JP2012177562A - Connection inspection method of on-vehicle lan system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that connection information of an electronic control unit connected to a network environment, which is stored in a non-volatile memory (EEPROM), cannot be erased.SOLUTION: An electronic control apparatus reads connection information of an electronic control unit connected to a network environment. Predetermined information is stored in a first memory unit (RAM) and a second memory unit (EEPROM) of the electronic control apparatus. When the predetermined information is stored in the first memory unit, the connection information is not read and a content in the second memory unit is retained.

Description

  The present invention relates to a connection inspection method for an in-vehicle LAN system in which an electronic control device realizes a predetermined function based on information obtained from an electronic control unit connected to an in-vehicle network environment.

  In an in-vehicle LAN system in which an electronic control device performs a predetermined function based on information obtained from an electronic control unit connected to an in-vehicle network environment, whether there is an abnormality in the system is as early as possible in manufacturing. Since it is necessary to find and solve the problem, it is necessary to check that the predetermined electronic control unit is securely connected at the time of shipment of the electronic control device or the vehicle. In addition, it is necessary to be able to inspect whether or not a predetermined electronic control unit is securely connected after the vehicle is shipped when the electronic control unit is replaced due to an accident or failure or when the battery is replaced. There is.

  This connection inspection is, for example, incorporated in an electronic control device using a technique (Patent Document 1) that stores vehicle-specific vehicle-specific information in a nonvolatile memory (hereinafter referred to as EEPROM (Electrically Erasable Programmable Read Only Memory)). A unique ID (hereinafter referred to as a unit ID) assigned to the electronic control unit to be connected to the in-vehicle network environment is stored in advance in the EEPROM, and the stored unit ID and the in-vehicle LAN are actually stored. This can be done by comparing the unit ID of the electronic control unit connected to.

Japanese Patent No. 3758356

  However, the types and number of electronic control units connected to the in-vehicle network environment vary depending on the type of vehicle and vehicle specifications, and the number of types of electronic control units is also large. However, a method that can be performed efficiently has been desired.

  However, the present condition is that the proposal of the inspection method along such a request is not made | formed.

  The in-vehicle LAN system connection inspection includes a stage where the electronic control device is completed (hereinafter referred to as a first step), a stage where the electronic control device is mounted on the vehicle (hereinafter referred to as a second step), and after the vehicle is shipped (hereinafter referred to as the first step). It is desirable to be performed in three stages (referred to as three steps).

  In the inspection of the first step, the unit ID of the electronic control unit connected to the electronic control device is stored in advance in the EEPROM in the electronic control device, and the electronic control device is output from each electronic control unit. The unit ID is received, the received unit ID is compared with the unit ID stored in the EEPROM, and it is checked that the predetermined electronic control unit is connected to the in-vehicle network environment. When there is no problem in the inspection, the unit ID stored in the EEPROM is cleared.

  Next, in the second step inspection, the electronic control unit actually mounted on the vehicle is connected, the electronic control device acquires the unit ID connected to the vehicle-mounted network environment, and the acquired unit ID is stored in the EEPROM. The vehicle is shipped.

  Here, in order to perform the inspection in the second step, whenever the electronic control device receives a signal sent from the electronic control unit to the in-vehicle network environment, the unit ID included in the received signal can be stored in the EEPROM. Must be configured.

  However, according to the configuration, it is necessary to stop sending the unit ID from the electronic control unit after the inspection in the first step and before clearing the unit ID stored in the EEPROM. Otherwise, after the unit ID stored in the EEPROM is cleared, the unit ID flowing through the in-vehicle network environment is stored in the EEPROM again.

  On the other hand, it is very troublesome to stop sending the unit ID every time the inspection of the first step is completed and then clear the unit ID stored in the EEPROM. This is not desirable.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an inspection method capable of efficiently performing a connection inspection between an electronic control device and an electronic control unit connected to an in-vehicle network environment.

  The in-vehicle LAN system connection inspection method according to the present invention efficiently performs the connection inspection between the electronic control device and the electronic control unit in the in-vehicle LAN system.

  That is, a connection inspection method for an in-vehicle LAN system according to claim 1 of the present invention is applied to a network environment configured by an in-vehicle LAN installed in a vehicle or an inspection LAN imitating an in-vehicle LAN, and a network environment. The stored contents are retained while connected and powered, and the stored contents are retained regardless of the power supply state, and a first storage unit that erases the stored contents when power is not supplied A second storage unit, and an electronic control device that performs a predetermined function based on information flowing in the network environment, and is connected to the network environment and outputs information necessary for operating the electronic control device An in-vehicle LAN system comprising at least one electronic control unit and a power supply unit that supplies power to the network environment, the electronic control device, and the electronic control unit In this connection method, the electronic control device is connected to the network environment when the first flag of the first storage unit is not raised. Detecting the type of the electronic control unit, and when the electronic control device detects the type of the electronic control unit connected to the network environment, sets a predetermined first flag in the first storage unit A step of setting a second flag corresponding to a type of the electronic control unit connected to the network environment in the second storage unit; a type of the electronic control unit connected to the network environment detected by the electronic control device; The electronic control device determines that the connection state of the electronic control unit to the network environment is normal when the state of the second flag is equal; When the flag is set, the step of not detecting the type of the electronic control unit connected to the network environment, the step of erasing the second flag, the supply of power from the power supply unit are stopped, And a step of erasing one flag.

  According to the connection inspection method for the in-vehicle LAN system configured as described above, the type of the electronic control unit connected to the network environment is detected when the first flag is not set in the first storage unit of the electronic control device. The second flag corresponding to the detected type of the electronic control unit is stored in the second storage unit of the electronic control device, and the predetermined first flag is set in the first storage unit. It is done. Then, when the type of the electronic control unit connected to the network environment detected by the electronic control device is equal to the state of the second flag, it is determined that the connection state of the electronic control unit to the network environment is normal. The Further, when the predetermined first flag is set, the electronic control device does not detect the type of the electronic control unit connected to the network environment, so the electronic control unit is connected to the network environment and the electronic control unit is connected to the electronic control unit. Even when information indicating the type of the control unit is flowing in the network environment, the state in which the second flag is cleared can be maintained, and thereby the inspection from the first step to the second step can be maintained. Therefore, the connection inspection of the electronic control unit in the in-vehicle LAN system can be efficiently performed.

  Further, in the in-vehicle LAN system connection inspection method according to claim 2 of the present invention, all electronic control units that may be connected to the electronic control device are connected instead of the electronic control unit. The method includes a step of connecting a pseudo signal generating means for outputting information representing an equivalent state to a network environment.

  According to the connection inspection method for the in-vehicle LAN system configured as described above, since the pseudo signal generating means is connected to the network environment, it is the most complicated that all electronic control units that may be connected are connected. Therefore, it is possible to efficiently perform the connection inspection of the electronic control unit in the in-vehicle LAN system.

  According to the in-vehicle LAN system connection inspection method according to the present invention, it is possible to efficiently perform the connection inspection between the electronic control device and the electronic control unit connected to the in-vehicle network environment.

It is a block diagram which shows the general structure of the vehicle-mounted electronic control apparatus to which the connection test method of the vehicle-mounted LAN system which concerns on this invention is applied. It is a 1st block diagram which shows the specific structure of the vehicle-mounted electronic control apparatus to which the connection test method of the vehicle-mounted LAN system which concerns on Example 1 of this invention is applied. It is a 2nd block diagram which shows the specific structure of the vehicle-mounted electronic control apparatus to which the connection test method of the vehicle-mounted LAN system which concerns on Example 1 of this invention is applied. It is a flowchart explaining the flow of the connection test | inspection method in the vehicle-mounted LAN system of FIG. 2, FIG.

  Hereinafter, an embodiment of a connection inspection method for an in-vehicle LAN system according to the present invention will be described with reference to the drawings.

  In the first embodiment, the present invention is applied to an inspection of an electronic control device connected to a network environment (in-vehicle LAN) disposed in a vehicle. Embodiments of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, this apparatus is mainly arranged in a vehicle (not shown in FIG. 1, FIG. 2, FIG. 3), which constitutes a network environment, and is connected to the LAN 10 and has a predetermined The first electronic control unit 20, the second electronic control unit 30, the third electronic control unit 40, and the information that flows through the LAN 10 An electronic control device 50 that performs a predetermined function, a CPU 60 that is installed inside the electronic control device 50 and performs predetermined arithmetic processing, and performs a storage operation only when power is supplied from the power supply unit 100, The first storage unit 70 is composed of a RAM used for storing the information acquired from other electronic control units, etc. Regardless of the power supply state, the storage operation is performed, and the second storage unit 80 composed of the EEPROM used for storing the initial setting value of the arithmetic processing and the necessary constants, the LAN 10, and each electronic control unit (20, 30, 40), and a power supply unit 100 that supplies power to the electronic control device 50.

  The first embodiment relates to an inspection method for the electronic control device 50. That is, an inspection that each electronic control unit (20, 30, 40) is securely connected to the electronic control device 50 via the LAN 10, and an inspection that there is no problem in the operation of the electronic control device 50. Is to do.

  In FIG. 1, three electronic control units (20, 30, 40) are connected to the LAN 10, but this is not limited to three, and the necessary electronic control units depend on the configured system. The number of fluctuates.

  FIG. 2 shows a specific configuration example of FIG. In other words, a meter that is mounted on a vehicle and displays vehicle information such as the vehicle speed, the engine speed, and the operating state of the constant speed traveling device, or displays warning information when an abnormality occurs in the vehicle state is configured. An electronic control device is illustrated.

  The configuration of FIG. 2 will be described. As a specific configuration example of the LAN 10, the CAN 15 having a CAN (Car Area Network) protocol and transmitting and receiving information between the units connected thereto controls the automatic transmission. AT control unit 25 (corresponding to the first electronic control unit 20), cruise control unit 35 (corresponding to the second electronic control unit 30) that controls the constant speed running function, skid prevention function and anti-lock brake function ABS control unit 45 (corresponding to the third electronic control unit 40) that controls the meter, meter control unit 55 (corresponding to the electronic control device 50) that controls the display function of the meter, CAN 15, and each electronic control unit (25, 35, 45), meter control unit 5 5 is connected to a power supply unit 100 that supplies power.

  Further, inside the meter control unit 55, a meter or warning light that displays vehicle information by arithmetic processing based on information transmitted from each electronic control unit (25, 35, 45) via the CAN 15. The CPU 60 that determines the display state of the meter 90 and the display state of the warning light and the progress of arithmetic processing that determines the information to be output to the meter 90 and the storage and reading of information acquired from other electronic control units are possible. Thus, the RAM 75 that constitutes the first storage unit 70 that can hold the stored contents only while the power is supplied from the power supply unit 100, and the initial setting of the arithmetic processing that determines the information to be output to the meter 90 Values, necessary constants, etc. are stored, and new information can be written, regardless of the power supply state from the power supply unit 100. It can hold the stored contents, and EEPROM85 constituting the second storage unit 80 is provided.

  The inspection performed in the first embodiment includes a total of three steps.

  The inspection of the first step is performed at the factory where the meter control unit 55 is manufactured, in the configuration shown in FIG. 3, that is, instead of the AT control unit 25, the cruise control unit 35, and the ABS control unit 45, Including a pseudo signal generator 52, which is a pseudo signal generating means capable of reproducing a state equivalent to the connection of all electronic control units that may be connected to the meter control unit 55. It is an inspection to be performed.

  The inspection using the pseudo signal generator 52 in this way is because the type of the electronic control unit connected to the meter control unit 55 differs depending on the vehicle, so what kind of electronic control unit is finally connected. This is because I don't know. On the other hand, the meter control unit 55 is manufactured so as to operate normally even in a state where all assumed electronic control units are connected. The inspection is performed with a simple configuration.

  Note that the inspection in the first step does not have to be performed in a vehicle-mounted state, and the CAN 15 may be an inspection CAN constructed on a table.

  The inspection in the second step is an inspection performed by the configuration of FIG. 2 in a factory that manufactures the vehicle. That is, as an example of an electronic control unit that is actually mounted on a vehicle after the pseudo signal generator 52 is removed, for example, in a state where the AT control unit 25, the cruise control unit 35, and the ABS control unit 45 are connected. It is an inspection to be performed.

  The inspection in the third step is an inspection performed by the configuration of FIG. 2 after the vehicle is shipped. However, the customer is not aware of the inspection, and the inspection is automatically performed every time the engine is started.

  Hereinafter, the inspection method from the first step to the third step of the in-vehicle LAN system according to the first embodiment will be described based on the flowchart of FIG.

  First, the flow of inspection in the first step will be described.

  First, in step S2, it is determined whether or not the pseudo signal generator 52 is connected. The pseudo signal generator 52 is a signal generator that can send a pseudo signal indicating that all electronic control units that may be connected to the CAN 15 are connected to the CAN 15. That is, the pseudo signal sent from the pseudo signal generator 52 includes a unit ID assigned to all electronic control units that may be connected to the CAN 15.

  The connection of such a pseudo signal generator 52 is different because the types of electronic control units connected by the vehicle are different, so that all variations are individually inspected, which requires a great deal of labor and time. This is because, in order to increase the inspection efficiency, the configuration shown in FIG.

  If it is determined that the pseudo signal generator 52 is connected, a second flag indicating that all electronic control units are connected is set at a predetermined address in the EEPROM 85 in step S3.

  The second flag is output from the pseudo signal generator 52 to the meter control unit 55 in an area of the number of bits corresponding to the maximum number of electronic control units that can be connected to the CAN 15, which is secured at a predetermined address of the EEPROM 85. When the unit ID is detected from the received pseudo signal, “1” is stored in the bit corresponding to the detected electronic control unit, and “0” is stored when the unit ID is not detected. ing. That is, in the case of the first embodiment, “1” is stored in all reserved bits.

  A first flag described later is “1” when a unit ID is detected from a pseudo signal output from the pseudo signal generator 52 and received by the meter control unit 55 at a predetermined address in the RAM 75. Is stored, and when the unit ID is not detected, “0” is stored.

  Next, in step S <b> 8, the meter control unit 55 receives a pseudo signal flowing through the CAN 15.

  When the unit ID included in the received pseudo signal matches the state of the second flag stored in the predetermined address of the EEPROM 85 in step S3, all the electronic control units are correctly It is judged that it is connected to CAN15.

  On the other hand, if the unit ID included in the received pseudo signal is different from the content of the second flag in step S8, there is a problem with the connection of the electronic control unit. A display indicating an abnormality is made. The inspector investigates the cause of the abnormality and takes countermeasures based on the abnormality display.

  When the unit ID included in the received pseudo signal is equal to the state of the second flag in step S8, the operation of the meter control unit 55 is confirmed in step S9. Here, for example, a predetermined vehicle speed signal may be sent from the pseudo signal generator 52 to the CAN to confirm that the speedometer of the meter 90 indicates the predetermined vehicle speed, or connected to the meter control unit 55 through the CAN 15. Assuming that all the electronic control units are connected, a predetermined signal is sent from the pseudo signal generator 52 to the CAN, and the indicator of the meter 90 corresponding to the signal is turned on. This may be done by checking whether or not.

  If it is confirmed in step S9 that the meter 90 operates normally, the process returns to step S4.

  On the other hand, when there is an abnormality in the operation of the meter control unit 55 in step S9, the process proceeds to step S10, and a display indicating the abnormality is made on the indicator of the meter 90. The inspector investigates the cause of the abnormality and takes countermeasures based on the abnormality display.

  When the inspection is completed to a point where the break is good, or when the inspection is completed, a predetermined signal is sent from the pseudo signal generator 52 to the CAN. This predetermined signal may be sent automatically upon detection that the examination has been completed to a point where the break is good, or when all the examinations have been completed, or may be sent by the operation of the inspector.

  In step S11, when the CPU 60 receives the predetermined signal, or when it is detected that the pseudo signal generator 52 has been removed from the CAN 15, the content of the second flag is cleared in step S12.

  In step S11, when a predetermined signal is not detected, or when removal of the pseudo signal generator is not detected, the process proceeds to step S4.

  After step S12, it is confirmed in step S13 that the second flag has been cleared. When it is confirmed that the second flag is cleared, the process proceeds to step S4. If the second flag is not cleared due to an internal failure or the like of the meter control unit 55, the process proceeds to step S10, and a display indicating an abnormality is made on the indicator of the meter 90. The inspector investigates the cause of the abnormality and takes countermeasures based on the abnormality display.

  Next, in step S <b> 4, it is confirmed that power is supplied from the power supply unit 100 to the meter control unit 55. This is a process for determining whether or not the inspection in the first step has been completed and the inspector has stopped supplying power from the power supply unit 100.

  If it is determined in step S4 that power is not supplied, the first flag is cleared in step S5, and the inspection in the first step is terminated in step S6. Actually, when the power supply from the power supply unit 100 is stopped, the stored contents of the RAM 75 are cleared without being held, so the contents of the first flag stored in the RAM 75 are automatically cleared.

  On the other hand, if it is determined in step S4 that power is supplied, the process proceeds to step S7, and it is determined whether or not the second flag is set.

  Here, when the process proceeds from step S11 to step S4, since some information is stored in the second flag, the process proceeds to step S8, and thereafter, the process described above is repeated.

  On the other hand, when the process proceeds from step S13 to step S4, the process proceeds to step S14 because the second flag is cleared.

  In step S14, it is determined whether or not the first flag is set at a predetermined address in the RAM 75.

  If it is determined that the first flag is set, the process proceeds to step S9. Thereafter, the process described above is repeated.

  Here, when it is determined in step S14 that the first flag is set, the meter control unit 55 does not receive the pseudo signal output from the pseudo signal generator 52 to the CAN 15 and proceeds to step S9. It is a feature of the present invention to migrate.

  That is, by having this feature, when it is determined that the first flag is set, no information is written in the second flag, and thus, when a pseudo signal is flowing through the CAN 15. Even if it exists, it becomes possible to hold | maintain the state in which the 2nd flag was cleared.

  On the other hand, when it is determined in step S14 that the first flag is not set, the process proceeds to step S15.

  In step S15, the meter control unit 55 receives a pseudo signal flowing through the CAN 15, and a unit ID is detected from the received pseudo signal.

  Thereafter, in step S16, a predetermined value indicating that the unit ID is detected is written in a pseudo signal output from the pseudo signal generator 52 and received by the meter control unit 55 at a predetermined address in the RAM 75. To set the first flag.

  In step S17, a second flag corresponding to the unit ID detected in step S15 is set at a predetermined address in the EEPROM 85. Thereafter, the process proceeds to step S9, and the process described above is repeated.

  When all the inspections are completed, the meter control unit 55 is delivered to a factory for assembling the vehicle.

  Next, the flow of inspection in the second step will be described. As shown in FIG. 2, the inspection in the second step is performed in a state where an electronic control unit (25, 35, 45) actually mounted on the vehicle is connected instead of the pseudo signal generator 52.

  In the first embodiment, an AT control unit 25 that controls an automatic transmission, a cruise control unit 35 that controls a constant speed running function, and an ABS control unit 45 that controls a skid prevention function and an antilock brake function are provided. Shall be connected.

  The inspection in the second step starts from determining whether or not the pseudo signal generator 52 is connected in step S2. Since the pseudo signal generator 52 is not connected when performing the inspection of the second step, the process proceeds to step S4.

  Next, in step S <b> 4, it is determined whether power is supplied from the power supply unit 100 to the meter control unit 55. Then, when the power is supplied, the process proceeds to step S7.

  In step S7, it is determined whether or not the second flag is set at a predetermined address in the EEPROM 85. In the case of the first embodiment, since the second flag is cleared at the time when the inspection of the first step described above is completed, it is determined in step S7 that the second flag is not set, and the step The process proceeds to S14.

  Next, in step S14, it is determined whether or not the first flag is set. In the inspection of the first step, since the first flag in the RAM 75 is cleared by stopping the power supply from the power supply unit 100, it is determined that the first flag is not set, and step S15 Migrate to

  Next, in step S15, the meter control unit 55 receives a signal sent from each electronic control unit (25, 35, 45) to the CAN 15. This signal includes a unit ID indicating that each electronic control unit (25, 35, 45) is connected to the CAN 15, and a unique output from each electronic control unit (25, 35, 45). Information flows according to a predetermined format. When the meter control unit 55 receives a signal representing the unit ID in this signal, the process proceeds to step S16.

  In step S16, a predetermined value indicating that the unit ID is detected in a signal output from each electronic control unit (25, 35, 45) and received by the meter control unit 55 is provided at a predetermined address in the RAM 75. The first flag is set by writing.

  In step S17, a second flag corresponding to the unit ID representing the electronic control unit detected in step S15 is set at a predetermined address in the EEPROM 85.

  Thereafter, the process proceeds to step S9, and the operation of the meter control unit 55 is confirmed. This operation check is performed by outputting a predetermined signal from each electronic control unit (25, 35, 45) connected to the CAN 15, indicated by the unit ID received in step S15, and controlling the meter. The unit 55 receives the signal and confirms that a predetermined display is made on the meter 90 based on the received signal.

  When it is determined in step S9 that the meter control unit 55 is operating normally, the process proceeds to step S11.

  In step S11, it is detected that a predetermined signal has been generated or that the pseudo signal generator 52 has been removed. However, since none of the results corresponds to the second step, the process proceeds to step S4.

  On the other hand, when the meter control unit 55 is not operating normally in step S9, the process proceeds to step S10, and the indicator indicating the abnormality is displayed on the indicator of the meter 90. The inspector investigates the cause of the abnormality and takes countermeasures based on the abnormality display.

  After shifting from step S11 to step S4, the operation check is repeated until the power supply from the power supply unit 100 stops.

  When the operation check is completed, the ignition switch of the vehicle is disconnected, and the power supply from the power supply unit 100 is stopped, it is determined in step S4 that power is not supplied. When the supply of power is stopped, the contents stored in the RAM 75 are cleared. Therefore, in step S5, the contents of the first flag are cleared, and the inspection in the second step is terminated in step S6.

  In step S17, the vehicle is shipped to the customer while the state of the second flag stored in the EEPROM 85 is maintained.

  Depending on the specifications of the vehicle to be manufactured, the type of electronic control unit to be mounted may be different. For example, in the case of a vehicle not equipped with a constant speed traveling device, the cruise control unit 35 is not connected in FIG. Even in such a case, the inspection in the second step is performed according to the flowchart of FIG.

  That is, when the unit ID corresponding to the cruise control unit 35 is not included in the signal representing the unit ID received in step S15, the cruise control unit 35 is included in the second flag set in step S17. The corresponding flag is not written.

  Then, the operation check in step S9 is performed assuming that the cruise control unit 35 is not connected.

  Thus, the inspection in the second step is performed according to the type of the electronic control unit that is actually connected to the CAN 15.

  Next, the inspection flow in the third step will be described. The inspection in the third step is performed each time the vehicle engine is started after the shipped vehicle has been delivered to the customer.

  The inspection in the third step starts from determining whether or not the pseudo signal generator 52 is connected in step S2. At this time, since the pseudo signal generator 52 is not connected, the process proceeds to step S4.

  Next, in step S <b> 4, it is determined whether power is supplied from the power supply unit 100 to the meter control unit 55. Then, when the power is supplied, the process proceeds to step S7.

  In step S7, it is determined whether or not the second flag is set. In the case of the first embodiment, the value corresponding to the unit ID representing the electronic control unit connected to the CAN 15 is stored in the second flag set in the EEPROM 85 in the second step inspection. In step S7, it is determined that the second flag is set, and the process proceeds to step S8.

  Next, in step S8, the unit ID received from the CAN 15 is compared with the state of the second flag set in the EEPROM 85.

  Here, when the unit ID received from the CAN 15 is different from the state of the second flag set in the EEPROM 85, the process proceeds to step S10, and the indicator indicating the abnormality is displayed on the indicator of the meter 90. At this time, the user of the vehicle brings the vehicle to the store, and the store investigates the cause of the abnormality and takes countermeasures based on the content of the abnormality display.

  On the other hand, when the received unit ID is equal to the state of the second flag set in the EEPROM 85 in step S8, the process proceeds to step S9 and the operation of the meter control unit 55 is confirmed. This operation check is performed based on, for example, outputting a signal of a predetermined format from each electronic control unit (25, 35, 45) connected to the CAN 15, and receiving the signal by the meter control unit 55. Then, it is performed by confirming that a predetermined display is made on the meter 90. The operation check in step S9 is performed in the background when the meter control unit 55 is actually operating, so that the vehicle user is not aware of the operation check.

  In step S9, when the meter control unit 55 is not operating normally, the process proceeds to step S10, and the indicator indicating the abnormality is displayed on the indicator of the meter 90. At this time, the user of the vehicle brings the vehicle to the store, and the store investigates the cause of the abnormality and takes countermeasures based on the content of the abnormality display.

  On the other hand, when the meter control unit 55 is operating normally in step S9, the process proceeds to step S11, where it is detected that a predetermined signal has been generated or that the pseudo signal generator 52 has been removed. However, since none of the cases corresponds to the inspection in the third step, the process proceeds to step S4. Thereafter, the inspection in the third step is repeated until the power supply from the power supply unit 100 stops.

  When the operation check is completed, the ignition switch of the vehicle is cut, and the power supply from the power supply unit 100 is stopped, it is determined in step S4 that no power is supplied. When the supply of power is stopped, the stored contents of the RAM 75 are cleared. Therefore, in step S5, the contents of the first flag are cleared, and in step S6, the third step inspection ends.

  As described above, according to the connection inspection method for the in-vehicle LAN system according to the first embodiment, when the first flag is set in the RAM 75 configuring the first storage unit 70, the meter control unit 55 is This is a case where an electronic control unit is connected to CAN 15 and a unit ID indicating the type of the electronic control unit is flowing to CAN 15 because information indicating the unit ID of the electronic control unit connected to CAN 15 is not received. However, since information is not written to the second flag at an unexpected timing, only the second flag set in the EEPROM 85 constituting the second storage unit 80 is kept cleared. This makes it possible to reliably shift from the first step inspection to the second step inspection. There is an advantage that it is possible to make a connection test of the electronic control unit in the AN system efficiently.

  Furthermore, according to the connection inspection method for the in-vehicle LAN system of the present invention, not only the inspection performed in the factory production line, but also after the vehicle is shipped, the inspection can be performed using the same software. There is an effect that inspections in various scenes can be performed efficiently without changing the software.

  In the present embodiment, the inspection of the meter control unit 55 has been described as an example. However, the inspection target is not limited to the meter control unit 55. In other words, it can be applied to inspection of other electronic control devices connected to an in-vehicle LAN such as a body control unit that performs door / power window open / close control and lighting on / off control. Yes.

  Furthermore, although the vehicle-mounted LAN described in the present embodiment is configured by the CAN 15, it may be configured by a LAN having a protocol other than CAN.

  Note that the present invention can be applied not only to gasoline vehicles but also to vehicles having an in-vehicle network environment, regardless of the type of power source of the vehicle, such as hybrid vehicles, electric vehicles, and fuel cell vehicles.

15 CAN
25 AT control unit 35 Cruise control unit 45 ABS control unit 52 Pseudo signal generator 55 Meter control unit 60 CPU
75 RAM
85 EEPROM
90 Meter 100 Power supply unit

Claims (2)

A network environment composed of an in-vehicle LAN disposed in a vehicle, or an inspection LAN imitating the in-vehicle LAN;
The first storage unit is connected to the network environment and retains the stored content while power is supplied, and the stored content is erased when power is not supplied, regardless of the power supply state. An electronic control device having a second storage unit in which stored contents are held, and exhibiting a predetermined function based on information flowing in the network environment;
At least one electronic control unit connected to the network environment and outputting information necessary to operate the electronic control device;
A power supply unit that supplies power to the network environment, the electronic control device, and the electronic control unit;
In a vehicle-mounted LAN system provided with a connection inspection method for inspecting a connection state between the electronic control device and the electronic control unit,
The electronic control device detecting the type of the electronic control unit connected to the network environment when the first flag of the first storage unit is not set;
When the electronic control device detects the type of the electronic control unit connected to the network environment, a predetermined first flag is set in the first storage unit, and in the second storage unit, Setting a second flag corresponding to the type of the electronic control unit connected to the network environment;
The electronic control device detects the network environment of the electronic control unit when the type of the electronic control unit connected to the network environment detected by the electronic control device is equal to the state of the second flag. Determining that the connection status to is normal;
A step of not detecting the type of the electronic control unit connected to the network environment when the first flag is set;
Erasing the second flag;
And a step of stopping the supply of power from the power supply unit and erasing the first flag.   Instead of the electronic control unit, a pseudo-output that outputs information indicating that the electronic control unit is connected to all the electronic control units that are likely to be connected to the electronic control device to the network environment. The in-vehicle LAN system connection inspection method according to claim 1, further comprising a step of connecting a signal generating means.