecessary data is recorded and held in the memory unit 18.

By the way, as a method of maintaining the record in the vehicle data recording device, the recording in the memory is stopped after a certain period of time has elapsed after the collision is detected, so that the vehicle data in the predetermined period before and after the collision is recorded. The holding method has been generally used in the past. On the other hand, the drive recorder 12 of the present embodiment is characterized in that the vehicle data is recorded and retained even when the vehicle behavior suddenly changes in addition to the collision detection.

The characteristic operation of the drive recorder 12 of this embodiment will be described below with reference to FIGS.
Here, FIG. 4 is a flowchart of an example of a collision possibility determination routine executed by the emergency state detection unit 24 to satisfy the above function, and FIGS. 5 and 6 are flowcharts of a subroutine of the collision possibility determination routine. FIG. 7 shows an example of a time chart when the above routine is executed.

It is assumed that the vehicle 10 of this embodiment is provided with an antilock brake system (hereinafter referred to as ABS) which is known as a vehicle safety device.

As shown in FIG. 4, when the collision possibility determination routine is started, it is first determined in step 100 whether the ABS is operating. Here, as a method of detecting the operating state of the ABS, it is also possible to receive the supply of the operating signal from an ABS ECU (not shown) that controls the ABS, but in that case, it is necessary to add a new signal line. Occurs.

Therefore, in this embodiment, the wheel speed sensor 3 that is originally connected to the drive recorder 12 is used.
The ABS operation determination is performed using the output of No. 8, and therefore the ABS operation determination is specifically performed by the subroutine shown in FIG. 5, that is, the ABS operation determination routine. The ABS operation determination routine is a routine interrupt routine that is activated every predetermined time (every 5 msec in this embodiment).

When the ABS operation determination routine is activated, first, at step 101, it is determined whether or not there is a pulse input from the wheel speed sensor 38 within the sampling time of 5 msec. If it is determined that there is a pulse input, it is determined that the wheels are not locked, that is, it is determined that the ABS is in the inoperative state, and step 10
Go to 2.

Then, in step 102, the vehicle speed is calculated on the basis of the traveling distance per pulse (predetermined value) of the wheel speed sensor 38 and the pulse-to-pulse time (actually measured value), and the ABS is inoperative in step 103. In order to display, the ABS flag is set to "0" and the processing of this time is ended. In the present embodiment, the vehicle speed is 14 km in relation to the number of pulses generated by the wheel speed sensor 38 per revolution.
Detected when / h or more.

On the other hand, in step 101, 5 msec
If it is determined that there is no pulse input within the sampling time of, the process proceeds to step 104, and it is determined whether the vehicle speed detected in the second previous time (that is, 10 msec before) is 20 km / h or more.

If the vehicle speed two times before is less than 20 km / h, the wheels may decelerate to less than 14 km / h without locking, so the routine proceeds to step 105 and the previous (that is, 5 msec before) Considering the vehicle speed as the current vehicle speed,
Thereafter, the process of step 103 is executed, and the process this time is ended.

On the other hand, if it is determined in step 104 that the vehicle speed two times before the vehicle speed is 20 km / h or more, it is determined that the wheels are locked and the ABS is operating, and the routine proceeds to step 106. If this condition is met and the wheels are not locked, the vehicle speed will be 6 km / h in 10 msec.
This is because it has been decelerated and the deceleration of about 17 G has occurred, which is unreasonable.

In this case, it is assumed that the vehicle speed is "0 km / h" because the wheels are locked in step 106, and then, for example, the ABS flag is set to "1" to display that the ABS is operating in step 107. Then, the processing of this time is ended.

Therefore, in the collision possibility determination routine shown in FIG. 4, in step 100, it is possible to determine whether or not the ABS is operating by observing the state of the ABS flag displayed as described above.

As a result of the determination of the operating state of the ABS in this way, when it is determined that the ABS is in the non-operating state, the process proceeds to step 110 and it is checked whether the steering wheel 46 is steered. Here, as for the steering state of the steering wheel 46, a subroutine is formed,
Specifically, the determination is made by the sudden steering determination routine shown in FIG. Note that this routine is also a scheduled interrupt subroutine that is activated every predetermined time.

In the sudden steering determination routine shown in FIG. 6, first, at step 111, the steering angle detected based on the output of the steering sensor 44 is divided by a predetermined sampling time to calculate the steering speed.

Next, the routine proceeds to step 112, where it is judged whether or not the steering speed calculated as described above is equal to or higher than a predetermined value. If the steering speed ≧ the predetermined value is not satisfied, the condition is maintained. If the above condition is satisfied, the step 113 is executed. After this, the process of this time is ended after the display is made to indicate that the steering is sudden.

Therefore, in the collision possibility determination routine shown in FIG. 4, in step 110, it is possible to determine whether or not the sudden steering is performed by looking at the displayed contents (for example, the rapid steering flag or the like).

By the way, in this embodiment, the ABS operating state and the steered steering state are determined by
This is to determine whether the vehicle is in a normal driving state or an emergency state based on these. That is, A
It is estimated that the BS operates when the wheels are locked, and therefore the vehicle is temporarily in an unstable state.

The steered steering wheel 46 is steered when an emergency occurs such as to avoid an obstacle or to perform counter-steering. In this case as well, the vehicle is temporarily stopped. It can be inferred that it is in an unstable state.

When such an unstable state occurs, there is a possibility that the vehicle may subsequently collide. In analyzing the cause of the accident later, after the behavior changes suddenly, the vehicle may collide. It is desirable to secure all vehicle data of.

Therefore, in this embodiment, if it is determined in step 100 or step 110 that the ABS is in operation or the steering wheel has been steered steeply, the process proceeds to step 200 and the possibility of collision occurs. If it is determined that there is, then the process proceeds to step 210 and the record holding control in the behavior abrupt change mode is executed in order to hold the record corresponding to the sudden change in the behavior.

Here, the record holding control in the behavior abrupt change mode means the high G sensor 7 as shown in FIGS. 7 (A) to 7 (D).
The record of 0 is 18 seconds after ABS and sudden steering, low G sensor 7
The record of the in-vehicle sensor that detects the vehicle behavior such as 1st is ABS for 45 seconds after the sudden steering, and the ABS for the light sensor 54 etc.
・ It is the control to keep the record for 30 seconds after the sudden steering.

The vehicle behavior is normal before the detection of the ABS / sudden steering, etc., and it is not necessary to keep a record of it, and the high G recorded for specifying the collision timing is
This is because it is enough to record 18 seconds after the sudden change in behavior, and similarly, the data indicating the lighting condition, etc. is not required to be recorded for a long time.

The outputs of the on-vehicle sensors for behavior detection other than the high G sensor 70 are kept for a relatively long time (45 seconds) because of the necessity for behavior analysis.
Since the recording time for high G, which requires high-density recording as compared with others for specifying the collision time, is shortened, the memory unit 1
8 as a whole, its memory capacity can be suppressed to a relatively small amount.

If no sudden change in vehicle behavior is detected in steps 100 and 110, step 120
Bumper switch 72, hood switch 74, contact sensor 76 (hereinafter collectively referred to as touch sensor 7
2 to 76) to see if an output indicating a collision is issued.

If no collision signal is issued from these sensors, the routine proceeds to step 130, where it is judged whether or not the high G sensor has detected G above a predetermined value, and no abnormal G has occurred. In this case, it is determined that the vehicle is in a normal state, and the processing of this time is ended.

On the other hand, when the output of the high G sensor outputs G which cannot occur during normal traveling, step 3
When it is determined that the vehicle has collided in step 00, the record holding control in the collision mode is further executed in step 310, and the processing of this time is ended.

In this embodiment, the touch sensor 7
The cases in which the vehicle collision is detected by 2 to 76 and the cases in which the vehicle collision is detected by the high G sensor 70 are separately distinguished, and different record holding modes are set for both.

That is, in the record holding control in the collision mode executed in step 300, as shown in FIGS. 7 (E) to 7 (H), the output recording of the light sensor 54 and the like is abnormal G by the high G sensor 70. Immediately after detection,
The output recording of the high G sensor 70 and the output recording of the low G sensor 70 are stopped 15 seconds after that.

Here, the abnormal G is output from the high G sensor 70 after a collision has occurred in the vehicle and after a delay time due to vehicle deformation has elapsed. , 3 seconds before the abnormal G is output from the high G sensor 70
The record for 15 seconds after is kept, and the behavior before and after the collision is surely kept.

Note that the output recording of the on-vehicle sensor such as the low G sensor 71 is synchronized with the recording end timing of the high G sensor 70 in this mode because the timing of the collision is specified and then 15 seconds. Also, if the vehicle behavior is recorded, a record sufficiently sufficient for behavior analysis can be obtained in practice, so that the timing is synchronized for the convenience of control.

As for the record for detecting the lighting condition, it is sufficient if there is a record at the time when a collision occurs in the vehicle. Therefore, the record should be stopped when the abnormal G is output from the high G sensor 70. It is what

On the other hand, if it is determined in step 120 that the touch sensors 72 to 76 are outputting the output indicating a vehicle collision, the process proceeds from step 400 to step 410, as shown in FIG. Recording is held in the mode shown in (L). That is, in this mode, when the touch sensors 72 to 76 generate a trigger indicating a vehicle collision, the output recording of the light sensor 54 and the like is immediately thereafter, and the output recording of the high G sensor 70 and the low G sensor 71 is 18 seconds later, they are stopped.

When a collision is detected by the touch sensors 72 to 76, the abnormal G due to the collision is always detected by the high G sensor 70 after that, and when the effectiveness of the recorded contents is focused, the high G sensor is detected. This is because it is appropriate to allocate the entire memory for 70 to the recording after the trigger of the touch sensors 72 to 76 is generated.

Regarding the point that the recording of the low G sensor 71 and the like is stopped in synchronization with the high G sensor 70 and the point that the recording of the light sensor 54 and the like is ended at the same time as the trigger of the touch sensors 72 to 76, the above steps are performed. The reason is the same as in the case of 310.

As described above, the emergency state detecting section 24 of the drive recorder 12 detects whether a sudden change in behavior is detected in the vehicle, or when a collision is detected by the high G sensor 70.
In addition, when a collision is detected by the touch sensors 72 to 76, an appropriate mode is set for each to record and hold the vehicle data.

Therefore, when a vehicle collision occurs following a sudden change in vehicle behavior, the vehicle data after the sudden change in behavior can be recorded without omission, and if the eventual collision does not occur, the final Even when the collision cannot be detected by the touch sensors 72 to 76 and the high G sensor 70, the record can be retained.

Further, in the configuration in which an appropriate recording time is set according to each mode as in the present embodiment, it is possible to record the vehicle data in the memory section 18 without wasteful portions, and therefore the comparison is made. A sufficient amount of memory enables sufficient record retention. In this sense, the drive recorder 12 of this embodiment also has the effect of reducing the memory capacity of the memory section 18.

In this embodiment, the various sensors connected to the emergency state detecting section 24 and the signal processing section 26 correspond to the on-vehicle sensor M1 described above, and the memory section 18 corresponds to the recording means M2 described above. Sensor 70 and touch sensor 72
~ 76 based on the output value of
Is executed, the collision detection means M3 described above is executed.
However, by executing the steps 100 and 110 based on the output values of the wheel speed sensor 38 and the steering sensor 44, the behavior sudden change detection means M4 described above and the steps 210, 310 and 410 described above are executed. Thus, the above-mentioned record holding control means M5 is realized.

In this case, in this embodiment,
The above-described sudden behavior change detection means M4 is realized by determining the operating state of the ABS and the presence / absence of sudden steering. However, the object of sudden behavior change detection is not limited to these, and for example, low G
The presence or absence of sudden braking is detected by the sensor 71 or the like, or the degree of spin state is detected by the yaw rate sensor 40,
The configuration may be such that a sudden change in vehicle behavior is determined based on the detection result.

By the way, the collision possibility determination routine shown in FIG. 4 is configured to retain vehicle data for a predetermined period regardless of whether or not the vehicle subsequently collides when the vehicle behavior changes suddenly. Drive recorder 1 of the embodiment
Reference numeral 2 includes the recording stop release switch 84 as described above.

Therefore, when the vehicle behavior is suddenly changed, but there is no subsequent collision, and there is no need to analyze the cause of the sudden change in the vehicle behavior, the driver operates the recording stop release switch 84 again. Can be recorded. In this case, since the originally unnecessary vehicle information is recorded and held, it is possible to solve the problem that the vehicle data cannot be recorded under the situation where the vehicle data should be truly recorded.

In this case, after the sudden change of the vehicle, the driver confirms whether or not a true collision has occurred, and whether or not the record should be held via the recording stop release switch 84 according to the confirmation state. In this sense, the recording stop release switch 84 corresponds to the contact confirmation means M6 described above.

Further, the release of the recording stop can be carried out as a part of the recording holding control in the behavior abrupt change mode based on the output signals of the touch sensors 72 to 76 and the like.

FIG. 8 shows a flow chart of a collision possibility judgment routine configured to realize such a function. In step 220, after step 210, the presence or absence of contact is confirmed, and when the contact is not confirmed. The routine is the same as the routine shown in FIG. 4 except that step 230 for performing the process of permitting re-recording is added.

Specifically, after executing the record holding control in the sudden behavior change mode in step 210, collision detection by the touch sensors 72 to 76 or high G within a predetermined time.
It is monitored whether or not a collision is detected by the sensor 70, and if the collision is detected, the record is kept as it is and the processing is terminated. If the collision is not detected, the write controller 30 is allowed to re-record. This is a routine for issuing a command and ending the processing.

Therefore, when this routine is executed, it is not necessary for the driver to judge whether or not it should be canceled, and when it is not necessary to clearly keep the record, the memory section 18 is automatically re-recorded. Since the recording is permitted, it is possible to enjoy an effect that it is possible to prevent the useless data from being held, and to eliminate a later inoperability due to a driver forgetting to release the data.

[0091]

As described above, according to the first aspect of the present invention, the record of the vehicle data is held even when the vehicle behavior suddenly changes in addition to the case where the collision is detected in the vehicle. Therefore, when a sudden change in behavior occurs prior to a vehicle collision, vehicle data in the process leading to a collision after a sudden change in behavior is reliably recorded.

Further, in the case where the behavior is suddenly changed prior to the collision as described above, the record is retained in the sudden behavior change mode. Therefore, the record retention in the collision mode is mainly performed to record the vehicle data after the collision. Is enough. In this sense, when the behavior does not suddenly change prior to the collision, useless vehicle data before the collision is not recorded and held, and sufficient recording can be realized even if the memory capacity of the recording unit is relatively small.

Further, according to the vehicle data recording apparatus of the present invention, when the vehicle behavior suddenly changes and the eventual collision does not occur thereafter, or even when the collision is not detected, it is necessary. Since the vehicle data after the behavior change is retained, the vehicle record can be retained more reliably.

On the other hand, according to the second aspect of the present invention, if the vehicle behavior changes suddenly and the contact between the vehicle and another object is not confirmed thereafter, the record holding of the vehicle data after the behavior change is released. It Therefore, according to the vehicle data recording device of the present invention, even if the vehicle data once held is determined to be unnecessary after the behavior of the vehicle changes suddenly, the vehicle data is erased thereafter. Therefore, it is possible to prevent the capacity of the recording means from being pressed due to the holding of unnecessary recording in the behavior analysis.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of a vehicle data recording device according to the present invention.

FIG. 2 is a block configuration diagram of a drive recorder that is an embodiment of the present invention.

FIG. 3 is a vehicle mounting diagram of the drive recorder of the present embodiment.

FIG. 4 is a flowchart of an example of a collision possibility determination routine executed in this embodiment.

FIG. 5 is a flowchart of an example of an ABS operation determination routine executed in this embodiment.

FIG. 6 is a flowchart of an example of a sudden steering determination routine executed in this embodiment.

FIG. 7 is a diagram for explaining the operation of the drive recorder of the present embodiment.

FIG. 8 is a flowchart of another example of the collision possibility determination routine executed in this embodiment.

[Explanation of symbols]

 M1 vehicle-mounted sensor M2 recording means M3 collision detection means M4 sudden behavior change detection means M5 record retention control means M6 contact confirmation means 10 vehicle 12 drive recorder 24 emergency state detection section 26 signal processing section 30 writing control section 38 wheel speed sensor 40 yaw rate sensor 44 Steering sensor 54 Light sensor 70 High G sensor 71 Low G sensor 72 Bumper switch 74 Hood switch 76 Contact sensor 84 Recording stop release switch

Claims (2)

[Claims] 1. Vehicle data comprising recording means for recording outputs of various on-vehicle sensors mounted on the vehicle and collision detection means for detecting collision of the vehicle, and recording and holding the on-vehicle sensor outputs before and after the collision of the vehicle. In the recording device, when a vehicle collision is detected by the behavior sudden change detection means for detecting a sudden change in vehicle behavior, and a vehicle collision is detected by the collision detection means, an output record is made in a predetermined period before and after the collision of the vehicle behavior sensor among the onboard sensors. In order to hold the record, the record holding control is performed in the collision mode, and when a sudden change in the vehicle behavior is detected by the behavior sudden change detecting means, the output record of the sensor related to the vehicle behavior among the on-vehicle sensors is held for a predetermined period after the behavior sudden change. A data recording device for a vehicle, comprising: a record holding control means for performing a record holding control in a behavior sudden change mode. 2. The vehicle data recording device according to claim 1, further comprising contact confirmation means for transmitting a contact confirmation signal to the record holding control means when the contact between the vehicle and another object is confirmed. If the contact confirmation signal is not received after execution of the record holding control in the behavior sudden change mode, the record holding control means releases the record holding state of the vehicle behavior recorded in the behavior sudden change mode. Vehicle data recording device.