JP5543697B2 - Recording target information storage device - Google Patents

Description

  The present invention includes a recording target information collecting unit that collects predetermined recording target information, a volatile first storage unit that stores recording target information collected by the recording target information collection unit, and the first storage unit. And a second storage means that is stored when the recording target information stored therein satisfies a predetermined condition that is determined in advance.

  As described in Patent Document 1, the operation storage device that records the operation status of the vehicle is stored in the first storage device that always stores the operation status and in the first storage device when the vehicle satisfies a predetermined condition. In storing the information in the non-volatile second storage means, the information stored in the first storage means is stored in the secondary storage means in the event that the second storage means cannot be stored. . This is because the information stored in the secondary storage means is transferred to the second storage means in the unlikely event that it can be written to the second storage means again, and the information may be lost under certain conditions. I was trying not to.

Since the first storage means requires high speed and frequent writing, a volatile memory such as SDRAM (synchronous dynamic random access memory) is used, and the second storage means and the sub storage means are the first storage. Low-priced memories such as flash memories are used because they do not require high-speed and frequent writing unlike the means.
JP 2008-65454 A

  However, since the operation storage device described above has a standby power supply for enabling the information stored in the second storage means or the secondary storage means to be transferred even in the event of a power failure, when the predetermined condition is satisfied In addition, it is necessary to determine whether the second storage means is writable and to transfer information to the secondary storage means when writing is impossible. Such a problem is not limited to the drive recorder, and is a problem that similarly occurs in various recording target information storage devices such as a digital tachograph and an acceleration storage device.

  Therefore, in view of the above-described problems, an object of the present invention is to provide a recording target information storage device that can save power when holding recording target information stored when the power of the device is turned off. .

In order to solve the above-mentioned problems, the recording object information storage device according to claim 1 according to the present invention comprises a recording object information collecting means 11a for collecting predetermined recording object information as shown in the basic configuration diagram of FIG. A volatile first storage unit 13 for storing the recording target information collected by the recording target information collecting unit 11a, and a detachable recording medium, and the first unit when a predetermined predetermined condition is satisfied. In the recording target information storage device 1 having the second storage means C for storing the recording target information stored in the storage means 13, the recording target information collected by the recording target information collection means 11a is stored in the first storage. Third storage means 14 that is stored together with the first storage means and the second storage means, and the third storage means 14 retains the stored contents when the apparatus is powered off. A spare power supply 19 for supplying only the power required for the third storage means 14 for that, and having a.

  According to the recording target information storage device of the present invention described in claim 1, when the recording target information is collected by the recording target information collecting unit 11a, the recording target information is stored in the first storage unit 13. It is stored in the third storage means 14. Then, when the predetermined condition is satisfied and the storage of the information to be recorded in the first storage means 13 fails and the apparatus is turned off, the third storage means 14 records with the power from the standby power supply 19. Keep the target information.

  In the recording object information storage device according to claim 1, the recording object from the first storage unit 13 to the second storage unit C as shown in the basic configuration diagram of FIG. An end information storage control unit 11b for performing control for storing the end information indicating whether the information storage has been normally ended or abnormally ended in the third storage unit 14 and the third storage unit 14 are stored. An abnormal-time storage control unit 11c for performing control to store the recording target information stored in the third storage unit 14 in the second storage unit C when abnormal termination is set in the end information. It is characterized by that.

  According to the recording target information storage device of the present invention described in claim 2, the end information indicating that the recording target information indicates the storage result from the first storage means 13 to the second storage means C is the end information storage control means 11b. Is stored in the third storage means 14. Then, when the abnormal end is set in the end information stored in the third storage unit 14 at the time of starting or resetting the apparatus, the recording target information stored in the third storage unit 14 is stored in the abnormal state. It is stored in the second storage means C by the control means 11c.

  According to the third aspect of the present invention, as shown in the basic configuration diagram of FIG. 1, in the recording target information storage device according to the first or second aspect, the third storage unit 14 is different from the first storage unit 13. It is characterized by different volatile memories.

  According to the recording target information storage device of the present invention described in claim 3, a volatile memory different from the first storage unit 13 can be used for the third storage unit 14.

  According to a fourth aspect of the present invention, as shown in the basic configuration diagram of FIG. 1, in the recording target information storage device according to any one of the first to third aspects, the second storage means C And a removable storage medium.

  According to the recording target information storage device of the present invention described in claim 4, even if the recording target information cannot be stored in the second storage unit C in a state where the second storage unit C is detached, the recording target information is recorded. The target information can be stored in the third storage means.

  As described above, according to the recording target information storage device of the first aspect of the present invention, the collected recording target information is stored in both the first storage unit and the third storage unit, and the predetermined condition is satisfied. 2 After the storage in the storage means is completed, processing such as transfer of information to be recorded becomes unnecessary, and the third storage means retains the stored contents only with the power from the standby power supply. Since the power can be reduced, the capacity of the standby power supply can be reduced. Therefore, it is possible to store information to be recorded until a predetermined condition is satisfied without mounting a large capacity battery or the like in the apparatus.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the storage result of the recording target information from the first storage means to the second storage means is stored in the third storage means as the end information. If the end information indicates an abnormal end at the time of startup or the like, the recording target information stored in the third storage means is stored in the second storage means. Even if a power interruption or the like occurs during storage, the information to be recorded can be reliably recovered and stored in the second storage means. Therefore, even if a storage abnormality relating to the second storage unit occurs, work such as removing the recording target information storage device itself is not necessary, so that maintainability can be improved.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, only the third memory means is a non-volatile memory, so that the volatile memory is used only for the first memory means. Therefore, the cost can be reduced as compared with the case where both use volatile memories.

  According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, even when the power of the device is cut off with the second storage means removed, Since the recording target information is stored in the third storage means, loss of the recording target information can be prevented.

  The best mode when the recording target information storage device 1 shown in FIG. 1 according to the present invention is applied to a drive recorder will be described below with reference to the drawings of FIGS.

  In FIG. 2, the drive recorder 10 is mounted on a vehicle such as a freight truck, a taxi, or a passenger car so as not to obstruct the driver's view. The drive recorder 10 stores a central processing unit (CPU) 11 that performs various processes and controls according to a predetermined program, a ROM 12 that is a read-only memory storing a program for the CPU 11, and various data. In addition, an SDRAM (Synchronous DRAM) 13 which is an readable and writable volatile memory having an area necessary for processing operations of the CPU 11, and an SRAM (nonvolatile memory capable of holding stored contents even when the apparatus main body is powered off) Static Random Access Memory) 14 and the like.

  The above-described ROM 12 causes the CPU 11 (computer) to function as various means such as the recording target information collecting unit 11a, the end information storage control unit 11b, and the abnormal time storage control unit 11c shown in FIG. The various programs are memorized.

  The SDRAM 13 corresponds to the first storage means shown in FIG. 1 according to the claims, and is a semiconductor memory whose stored contents are lost when the power (not shown) of the drive recorder 10 is turned off. Used for. The SDRAM 13 has a storage capacity sufficient to store the recording target information collected during traveling of the vehicle or during operation.

  The SRAM 14 is a semiconductor memory that can retain stored contents even when the power is turned off, and a flash memory or the like is arbitrarily used. In the SRAM 14, the same recording target information as the recording target information stored in the SDRAM 13 is stored in synchronization. That is, the same recording target information is stored in the SDRAM 13 and the RAM 14. However, due to the storage capacity, only a part of the information to be recorded may be recorded in the SRAM 14 as the preliminary storage means.

  The SRAM 14 has an area for storing recording target information and end information. Since the recording target information is the drive recorder 10, for example, the recording target information includes data indicating vehicle conditions such as front and rear images before and after the accident, vehicle speed, and sudden acceleration / deceleration. The data structure of the recording target information is arbitrarily determined according to the type and specification of the apparatus, the recording purpose, and the like. The end information includes data indicating whether the storage of the recording target information on the card C is a normal end or an abnormal end.

  The drive recorder 10 further includes a camera 15, an acceleration sensor 16, and a card insertion unit 17. The camera 15 is electrically connected to the CPU 11 via an interface circuit (I / F) 15i.

  As the camera 15, various cameras such as a CCD (Charge Coupled Device) camera, a digital camera, a video camera, and an infrared camera can be arbitrarily used. The camera 15 always captures a front image of the vehicle, and the captured image signal is converted and compressed by the interface circuit 15i and input to the CPU 11 as imaging information. The imaging information is arbitrarily determined according to the configuration, specifications, etc. of the drive recorder 2 such as moving images and still images.

  Further, in the best mode, the case where the camera 15 is provided inside the housing so as to capture the front of the vehicle will be described, but the present invention is not limited to this, for example, the rear of the vehicle, A plurality of cameras using cameras preinstalled in the vehicle, provided in any location of the vehicle so as to image the periphery, the driver of the vehicle, the driver of the business vehicle, the passenger, the inside of the vehicle, the door for getting on and off, etc. Various embodiments can be made, such as using. Then, by arranging the plurality of cameras 15 at desired locations in the vehicle, it is possible to collect imaging information that can contribute to the cause analysis of the impact.

  The acceleration sensor 16 uses a triaxial acceleration sensor that detects acceleration, tilt, impact, etc. in the triaxial (X, Y, Z) directions. As is well known, the triaxial acceleration sensor supports a weight by a thin silicon beam (beam), the weight is moved by acceleration, the beam is distorted, and this distortion is applied to a piezoresistive element or the like formed on the beam. The acceleration is detected by resistance change. The acceleration sensor 16 is electrically connected to the CPU 11 and outputs an acceleration signal indicating the detected acceleration to the CPU 11. The acceleration sensor 16 is preferably capable of detecting acceleration in a direction orthogonal to the traveling direction of the vehicle and the traveling direction.

  In the best mode, the acceleration sensor 16 is provided corresponding to the camera 15 described above, and the acceleration sensor 16a is provided inside the housing. However, one or a plurality of accelerations are provided at the measurement point of the vehicle. Various embodiments such as arranging the sensor 16 can be employed.

  The card insertion unit 17 writes and reads various data designated by the CPU 11 with respect to the loaded card C. The card C is manually inserted into the insertion unit 17 and the card C is discharged. A discharge mechanism (not shown) in the card insertion portion 17 is automatically performed according to the operation of the key.

  The card C corresponds to the second storage means described in the claims shown in FIG. 1, and uses a card-like recording medium such as a removable memory card for the card insertion portion 17 of the drive recorder 10 such as Compact Flash. ing. As is well known, the card C has a memory whose stored contents do not disappear even if it is not energized, and a controller circuit that handles input and output with the outside. For the card C, various types of memory cards and the like can be used depending on the specifications of the drive recorder 10 and the like. The card C inserted into the card insertion unit 17 is stored by writing the recording target information by the card insertion unit 17 when a predetermined condition is satisfied.

  The drive recorder 10 further includes an interface unit 18, and the interface unit 18 is electrically connected to the CPU 11. The interface unit 18 is connected with a vehicle speed sensor 3 and an ignition (IGN) switch (not shown). A speed signal corresponding to the vehicle speed output from the speed sensor 31 is input to the CPU 11. . And this speed signal is detected and memorize | stored by CPU11 as one item in vehicle condition information. Depending on the configuration content of the recording target information stored in the card C, various signals such as a vehicle brake, left and right turn, and rudder angle can be input from the vehicle to the CPU 11 via the interface unit 18.

  The drive recorder 10 further has a standby power source 19. The backup power source 19 uses a backup battery, a capacitor, or the like, and is electrically connected to the SRAM 14. The standby power supply 19 is configured to supply only power to the SRAM 14 that is necessary for the SRAM 14 to retain the stored contents for a predetermined time when the drive recorder 10 is powered off.

  Next, an example of a processing outline according to the present invention executed by the CPU 11 of the drive recorder 10 will be described with reference to a flowchart of FIG.

  In step S1, it is determined whether or not an ignition (IGN) switch of the vehicle has been turned ON by supplying power. When it is determined that the IGN switch is not turned on (N in S1), this determination process is repeated to wait for the IGN switch to be turned on. On the other hand, when it is determined that the IGN switch is turned on (Y in S1), the process proceeds to step S2.

  In step S <b> 2, it is determined whether or not the card insertion unit 17 can write information to the card C (for example, whether or not the card C is attached, storage capacity, etc.). If it is determined that writing is not possible (N in S2), the process returns to step S1 and a series of processes is repeated. On the other hand, if it is determined that writing is possible (Y in S2), the process proceeds to step S3.

  In step S <b> 3, it is determined whether or not normal termination is set in the termination information stored in the SRAM 14. When it is determined that the process is normally completed (Y in S3), the process proceeds to step S6. On the other hand, if it is determined that the normal termination has not been completed (N in S3), the card insertion unit 17 requests the card insertion unit 17 to write the recording target information stored in the SRAM 14 in step S4, whereby the card C In step S5, recording to the card C is terminated by a completion notification from the card insertion unit 17, and then the process proceeds to step S6.

  In step S6, when the initial process is executed, predetermined initial values are set in various areas such as the SDRAM 13 and the SRAM 14. As a result, "abnormal end" is set as the initial value in the end information of the SRAM 14, and thereafter Proceed to step S7.

  In step S7, imaging information obtained by imaging the front of the vehicle or the like is acquired from the camera 15, and in step S8, the acceleration signal input from the acceleration sensor 16 is converted into acceleration, inclination, and inclination in three axes (X, Y, Z) directions. Acceleration information indicating an impact or the like is acquired. In step S9, the acquired imaging information and acceleration information are stored as recording target information in the SDRAM 13, stored in the SRAM 14 as recording target information in step S10, and then in step S11. move on.

  In step S11, based on the acceleration information of the SDRAM 13, it is determined whether or not the acceleration in the front-rear direction or the left-right (vehicle width) direction of the vehicle exceeds a recording trigger level that is a predetermined condition. If it is determined that the recording trigger level has not been exceeded (N in S11), the process returns to step S7, and a series of processing is repeated. On the other hand, when it is determined that the recording trigger level is exceeded (Y in S11), it is determined that the predetermined condition is satisfied, and the process proceeds to step S12.

  In step S12, it is determined whether or not the card insertion unit 17 can write information to the card C. If it is determined that writing to the card C is possible (Y in S12), the card insertion unit 17 is requested to write the recording target information stored in the SDRAM 13 to the card C in step S13. In step S14, the recording on the card C is terminated by a completion notification from the card insertion unit 17, and then the process proceeds to step S15.

  In step S15, it is determined whether or not the IGN switch is OFF. If it is determined that the IGN switch is not OFF (N in S15), the process returns to step S7, and a series of processes is repeated. On the other hand, when it is determined that the IGN switch is OFF (Y in S15), data indicating normal termination is set in the termination information of the SRAM 14 in step S16, termination processing is executed in step S17, and the subsequent processing is performed. finish.

  If it is determined in step S12 that writing to the card C is impossible (N in S12), the storage is stopped in step S18 if the recording target information is being stored in the SRAM 14, and the recording is stopped in step S19. Is set in the SRAM 14 end information. In step S20, an error warning is issued by requesting an error output to a display unit or output unit (not shown). In step S21, the IGN switch is turned on. After waiting for OFF, the processing is terminated in response to detection of the OFF.

  As described above, the CPU 11 executes the processing program shown in FIG. 3, so that the CPU 11 records information collection means 11a, end information storage control means 11b, and abnormal storage control means in the claims shown in FIG. It will function as 11c. In FIG. 3, steps S7 to S8 correspond to the recording information collecting unit 11a, steps S16 and S19 correspond to the end information storage control unit 11b, and steps S4 to S5 correspond to the abnormal time storage control unit 11c, respectively.

  Next, an example of the operation (action) of the drive recorder 10 configured as described above will be described below with reference to the drawing of FIG.

  In FIG. 4, the drive recorder 10 is activated in response to power supply, and after that, when the IGN switch is turned on and writing to the card C is possible, the drive recorder 10 confirms the end information D2 of the SRAM 14. When the normal end is set in the end information D2, the drive recorder 10 collects the imaging information and acceleration information as the recording target information D1, and stores these information as the recording target information D1 in both the SDRAM 13 and the SRAM 14. (Process P1). When acceleration exceeding the recording trigger level is detected from the acceleration information of the recording target information D1, it is determined that the predetermined condition is satisfied, and the storage target information D1 of the SDRAM 13 is stored in the card C (step P2).

  When the storage of the recording target information D1 on the card C is normally completed, the drive recorder 10 sets the result in the termination information D2 of the SRAM 14. Further, when the storage of the recording target information D1 in the card C is abnormally ended, the drive recorder 10 sets the result in the end information D2 of the SRAM 14, and the recording target information stored in the SRAM 14 by the power of the standby power source 19 D1 is held.

  If abnormal termination is set in the termination information D2 of the SRAM 14 due to restart or the like, the drive recorder 10 determines that the recording target information D1 is held in the SRAM 14 due to the failure of the recording target information D1 on the card C. Then, the recording target information D1 is transferred from the SRAM 14 to the card C and stored (process P3).

  According to the drive recorder 10 described above, the collected recording target information D1 is stored in both the SDRAM (first storage unit) 13 and the SRAM (third storage unit) 14, and the card (second storage) satisfies a predetermined condition. Means) After the storage in C is completed, the processing such as the transfer of the recording target information D1 becomes unnecessary, and the SRAM 14 holds the stored contents only with the power from the standby power supply 19, so that the power consumption when the power is cut off, etc. Therefore, the capacity of the standby power source 19 can be reduced. Therefore, the recording target information D1 before satisfying the predetermined condition can be stored in the SRAM 14 without mounting the large capacity spare battery 19 or the like in the drive recorder 10.

  The storage result of the recording target information D1 from the SDRAM 13 to the SRAM 14 is stored in the SRAM 14 as the end information D2. If the end information D2 indicates an abnormal end at the time of startup or the like, the recording target information stored in the SRAM 14 Since D1 is stored in the card C, the recording target information D1 can be reliably recovered and stored in the card C even if an abnormality of the card C, a power interruption during storage, or the like occurs. Therefore, even if a memory abnormality relating to the card C occurs, work such as removing the drive recorder 10 itself from the vehicle is not necessary, so that maintainability can be improved.

  In the above-described embodiment, the case where the recording target information storage device 1 shown in FIG. 1 is applied to the drive recorder 10 has been described. However, the recording target information storage device 1 is replaced with another device such as a digital tachograph or an acceleration storage device. It can also be applied to and incorporated into. The predetermined condition in the present invention is that the drive recorder 10 detects a recording trigger level acceleration, the digital tachograph detects a predetermined change in operation, and the acceleration storage device detects a recording trigger level acceleration. And so on.

  As described above, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a figure which shows the basic composition of the recording target information storage device which concerns on this invention. It is a block diagram which shows schematic structure of the drive recorder to which the recording target information storage device of this invention is applied. It is a flowchart which shows an example of the process outline | summary which concerns on this invention which CPU of FIG. 2 performs. It is a figure for demonstrating an example of the data flow of the recording target information in a drive recorder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording object information storage device 10 Drive recorder 11a Recording object information collection means (CPU)
11b End information storage control means (CPU)
11c Abnormal storage control means (CPU)
13 First storage means (SDRAM)
14 Third storage means (SRAM)
C Second storage means (card)

Claims (4)

A recording target information collecting unit for collecting predetermined recording target information, a volatile first storage unit for storing the recording target information collected by the recording target information collecting unit, and a removable recording medium, A recording target information storage device comprising: a second storage unit that stores the recording target information stored in the first storage unit when a predetermined condition is satisfied;
Third storage means different from the first storage means and the second storage means for storing the recording target information collected by the recording target information collection means together with the first storage means;
A standby power supply that supplies only the third storage means with the power necessary for the third storage means to retain the stored contents when the power in the apparatus is cut off;
A recording target information storage device characterized by comprising: End information storage control for controlling the third storage means to store end information indicating whether the storage of the recording target information from the first storage means to the second storage means has ended normally or abnormally. Means,
When an abnormal end is set in the end information stored in the third storage unit, the control is performed to store the recording target information stored in the third storage unit in the second storage unit. Memory control means;
The recording target information storage device according to claim 1, further comprising:   The recording target information storage device according to claim 1, wherein the third storage unit is a volatile memory different from the first storage unit.   The recording target information storage device according to claim 1, wherein the second storage unit is a storage medium removable from the device.

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