JP2019169066A - Operation information recording apparatus - Google Patents

Abstract

To provide an operation information recording apparatus capable of reducing the possibility that information regarding operation when power supply from a vehicle battery is cut off is lost.SOLUTION: An operation information recording apparatus 1 includes a volatile SRAM 12 and a nonvolatile FROM 13. The volatile SRAM 12 sequentially records information about the operation of a vehicle. The nonvolatile FROM 13 has an operation information recording section 13b in which a predetermined amount of information is recorded when information about the operation recorded by the SRAM 12 reaches the predetermined amount. Further, when the power supply from a vehicle battery is detected to be interrupted, the operation information recording apparatus 1 executes a retraction processing for recording the information on the operation recorded by the volatile SRAM 12 on a save information recording unit 13c provided in the nonvolatile FROM 13 by using the power of a first auxiliary power supply 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an operation information recording apparatus.

  Conventionally, an operation information recording device such as a digital tachograph that is mounted on a vehicle and records information such as a vehicle speed, a travel distance, and time has been proposed (for example, see Patent Documents 1 and 2). In such an operation information recording device, information related to operation is recorded in, for example, an SRAM (Static Random Access Memory) which is a volatile memory. In the operation information recording device, an auxiliary power source is connected to the SRAM, and when the power supply from the vehicle battery is cut off, the recorded contents in the SRAM are recorded for a predetermined time (for example, 24 hours) using the power of the auxiliary power source. It is designed to be held over the entire area.

JP 2009-266260 A JP 2013-140485 A

  However, although the operation information recording apparatus as shown in Patent Documents 1 and 2 can hold the recorded contents for a predetermined time by the auxiliary power source, information on the operation is lost when the auxiliary power source is completely discharged. .

  The present invention has been made in order to solve such a problem, and the object of the present invention is to reduce the possibility of losing information on operation when power supply from the vehicle battery is cut off. It is in providing the operation information recording device which can do.

  The operation information recording apparatus according to the present invention includes a volatile first storage unit and a nonvolatile second storage unit. The volatile first storage means sequentially records information related to vehicle operation. The non-volatile second storage means has an operation information recording area where the predetermined amount of information is recorded when the information related to the operation recorded by the first storage means reaches a predetermined amount. Furthermore, the operation information recording device uses the power of the auxiliary power source to detect information related to the operation recorded by the volatile first storage means when it is detected that the power supply from the vehicle battery has been cut off. Then, a save process for recording in a save area provided in the nonvolatile second storage means is executed.

  According to the present invention, when it is detected that the power supply from the vehicle battery has been cut off, the information on the operation recorded by the volatile first storage means is stored in a non-volatile manner using the power of the auxiliary power source. Evacuation processing to be recorded in the evacuation area provided in the second storage means is executed. For this reason, the information on the operation recorded by the volatile first storage means does not reach the predetermined amount and is not the recording timing to the non-volatile second storage means. It is saved in the storage means. Therefore, it is possible to reduce the possibility that the information related to the operation when the power supply from the vehicle battery is cut off is lost.

It is a block diagram which shows the operation information recording device which concerns on embodiment of this invention. It is a 1st conceptual diagram which shows the outline of operation | movement of the operation information recording apparatus which concerns on this embodiment. It is a 2nd conceptual diagram which shows the outline of operation | movement of the operation information recording apparatus which concerns on this embodiment. It is a 1st flowchart which shows the information relief method of the operation information recording device which concerns on this embodiment. It is a 2nd flowchart which shows the information relief method of the operation information recording device which concerns on this embodiment.

  Hereinafter, the present invention will be described according to preferred embodiments. Note that the present invention is not limited to the embodiments described below, and can be appropriately changed without departing from the spirit of the present invention. Further, in the embodiment described below, there is a part where illustration or description of a part of the configuration is omitted, but details of the omitted technology are within a range in which there is no contradiction with the contents described below. Needless to say, known or well-known techniques are applied as appropriate.

  FIG. 1 is a configuration diagram illustrating an operation information recording apparatus according to an embodiment of the present invention. As shown in FIG. 1, the operation information recording device 1 is mounted on a vehicle, and acquires and sequentially records information related to the operation of the vehicle (for example, information on the vehicle speed and engine speed). The information recorded in the operation information recording device 1 is acquired by a driving evaluation device such as a management office through a recording medium such as a memory card or wireless communication, and analyzed by the driving evaluation device.

  Such an operation information recording apparatus 1 includes a CPU (Central Processing Unit) 11, an SRAM (first storage means) 12, a FROM (flash memory: second storage means) 13, a first auxiliary power supply (auxiliary power supply) 14, a first 2 An auxiliary power supply 15, a speed I / F (Interface) 16, an engine I / F 17, a power supply I / F 18, and a recording medium connector 19 are provided. Further, the operation information recording apparatus 1 includes an LCD (Liquid Crystal Display) 20 and a buzzer 21.

  The CPU 11 controls each part of the operation information recording apparatus 1 in an integrated manner. The SRAM 12 is a volatile memory that sequentially records information related to operation. The SRAM 12 has a data processing unit 12a serving as a work area.

  The FROM 13 is a non-volatile memory in which the predetermined amount of information is recorded when the information related to the operation recorded in the SRAM 12 reaches a predetermined amount (for example, 1.4 kB). The FROM 13 includes a setting program storage unit 13a in which programs for the CPU 11 of the operation information recording device 1 to realize each function are recorded, and an operation information recording unit (operation information recording area) in which the predetermined amount of information is recorded. 13b. Further, the FROM 13 includes a save information recording unit (save area) 13c. The evacuation information recording unit 13c is configured to evacuate and record information regarding operation when power supply from the vehicle battery is cut off, as will be described later.

  The first auxiliary power supply 14 supplies power to each part of the operation information recording apparatus 1 when the power supply from the vehicle battery is cut off, and particularly ensures the operating power of the CPU 11. The first auxiliary power supply 14 is configured by, for example, a large-capacity capacitor, and the operation information recording apparatus 1 uses, for example, the power of the first auxiliary power supply 14 even when the power supply from the vehicle battery is cut off. It can operate for several tens of seconds.

  The second auxiliary power supply 15 supplies power to the SRAM 12, which is a volatile memory. The second auxiliary power supply 15 is constituted by, for example, a backup battery, and supplies power for the SRAM 12 to hold the recorded contents when the power supply from the vehicle battery is cut off. The SRAM 12 receives the power from the second auxiliary power supply 15, and thus retains the recorded contents for a predetermined time (for example, 24 hours) even when the power supply from the vehicle battery is cut off. .

  The speed I / F 16 is used to input a speed pulse from a vehicle speed sensor attached to the vehicle. The speed I / F 16 is connected to the CPU 11 and supplies the input speed pulse to the CPU 11. The CPU 11 inputs a speed pulse through the speed I / F 16 and grasps the speed of the host vehicle.

  The engine I / F 17 inputs engine pulses from an engine speed sensor attached to the vehicle. The engine I / F 17 is connected to the CPU 11 and supplies the input engine pulse to the CPU 11. The CPU 11 inputs an engine pulse through the engine I / F 17 and grasps the engine speed of the host vehicle.

  The power supply I / F 18 is an input unit that receives power supply from the vehicle battery. The recording medium connector 19 is a part into which a recording medium (for example, a memory card) owned by a driver who drives the vehicle (for example, a taxi or a crew member of a delivery company) is inserted. The operation information recording apparatus 1 according to the present embodiment has a memory card in the case where a memory card is inserted not only in the FROM 13 but also in the recording medium connector 19 when the information related to the operation recorded in the SRAM 12 reaches a predetermined amount. In addition, information on a predetermined amount of operation is recorded.

  The LCD 20 is a display unit for providing information to the driver through image display. The buzzer 21 is a voice warning unit that alerts the driver when it is determined that the driver is driving outside a predetermined safe driving condition.

  Here, the operation information recording apparatus 1 according to the present embodiment records the information in the operation information recording unit 13b of the FROM 13 every time the information regarding the operation in the SRAM 12 reaches a predetermined amount. In addition, since the operation information recording device 1 includes the second auxiliary power supply 15, even if the power supply from the vehicle battery is cut off, information on the operation that does not reach the predetermined amount recorded in the SRAM 12. Is held for a predetermined time. However, if a predetermined time elapses after the power supply from the vehicle battery is cut off, information related to the operation that does not reach the predetermined amount recorded in the SRAM 12 is lost. In particular, when the power supply from the vehicle battery is cut off due to a vehicle accident, information regarding the operation immediately before the accident (that is, information in the SRAM 12) is important, but this may be lost.

  Therefore, the operation information recording apparatus 1 according to the present embodiment includes a evacuation information recording unit 13c. Further, the CPU 11 includes a power interruption detection unit 11a and a recording control unit 11b.

  The power interruption detection unit 11a is a functional unit that detects that power supply from the vehicle battery has been cut off. The power interruption detection unit 11a determines whether or not the power supply from the vehicle battery has been cut off, for example, by monitoring the voltage state of the power supply I / F 18.

  The recording control unit 11b uses the power of the first auxiliary power supply 14 to record information about the operation recorded in the SRAM 12 when the power interruption detection unit 11a detects that the power supply from the vehicle battery is cut off. Is stored in the save information recording unit 13c provided in the FROM 13.

  Note that the recording control unit 11b is configured to perform the evacuation process if the evacuation process is set in advance even when the power interruption detection unit 11a detects that the power supply from the vehicle battery is cut off. Execution of is prohibited. As a result, for example, when the power supply is shut off between processes on the factory line, the restart time can be shortened by prohibiting the evacuation process, leading to an improvement in productivity.

  Furthermore, even if the recording control unit 11b detects that the power supply from the vehicle battery is cut off by the power interruption detection unit 11a, when the voltage of the first auxiliary power supply 14 is equal to or lower than the predetermined voltage, Prohibit execution of save processing. As a result, for example, if the first auxiliary power supply 14 has failed or deteriorated and sufficient power cannot be secured, and only a power supply that cannot be saved even if the save process is executed, execution of the save process is prohibited. Therefore, it is possible to prevent a situation where unnecessary processing is executed.

  Further, when the power supply from the vehicle battery is restored, more precisely, when the ignition switch (or accessory switch) is turned on after the power supply is restored, the recording control unit 11b stores the saved information recording unit 13c. Information on the recorded operation is recorded in the operation information recording unit 13b.

  More specifically, first, the CPU 11 has a determination unit 11c that determines whether or not the second auxiliary power supply 15 is in an empty state. The recording control unit 11b also determines that the second auxiliary power source 15 is empty by the determination unit 11c when the power supply is recovered after the power supply detection from the vehicle battery is detected by the power supply detection unit 11a. Determine if it was in a state. When the second auxiliary power supply 15 is in an empty state, it can be said that the power supply from the vehicle battery is cut off and the evacuation process is executed, and the information about the operation in the SRAM 12 is deleted. For this reason, the recording control unit 11b causes the operation information recording unit 13b to record information on the operation recorded in the save information recording unit 13c of the FROM 13 by the save process. At this time, the recording control unit 11b causes the operation information recording unit 13b of the FROM 13 to record information related to the operation recorded in the save information recording unit 13c via the SRAM 12.

  Note that the recording control unit 11b causes the operation information recording unit 13b to record the information related to the operation recorded in the save information recording unit 13c, and then deletes the information related to the operation recorded in the save information recording unit 13c.

  Next, with reference to FIG.2 and FIG.3, the outline | summary of operation | movement of the operation information recording apparatus 1 which concerns on this embodiment is demonstrated. FIG.2 and FIG.3 is a conceptual diagram which shows the outline of operation | movement of the operation information recording device 1 which concerns on this embodiment.

  First, as shown in FIG. 2, information on operation is sequentially recorded in the SRAM 12 (see ST1). When this information reaches a predetermined amount, the recording control unit 11b records information on the operation in the operation information recording unit 13b of the FROM 13 (see ST2). Here, when the memory card is inserted into the recording medium connector 19, information relating to the operation is also recorded in the memory card.

  After that, information on the operation is sequentially recorded in the SRAM 12 (see ST3). Then, it is assumed that the power supply from the vehicle battery is cut off when the information regarding the operation does not reach a predetermined amount (see SD). At this time, the recording control unit 11b executes a saving process for recording information on the operation in the saving information recording unit 13c of the FROM 13 (see ST4).

  Thereafter, since the operation information recording device 1 is operated by the power from the first auxiliary power supply 14, information related to the operation is sequentially recorded (see ST5). However, when the voltage of the first auxiliary power supply 14 becomes equal to or lower than the predetermined voltage, the operation information recording device 1 determines that there is no operating power, and stops recording information about the operation (see PS).

  Reference is now made to FIG. Assume that the power supply from the vehicle battery has recovered after the processing shown in FIG. In this case, the determination unit 11c determines whether or not the second auxiliary power supply 15 is in an empty state. When the second auxiliary power supply 15 is in an empty state, the recording control unit 11b is operated to be recorded in the retraction information recording unit 13c of the FROM 13. Is recorded in the SRAM 12 (see ST6).

  Next, the recording control unit 11b causes the operation information recording unit 13b of the FROM 13 to record information related to the operation recorded in the SRAM 12 (see ST7). After the information related to the operation is recorded in the operation information recording unit 13b of the FROM 13, the recording control unit 11b deletes the information related to the operation recorded in the retraction information recording unit 13c of the FROM 13 (see ST8).

  Next, an information relief method for the operation information recording apparatus 1 according to the present embodiment will be described. 4 and 5 are flowcharts showing an information relief method of the operation information recording apparatus 1 according to the present embodiment.

  First, as shown in FIG. 4, the power interruption detection unit 11a determines whether the power supply from the vehicle battery has been cut off (S1). When it is determined that the power supply from the vehicle battery has not been cut off by the power interruption detection unit 11a (S1: NO), this is continued until it is determined by the power interruption detection unit 11a that the power supply from the vehicle battery has been cut off. The process is repeated.

  On the other hand, when it is determined by the power interruption detection unit 11a that the power supply from the vehicle battery has been cut off (S1: YES), the recording control unit 11b determines whether the setting for prohibiting the evacuation process is made (S2). . If it is determined by the recording control unit 11b that the setting for prohibiting the saving process is made (S2: YES), the process proceeds to step S1.

  When the recording control unit 11b determines that the setting for prohibiting the saving process is not made (S2: NO), the recording control unit 11b determines whether the voltage of the first auxiliary power supply 14 is equal to or lower than a predetermined voltage (S3). When the recording controller 11b determines that the voltage of the first auxiliary power supply 14 is equal to or lower than the predetermined voltage (S3: YES), the process proceeds to step S1.

  On the other hand, when the recording control unit 11b determines that the voltage of the first auxiliary power supply 14 is not equal to or lower than the predetermined voltage (S3: NO), the recording control unit 11b executes a saving process (S4). Thereby, the information regarding the operation recorded in the SRAM 12 is recorded in the save information recording unit 13c of the FROM 13, and is maintained without disappearing even if the second auxiliary power supply 15 becomes empty, for example. Thereafter, the process proceeds to step S1.

  Next, a process executed when the ignition switch is turned on will be described with reference to FIG. First, when the ignition switch is turned on, the determination unit 11c determines whether the second auxiliary power supply 15 is in an empty state (S11).

  When it is determined by the determination unit 11c that the second auxiliary power supply 15 has been emptied (S11: YES), the recording control unit 11b determines that the evacuation process has been executed and records it in the evacuation information recording unit 13c. The information regarding the operation to be performed is recorded in the SRAM 12 (S12).

  Next, the recording control unit 11b causes the operation information recording unit 13b to record the information related to the operation recorded in step S12 (S13), and erases the information related to the operation recorded in the save information recording unit 13c (S14). ).

  Thereafter, the CPU 11 corrects the time because it is predicted that the time data has shifted due to the power supply from the vehicle battery being cut off (S15), and the process proceeds to step S11.

  By the way, when it is determined by the determination unit 11c that the second auxiliary power supply 15 is not in an empty state (S11: NO), the recording control unit 11b determines whether information related to the operation is recorded in the evacuation information recording unit 13c. Judgment is made (S16). When it is determined by the recording control unit 11b that no information regarding the operation is recorded in the evacuation information recording unit 13c (S16: NO), the process proceeds to step S11.

  On the other hand, if the recording control unit 11b determines that information related to the operation is recorded in the retreat information recording unit 13c (S16: YES), the information related to the operation recorded in the retreat information recording unit 13c is deleted (S17). ), The process proceeds to step S11. That is, when it is determined as “YES” in step S16, since the information regarding the operation is recorded in the SRAM 12, the information regarding the operation recorded in the evacuation information recording unit 13c may be deleted. To do.

  As described above, according to the operation information recording apparatus 1 according to the present embodiment, when it is detected that the power supply from the vehicle battery is cut off, the power of the first auxiliary power supply 14 is used to volatilize. Evacuation processing for recording information on the operation recorded by the sex SRAM 12 in the evacuation information recording unit 13c provided in the nonvolatile FROM 13 is executed. For this reason, the information related to the operation recorded by the volatile SRAM 12 does not reach a predetermined amount and is saved in the nonvolatile FROM 13 at the time of power interruption even if it is not the recording timing to the nonvolatile FROM 13. Therefore, it is possible to reduce the possibility that the information related to the operation when the power supply from the vehicle battery is cut off is lost.

  In addition, when the setting to prohibit the save process is set in advance, the execution of the save process is prohibited. For example, when the power is shut off between the processes on the factory line, the restart due to the prohibition of the save process Time can be shortened and productivity can be improved.

  In addition, when it is detected that the power supply from the vehicle battery has been cut off, the execution of the save process is prohibited when the voltage of the first auxiliary power supply 14 is equal to or lower than the predetermined voltage. When only a power supply that cannot be saved can be secured, it is possible to prevent a situation where a wasteful process is executed by prohibiting the execution of the save process.

  When it is determined that the power supply from the vehicle battery is cut off and the second auxiliary power supply 15 is in an empty state, the save information stored in the FROM 13 is saved by the save process. Information related to the operation recorded in the recording unit 13c is recorded in the operation information recording unit 13b. For this reason, information related to the operation that has been evacuated is recorded from the evacuation information recording unit 13c to the operation information recording unit 13b, which is an official recording area, so that, for example, there is a problem in reading information relating to the operation in a later driving evaluation device. It can be difficult to get out.

  In addition, after information related to the operation recorded in the evacuation information recording unit 13c is recorded in the operation information recording unit 13b, unnecessary information is deleted in order to delete the information related to the operation recorded in the evacuation information recording unit 13c. Unnecessary data can be prevented from being accumulated, and a situation where the save area becomes insufficient in the save process when the power is shut off can be prevented.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-described embodiments, and may be modified without departing from the spirit of the present invention, and may be appropriately changed within a possible range. These techniques may be combined.

  For example, in the above-described embodiment, information on the vehicle speed and the engine speed is exemplified as information relating to the operation. However, the information is not limited to the vehicle speed and the engine speed, but other information such as acceleration, intersection approach speed, turn signal timing, and the like. The image information acquired at the time of service may be sufficient.

  Further, the operation information recording apparatus 1 according to the present embodiment may include another volatile memory instead of the SRAM 12 or may include another non-volatile memory instead of the FROM 13.

1: Operation information recording device 11a: Power failure detection unit (power failure detection means)
11b: recording control unit (recording control means)
11c: determination unit (determination means)
12: SRAM (first storage means)
13: FROM (second storage means)
13b: Operation information recording part (operation information recording area)
13c: evacuation information recording part (evacuation area)
14: 1st auxiliary power supply (auxiliary power supply)
15: Second auxiliary power supply

Claims (5)

Volatile first storage means for sequentially recording information relating to vehicle operation;
A non-volatile second storage means having an operation information recording area in which the predetermined amount of information is recorded when the information about the operation recorded by the first storage means reaches a predetermined amount;
Power interruption detection means for detecting that power supply from the vehicle battery has been cut off,
An auxiliary power source for supplying power when power supply from the vehicle battery is cut off;
When it is detected that the power supply from the vehicle battery is cut off by the power interruption detection means, the information on the operation recorded by the first storage means is stored in the second storage using the power of the auxiliary power supply. Recording control means for executing a saving process for recording in a saving area provided in the storage means;
An operation information recording device comprising: The recording control means executes the evacuation process when the power interruption detection means detects that the power supply from the vehicle battery has been cut off and is set to prohibit the evacuation process in advance. The operation information recording device according to claim 1, wherein the operation information recording device is prohibited. The recording control means prohibits execution of the evacuation process when the power interruption detection means detects that the power supply from the vehicle battery has been cut off and the auxiliary power supply voltage is equal to or lower than a predetermined voltage. The operation information recording device according to any one of claims 1 and 2, wherein the operation information recording device is provided. A second auxiliary power supply for supplying power for the first storage means to hold the recorded content when the power supply from the vehicle battery is cut off;
Determining means for determining whether or not the second auxiliary power supply is empty;
The recording control means determines that the second auxiliary power source is in an empty state by the judgment means when the power supply is recovered after the power interruption detection means detects that the power supply from the vehicle battery is cut off. The information on the operation recorded in the evacuation area provided in the second storage means by the evacuation process is recorded in the operation information recording area when the evacuation process is determined. 4. The operation information recording device according to any one of 3 above. The recording control means deletes the information about the operation recorded in the evacuation area after the information about the operation recorded in the evacuation area is recorded in the operation information recording area. The operation information recording device described.

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