Electronic control device and communication network system

Abstract

To provide an electronic control device capable of reducing the time required to receive information and complete setting of a parameter.SOLUTION: A first device 11, which is an electronic control device, is communicably connected to a providing electronic control device in a communication network system to which a plurality of electronic control devices mounted on a vehicle are connected. The providing electronic control device transmits information to other electronic control devices in the communication network system at predetermined intervals. Each time the first device 11 is activated, the first device resets parameters necessary for realizing a specific function based on the received information. At the time of activation, the first device 11 transmits a short notification requesting transmission of the information at a cycle shorter than a predetermined cycle to the providing electronic control device. The first device 11 authenticates the received information based on the information received from the providing electronic control device a plurality of times, and sets the parameter based on the information for which the authentication is completed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electronic control device and a communication network system. [Background technology]

[0002] A communication network system is described in Patent Document 1. This communication network system is mounted on a vehicle and is configured with a plurality of electronic control units that are capable of communicating with each other.

[0003] The electronic control devices included in the communication network system include a providing electronic control device that transmits information and a receiving electronic control device that receives the transmitted information. The receiving electronic control device sets parameters for realizing a specific function based on the received information. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-222052 Summary of the Invention [Problem to be solved by the invention]

[0005] It is desirable that the receiving electronic control unit can quickly obtain information from the providing electronic control unit and quickly complete parameter setting so that a specific function can be realized quickly. [Means for solving the problem]

[0006] An electronic control unit for solving the above problem is communicatively connected to a provider electronic control unit in a communication network system to which multiple electronic control units mounted on a vehicle are connected. The provider electronic control unit transmits information to other electronic control units in the communication network system at a predetermined period. Each time the electronic control unit is started up, it resets parameters required to realize a specific function based on the information. Upon startup, the electronic control unit transmits a shortened notification to the provider electronic control unit requesting that the information be transmitted at a period shorter than the predetermined period. The electronic control unit authenticates the received information based on the information received multiple times from the provider electronic control unit. The electronic control unit sets the parameters based on the information for which the authentication has been completed.

[0007] A communication network system for solving the above problem is a communication network system to which multiple electronic control units mounted on a vehicle are connected. This communication network system includes a providing electronic control unit that transmits information to other electronic control units in the communication network system at a predetermined period. This communication network system includes a receiving electronic control unit that is communicatively connected to the providing electronic control unit and that resets parameters required to realize a specific function based on the information each time the communication network system is started up. In this communication network system, the receiving electronic control unit, upon startup, transmits a shortened notification to the providing electronic control unit requesting that the information be transmitted at a period shorter than the predetermined period. In this communication network system, the receiving electronic control unit authenticates the received information based on the information received multiple times from the providing electronic control unit. In this communication network system, the receiving electronic control unit sets the parameters based on the authenticated information. In this communication network system, when the providing electronic control unit receives the shortened notification, it transmits the information at a period shorter than the predetermined period. [Effects of the Invention]

[0008] The electronic control unit described above can reduce the time it takes to receive information and complete parameter setting. Furthermore, the communication network system described above allows the receiving electronic control unit to quickly authenticate the information, thereby reducing the time it takes for the receiving electronic control unit to complete parameter setting. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a communication network system according to an embodiment. [Figure 2] FIG. 2 is a sequence diagram showing a state in which the activated first device receives vehicle information from a provider electronic control device in the communication network system of FIG. [Figure 3] FIG. 3 is a sequence diagram showing an aspect in which the first device sets parameters in the communication network system of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the electronic control device will be described below with reference to FIGS. <Configuration of communication network system 100> A communication network system 100 is mounted on a vehicle. As shown in Fig. 1, a plurality of electronic control units are connected to the communication network system 100. In Fig. 1, the electronic control units included in the communication network system 100 are represented by rectangles. Each of the plurality of electronic control units realizes a specific function in the vehicle.

[0011] As shown in Fig. 1, the communication network system 100 includes a first device 11, a second device 12, a third device 13, a fourth device 14, and a fifth device 15. As shown in Fig. 1, the first device 11, the second device 12, the third device 13, and the fourth device 14 are connected to each other so that they can communicate with each other. Also, as shown in Fig. 1, the first device 11 and the fifth device 15 are connected to each other so that they can communicate with each other. In the communication network system 100, electronic control devices communicate with other electronic control devices via a Controller Area Network (CAN). The communication protocol used by the electronic control devices in the communication network system 100 is not limited to CAN communication.

[0012] The communication network system 100 includes a provider electronic control device. The provider electronic control device transmits information to other electronic control devices in the communication network system 100 at a predetermined cycle. A second device 12, a third device 13, and a fourth device 14 are provider electronic control devices. The second device 12, the third device 13, and the fourth device 14 have their own cycles for transmitting information.

[0013] In the communication network system 100, the second device 12, the third device 13, and the fourth device 14, which are provider electronic control devices, transmit vehicle information to the other electronic control devices at predetermined intervals. The vehicle information is information related to the vehicle on which the communication network system 100 is installed. For example, the provider electronic control device transmits information indicating the types of vehicle components such as the engine and tires as the vehicle information. For example, the provider electronic control device transmits information on the weight of the vehicle as the vehicle information. For example, the provider electronic control device transmits information on the size of the vehicle as the vehicle information. The types of vehicle information transmitted by the second device 12, the third device 13, and the fourth device 14 are different from one another.

[0014] The communication network system 100 includes a receiving electronic control device. The receiving electronic control device is communicatively connected to a providing electronic control device. The first device 11 is the receiving electronic control device. In the communication network system 100, the first device 11 is, for example, an electronic control device that controls automatic driving by a vehicle.

[0015] The first device 11 realizes a plurality of specific functions. For example, the first device 11 controls the steering so that the vehicle during automatic driving can travel within the boundaries of the lane. The first device 11 also controls the brakes of the vehicle during automatic driving.

[0016] Each time the first device 11, which is the receiving electronic control device, is started up, it resets the parameters required to realize a specific function based on the information received from the providing electronic control device. The manner of control executed by first device 11 to realize a specific function varies by setting parameters according to the content of the received vehicle information. For example, when first device 11 receives vehicle size information from the providing electronic control unit as vehicle information, it adjusts the steering angle when turning right or left according to the vehicle size indicated by the vehicle information.

[0017] The first device 11 stores patterns of modes for realizing specific functions according to the content of the received vehicle information. For example, the first device 11 stores first to Nth patterns of steering control modes, and selects a pattern corresponding to the size of the vehicle indicated by the vehicle information. In the above example of steering control, setting parameters means setting variables related to the size of the vehicle required to select an appropriate pattern.

[0018] The first device 11 is communicably connected to a plurality of provider electronic control devices. Specifically, the first device 11 is communicably connected to three provider electronic control devices: a second device 12, a third device 13, and a fourth device 14.

[0019] When the first device 11 receives vehicle information from the provider electronic control device, it sets parameters for specific functions corresponding to the type of vehicle information received. For example, when the first device 11 receives vehicle size information as vehicle information from the second device 12, it sets parameters related to steering control during autonomous driving. Furthermore, when the first device 11 receives vehicle weight information as vehicle information from the third device 13 and information on the type of tires equipped on the vehicle from the fourth device 14, it sets parameters related to steering control during autonomous driving.

[0020] In addition, after the parameter setting is completed, the first device 11 periodically receives vehicle information from the second device 12, the third device 13, and the fourth device 14 while realizing a specific function.

[0021] The communication network system 100 includes a slave electronic control device. In the communication network system 100, the slave electronic control device is connected to a first device 11, which is a receiving electronic control device. Each time the slave electronic control device is started, the slave electronic control device receives the parameters set by the receiving electronic control device from the receiving electronic control device and reapplies the parameters to itself.

[0022] The fifth device 15 is a subordinate electronic control device. In the communication network system 100, the fifth device 15 receives the parameters set by the first device 11 and reapplies them to itself every time it is started up. As a result, the fifth device 15 performs control in a manner according to the applied parameters.

[0023] In the communication network system 100, the fifth device 15 is, for example, an electronic control device that assists the first device 11 in controlling the vehicle during autonomous driving. For example, the fifth device 15 performs image processing on images captured by a camera equipped in the vehicle. Then, the first device 11 controls the vehicle based on the results of the image processing by the fifth device 15. The number of cameras mounted on the vehicle and the mounting positions of the cameras vary depending on the size of the vehicle. Therefore, the fifth device 15 needs to perform image processing suited to the size of the vehicle. Therefore, the fifth device 15 receives parameters from the first device 11 and applies the parameters. This allows the fifth device 15 to perform image processing suited to the size of the vehicle.

[0024] <Communication Mode When First Device 11 is Activated> 2 shows the manner of communication that is performed between the first device 11 and the provider electronic control device when the first device 11 is started up. The first device 11 communicates with the second device 12, the third device 13, and the fourth device 14 in the manner shown in FIG.

[0025] As shown in the upper part of FIG. 2, the first device 11 is activated when the ignition switch of the vehicle is turned on and the ignition is turned on (IG-ON). As shown in the upper part of Figure 2, the first device 11 initializes a reception completion flag after startup. As will be described later, after receiving information from the providing electronic control device, the first device 11 becomes able to use the information for parameter setting when authentication of the received information is completed. The reception completion flag is a flag that indicates whether information has been received from the providing electronic control device and the received information is ready for use in parameter setting. The first device 11 manages a reception completion flag for each of communication with the second device 12, communication with the third device 13, and communication with the fourth device 14.

[0026] The reception completion flag is initialized when the reception completion flag indicates zero. When the reception completion flag indicates zero, the reception completion flag indicates that the first device 11 is not yet available for parameter setting for the information transmitted by the providing electronic control unit. For example, if the first device 11 has not received vehicle information from the second device 12 after startup, the reception completion flag for communication with the second device 12 is zero. If authentication of the information received from the second device 12 has not been completed, the reception completion flag for communication with the second device 12 is also zero.

[0027] The first device 11 receives information from the providing electronic control unit, and when the received information becomes available for parameter setting, the first device 11 switches the reception completion flag from 0 to 1. Specifically, after the first device 11 starts up, it receives vehicle information from the second device 12, and when authentication of the received information is completed, the reception completion flag for the second device 12 becomes 1.

[0028] <Communication Mode When First Device 11 Executes Destination Selection Process> 2, the first device 11 initializes the reception completion flag and then executes a destination selection process. In the destination selection process, the first device 11 selects a providing electronic control device to which a shortened notification is to be sent. The shortened notification is a notification that requests the providing electronic control device to transmit information at a shorter interval than a predetermined interval.

[0029] As described above, the information transmission cycles of the second device 12, the third device 13, and the fourth device 14, which are the providing electronic control devices, are individually determined. Some providing electronic control devices may not be able to shorten the information transmission cycle even if they receive a shortening notification. For example, if a providing electronic control device shortens the vehicle information transmission cycle and there is a possibility that the transmitted vehicle information may collide with messages transmitted by other electronic control devices, the information transmission cycle cannot be shortened.

[0030] In the destination selection process, the first device 11 selects, from among a plurality of providing electronic control devices, a providing electronic control device that can transmit information at a shorter cycle than the cycle predetermined for each providing electronic control device. The first device 11 stores data on providing electronic control devices that can afford to shorten the cycle for transmitting vehicle information among the second device 12, the third device 13, and the fourth device 14. In the destination selection process, the first device 11 refers to the data to select a providing electronic control device to which the shortened notification will be transmitted.

[0031] As shown in Fig. 2, the communication mode changes depending on whether the provider electronic control device of the other party in the communication is selected as the destination of the shortened notification in the destination selection process. The middle part of Fig. 2 shows the communication mode when the provider electronic control device of the other party in the communication is selected as the destination of the shortened notification. On the other hand, the bottom part of Fig. 2 shows the communication mode when the provider electronic control device of the other party in the communication is not selected as the destination of the shortened notification.

[0032] As shown in the middle part of Fig. 2, when the providing-side electronic control device of the other party in the communication is selected as the destination of the shortened notification, the first device 11 transmits the shortened notification to the providing-side electronic control device. On the other hand, as shown in the bottom part of Fig. 2, when the providing-side electronic control device of the other party in the communication is not selected as the destination of the shortened notification, the shortened notification is not transmitted.

[0033] In this way, the first device 11 transmits the shortened notification to the providing electronic control device at the time of startup. At this time, the first device 11 selects the providing electronic control device to which the shortened notification is to be transmitted, and then transmits the shortened notification to the selected providing electronic control device.

[0034] 2, the providing-side electronic control unit executes a transmission cycle shortening process upon receiving the shortening notification from the first device 11. In the transmission cycle shortening process, the providing-side electronic control unit shortens the cycle for transmitting vehicle information.

[0035] A provider electronic control device that can shorten the information transmission period has a predetermined period for responding to a shortened notification in addition to a period for a normal state in which the shortened notification is not received. The period for responding to a shortened notification is shorter than the period for the normal state. The period for responding to a shortened notification is individually determined for each provider electronic control device, similar to the period for the normal state.

[0036] The providing electronic control unit, which can shorten the period for transmitting information, stores a period for responding to the shortened notification in addition to the period for the normal state when the shortened notification is not received. In the transmission period shortening process, the providing electronic control unit switches the period for transmitting the vehicle information from the period for the normal state to the period for responding to the shortened notification.

[0037] 2, the providing electronic control unit executes the transmission cycle shortening process and then transmits the vehicle information at a cycle corresponding to the shortened notification. In this way, when the providing electronic control unit receives the shortened notification, it transmits the information at a cycle shorter than the predetermined cycle.

[0038] As shown in the lower part of Fig. 2, if a provider electronic control unit is not selected as a destination of the shortened notification in the destination selection process, the shortened notification is not transmitted, and therefore the period for transmitting the vehicle information is not shortened. Therefore, in the lower part of Fig. 2, the provider electronic control unit that is not selected as a destination of the shortened notification transmits the vehicle information at a normal period.

[0039] <Communication Mode When First Device 11 Authenticates Vehicle Information> As shown in the middle and bottom rows of Fig. 2, the first device 11 executes the vehicle information authentication process when it receives vehicle information from the provider electronic control device a predetermined number of times after startup. The vehicle information authentication process is executed regardless of whether the first device 11 is selected as a destination of the abbreviated notification. The predetermined number of times is 2 or more.

[0040] In the vehicle information authentication process, the first device 11 authenticates the vehicle information received from the provider electronic control device. The first device 11 executes the vehicle information authentication process for each of the provider electronic control devices, that is, the second device 12, the third device 13, and the fourth device 14. For example, when the first device 11 receives vehicle information from the second device 12 a predetermined number of times, the first device 11 executes the vehicle information authentication process for the second device 12. Note that the predetermined number of times may be set uniformly for all provider electronic control devices, or may be set for each provider electronic control device.

[0041] In the vehicle information authentication process, the first device 11 authenticates the received information based on the information received multiple times from the providing electronic control device. For example, the first device 11 checks whether the vehicle information received multiple times from the providing electronic control device is the same. Then, when the first device 11 checks that the vehicle information received multiple times is the same, it authenticates the received vehicle information as having been transmitted properly.

[0042] 2, the first device 11 executes the vehicle information authentication process, and after completing the authentication of the vehicle information, switches the reception completion flag for the provider electronic control device that transmitted the authenticated vehicle information from 0 to 1. This process is executed, similar to the vehicle information authentication process, regardless of whether the provider electronic control device has been selected as a destination of the abbreviated notification.

[0043] As shown in the middle of Figure 2, after switching the reception completion flag, the first device 11 transmits a restoration notification to the providing electronic control device corresponding to the reception completion flag. The restoration notification is a notification requesting that the period at which the providing electronic control device transmits information be restored to a predetermined period. After completing authentication, the first device 11 transmits a restoration notification to the providing electronic control device that transmitted the authenticated information. Note that, as shown in the bottom of Figure 2, the restoration notification is not transmitted to providing electronic control devices that have not received the shortened notification.

[0044] As shown in the middle part of Fig. 2, the providing electronic control unit that has received the restoration notification cancels the shortened cycle for transmitting the vehicle information. At this time, the providing electronic control unit switches the cycle for transmitting the vehicle information from the cycle for responding to the shortened notification to the normal cycle.

[0045] <Communication Mode When First Device 11 Sets Parameters> FIG. 3 shows a state of communication between first device 11 and fifth device 15 when first device 11 sets parameters based on vehicle information.

[0046] As shown in FIG. 3, the first device 11 sets parameters when the collection of vehicle information is completed. As described above, when the first device 11 receives vehicle information, it sets parameters for a specific function corresponding to the received vehicle information. The first device 11 determines that the collection of vehicle information is completed when the reception completion flags for all provider electronic control devices that transmit vehicle information necessary to realize a specific function are switched from zero to one. For example, the first device 11 determines that the collection of vehicle information for steering control during autonomous driving is completed when the reception completion flag for the second device 12 that transmits vehicle information indicating the size of the vehicle is switched from zero to one. In this way, the first device 11 and the fifth device 15 perform communication in the manner shown in FIG. 3 for each specific function realized by the first device 11.

[0047] 3, first device 11 sets parameters by selecting a pattern for realizing a specific function according to the content of the vehicle information. At this time, first device 11 sets parameters for the specific function corresponding to the type of vehicle information that has been collected. In this way, first device 11 sets parameters based on information that has been authenticated.

[0048] 3, after completing the parameter setting, the first device 11 transmits the set parameters to the fifth device 15, which is a slave electronic control device. Then, the fifth device 15, which has received the parameters, applies the received parameters to itself.

[0049] <Operation of this embodiment> The first device 11, which is an electronic control device, increases the frequency of receiving information by shortening the cycle at which the providing electronic control device transmits information.

[0050] <Effects of this embodiment> (1) The first device 11, which is an electronic control device, can reduce the time it takes to receive information and complete parameter setting.

[0051] (2) The first device 11, which is an electronic control device, is communicatively connected to a plurality of providing electronic control devices. From among the plurality of providing electronic control devices, the first device 11 selects a providing electronic control device that can transmit information at a shorter period than the period predetermined for each providing electronic control device. The first device 11 transmits a shortened notification to the selected providing electronic control device.

[0052] Among the providing electronic control devices, there may be some that cannot shorten the information transmission cycle even if they receive a shortening notification. The first device 11, which is an electronic control device, selects a providing electronic control device that can shorten the cycle from among the providing electronic control devices and then transmits a shortening notification. This allows the first device 11 to prevent the sending of a shortening notification to a providing electronic control device that cannot shorten the cycle, thereby reducing the amount of communication in the communication network system 100.

[0053] (3) After completing authentication, the first device 11, which is an electronic control device, sends a restoration notification to the providing electronic control device that sent the authenticated information, requesting that the information transmission cycle be restored to a predetermined cycle.

[0054] The first device 11, which is an electronic control device, transmits a restoration notification to the providing electronic control device that is transmitting the authenticated information. This allows the first device 11 to cause the providing electronic control device to restore the shortened cycle to its original state. After the parameter setting is complete, the frequency of transmitting vehicle information can be reduced, thereby suppressing the amount of communication.

[0055] (4) In the communication network system 100, the first device 11, which is an electronic control device, is connected to a subordinate electronic control device that receives parameters set by the first device 11 from the first device 11 and reapplies the parameters to itself every time the first device 11 is started. After completing the parameter setting, the first device 11 transmits the set parameters to the subordinate electronic control device.

[0056] In the communication network system 100, the slave electronic control device applies the parameters set by the first device 11, which is an electronic control device, to itself. The first device 11 can set the parameters quickly by receiving the shortened notification. Therefore, the first device 11 can shorten the time until the slave electronic control device applies the parameters.

[0057] (5) The communication network system 100 shortens the period in which the providing electronic control unit transmits information, thereby enabling the receiving electronic control unit to receive the information more quickly. This allows the communication network system 100 to have the receiving electronic control unit authenticate the information more quickly, thereby shortening the time it takes for the receiving electronic control unit to complete parameter setting.

[0058] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0059] In the above-described communication network system 100, the providing electronic control unit periodically transmits vehicle information. The information periodically transmitted by the providing electronic control unit is not limited to vehicle information. For example, the providing electronic control unit may periodically transmit position information, and the receiving electronic control unit may determine the country based on the position information and set parameters based on the determined country information.

[0060] The number of receiving electronic control devices, providing electronic control devices, and subordinate electronic control devices included in the communication network system 100 is not limited to the above embodiment. For example, in the communication network system 100, the receiving electronic control device may be connected to multiple subordinate electronic control devices.

[0061] Furthermore, the topology of the communication network system 100 is not limited to the above embodiment. For example, the slave electronic control unit may be directly connected to the provider electronic control unit so as to be able to communicate with it.

[0062] In the above-described communication network system 100, the receiving electronic control unit receives vehicle information from the providing electronic control unit not only when it starts up and sets parameters, but also after the parameters are set and while it is realizing a specific function.

[0063] The receiving electronic control unit may not receive vehicle information from the providing electronic control unit while realizing a specific function. In other words, for example, the receiving electronic control unit may receive vehicle information only when setting parameters, and the providing electronic control unit may transmit vehicle information to electronic control units other than the receiving electronic control unit at times other than when the receiving electronic control unit is started.

[0064] In the above-described communication network system 100, the first device 11 can realize a plurality of specific functions. The first device 11 receives vehicle information from a plurality of providing-side electronic control units and sets parameters for the specific functions corresponding to the types of vehicle information received.

[0065] On the other hand, the first device 11 may be an electronic control device that realizes only one specific function. In this case, the first device 11 sets parameters for the one specific function based on the vehicle information received from all connected providing electronic control devices.

[0066] In the above-described communication network system 100, the providing electronic control unit that has received the shortened notification shortens the period for transmitting vehicle information by switching to a predetermined period that corresponds to the shortened notification. However, the manner in which the providing electronic control unit that has received the shortened notification shortens the period is not limited to the above-described embodiment. For example, the providing electronic control unit may shorten the period by receiving a notification indicating the shortened period at the same time as the shortened notification and applying the period indicated in the notification.

[0067] In the above-described communication network system 100, the types of vehicle information transmitted by second device 12, third device 13, and fourth device 14 are different from one another. On the other hand, the types of vehicle information transmitted by second device 12, third device 13, and fourth device 14 may be the same.

[0068] In the above-described communication network system 100, the receiving electronic control device is communicatively connected to a plurality of providing electronic control devices. On the other hand, the receiving electronic control device may be communicatively connected to one providing electronic control device.

[0069] In the above-described communication network system 100, the receiving electronic control device selects a providing electronic control device to which the shortened notification is to be sent, and then transmits the shortened notification to the selected providing electronic control device. The receiving electronic control device does not have to select a providing electronic control device to which the shortened notification is to be sent. For example, the receiving electronic control device may transmit the shortened notification to all providing electronic control devices without selecting a destination of the shortened notification.

[0070] In the above-described communication network system 100, the receiving electronic control unit transmits a restoration notification to the providing electronic control unit after completing the authentication of the vehicle information. The receiving electronic control unit does not have to transmit the restoration notification.

[0071] The above-described communication network system 100 includes a dependent electronic control unit. The communication network system 100 does not necessarily have to include a dependent electronic control unit. [Explanation of symbols]

[0072] 11...first device, 12...second device, 13...third device, 14...fourth device, 15...fifth device, 100...communication network system

Claims

1. In a communication network system to which a plurality of electronic control units mounted on a vehicle are connected, the electronic control units are communicably connected to a provider electronic control unit that transmits information to other electronic control units in the communication network system at a predetermined cycle, an electronic control device that resets parameters necessary to realize a specific function based on the information each time the electronic control device is started; At the time of startup, a shortened notification is transmitted to the providing electronic control unit, requesting that the providing electronic control unit transmit the information at a cycle shorter than the predetermined cycle; Authenticating the received information based on the information received multiple times from the providing electronic control unit; The parameters are set based on the authenticated information. Electronic control unit.

2. A communication device is connected to a plurality of the provider electronic control devices, selecting a providing electronic control unit that can transmit the information at a cycle shorter than the cycle predetermined for each providing electronic control unit from among the plurality of providing electronic control units; The shortened notification is transmitted to the selected provider electronic control unit. The electronic control device according to claim 1 .

3. After the authentication is completed, a restoration notification is sent to the providing electronic control unit that transmitted the authenticated information, requesting that the period for transmitting the information be restored to the predetermined period. The electronic control device according to claim 1 or 2.

4. In the communication network system, a slave electronic control device is connected, which receives the parameters set by the electronic control device from the electronic control device and reapplies the parameters to itself every time the slave electronic control device is started up, After the parameter setting is completed, the set parameters are transmitted to the slave electronic control unit. The electronic control device according to claim 1 or 2.

5. A communication network system in which a plurality of electronic control units mounted on a vehicle are connected, a provider electronic control unit that transmits information to other electronic control units in the communication network system at a predetermined cycle; a receiving-side electronic control device that is communicably connected to the providing-side electronic control device and that resets parameters required to realize a specific function based on the information each time the receiving-side electronic control device is started up; The receiving electronic control device is At the time of startup, a shortened notification is transmitted to the providing electronic control unit, requesting that the providing electronic control unit transmit the information at a cycle shorter than the predetermined cycle; Authenticating the received information based on the information received multiple times from the providing electronic control unit; setting the parameters based on the authenticated information; The provider electronic control device includes: When the shortened notification is received, the information is transmitted at a cycle shorter than the predetermined cycle. Communication network system.

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