JP5561186B2 - In-vehicle network system - Google Patents

Description

  The present invention relates to an in-vehicle network system having a function of recording event data.

  Conventionally, behavior data indicating vehicle behavior (speed, impact, etc.) and driver operation status (steering wheel, brake operation, etc.) when a vehicle causes a traffic accident or performs accident avoidance behavior such as sudden braking Event data recorder (hereinafter also referred to as EDR) is known that records operation data or the like indicating event data as event data.

  In general, in this type of EDR, a configuration in which various sensors are directly connected to a recording control device (Electronic Control Unit: hereinafter also referred to as ECU) that records event data (for example, (See Patent Document 1).

  However, in recent vehicles, particularly automobiles, in order to respond to market demands such as fuel saving, safety improvement, convenience improvement, etc., the number of various control target devices and ECUs for controlling them has been increasing. In particular, due to restrictions on wiring space, it is difficult to directly connect sensors necessary for controlling the control target device to many ECUs.

  For this reason, in recent years, in general, in automobiles, each ECU is connected to a common communication line so that the necessary minimum number of sensors can be directly connected to each ECU, and data necessary for linkage operation can be transmitted and received between the ECUs. By connecting to each other, an in-vehicle network (so-called in-vehicle LAN) is constructed.

  In the vehicle system in which the in-vehicle LAN is constructed in this way (hereinafter referred to as the in-vehicle network system), a configuration is employed in which each ECU records various detection values by sensors directly connected as event data. . In addition, after an event such as a traffic accident (vehicle collision) or accident avoidance behavior occurs, the event data is aggregated to an ECU having an external communication function via an in-vehicle network, and the event data is transmitted to an external management center by this ECU. Thus, it has been proposed that the management center collect event data.

Japanese Patent Laid-Open No. 7-244761

  However, in the conventionally proposed in-vehicle network system, although the wiring space can be simplified, since event data is distributed to a plurality of ECUs immediately after an event occurs, all event data can be efficiently transmitted to the management center. There was a problem that it was likely to be difficult.

  In order to solve the above problems, an object of the present invention is to enable event data to be collected with high probability in an in-vehicle network system having an EDR function.

  The in-vehicle network system according to claim 1, which is an invention made to achieve the above object, includes a plurality of electronic control devices (hereinafter also referred to as ECUs) that control different control target devices mounted on a vehicle. This is a system connected via an in-vehicle network for data communication. However, in this system, each electronic control device is connected to one or a plurality of detection devices so as to be able to input detection values necessary for controlling the corresponding control target devices, and detections input from the detection devices. A data storage process for storing values is performed.

The present invention includes a recording control device as an electronic control device that records event data in this configuration. And in the data storage process which each ECU performs, a detected value is transmitted to a recording control apparatus via a vehicle-mounted network. On the other hand, the recording control device has a storage unit that stores detection values received from each ECU via the in-vehicle network, and an external communication unit that performs wireless communication with a management device provided in an external management center. In addition, event detection means for detecting a preset event based on the behavior of the vehicle is provided. Such a recording control device updates the storage content of the storage unit so that the detection value is always stored for a predetermined holding period, and when an event is detected by the event detection unit, the external control unit An external communication unit that transmits an identification signal for identifying the vehicle to the management device and that is triggered by reception of a request signal returned from the management device in response to the identification signal via the external communication unit The content stored in the storage unit is transmitted as event data to the management device via the.
Further, the storage unit stores event data for each category corresponding to the detection device, and the recording control device is configured to transmit the event data to the management device in a different category order depending on the type of event.

  The external management center refers to a center that manages event data for each vehicle. Based on the event data managed here, for example, a contact for confirming the state of the driver, safety, etc. The data necessary for the situation analysis at the time of a vehicle accident is summarized.

  In the in-vehicle network system configured as described above, when each ECU performs data storage processing, various detection values by the detection devices directly connected to the respective ECUs are transmitted to the recording control device via the in-vehicle network, As the event data, the latest data for a certain period is continuously recorded in the recording control device, and the event data is transmitted to the management device at a predetermined timing.

  Therefore, according to the in-vehicle network system of the present invention, it is possible to efficiently transmit all event data to the management center by always collecting and recording various event data in the ECU having an external communication function. Eventually, event data can be collected by the management center with a high probability.

  In the in-vehicle network system, only one ECU or a plurality of ECUs having an external communication function (that is, a recording control device) may be provided. In the former case, the storage capacity of the entire system can be saved, and in the latter case, by recording all event data in a plurality of recording control devices, there is a risk that event data cannot be collected due to damage to the device itself. Can be dispersed.

  According to the present invention, as described in claim 2, in the data storage process performed by each ECU, the storage destination information (in other words, the recording destination information) indicating the storage destination (in other words, the recording destination) of the detected value is used. The detection value is transmitted based on the information, and in the storage destination information, the address of the recording control device (specifically, the address in the in-vehicle network) may be specified as the storage destination.

  According to the in-vehicle network system configured as described above, it is possible to transmit input values from the detection devices connected to the respective ECUs to the recording control device without accumulating the respective ECUs. A large number of ECUs can be integrated into the recording control apparatus, thereby reducing the cost of the entire system. In other words, it is more likely that the overall cost will be reduced when a small number of large capacity storage devices are arranged than when a large number of small capacity storage devices are arranged.

  According to the present invention, as described in claim 3, the in-vehicle network is composed of a plurality of series networks having different protocols, and the recording control apparatus performs electronic control for performing gateway processing for relaying data communication between the series networks. It may be a device.

  That is, instead of using an ECU having a vehicle component such as an engine or a brake as a control target device, an ECU having another ECU constituting the in-vehicle network as a control target device is used as the recording control device. As a result, various detection values can be received when data communication is performed between other ECUs, and event data can be stored efficiently.

In addition, as described in claim 1 , the recording control apparatus includes an event detection unit that detects a preset event based on the behavior of the vehicle, and when the event is detected by the event detection unit, An identification signal for identifying the vehicle is transmitted to the management device via the external communication unit. In this configuration, the event data transmission timing from the recording control apparatus to the management apparatus is triggered by the reception of the request signal returned from the management apparatus to the above identification signal via the external communication unit. timing der to Apply predicates.

  In this case, wasteful communication between the recording control device and the management device is achieved by limiting the transmission timing to the time when the event occurs, as compared with a configuration in which event data is periodically transmitted from the recording control device to the management device. Can be suppressed, and as a result, the event data can be efficiently collected by the management device.

In the present invention, as described in claim 4 , one of the event detection means may be a collision detection means for detecting a collision of the vehicle as an event from an acceleration applied to the vehicle. In this case, at least event data in the event of a vehicle accident due to a collision can be collected by the management device, and the management device collects data necessary for situation analysis at the time of the vehicle accident, thereby avoiding unnecessary trouble for the driver. The possibility can be increased.

In addition, as described in claim 1 , the storage unit stores event data for each category corresponding to the detection device, and the recording control device manages the event data in a different category order according to the event type. It is configured to transmit to the device.

  According to the in-vehicle network system configured as described above, compared to the configuration in which the transmission order of event data is fixed in advance, for example, the category of the category that is strongly related to the event that occurred before the recording control device is damaged. The possibility that the management device collects the event data can be increased.

In the present invention, as described in claim 5 , the event type includes a sudden brake, a sudden acceleration, and a sudden handle of the vehicle in addition to the collision of the vehicle. The apparatus may be configured to transmit the event data to the management apparatus in order of the category having the higher priority based on the event data map in which the priority of the category is set in advance according to the event type.

  According to the in-vehicle network configured as described above, the event type and the transmission order of the event data are associated in advance by the event data map. For example, the transmission order (that is, the category priority) by the system operator. When the change is made, it is only necessary to rewrite the event data map, so that the design change can be easily performed.

It is a block diagram which shows the structure of the vehicle-mounted network system 1 to which this invention was applied. It is a flowchart which shows the procedure of the recording control process which gateway ECU10 performs. 3 is a matrix diagram showing a configuration of an event data map 40. FIG. It is a flowchart which shows the procedure of the memory writing process performed in parallel with a recording control process.

Embodiments of the present invention will be described below with reference to the drawings.
[overall structure]
FIG. 1 is a block diagram showing a configuration of an in-vehicle network system 1 to which the present invention is applied.

  As shown in FIG. 1, an in-vehicle network system 1 according to the present embodiment includes an in-vehicle LAN 2 constructed by each electronic control device (ECU 11 to 37) installed in the vehicle, and an ECU 11 to 37 in the in-vehicle LAN 2. The gateway ECU 10 stores data indicating the operation state of the vehicle (operator's operation state, vehicle behavior, vehicle state, etc.) based on the input data. The ECUs 10 to 37 are mainly configured by a known microcomputer including a CPU, a ROM, a RAM, a flash memory, an I / O, and a bus line connecting these components.

  The in-vehicle LAN 2 constructed in the vehicle is composed of a series network having different protocols, specifically, a control system network 4, a body system network 6, and an AVC network 8. In each network, the ECU in the vehicle corresponding to each system is connected to a common transmission line. For example, the control system network 4 is connected to ECUs for vehicle control related to traveling such as an engine ECU 11, an ECT / ECU 13, a VSC / ECU 15, an ACC / ECU 17, and a surrounding monitoring ECU 19.

  Here, the engine ECU 11 is an electronic control device that controls an engine mounted on the vehicle as a control target device, and the ECT / ECU 13 is a shift control device that performs shift control of the automatic transmission, and these are so-called power trains. It is a system control device. For example, a vehicle speed sensor 11a, a throttle opening sensor 11b, and an accelerator pedal opening sensor 11c are connected to the engine ECU 11 as detection devices for detecting a vehicle speed, an engine control state, and an accelerator operation state. In the engine ECU 11, the CPU sends detection data representing detection values from the respective sensors 11 a to 11 c via the control system network 4 based on storage destination information stored in advance as program setting information in the flash memory. By transmitting the data to the gateway ECU 10, data storage processing is performed in place of storing the data in its own memory. That is, in the storage destination information, the address of the gateway ECU 10 is designated in advance as the storage destination of the detection data, so that it is not necessary to accumulate the detection data in the flash memory in the engine ECU 11.

  The VSC / ECU 15 is a control device that controls the attitude and braking of the vehicle, the ACC / ECU 17 is a travel control device that controls the vehicle to follow the preceding vehicle, and the periphery monitoring ECU 19 It is a control device that determines the risk of collision with other vehicles based on surrounding images (including the front image) obtained by capturing (including the front) and warns the driver according to the risk of collision, These are so-called vehicle motion control devices. For example, a steering sensor 15a and a brake pedal depression sensor 15b are connected to the VSC / ECU 15 as detection devices for detecting a steering operation state and a brake operation state. In the VSC / ECU 15, the CPU transmits detection data representing detection values from the sensors 15 a to 15 b to the gateway ECU 10 via the control system network 4 in the same manner as described above (similar to the CPU of the engine ECU 11). Further, in the ACC / ECU 17, a front / rear G sensor 17a and a yaw rate sensor 17b for detecting acceleration (yaw rate) around the turning axis of the vehicle are connected as detection devices for detecting acceleration (longitudinal acceleration) along the traveling direction of the vehicle. Acceleration data representing the longitudinal acceleration and the yaw rate is transmitted as detection data to the gateway ECU 10 via the control system network 4. In addition, the periphery monitoring ECU 19 is connected to an outside camera 19 a as a detection device for inputting the above-described surrounding image, and transmits the surrounding image data as detection data to the gateway ECU 10 via the control system network 4.

  On the other hand, body control ECUs such as a meter ECU 21, an anti-theft ECU 23, and an airbag ECU 25 are connected to the body network 6. The meter ECU is for displaying various vehicle states such as vehicle speed, engine speed, door open / close state, transmission shift range, etc. on the display device. The anti-theft ECU 23 monitors the vehicle state, When a malicious person tries to steal each device in the vehicle, it is used to sound an alarm sound or make an emergency call to an external center. The airbag ECU 25 is used to control the airbag. is there. For example, the airbag ECU 25 is connected to a collision G sensor 25a as a collision detection means, and when the large acceleration (for example, 10G or more) that occurs at the time of a vehicle collision is detected by the collision G sensor 25a, that fact. Is transmitted to the gateway ECU 10 via the body system network 6. The anti-theft ECU 23 includes a communication unit for performing wireless communication with an external center.

  In addition, the AVC network 8 is connected to an AVC ECU belonging to an information device that provides various information (information display, reproduction, etc.) such as a navigation ECU 31, an audio ECU 33, a telephone ECU 35, and an ETC / ECU 37. The navigation ECU 31 is for performing route calculation and route guidance taking into account traffic conditions based on the current position of the vehicle, the destination, map data, information received from an external center, etc. The telephone ECU 35 is connected to a mobile phone or the like possessed by the user and inputs / outputs the contents of the call with the other party. When the ETC / ECU 37 receives command information related to charging from an external center, the ETC / ECU 37 reads various information from a card reader connected to the ETC / ECU 37 in response to the command information and sends it to the external center. It is. The navigation ECU 31 and the ETC / ECU 37 are configured to have a communication unit for performing wireless communication with an external center.

  In addition, in the in-vehicle network system 1 of the present embodiment, a communication protocol is set in advance so that shared data (including detection data) can be transmitted and received between ECUs belonging to at least the same network. Specifically, The control network 4 employs FlexRay (registered trademark), the body network 6 employs LIN (Local Interconnect Network), and the AVC network 8 employs CAN (Controller Area Network) as a communication protocol.

  The communication frame used in FlexRay is a static segment composed of fixed-length slots that are fixedly allocated to each terminal, a dynamic segment composed of variable-length slots that are dynamically allocated to each terminal, It is a well-known one consisting of a symbol window used as an option at the time of wakeup, etc., a network synchronization time used for clock synchronization offset and transmission speed calculation, error correction, and the like.

A communication frame used in LIN is a well-known frame including a header output from the master node and a response output from the node that transmits data following the header.
On the other hand, a communication frame used in CAN receives SOF (Start Of Frame) indicating the start of the frame, an identifier for determining the priority of communication arbitration, a control field indicating the number of bytes of the subsequent data field, and the reception side receives it correctly. It is a well-known one consisting of a CRC (Cyclic Redundancy Check) and ACK (Acknowledgement) field indicating whether or not it has been completed, a data field indicating data, an end of frame (EOF) indicating the end of the data field, and the like.

  Furthermore, in the in-vehicle network system 1 of the present embodiment, a gateway ECU 10 is provided as a relay device that relays data communication so that shared data (including detection data) can be transmitted and received between ECUs belonging to different affiliated networks. Yes. Note that a diagnostic diagnostic ECU 100 is connected to the gateway ECU 10 via the control system network 4. Incidentally, the diagnosis diagnosis ECU 100 diagnoses the presence / absence of failures of various control target devices and detection devices (and various vehicle states) based on detection data stored in the gateway ECU 10.

[Configuration of Gateway ECU]
As described above, the gateway ECU 10 is configured mainly with a microcomputer (microcomputer), and as a gateway process, for example, a communication frame (CAN message) received from the AVC network 8 or a LIN message sent from the body network 6 is sent to the FlexRay. A process of converting to a message and sending it to the control system network 4 is performed. Further, for example, a FlexRay message sent from the control network 4 is converted into a CAN message (and LIN message) and sent to the AVC network 8 (and the body network 6).

  Specifically, in gateway processing, time information (time stamp) indicating the reception timing is added to a message received from an ECU connected to the AVC network 8 and the body network 6 (lower network), and a static segment is added. Alternatively, the message may be transmitted to the control system network 4 (upper network) in a dynamic segment. More specifically, in the gateway process, the entire FlexRay dynamic segment may be used as a pass-through period, and the upper network and the lower network may be connected to each other during the pass-through period to form a single network.

  The gateway ECU 10 is housed in a housing made of, for example, stainless steel, and is a non-volatile storage that stores detection data received via the in-vehicle LAN 2 as a configuration for realizing a function as an event recorder. Unit 10a and an external communication unit 10b for performing wireless communication with a management device 99 provided in a management center that manages event data for each vehicle.

[Recording control processing]
Here, a recording control process executed by the microcomputer (CPU) of the gateway ECU 10 will be described with reference to the flowchart of FIG. In the gateway ECU 10, the storage unit 10a includes an area (data storage area) for storing detection data for each category corresponding to various sensors directly connected to the ECUs 11 to 37 of the in-vehicle LAN 2. An area (map storage area) is provided for storing an event data map 40 (see FIG. 3) in which priorities of categories (event data) are set in advance in accordance with the event types described later. Incidentally, the event data map 40 is preinstalled in the map storage area.

  First, when the recording control process is started by turning on the ignition switch of the vehicle, as shown in FIG. 3, writing of data to the data storage area of the storage unit 10a is permitted (S110), and the traffic of the vehicle It is determined whether an event representing the behavior of the vehicle leading to an accident or an accident avoidance behavior has occurred (S120). Specifically, when a collision event signal is received via the body system network 6, it is determined that a vehicle collision has occurred as an event, or based on acceleration data received via the control system network 4, the longitudinal acceleration is determined. Alternatively, when the yaw rate exceeds a predetermined threshold, it is determined that sudden acceleration / deceleration (rapid acceleration, sudden braking) or sudden steering (event) has occurred as an event. If it is determined that an event has not occurred, the process is on standby by repeating the same steps.

  On the other hand, when an event occurs, a timer that times out when a preset standby time elapses is started (S130), and it is determined whether or not the timer has timed out (S140). If the timer has not timed out, the same step is repeated to wait, while if it has timed out, writing of data to the data storage area of the storage unit 10a is prohibited (S150).

  Subsequently, an identification signal that identifies the vehicle and represents the type of the event that occurred in S120 is transmitted to the management device 99 via the external communication unit 10b (S160), and the management device 99 returns a response to this identification signal. It is determined whether or not a request signal to be received has been received (S170). If this request signal has not been received within a predetermined period, the process returns to S110.

  On the other hand, when a request signal is received, it is detected in a different category order (specifically, category priority order) according to the type of event (collision, rapid acceleration, sudden brake, sudden handle) that occurred in S120. Event data, which is a bundle of data, is wirelessly transmitted to the management apparatus 99 via the external communication unit 10b (S180), and this process ends. Specifically, in the event data map 40, as shown in FIG. 3, when the event type is a vehicle collision, the vehicle speed, the order of the event data having the highest category priority (priority order), The surrounding image, accelerator operating state, and brake operating state are defined. If the event type is a sudden acceleration of the vehicle, the vehicle speed, the accelerator operation state, the surrounding image, and the brake operation state are in order of priority. If the event type is a sudden brake, the vehicle speed, In the case of the brake operation state, surrounding image, and accelerator operation state, and the event type is a sudden handle, the vehicle speed, the handle operation state, the accelerator operation state, and the brake operation state are in order of priority. Thus, in the event data map 40, the event data is divided so that the higher the degree of association with the event and the necessity for analysis, the higher the priority, that is, the transmission order comes first.

  Next, when the memory writing process that is executed in parallel with the recording control process is started, as shown in FIG. 4, it is determined whether or not it is the acquisition timing of the behavior data set at a certain period (for example, 6 ms). (S210) If it is an acquisition timing, a collision event signal (only when output spontaneously from the airbag ECU 25) is transmitted via the body system network 6 to the vehicle speed and acceleration data via the control system network 4. Is read, and the behavior data as a result of the reading is written into the data storage area of the storage unit 10a (S220), and the process returns to S210. In the data storage area, behavior data is written for each category (collision presence / absence, vehicle speed, longitudinal acceleration, yaw rate).

  On the other hand, if it is not the behavior data acquisition timing, it is determined whether or not the operation status data is received via the in-vehicle LAN 2 (S230). The operation status data refers to detection data representing the accelerator operation state, the steering operation state, the brake operation state, and the peripheral image transmitted from the engine ECU 11, the VSC / ECU 15, and the periphery monitoring ECU 19 at regular intervals (for example, a cycle of 60 ms). That is.

  If operation data has not been received, the process directly returns to S210. On the other hand, if operation data has been received, a process of writing the received operation status data in the data storage area of the storage unit 10a is executed (S240). After that, the process returns to S210. In the data storage area, as described above (similar to S220 above), each operation status data is written by being classified into categories (accelerator operation state, steering operation state, brake operation state, peripheral image). Further, when an event occurs in the previous S120, the writing order of each operation status data here is based on the event data map 40, and the type of the event that has occurred (collision, rapid acceleration, sudden brake, sudden handle) ) Depending on the category order (specifically, category priority order).

  However, in S220 and S240, the writing to the storage unit 10a is executed only during the period from when the data writing is permitted in the previous S110 until the data writing is prohibited in S150. ing. In addition, writing to the storage unit 10a is performed in time series order, and when data is written in all the data storage areas, the oldest data is overwritten (updated) in order. As a whole, data for a preset holding period (for example, 20 seconds) is always held in the storage unit 10a. In other words, each data stored in the storage unit 10a is set in advance so as to be held in the storage unit 10a only for the holding period.

  When an event occurs in the previous S120, updating of the contents of the storage unit 10a is prohibited after the above-described waiting time has elapsed (however, the waiting time may be approximately 0 s). Thereby, the data before and after the event occurrence is held in the storage unit 10a.

[Effect of this embodiment]
As described above, in the in-vehicle network system 1 of the present embodiment, the gateway ECU 10 periodically receives detection data from the other ECUs 11 to 37 via the in-vehicle LAN 2, and a bundle of these received data is used as event data. The latest event data is always recorded in the storage unit 10a, and when the event occurs, the recorded content is transmitted to the management device 99 via the external communication unit 10b.

  Therefore, according to the in-vehicle network system of the present embodiment, it is not always necessary to devote time for acquiring all event data from the other ECUs 11 to 37 after the occurrence of the event. As a result, the management apparatus 99 can collect event data with high probability.

  In the in-vehicle network system 1, when the gateway ECU 10 detects the occurrence of an event, the gateway ECU 10 preferentially stores data (important data) having a high degree of relevance to the event and a high necessity at the time of analysis in the storage unit 10a. The event data, which is a bundle of data, is sequentially transmitted to the management apparatus 99 via the external communication unit 10b.

  For this reason, even if the gateway ECU 10 is damaged before the transmission of all event data is completed, the management device 99 sequentially starts from the event data that is considered to be necessary for the management center to grasp and analyze the vehicle situation. By transmitting to, important event data can be collected with a high probability by the management apparatus 99.

  Further, in the in-vehicle network system 1, since the gateway ECU 10 executes the recording control process, when the detection data is transmitted and received between ECUs with different networks, the detection data is transmitted while executing the gateway process that relays the detection data. It becomes possible to record in the memory | storage part 10a, and event data can be efficiently accumulate | stored by extension.

  Further, in the in-vehicle network system 1, the transmission destination of the detection data by each ECU 11 to 37 can be changed by changing the storage destination information in the program for executing the data storage process. It is not necessary to rewrite the whole, and as a result, the present system 1 can be introduced relatively easily into an existing conventional system.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is possible to implement in various aspects.

  For example, in the in-vehicle network system 1 of the above-described embodiment, the gateway ECU 10 is configured to perform the recording control process, but is not limited to this configuration. Specifically, by installing a storage unit for storing detection data in other ECUs 23, 31, 37 and the like having communication units capable of communicating with an external center, at least one of these ECUs 23, 31, 37 is installed. One may be configured to perform a recording control process.

  In the in-vehicle network system 1 of the above embodiment, the steering sensor 15a and the brake pedal depression sensor 15b are directly connected to the VSC / ECU 15. However, the present invention is not limited to this. For example, the steering and the brake are separately provided. You may connect to two ECUs to control, respectively. Similarly, other sensors in the vehicle may be directly connected to other ECUs.

  Further, in the event data map of the above embodiment, the category priority is set as shown in FIG. 3, but the present invention is not limited to this, and may be changed as necessary. The map may be overwritten (updated) in a predetermined area of the storage unit.

DESCRIPTION OF SYMBOLS 1 ... In-vehicle network system, 2 ... In-vehicle LAN, 4 ... Control system network, 6 ... Body system network, 8 ... AVC network, 10 ... Gateway ECU, 10a ... Memory | storage part, 10b ... External communication part, 11 ... Engine ECU, 11a ... Vehicle speed sensor, 11b ... Throttle opening sensor, 11c ... Accelerator pedal opening sensor, 15 ... VSC / ECU, 15a ... Steering sensor, 15b ... Brake pedal depression sensor, 17 ... ACC / ECU, 17a ... Front / rear G sensor, 17b ... Yaw rate sensor, 19 ... Ambient monitoring ECU, 19a ... External camera, 25 ... Airbag ECU, 25a ... Collision G sensor, 40 ... Event data map,
99 ... Management device, 100 ... Diagnostic diagnosis ECU.

Claims (5)

A plurality of electronic control devices that control different control target devices mounted on a vehicle are connected via an in-vehicle network for data communication, and each electronic control device has a corresponding control target device. An in-vehicle network system that is connected to one or more detection devices so as to be able to input detection values necessary for control, and performs data storage processing for storing detection values input from the detection devices,
A recording control device as an electronic control device for recording event data;
In the data storage process, the detected value is transmitted to the recording control device via the in-vehicle network,
The recording control device performs external communication between a storage unit that stores a detection value received via the in-vehicle network and a management device provided in a management center that manages the event data for each vehicle. And an event detection means for detecting a preset event based on the behavior of the vehicle,
The recording control apparatus, together with the detected value to update the stored contents of the storage unit so as to be always stored for the predetermined holding period, the said event is detected by the event detecting unit external communication unit An identification signal for identifying the vehicle is transmitted to the management device via the control device, and a request signal returned from the management device in response to the identification signal is received via the external communication unit as a trigger. at a transmission timing, and transmits a stored content of the storage unit to the management device via the external communication unit as the event data,
In the storage unit, the event data is stored for each category corresponding to the detection device,
The in-vehicle network system , wherein the recording control device transmits the event data to the management device in a different category order depending on a type of the event . In the data storage process, the detection value is transmitted based on storage destination information indicating a storage destination of the detection value,
The in-vehicle network system according to claim 1, wherein an address of the recording control apparatus is specified as the storage destination in the storage destination information. The in-vehicle network is composed of a plurality of series networks having different protocols from each other,
The in-vehicle network system according to claim 1, wherein the recording control device is an electronic control device that performs gateway processing for relaying data communication between the affiliated networks. 4. The vehicle-mounted device according to claim 1 , wherein one of the event detection units is a collision detection unit that detects a collision of the vehicle as the event from an acceleration applied to the vehicle. 5. Network system. The types of events include sudden braking, sudden acceleration, and sudden steering of the vehicle in addition to the collision of the vehicle,
The recording control device transmits the event data to the management device in order of category having the highest priority based on an event data map in which the priority of the category is set in advance according to the type of the event. The in-vehicle network system according to any one of claims 1 to 4 .

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