JP2009298331A - Vehicle condition recording system, vehicle condition recording device, and vehicle condition recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle condition recording system or the like capable of storing vehicle information data transmitted by another ECU until an ECU storing vehicle information data is started to operate. <P>SOLUTION: This vehicle condition recording system 100 for recording vehicle information data in a first vehicle information data storing means 17 comprises a detecting means 22 for detecting that the first vehicle information data storing means 17 can store vehicle information data, a second vehicle information data storing means 16 for storing the vehicle information data during a period ranging from a turning-on time of a power supply of the vehicle to a time in which the first vehicle information data storing means can store the vehicle information data, a transferring means 23 for transferring the vehicle information data stored in the second vehicle information data storing means during a period ranging from the turning-on time of the power supply of the vehicle to the time when the first vehicle information data storing means goes into the state capable of storing the vehicle information data to the first vehicle information data storing means, and a recording means 25 for writing the transferred vehicle information data to the first vehicle information data storing means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle state recording system, a vehicle state recording device, and a vehicle state recording method for recording vehicle information data transmitted from a diagnosis target device mounted on a vehicle.

Various electronic control units (ECUs) are mounted on highly electronic vehicles, and periodically transmitted from each ECU so that the state of the ECU can be analyzed when a malfunction or the like occurs. Data (hereinafter referred to as vehicle information data) is stored in a predetermined storage means. Since the stored vehicle information data can be read out by a diagnostic tool or the like, the cause of the malfunction or the like can be analyzed by a diagnostic program (see, for example, Patent Document 1). Patent Document 1 describes a vehicle diagnostic device that diagnoses vehicle information data without using a diagnostic tool by executing a diagnostic program on a vehicle.
Japanese Patent Laid-Open No. 2004-9878

  By the way, since the vehicle information data is continuously stored while the vehicle is running, the vehicle information data is overwritten from the oldest so that it can be stored in a finite storage means. However, the number of vehicle information data that is not associated with the increase in the number of ECUs mounted on the vehicle and the sophistication of control is also increasing, and vehicle information data for a certain period is stored for analysis of malfunctions and the like. Therefore, the storage means is required to have a relatively large storage capacity.

  As such a large-capacity storage means, the vehicle is equipped with road map information storage means for storing road map information used for navigation, and vehicle information data is stored in a part of the road map information storage means. There are many. However, storing the vehicle information data in the road map information storage means has the following problems.

  FIG. 10 is a diagram schematically showing a difference in activation time between each ECU and the navigation ECU. For example, when each ECU is activated when the ignition (IG) is turned on, there is a time lag between the time when the ECU and the navigation ECU are activated after the IG is turned on. In FIG. 10, the navigation ECU is activated after the ECU_A and ECU_B are activated. Here, since the road map information storage means can store the vehicle information data after the navigation ECU is activated, the vehicle information data transmitted by the ECU_A and the ECU_B before the navigation ECU is activated is not stored. For this reason, even if a malfunction occurs before the navigation ECU is activated, it becomes difficult to analyze the malfunction. Further, for example, when a malfunction such as misfire occurs at the time of starting the engine, vehicle information data at the time of starting the engine cannot be recorded.

  Since the navigation ECU tends to increase startup time such as OS (Operating System) and program reading time, vehicle information data not recorded is also increasing.

  As information similar to the vehicle information data, freeze frame data (FFD) stored in each ECU is known regardless of whether or not the navigation ECU is activated, but FFD is used only when a failure is detected (diagnostic). This is information stored in each ECU (only when a fault to which a code is given is detected). For this reason, the vehicle information data before the start of the navigation ECU cannot be recorded unless a specific problem occurs. In addition, even if a problem occurs, the FFD records only limited information, so there is a problem that it is often insufficient for analysis.

  In view of the above problems, the present invention provides a vehicle state recording system, a vehicle state recording device, and a vehicle state recording method capable of storing vehicle information data transmitted by another ECU before the ECU that stores the vehicle information data is activated. The purpose is to provide.

  In view of the above problems, the present invention provides a vehicle state recording system that records vehicle information data transmitted from a diagnosis target apparatus mounted on a vehicle in first vehicle information data storage means, wherein the first vehicle information data storage means is a vehicle. Detection means for detecting that information data can be stored, and vehicle information data from when the vehicle is powered on until the first vehicle information data storage means can store the vehicle information data The second vehicle information data storage unit and the second vehicle information data storage unit stored in the second vehicle information data storage unit from when the vehicle is turned on until the first vehicle information data storage unit can store the vehicle information data. Transfer means for transferring the vehicle information data to the first vehicle information data storage means, and the vehicle information data transferred by the transfer means to the first vehicle information data storage means And having a recording means burn them.

  Until the first vehicle information data storage means is activated, the second vehicle information data storage means stores the vehicle information data, so that another diagnostic target apparatus is activated before the apparatus for storing the vehicle information data is activated. Vehicle information data to be transmitted can be stored.

  It is possible to provide a vehicle state recording system, a vehicle state recording apparatus, and a vehicle state recording method capable of storing vehicle information data transmitted by other ECUs until an ECU that stores vehicle information data is activated.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a diagram for explaining the outline of the vehicle state recording system 100 of the present embodiment. FIG. 1 (a) is a diagram schematically showing the difference in activation time of each ECU, alternative ECU 11 and navigation ECU 14. FIG. 1B is a diagram schematically showing a procedure for storing vehicle information data. As shown in FIG. 1A, when the ignition (IG) is turned on, the alternative ECU 11 is activated earliest, ECU_A12 and ECU_B13 are activated before the navigation ECU 14, and ECU_N15 is activated after the navigation ECU 14. In practice, ECU_N15 that starts after navigation ECU 14 is rare. Hereinafter, when ECU_A12, ECU_B13, alternative ECU11, navigation ECU14, and ECU_N15 are not distinguished, they are simply referred to as ECUs.

  In the vehicle state recording system 100 of the present embodiment, the alternative ECU 11 that is activated earliest after the IG is turned on serves as an alternative to the navigation ECU 14 until the navigation ECU 14 is activated. That is, as shown in FIG. 1B, when the ECU_A12 and the ECU_B13 are activated, the vehicle information data is transmitted regardless of whether the navigation ECU 14 is activated, and the alternative ECU 11 records it. The alternative ECU 11 is activated prior to all ECUs that can transmit vehicle information data.

Then, when the navigation ECU 14 is activated, the alternative ECU 11 ends the recording of the vehicle information data and transmits the stored vehicle information data to the navigation ECU 14. In addition, the navigation ECU 14
-Vehicle information data received from the alternative ECU 11-Vehicle information data continuously transmitted from the ECU_A12 and ECU_B13-If there is an ECU_N15 started after the navigation ECU 14, vehicle information data transmitted from the ECU_N15
Record each one.

  Therefore, the vehicle state recording system 100 of the present embodiment can record the vehicle information data transmitted by the ECU_A12 and ECU_B13 that are activated before the navigation ECU 14 is activated, and even if a malfunction occurs before the navigation ECU 14 is activated. The vehicle information data can be used for analysis.

  In this embodiment, since the navigation ECU 14 records vehicle information data, the description will be based on the activation time of the navigation ECU 14. However, when another ECU records the vehicle information data, the activation time of the ECU is the reference. . Moreover, although the conditions of the ECU that can be used as the alternative ECU 11 will be described later, the alternative ECU 11 may be an ECU prepared for the vehicle state recording system 100 of the present embodiment, or an ECU mounted in advance in the vehicle may also be used. May be.

  In addition, although the description is based on the time point when “IG is turned on”, in the case of a hybrid vehicle or an electric vehicle that can run without turning on the IG, the time when the system is started (when the power is turned on) is the reference. That is, when the driver operates to start the system, the alternative ECU 11 is started earliest, and the alternative ECU 11 serves as a substitute for the navigation ECU 14 until the navigation ECU 14 is started.

[Transmission procedure of vehicle information data]
FIG. 2A shows an example of a schematic configuration diagram of the vehicle state recording system 100. ECU_A12, ECU_B13, alternative ECU11, and navigation ECU14 are connected to an in-vehicle LAN such as a CAN (Controller Area Network) or a LIN (Local Interconnect Network). In CAN, digital data is transmitted by associating “1” and “0” with differential voltages of two signal lines. Each ECU communicates with each other by, for example, a multi-master method that arbitrates transmission rights in a CSMA / CD (Carrier Sense Multiple Access / Collision Detection) access procedure. That is, a plurality of ECUs use one bus for communication in a time-sharing manner.

  In the case of CAN, the following data format “SOF; data ID field; RTR; control field; data field; CRC field; ACK field; EOF” is set as one frame, and vehicle information data is stored in the data field. In the data ID field, a data ID indicating the content of the transmission source ECU and the stored transmitted data (hereinafter, a data ID indicating that the vehicle information data is stored is referred to as a recording data ID) is stored. Based on the ID, each ECU determines whether or not to receive. Therefore, ECU_A12, ECU_B13, and ECU_N15 give the recording data ID when transmitting the vehicle information data, and the alternative ECU 11 (or the navigation ECU 14) selectively receives the vehicle information data based on the recording data ID.

  The navigation ECU 14 and the alternative ECU 11 take in the differential voltage every clock and convert it into digital data, take out the data field according to the control field storing the data length of the data field, and based on the error correction code of the CRC field. Correct the error and receive vehicle information data.

[Outline of each ECU]
Each ECU includes a CPU, an ASIC (Application Specific Integrated Circuit), an input / output interface, a register, a memory, a switch element (IGBT (Insulated Gate Bipolar Transistor), etc.), a CAN interface, and the like. For example, when the ECU_A12 is an engine ECU (powertrain ECU), the input / output interface of the ECU_A12 includes various sensors such as an airflow sensor, a crank position sensor, and an O2 sensor, and various actuators such as a throttle valve and a fuel injection valve. A starter button (switch) or the like is connected. The detection signal of this sensor, the state of the switch, the control information of the actuator, etc. become vehicle information data. Each ECU transmits predetermined vehicle information data to the navigation ECU 14 at predetermined cycle times (for example, at intervals of 0.5 seconds, most often intervals of about 0.2 seconds to 1 second) ( Actually, the destination is not conscious).

  The navigation ECU 14 is an ECU that controls the navigation system, and mainly performs detection of the position of the vehicle, route search to the destination, display of a road map, route guidance to the destination using the road map, and the like. In addition, a television broadcast or a radio broadcast may be received, or a CD, a DVD, or the like may be reproduced and provided to the occupant.

  The navigation ECU 14 has road map information storage means 17 having a relatively large capacity (for example, several tens to several hundreds Gbytes) for displaying a road map, and stores road map information. The road map information storage means 17 is a non-volatile memory such as a hard disk drive (HDD), a flash memory, or an MRAM (Magnetic RAM).

[Road map information storage means 17 of the navigation ECU 14]
The navigation ECU 14 stores the vehicle information data in a part of the allocated area of the road map information storage means 17 (hereinafter referred to as a vehicle information data storage area 171). When the navigation ECU 14 receives the vehicle information data from each ECU, the navigation ECU 14 stores it in the road map information storage means 17 in time series (for example, with time information) and reaches the end of the vehicle information data storage area 171. Then, the old vehicle information data is overwritten. Since the cycle in which each ECU transmits vehicle information data is similar, in many cases, the vehicle information data of ECU_A12, ECU_B13,... ECU_N15 is set as one set, and each set is recorded in time series.

  In addition to the vehicle information data storage area 171, the road map information storage means 17 has a pre-startup data storage area 172 for storing the vehicle information data transmitted from the ECU_A12 and the ECU_B13 to the alternative ECU11 before starting the navigation. The navigation ECU 14 receives vehicle information data (hereinafter referred to as accumulated data) recorded in the alternative storage means 16 from the alternative ECU 11 and stores it in the pre-startup data storage area 172.

[Alternative ECU 11]
The alternative ECU 11 includes an alternative storage unit 16 that starts earlier than the ECU that transmits the vehicle information data and stores the vehicle information data until the navigation ECU 14 is started. The alternative storage means 16 is required to have a storage capacity for storing vehicle information data transmitted from the ECU_A 12 and the ECU_B 13 during the time from when the IG is turned on until the navigation ECU 14 is activated. The time from when the IG is turned on until the navigation ECU 14 is activated (for example, about 20 seconds to 1 minute) and the vehicle information data transmitted by the ECU_A12 and ECU_B13 per unit time are known. Therefore, the storage capacity V required for the alternative storage means 16 can be calculated. The alternative storage unit 16 may be a nonvolatile memory such as an HDD, a flash memory, or an MRAM, or a volatile memory such as a DRAM.

From the above, the conditions satisfied by the alternative ECU 11 are as follows.
It starts earlier than all ECUs that can transmit vehicle information data. It has the alternative storage means 16 having a storage capacity V or more. Therefore, the alternative ECU 11 is the fastest starting among all ECUs that transmit vehicle information data. The ECU can be designated, and in this case, it is only necessary to increase the storage capacity, and it is not necessary to newly install the alternative ECU 11, so that the cost increase can be suppressed and the in-vehicle space can be saved. Moreover, if it is alternative ECU11 which only memorize | stores vehicle information data, since it can manufacture at low cost compared with ECU which controls an actuator etc., you may mount on-board ECU which satisfy | fills said conditions.

  FIG. 2B shows an example of a functional block diagram of the alternative ECU 11 and the navigation ECU 14. The CPU of the alternative ECU 11 has an alternative recording unit 21, an accumulated data transfer unit 23, and a navigation activation determination unit that are executed by hardware such as ASIC or the like, and the CPU of the navigation ECU 14 executes the program or It has an accumulated data recording unit 25, an activation completion notifying unit 24, and a vehicle information data recording unit 26 realized by hardware such as an ASIC. Each block will be described with reference to FIG.

[Transfer of vehicle information data]
FIG. 3 is a diagram schematically illustrating a procedure in which vehicle information data is recorded before and after the navigation ECU 14 is activated. Before the navigation ECU 14 is activated (FIG. 3A), the ECU_A 12 and the ECU_B 13 each transmit vehicle information data regardless of whether the navigation ECU 14 is activated. In the case of FIG. 3A, the ECU_A 12 transmits vehicle information data “498” and “499” together with the recording data ID, and the ECU_B 13 transmits vehicle information data “49A” and “49B”.

  Since the alternative ECU 11 has already been activated before the ECU_A12 or ECU_B13 is activated, the alternative recording unit 21 stores vehicle information data based on the recording data ID of the vehicle information data flowing in the CAN. Determine and record in the alternative storage means 16. In FIG. 3A, the alternative recording unit 21 receives “498”, “499”, “49A”, and “49B”, and records them in the alternative storage means 16 in time series as with the navigation ECU 14. The alternative recording unit 21 repeats such work until the navigation ECU 14 is activated.

  When the navigation activation detection unit 22 receives the activation completion information from the navigation ECU 14, the navigation activation detection unit 22 detects that the navigation ECU 14 has been activated, requests the alternative recording unit 21 to stop recording the vehicle information data, and stores the accumulated data in the accumulated data transfer unit 23. A request is made to transmit data to the navigation ECU 14. Thereby, the alternative recording unit 21 ends the recording of the vehicle information data, and the accumulated data transfer unit 23 transfers the accumulated data to the navigation ECU 14 as will be described later.

[Navi ECU 14 start-up completion]
Next, completion of activation of the navigation ECU 14 will be described. The activation completion notification unit 24 of the navigation ECU 14 determines whether or not the navigation ECU 14 has been activated, and transmits activation completion information to the alternative ECU 11 when it is determined that the navigation ECU 14 has been activated. In general, after the OS is started up, the computer often starts up the pre-registered programs in order, and when the “Navi ECU 14 starts up” depending on which function is activated based on which function is determined. Can be wide. However, in this embodiment, the navigation ECU 14 needs to be able to receive and record the vehicle information data, so strictly speaking, the CAN interface is activated and the road map information storage means 17 can be stored (HDD). Then, when the rotation speed is stabilized) and when the vehicle information data recording unit 26 for recording the vehicle information data is activated (when this program is started), it is “when the navigation ECU 14 is activated”. Considering the mechanism of starting the computer, the time when the vehicle information data recording unit 26 starts up may be the most time-out of these conditions, so when the vehicle information data recording unit 26 is actually started up. Can be defined as “when the navigation ECU 14 is activated”. Since vehicle information data can be recorded after the time when the navigation ECU 14 is activated, the time after the condition is satisfied may be defined as the time when the navigation ECU 14 is activated.

[Each functional block]
Returning to FIG. 2B, the activation completion notifying unit 24 determines that the navigation ECU 14 has been activated, for example, when the vehicle information data recording unit 26 is activated, and transmits activation completion information to the alternative ECU 11. Actually, immediately after the vehicle information data recording unit 26 is activated, the vehicle information data recording unit 26 only has to transmit the activation completion information to the alternative ECU 11, so that the activation completion notification unit 24 and the vehicle information data recording unit 26 are connected. Can be configured integrally.

  The vehicle information data recording unit 26 starts recording the vehicle information data from when the activation completion notifying unit 24 transmits the activation completion information. Thereby, the vehicle information data recording unit 26 records the vehicle information data immediately after the replacement ECU 11 records in the vehicle information data storage area 171 without the accumulated data and the vehicle information data overlapping or missing. be able to.

  The alternative ECU 11 that has received the start completion information transmits the accumulated data to the navigation ECU 14. Since the navigation ECU 14 stores the vehicle information data in a lump, the procedure for reading the vehicle information data later becomes easy. Therefore, if the vehicle information data is read from the navigation ECU 14 and the accumulated data is read from the alternative ECU 11, the accumulated data need not be transmitted to the navigation ECU 14.

  In order to indicate that the accumulated data is the vehicle information data stored in the alternative ECU 11, the accumulated data transfer unit 23 assigns a data ID (hereinafter referred to as an accumulated data ID) different from the recording data ID to the frame of the accumulated data. To the CAN. Thereby, the accumulated data recording unit 25 of the navigation ECU 14 can reliably receive the accumulated data based on the accumulated data ID. Moreover, the vehicle information data before starting can be recorded by distinguishing the vehicle information data transmitted from the ECU_A12 and the ECU_B13 from the accumulated data. Note that the timing at which the alternative ECU 11 transmits the stored data does not have to be immediately after the start completion information is received, but is, for example, when the CAN communication traffic decreases.

  The accumulated data recording unit 25 records accumulated data in the pre-startup data storage area 172. Since the vehicle information data after activation is recorded in time series in the vehicle information data storage area 171, if the accumulated data is recorded in the vehicle information data storage area 171 at the timing when the accumulated data is received, the accumulated data and the vehicle information data This is because the order may be changed. Note that the pre-startup data storage area 172 is not overwritten.

  When the accumulated data is transferred to the navigation ECU 14, the accumulated data transfer unit 23 deletes the accumulated data stored in the alternative storage unit 16. As a result, the storage capacity of the alternative ECU 11 can be released.

[Operation Procedure of Vehicle Status Recording System 100]
FIG. 4 is a flowchart showing an example of the operation procedure of the vehicle state recording system 100. The flowchart of FIG. 4 starts when IG is turned on. When the IG is turned on, the alternative ECU 11 is activated earliest among the ECUs. Therefore, the alternative ECU 11 waits until vehicle information data is transmitted from the ECU_A 12 or the ECU_B 13, and when the vehicle information data is received, the alternative recording unit 21 The received vehicle information data is recorded in the alternative storage means 16 (S10).

  In parallel with the process of the alternative ECU 11, the navigation ECU 14 continues the activation process, and the activation completion notification unit 24 of the navigation ECU 14 determines whether or not the navigation ECU 14 has been activated (S110). When the navigation ECU 14 is activated, the activation completion notifying unit 24 transmits activation completion information to the alternative ECU 11 (S120). After transmitting the activation completion information, the vehicle information data recording unit 26 receives the vehicle information data transmitted from the ECU_A 12 and the ECU_B 13 and records it in the vehicle information data storage area 171 (S130).

  It should be noted that while the start completion information is being transmitted to the alternative ECU 11, other ECUs cannot communicate with the CAN, and thus the ECU_A12 and ECU_B13 cannot transmit the vehicle information data. Therefore, after the activation completion information is transmitted, the navigation ECU 14 records the vehicle information data so that the navigation ECU 14 can receive the vehicle information data without any loss. Further, while the navigation ECU 14 is transmitting the activation completion information to the alternative ECU 11, the alternative ECU 11 cannot receive the vehicle information data from the ECU_A12 and ECU_B13, so that the accumulated data and the vehicle information data do not overlap.

  Returning to the processing of the alternative ECU 11, while the alternative recording unit 21 periodically receives the vehicle information data, the navigation activation detection unit 22 determines whether or not activation completion information has been received from the navigation ECU 14 (S20). Until the start completion information is received (No in S20), the vehicle information data received by the alternative recording unit 21 is recorded in the alternative storage means 16 (S10).

  When the activation completion information is received (Yes in S20), the navigation activation detection unit 22 requests the alternative recording unit 21 to end the recording of the vehicle information data, and transmits the accumulated data to the accumulated data transfer unit 23 to the navigation ECU 14. Request. Thereby, the alternative recording part 21 complete | finishes the recording of vehicle information data (S30).

  Further, the accumulated data transfer unit 23 reads the accumulated data from the alternative storage means 16, assigns the accumulated data ID, and transfers it to the navigation ECU 14 (S40). Further, the accumulated data transfer unit 23 erases the accumulated data in the alternative storage means 16.

  Moving to the processing of the navigation ECU 14, the accumulated data recording unit 25 receives the accumulated data and records the accumulated data in the pre-startup data storage area 172 (S140).

  As described above, the vehicle state recording system 100 according to the present embodiment is configured such that the alternative ECU 11 records the vehicle information data until the navigation ECU 14 is activated, so that the vehicle information transmitted by the ECU that is activated before the navigation ECU 14 is activated. Data can be stored. In addition, unlike freeze frame data, vehicle information data can be stored even if a failure not associated with a diagnostic code is detected. For this reason, even if a malfunction occurs before the navigation ECU 14 is activated, it can be analyzed using the vehicle information data.

  In the first embodiment, the alternative ECU 11 records the vehicle information data until the navigation ECU 14 is activated. In this embodiment, the vehicle state recording system 100 in which the ECU_A 12 and the ECU_B 13 each store the vehicle information data will be described. .

  FIG. 5A shows an example of a schematic configuration diagram of the vehicle state recording system 100. In FIG. 5A, the same components as those in FIG. In FIG. 5A, the alternative ECU 11 does not exist, the ECU_A 12 includes the individual storage unit 18A, and the ECU_B 13 includes the individual storage unit 18B (in the case of no distinction, the individual storage unit 18). The order of activation is the same as that in the first embodiment, and ECU_A 12 and ECU_B 13 are activated before the navigation ECU 14. It is assumed that ECU_N15 starts after navigation ECU14.

  The ECU_A12 and ECU_B13 of this embodiment do not transmit the vehicle information data to the navigation ECU 14 until the navigation ECU 14 is activated, but store them in the individual storage means 18A, 18B. When the navigation ECU 14 is activated, the ECU_A 12 and the ECU_B 13 transmit the stored vehicle information data (hereinafter referred to as individual data) to the navigation ECU 14 and periodically the vehicle information data after the navigation ECU 14 is activated. Send to.

  Therefore, the vehicle state recording system 100 of the present embodiment can record the vehicle information data until the navigation ECU 14 is activated without defining a fixed ECU as the alternative ECU 11.

  The individual storage means 18A needs to have a storage capacity sufficient to record the vehicle information data acquired from when the ECU_A12 is activated until the navigation ECU 14 is activated. The individual storage means 18B has a capacity after the ECU_B13 is activated. A storage capacity for recording vehicle information data acquired before the navigation ECU 14 is activated is required. Therefore, the individual storage means 18 has a necessary storage capacity that is estimated in advance or actually measured. The individual storage unit 18 may be a nonvolatile memory such as an HDD, a flash memory, or an MRAM, or a volatile memory such as a DRAM. Further, the configurations of the individual storage means 18A and 18B may be different.

  FIG. 5B shows an example of a functional block diagram of the vehicle state recording system 100. In FIG. 5B, the same components as those in FIG. Since ECU_A12 and ECU_B13 have the same configuration, only one of the functional block diagrams is shown. Each block will be described with reference to FIG.

  FIG. 6 is a diagram schematically illustrating a procedure in which vehicle information data is recorded before and after activation of the navigation ECU 14. Before the navigation ECU 14 is activated (FIG. 6A), the ECU_A12 and the ECU_B13 store the vehicle information data in the individual storage means 18A and 18B without transmitting the vehicle information data, respectively. In the case of FIG. 6A, ECU_A12 stores a plurality of sets of vehicle information data for "498" and "499", and ECU_B13 stores a plurality of sets of vehicle information data for "49A" and "49B". is doing.

  Here, ECU_N15 which starts after navigation ECU14 cannot obtain starting completion information. For this reason, if vehicle information data is memorized like ECU_A12 and ECU_B13, the timing which transmits to navigation ECU14 will be missed. Further, there is little need to store the vehicle information data in the ECU_N 15 even though the navigation ECU 14 is activated. For this reason, when an ECU that is activated after the navigation ECU 14 is connected to the CAN, the ECU inquires whether or not the navigation ECU 14 is activated immediately after the activation, and only when the navigation ECU 14 is not activated. Vehicle information data is stored in the storage means 18. Therefore, most ECUs only need to record the vehicle information data in the individual storage means 18 immediately after activation, and only the exceptional ECU needs to inquire the navigation ECU 14.

  From the above, the individual data recording unit 29 of ECU_A12 and ECU_B13 determined in advance (and the individual data recording unit 29 that has confirmed that the navigation ECU 14 has not been activated) can acquire vehicle information data periodically acquired by each ECU. Records in the individual storage means 18 in time series. The individual data recording unit 29 repeats such work until the navigation ECU 14 is activated.

  When the navigation activation detecting unit 22 receives the activation completion information from the navigation ECU 14, the navigation activation detecting unit 22 detects that the navigation ECU 14 has been activated, requests the individual data recording unit 29 to stop recording the vehicle information data, and the individual data transfer unit 28. Requesting that the individual data recorded in the individual storage means 18 be transmitted to the navigation ECU 14. Thereby, the individual data recording unit 29 ends the recording of the vehicle information data, and the individual data transfer unit 28 transfers the individual data to the navigation ECU 14 as described later.

  Since the detection of the activation of the navigation ECU 14 is the same as that in the first embodiment, the description thereof is omitted. Moreover, it is the same as that of Example 1 also in that the vehicle information data recording unit 26 starts recording the vehicle information data after the activation completion notification unit 24 transmits the activation completion information.

  The ECU_A 12 or the ECU_B 13 that has received the start completion information transmits the individual data to the navigation ECU 14. In order to indicate that the individual data is the vehicle information data stored in the individual storage means 18 of the ECU_A 12 or the ECU_B 13, the individual data transfer unit 28 includes individual ECUs and individual data in the individual data frame. A data ID indicating this (hereinafter referred to as individual data ID) is given and transmitted to the CAN. Thereby, the individual data recording unit 29 of the navigation ECU 14 can reliably receive the individual data based on the individual data ID. In addition, the vehicle information data transmitted from the ECU_A12 and the ECU_B13 can be distinguished from the individual data continuously and recorded as vehicle information data before activation. The individual data is recorded in the pre-startup data storage area 172.

  By the way, when the activation times of ECU_A12 and ECU_B13 are different, the numbers of vehicle information data stored in the individual storage means 18A and 18B are different (when the interval of recording the vehicle information data is the same). FIG. 7 is a diagram schematically showing the vehicle information data stored in the individual storage means 18A and 18B. For example, when ECU_A12 has a shorter startup time, the number of pieces of vehicle information data (five pieces) of ECU_A12 is larger than the number of vehicle information data pieces (three pieces) of ECU_B13. For this reason, when the individual data recording unit 29 merges both in the order recorded by the ECU_A12 and the ECU_B13 (for example, it is assumed that A1 and B1 are detected at a close time), the vehicle information data before activation has a detection time around Vehicle information data to be mixed.

  On the other hand, since the time at which the start completion information is received is the same in ECU_A12 and ECU_B13, the latest vehicle information data (for example, A5 and B3) may be detected at a close time. Therefore, the individual data recording unit 29 merges two pieces of vehicle information data from the newest vehicle information data. Since the individual data is stored in time series, the newest vehicle information data is known to the individual data recording unit 29. In addition, since the cycle time at which each ECU stores the vehicle information data is also known, if the navigation ECU 14 traces the individual data based on the time at which the start completion information was transmitted to each ECU, the approximate time at which the individual data was recorded is obtained. Can be identified.

  The individual data transfer unit 28 deletes the individual data stored in the individual storage means 18 after transferring the individual data to the navigation ECU 14. Thereby, the storage capacity of ECU_A12 and ECU_B13 can be released.

[Operation Procedure of Vehicle Status Recording System 100]
FIG. 8 is a sequence diagram illustrating an example of an operation procedure of the vehicle state recording system 100. The sequence diagram of FIG. 8 starts when IG is turned on. When the IG is turned on, ECU_A12 and ECU_B13, which are started earlier than the navigation ECU 14, respectively record the vehicle information data in the individual storage means 18A and 18B (S210).

  In parallel with the processes of ECU_A12 and ECU_B13, the navigation ECU 14 continues the activation process. When the activation of the navigation ECU 14 is completed (S220), the activation completion notification unit 24 transmits activation completion information to the ECU_A12 and ECU_B13 (S230). This transmission can be performed in a broadcast manner by addressing all ECUs to the data ID.

  When the ECU_A 12 and the ECU_B 13 receive the activation completion information from the navigation ECU 14, the navigation activation detection unit 22 requests the individual data recording unit 29 to end the recording of the vehicle information data, and transmits the individual data to the individual data transfer unit 28 to the navigation ECU 14. Request to do. Thereby, the individual data recording part 29 complete | finishes the recording of vehicle information data (S240).

  Further, when it is detected that the navigation ECU 14 is activated based on the activation completion information, the ECU_A 12 and the ECU_B 13 periodically transmit vehicle information data to the navigation ECU 14 (S250, S260).

  The vehicle information data recording unit 26 receives the vehicle information data transmitted from the ECU_A12 and the ECU_B13, adds time information, and records the time information in the vehicle information data storage area 171 (S240).

  Further, the individual data transfer unit 28 reads out the individual data from the individual storage means 18, assigns the individual data ID, and transfers it to the navigation ECU 14 (S280). The individual data transfer unit 28 erases the individual data in the individual storage means 18.

  Moving to the processing of the navigation ECU 14, the individual data recording unit 29 receives the individual data, performs merging or the like, and records the individual data in the pre-startup data storage area 172 (S290). In addition, it is the same as in the first embodiment that the individual data and the vehicle information data recorded by the navigation ECU 14 cannot be duplicated or lost.

  As described above, in addition to the effects of the first embodiment, the vehicle state recording system 100 according to the present embodiment can record the vehicle information data until the navigation ECU 14 is activated without using the alternative ECU 11.

  Further, the present embodiment may be applied to the first embodiment. In this case, the ECU_A 12 and the ECU_B 13 record the vehicle information data in the individual storage means 18A and 18B, respectively, until the alternative ECU 11 is activated. And if alternative ECU11 starts, ECU_A12 and ECU_B13 will transmit the vehicle information data memorize | stored in the separate memory | storage means 18A, 18B to alternative ECU11. The activated alternative ECU 11 receives the vehicle information data from the ECU_A 12 and the ECU_B 13 and stores them in the alternative storage means 16. When the navigation ECU 14 is activated, the vehicle information data stored in the alternative storage means 16 is transmitted to the navigation ECU 14. To do.

  That is, since the vehicle information data is successively transferred from the ECU_A 12 and the ECU_B 13 to the alternative ECU 11 and from the alternative ECU 11 to the navigation ECU 14, the alternative ECU 11 does not need to be activated earliest. In this case, an existing ECU with sufficient storage capacity may be designated as the alternative ECU 11, so that an increase in cost can be easily suppressed. Further, instead of an ECU having sufficient storage capacity, a plurality of ECUs may be designated as alternative ECUs 11 and vehicle information data may be distributed and stored.

  Vehicle information data stored in the vehicle information data storage area 171 and the pre-startup data storage area 172 by the vehicle state recording system 100 according to the first or second embodiment is diagnosed by a service person when the vehicle is brought into a repair shop. Is used for grasping the state of a part, fault diagnosis, and the like.

  Further, the vehicle information data stored in the vehicle information data storage area 171 and the pre-startup data storage area 172 may be transmitted to the server without being brought into the repair shop.

  FIG. 9A is a diagram schematically illustrating the server 110 that receives vehicle information data. The server 110 collects vehicle information data from a plurality of vehicles more efficiently. The vehicle information data read out at the repair shop can also be transmitted to the server 110. However, by sending the vehicle information data directly from the vehicle as shown in FIG. 9 (a), it is not necessary to bring the vehicle into the repair shop. Vehicle information data can be collected, and vehicle information data related to minor abnormalities that are difficult for the driver to notice can be collected by the server 110.

  FIG. 9B is an example of a schematic configuration diagram of the vehicle state recording system 100 of the present embodiment. In FIG. 9B, the same parts as those in FIG. In addition, the vehicle state recording system 100 of Example 1 or 2 may be applied to the configuration transmitted to the server 110.

  In the vehicle state recording system 100 of the present embodiment, the communication device 39 is connected to the CAN. The communication device 39 is connected to a base station 41 of a mobile phone or a wireless LAN access point, and communicates with a telecommunications carrier's gateway server. The communication device 39 modulates vehicle information data by a method determined by a communication carrier (for example, primary modulation by QPSK or QPSK, secondary modulation by OFDM), and transmits the vehicle information data to the gateway server.

  The gateway server is connected to a network 42 such as the Internet, demodulates the vehicle information data, and transmits the vehicle information data to the server 110 according to a standard protocol (for example, TCP, IP). Note that the IP address or domain name of the server 110 is known to the vehicle state recording system 100.

  Therefore, the server 110 can receive the vehicle information data transmitted by the ECU that was started before the navigation ECU 14 was started, and can be used for failure analysis. The server 110 may use data mining with or without teacher data for failure analysis.

It is a figure explaining the outline of a vehicle state recording system. It is an example of the schematic block diagram of a vehicle state recording system. It is a figure which illustrates typically the procedure in which vehicle information data is recorded before and after starting of navigation ECU. It is a flowchart figure which shows an example of the operation | movement procedure of a vehicle state recording system. It is an example of the schematic block diagram of a vehicle state recording system. It is a figure which illustrates typically the procedure in which vehicle information data is recorded before and after starting of navigation ECU. It is a figure which shows typically the vehicle information data memorize | stored in each separate memory | storage means. It is a sequence diagram which shows an example of the operation | movement procedure of a vehicle state recording system. It is an example of the figure which shows typically the server which receives vehicle information data. It is a figure which shows typically the shift | offset | difference of starting time of each ECU and navigation ECU.

Explanation of symbols

11 Alternative ECU
12 ECU_A
13 ECU_B
14 Navi ECU
16 Alternative storage means 17 Road map information storage means 18, 18A, 18B Individual storage means 171 Vehicle information data storage area 172 Pre-startup data storage area

Claims (9)

In a vehicle state recording system for recording vehicle information data transmitted from a diagnosis target apparatus mounted on a vehicle in a first vehicle information data storage unit,
Detecting means for detecting that the first vehicle information data storage means can store vehicle information data;
Second vehicle information data storage means for storing vehicle information data from when the vehicle is turned on until the first vehicle information data storage means can store the vehicle information data;
Vehicle information data stored in the second vehicle information data storage means from when the vehicle is turned on until the first vehicle information data storage means can store the vehicle information data is stored in the first vehicle information data storage means. Transfer means for transferring the vehicle information data storage means,
Recording means for writing the vehicle information data transferred by the transfer means to the first vehicle information data storage means;
A vehicle state recording system comprising: The transfer means transfers the vehicle information data stored in the second vehicle information data storage means to the first vehicle information data storage means.
When the second vehicle information data storage means stores the vehicle information data, a data ID different from the data ID assigned to the vehicle information data is assigned and transferred to the first vehicle information data storage means. ,
The vehicle state recording system according to claim 1. The second vehicle information data storage means is shorter than the first vehicle information data storage means until the vehicle information data can be stored after the vehicle is turned on.
The vehicle state recording system according to claim 1 or 2, characterized in that The first vehicle information data storage means has a larger storage capacity than the second vehicle information data storage means.
The vehicle state recording system according to any one of claims 1 to 3. Communication means for transmitting the vehicle information data stored in the first vehicle information data storage means to the outside of the vehicle;
The vehicle state recording system according to claim 1, comprising: The first vehicle information data storage means is a storage means for a navigation device.
The vehicle state recording system according to any one of claims 1 to 5, wherein The second vehicle information data storage means can store the storage means included in the diagnosis target device for controlling the in-vehicle device, and the first vehicle information data storage means can store the vehicle information data from when the vehicle is powered on. Until then, realized by using,
The vehicle state recording system according to any one of claims 1 to 6, wherein In a vehicle state recording device for recording vehicle information data transmitted from a diagnosis target device mounted on a vehicle in a first vehicle information data storage unit,
Notification means for notifying the control unit of the second vehicle information data storage means that the first vehicle information data can be stored in the vehicle information data;
Second vehicle information data storage means for storing vehicle information data from when the vehicle is turned on until the first vehicle information data storage means can store the vehicle information data;
Vehicle information data stored in the second vehicle information data storage means from when the vehicle is turned on until the first vehicle information data storage means can store the vehicle information data is stored in the first vehicle information data storage means. Transfer means for transferring the vehicle information data storage means,
Recording means for writing the vehicle information data transferred by the transfer means to the first vehicle information data storage means;
A vehicle state recording apparatus comprising: In a vehicle state recording method for recording vehicle information data transmitted from a diagnosis target apparatus mounted on a vehicle in first vehicle information data storage means,
A step of detecting that the first vehicle information data can be stored in the vehicle information data;
Storing the vehicle information data in the second vehicle information data storage means from when the vehicle is turned on until the first vehicle information data storage means can store the vehicle information data;
The transfer means stores vehicle information data stored in the second vehicle information data storage means from when the vehicle is turned on until the first vehicle information data storage means can store the vehicle information data. Transferring to the first vehicle information data storage means;
A recording unit writing the vehicle information data transferred by the transfer unit into the first vehicle information data storage unit;
A vehicle state recording method comprising:

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