JP7155532B2 - Data recording device and data recording system - Google Patents

Description

The present disclosure relates to data recording devices and data recording systems.

2. Description of the Related Art Conventionally, a data recording device for recording data regarding a vehicle is known (see Patent Document 1). The data recording device includes a control section, a power supply for the control section, and a non-volatile memory. A control unit records data in a non-volatile memory.

JP-A-2007-4378

A predetermined time is required to record data in the nonvolatile memory. If a momentary power failure or the like occurs while the control unit is recording data in the nonvolatile memory, the data to be recorded is lost.
The present disclosure provides a data recording device and a data recording system capable of suppressing loss of data even when an instantaneous power failure or the like occurs while data is being recorded in a nonvolatile memory.

One aspect of the present disclosure is a data recording device mounted on a vehicle, the external recording device having a data acquisition unit that acquires data, a function of communicating with the data recording device, and a function of recording the data. a transmission unit that transmits the data acquired by the data acquisition unit; and a recording unit that records the data acquired by the data acquisition unit in a nonvolatile memory after the transmission unit transmits the data. It is a data recording device provided.

A data recording device, which is one aspect of the present disclosure, transmits data to an external recording device before recording the data in a non-volatile memory. The external recording device receives and records the transmitted data.
A data recording device according to one aspect of the present disclosure can later record data recorded in an external recording device in a nonvolatile memory even when data cannot be recorded in the nonvolatile memory. Therefore, the data recording device, which is one aspect of the present disclosure, can suppress loss of data even when an instantaneous power failure or the like occurs while data is being recorded in the nonvolatile memory.

1 is a block diagram showing the configuration of a data recording system 1; FIG. 3 is a block diagram showing a functional configuration of a control section 9; FIG. 4 is a flowchart showing data recording processing executed by the data recording device 3; 4 is a time chart of data recording processing; 4 is a flow chart showing data complementing processing executed by the data recording device 3. FIG. 3 is a block diagram showing a functional configuration of a control section 9; FIG. 4 is a flow chart showing data complementing processing executed by the data recording device 3. FIG.

Exemplary embodiments of the present disclosure are described with reference to the drawings.
<First Embodiment>
1. Configuration of Data Recording System 1 The configuration of the data recording system 1 will be described with reference to FIGS. 1 and 2. FIG. As shown in FIG. 1, the data recording system 1 includes a data recording device 3 and a center 5. As shown in FIG. Center 5 corresponds to an external recording device.

A data recording device 3 is mounted on a vehicle 7 . The data recording device 3 includes a control section 9 and a nonvolatile memory 11 . The control unit 9 is a microcomputer having a CPU 13, a RAM 15, and a ROM 17. Each function of the controller 9 is implemented by executing a program stored in the ROM 17 . Also, by executing this program, a method corresponding to the program is executed.

As shown in FIG. 2, the control section 9 includes a data acquisition unit 19, a transmission unit 21, a recording unit 23, an abnormal data detection unit 25, a corresponding data requesting unit 27, a corresponding data receiving unit 29, an abnormal and a data completion unit 31 . The method of realizing the function of each unit included in the control unit 9 is not limited to software, and some or all of the functions may be realized using one or more pieces of hardware. For example, when the above functions are realized by an electronic circuit that is hardware, the electronic circuit may be realized by a digital circuit, an analog circuit, or a combination thereof.

The nonvolatile memory 11 is a memory that can retain recorded data even when the power is turned off. Examples of the nonvolatile memory 11 include flash memory and data flash.
Vehicle 7 includes communication module 33 , power source 35 , and sensor 37 in addition to data recording device 3 . The communication module 33 can perform wireless communication with the center 5 according to commands from the data recording device 3 . A power source 35 is a power source for the data recording device 3 . The sensor 37 detects various state quantities of the vehicle 7 . The sensor 37 outputs a signal representing the detected state quantity to the data recording device 3 .

The center 5 is installed outside the vehicle 7 . The center 5 includes a control section 39 , a nonvolatile memory 41 and a communication module 43 . The controller 39 is a microcomputer. A control section 39 controls each section of the center 5 . Nonvolatile memory 41 has the same configuration as nonvolatile memory 11 . The communication module 43 can perform wireless communication with the data recording device 3 according to commands from the control unit 39 . With the above configuration, the center 5 has a function of communicating with the data recording device 3 and a function of recording failure information, which will be described later, in the non-volatile memory 41 .

2. Data Recording Processing Executed by Data Recording Device 3 Data recording processing executed by the data recording device 3 will be described with reference to FIGS. 3 and 4. FIG. This process is repeatedly executed at predetermined time intervals. In step 1 of FIG. 3, data acquisition unit 19 detects the signal of sensor 37 .

In step 2, the data acquisition unit 19 determines whether or not a failure has occurred in the vehicle 7 based on the signal detected in step 1 above. If it is determined that the vehicle 7 has failed, the process proceeds to step 3 . If it is determined that the vehicle 7 has not failed, this process ends.

In step 3, the data acquisition unit 19 creates and acquires failure information. Examples of failure information include diagnostic information. Diagnosis information includes, for example, a diagnosis code, freeze frame data, and the like.

At step 4 , the recording unit 23 records the failure information acquired at step 3 in the RAM 15 .
In step 5 , the transmission unit 21 transmits the failure information recorded in the RAM 15 in step 4 to the center 5 using the communication module 33 . Note that the center 5 uses the communication module 43 to receive the transmitted failure information. Also, the center 5 records the received failure information in the nonvolatile memory 41 .

In step 6, the transmission unit 21 determines whether or not the transmission of the failure information in step 5 was successful. If it is determined that the failure information has been successfully transmitted, the process proceeds to step 7 . If it is determined that the transmission of the failure information has failed, the process returns to step 5.

In step 7 , the recording unit 23 records the failure information recorded in the RAM 15 in step 4 in the nonvolatile memory 11 . The process of step 7 is executed after the process of step 5.
In step 8, the recording unit 23 determines whether or not the recording of the failure information in step 7 was successful. If it is determined that the recording of the failure information has succeeded, this process ends. If it is determined that recording of failure information has failed, the process returns to step 7 .

FIG. 4 shows a time chart of data recording processing. A time period T1 in FIG. ₄ is a time period during which the process of step 4 is executed. A time period T2 is a time period from the start of the process of step ₅ to the affirmative determination in step 6 above. A time period T3 is a time period from the start of the processing of step ₇ to the affirmative determination in step 8 above. Time period _T2 is significantly shorter _than time period T3.

3. Data Complementation Processing Executed by Data Recording Device 3 Data compensation processing executed by the data recording device 3 will be described with reference to FIG. The data complementing process is executed when the power supply 35 is momentarily interrupted and the data recording device 3 recovers thereafter.

In step 11 , the abnormal data detection unit 25 executes processing for detecting abnormal failure information (hereinafter referred to as abnormal data) from the failure information recorded in the nonvolatile memory 11 . Abnormal data is broken failure information.

At step 12, the abnormal data detection unit 25 determines whether or not there is abnormal data in the non-volatile memory 11 based on the result of the processing at step 11 above. If it is determined that there is abnormal data in the nonvolatile memory 11 , the process proceeds to step 13 . If it is determined that there is no abnormal data in the nonvolatile memory 11, this process ends.

In step 13 the corresponding data requesting unit 27 uses the communication module 33 to send a first request signal to the center 5 . The first request signal is a signal requesting transmission of failure information corresponding to the abnormal data detected in the process of step 11 (hereinafter referred to as correspondence information). Corresponding information is failure information transmitted to the center 5 immediately before the data recording device 3 records the abnormal data in the nonvolatile memory 11 . In step 7, there is a high possibility that an instantaneous interruption of the power supply 35 occurred while the recording unit 23 was recording the corresponding information in the nonvolatile memory 11, resulting in abnormal data.

Note that the center 5 uses the communication module 43 to receive the transmitted first request signal. Also, the center 5 reads the correspondence information from the non-volatile memory 41 and transmits it to the data recording device 3 using the communication module 43 . The corresponding information is the most recently recorded failure information among the failure information recorded in the nonvolatile memory 41 . This is because the data recording device 3 did not transmit the fault information after transmitting the correspondence information because the power supply 35 was interrupted immediately after the data recording device 3 transmitted the correspondence information.

At step 14 , the correspondence data receiving unit 29 uses the communication module 33 to receive the correspondence information. The correspondence information received is the one transmitted by the center 5 .
At step 15 , the abnormal data supplementing unit 31 records the corresponding information received at step 14 in the nonvolatile memory 11 . The abnormal data complementing unit 31 deletes abnormal data from the nonvolatile memory 11 .

4. Effects of Data Recording System 1 and Data Recording Apparatus 3 (1A) The data recording apparatus 3 records failure information in the nonvolatile memory 11 in step 7 described above. If the power supply 35 is interrupted while the failure information is being recorded in the nonvolatile memory 11, the accurate failure information cannot be recorded in the nonvolatile memory 11, resulting in abnormal data. Further, if the power supply 35 is interrupted immediately before starting to record the failure information in the nonvolatile memory 11 , the failure information cannot be recorded in the nonvolatile memory 11 .

The data recording device 3 transmits the failure data to the center 5 in step 5 before recording the failure information in the nonvolatile memory 11 . The center 5 receives the transmitted failure information and records it in the nonvolatile memory 41 .

Therefore, even if the data recording device 3 cannot record the correct failure information in the nonvolatile memory 11 in step 7, the failure information recorded in the nonvolatile memory 41 can be recorded in the nonvolatile memory 11 later. . Therefore, the data recording device 3 can prevent the failure information from being lost even if the power supply 35 is interrupted momentarily while the failure information is being recorded in the nonvolatile memory 11 .

(1B) The data recording device 3 detects abnormal data from the failure information recorded in the nonvolatile memory 11 . The data recording device 3 requests the center 5 to transmit the correspondence information. The center 5 transmits correspondence information to the data recording device 3 . The data recording device 3 receives the correspondence information transmitted by the center 5 and records it in the nonvolatile memory 11 . Therefore, the data recording device 3 can replace the abnormal data recorded in the nonvolatile memory 11 with corresponding information.

(1C) The data recording device 3 records vehicle failure information. Since the failure information is not information that occurs periodically, the loss of the failure information has a great impact. In other words, in the case of information that occurs periodically, even if one piece of information is lost, it may be compensated for by the immediately preceding information. ” is difficult to supplement. The data recording device 3 can suppress loss of failure information.
<Second embodiment>
1. Differences from First Embodiment Since the basic configuration of the second embodiment is the same as that of the first embodiment, the differences will be described below. Note that the same reference numerals as in the first embodiment indicate the same configurations, and refer to the preceding description.

In the second embodiment, as shown in FIG. 6, the controller 9 includes a data acquisition unit 19, a transmission unit 21, a recording unit 23, a data request unit 45, a data reception unit 47, and a missing data detection unit. 49 and a missing data complementing unit 51 .

2. Processing Executed by Data Recording Apparatus 3 In the second embodiment, the data recording apparatus 3 performs the same data recording processing as in the first embodiment. In the second embodiment, the data recording device 3 performs the following data complementing process. This data complementing process will be described with reference to FIG.

In step 21 the data request unit 45 uses the communication module 33 to send a second request signal to the center 5 . The second request signal is a signal requesting transmission of all failure information recorded in the nonvolatile memory 41 (hereinafter referred to as center-side all failure information).

Note that the center 5 uses the communication module 43 to receive the transmitted second request signal. Also, the center 5 reads the center-side total failure information from the non-volatile memory 41 and transmits it to the data recording device 3 using the communication module 43 .

At step 22 , the data receiving unit 47 uses the communication module 33 to receive the center side total failure information. The center side total failure information received is the one transmitted by the center 5 .
At step 23 , the missing data detection unit 49 compares the center side total failure information received at step 22 with all the failure information recorded in the nonvolatile memory 11 . Then, the missing data detection unit 49 executes a process of detecting failure information not recorded in the non-volatile memory 11 (hereinafter referred to as missing data) from all center side failure information.

In step 24, the missing data detection unit 49 determines whether or not there is missing data based on the result of the processing in step 23 above. If it is determined that there is missing data, the process proceeds to step 25 . If it is determined that there is no missing data, this process ends.

At step 25 , the missing data complementing unit 51 records the missing data in the nonvolatile memory 11 .
3. Effects of Data Recording System 1 and Data Recording Apparatus 3 According to the second embodiment described in detail above, the effects (1A) and (1C) of the first embodiment described above are obtained, and the following effects are obtained.

(2A) The data recording device 3 requests the center 5 to send the center side all failure information. The center 5 transmits the center side all failure information to the data recording device 3 . The data recording device 3 receives the center side total failure information. The data recording device 3 detects missing data that is not recorded in the nonvolatile memory 11 from the center side total failure information. The data recording device 3 records the detected missing data in the nonvolatile memory 11 . Therefore, the data recording device 3 can record missing data in the nonvolatile memory 11 . The missing data occurs when the failure information cannot be recorded in the nonvolatile memory 11 due to an instantaneous interruption of the power supply 35 or the like immediately before starting to record the failure information in the nonvolatile memory 11 .
<Other embodiments>
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made.

(1) The data recording device 3 may record data other than failure information. The data to be recorded may be data that occurs irregularly or data that occurs periodically.
(2) Failure information may be generated by a device other than the data recording device 3 . The data recording device 3 can acquire failure information from devices other than the data recording device 3 .

(3) Instead of the center 5, an external recording device having the same functions as the center 5 and mounted on the vehicle 7 may be used.
(4) The nonvolatile memory 11 may exist outside the data recording device 3 .

(5) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or a function possessed by one component may be realized by a plurality of components. . Also, a plurality of functions possessed by a plurality of components may be realized by a single component, or a function realized by a plurality of components may be realized by a single component. Also, part of the configuration of the above embodiment may be omitted. Moreover, at least part of the configuration of the above embodiment may be added or replaced with respect to the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording described in the claims are embodiments of the present disclosure.

(6) In addition to the above-described data recording device, a non-transitional system such as a system having the data recording device as a component, a program for making a computer function as a control unit of the data recording device, a semiconductor memory in which this program is recorded, etc. The present disclosure can also be implemented in various forms such as a physical recording medium, a data recording method, a data complementing method, and the like.

DESCRIPTION OF SYMBOLS 1... Data recording system 3... Data recording device 5... Center 7... Vehicle 9... Control part 11... Non-volatile memory 13... CPU 15... RAM 17... ROM 19... Data acquisition unit 21... Transmission unit 23 Recording unit 25 Abnormal data detection unit 27 Corresponding data requesting unit 29 Corresponding data receiving unit 31 Abnormal data complementing unit 33 Communication module 35 Power supply 37 Sensor 39 Control unit 41 Non-volatile memory 43 Communication module 45 Data request unit 47 Data reception unit 49 Missing data detection unit 51 Missing data complementing unit

Claims (4)

A data recording device mounted on a vehicle,
a data acquisition unit for acquiring data;
a transmission unit configured to transmit the data acquired by the data acquisition unit to an external recording device having a function of communicating with the data recording device and further having a function of recording the data;
a recording unit that records the data acquired by the data acquisition unit in a non-volatile memory after the transmission unit has transmitted the data;
an abnormal data detection unit that detects abnormal data among the data recorded in the nonvolatile memory;
a corresponding data request unit for requesting the external recording device to transmit the data corresponding to the abnormal data;
a corresponding data receiving unit for receiving the data transmitted by the external recording device;
an abnormal data compensating unit that records the data received by the corresponding data receiving unit in the nonvolatile memory;
with
The data recording device, wherein the data acquisition unit is configured to create and acquire the data based on a signal from a sensor provided in the vehicle, or to acquire the data from a device other than the data recording device. A data recording device mounted on a vehicle,
a data acquisition unit for acquiring data;
a transmission unit configured to transmit the data acquired by the data acquisition unit to an external recording device having a function of communicating with the data recording device and further having a function of recording the data;
a recording unit that records the data acquired by the data acquisition unit in a non-volatile memory after the transmission unit has transmitted the data;
a data request unit requesting transmission of the data to the external recording device;
a data receiving unit for receiving the data transmitted by the external recording device;
a missing data detection unit that detects missing data not recorded in the nonvolatile memory among the data received by the data receiving unit;
a missing data complementing unit that records the missing data in the nonvolatile memory;
with
The data recording device, wherein the data acquisition unit is configured to create and acquire the data based on a signal from a sensor provided in the vehicle, or to acquire the data from a device other than the data recording device. The data recording device according to claim 1 or 2,
The data recording device, wherein the data is failure information of the vehicle. a data recording device according to any one of claims 1 to 3;
the external recording device;
data recording system.

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