JP2011231698A - Onboard electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an onboard electronic control device which does not require to have a separate nonvolatile storage means for storing vehicle identifying information unique to a vehicle mounted with the electronic control device and performs determination for initializing failure information by receiving vehicle identifying information without using dedicated information for initializing the failure information.SOLUTION: The onboard electronic control device includes a first onboard electronic control device and a second onboard control device. The second onboard control device temporarily stores, when vehicle identifying information unique to a vehicle mounted with the electronic received via a communication line is for the first time after power is ON, the received vehicle identifying information unique to the vehicle mounted with the electronic control device into a volatile storage means, and compares, when the vehicle identifying information unique to the vehicle mounted with the electronic control device received via the communication line is after the first time, the received current vehicle identifying information unique to the vehicle mounted with the electronic control device with the last received vehicle identifying information unique to the vehicle mounted with the electronic control device temporarily stored in the volatile storage means.

Description

  The present invention relates to an in-vehicle electronic control device, and more particularly, to initialization of failure information stored in a plurality of in-vehicle electronic control devices mounted on a vehicle as vehicle identification information unique to the mounted vehicle received via a communication line. The present invention relates to an in-vehicle electronic control device that is based on the above.

The in-vehicle electronic control device performs data communication with the vehicle external connection device (fault diagnosis tester) through the communication line, and may output or write various information such as failure information and control information in the in-vehicle electronic control device. Is possible. In recent years, a plurality of in-vehicle electronic control devices are connected via a communication line, and there is a system that performs control in cooperation while transmitting / receiving control information between the in-vehicle electronic control devices. In some cases, vehicle identification information (VIN: Vehicle Identification Number) specific to the mounted vehicle is included.
The conventional vehicle-mounted electronic control device includes a storage unit for storing vehicle identification information unique to the mounted vehicle, and determines by itself that the vehicle identification information unique to the mounted vehicle is not stored in the storage unit. In such a case, it requests the other vehicle-mounted electronic control device to transmit the vehicle identification information unique to the mounted vehicle, and as a result of the transmission request, the vehicle identification unique to the mounted vehicle transmitted from the other vehicle-mounted electronic control device. Some store information in a storage means. (Patent No. 3758356)

On the other hand, in OBDII (On Board Diagnostics II) established by CARB (California Atmospheric Resources Bureau), unique vehicle identification information of the mounted vehicle is provided for one of a plurality of in-vehicle electronic control devices related to exhaust gas. Is required to be able to be read by a vehicle external connection device (fault diagnosis tester), and when the vehicle identification information unique to the vehicle is re-registered, On the other hand, it is required to initialize failure information.
As methods for satisfying this requirement, there are those disclosed in Japanese Patent Application Laid-Open Nos. 2009-274514 and 2009-262679, but dedicated information is used to initialize failure information of all the plurality of in-vehicle electronic control units. We are using.

Japanese Patent No. 3758356 JP2009-274514 JP 2009-262679 A

However, when the dedicated information is used to initialize the failure information of all of the plurality of in-vehicle electronic control devices, the amount of information on the communication line and the communication load are increased. For this reason, when the vehicle identification information specific to the mounted vehicle is included as information for cooperative control, the information amount and communication on the communication line can be reduced by not using dedicated information to initialize the failure information. It is possible to reduce the load.
Further, when storing the vehicle identification information unique to the mounted vehicle, if the vehicle identification information unique to the mounted vehicle is stored using the volatile storage means, it is not necessary to specially provide the nonvolatile storage means.

  The present invention does not require special provision of nonvolatile storage means for storing vehicle identification information unique to the mounted vehicle, and does not use dedicated information for initializing the failure information. An object is to realize an in-vehicle electronic control device capable of receiving information and making a determination for initializing failure information.

  The present invention is capable of mutual data communication with other in-vehicle electronic control devices or vehicle externally connected devices via a communication line, and a plurality of in-vehicle devices capable of individually storing and initializing vehicle failure information. The first on-vehicle electronic control device has a non-volatile storage means for storing vehicle identification information unique to the mounted vehicle, and is unique to the mounted vehicle when the power is turned on. While the identification information is transmitted to the communication line, the second in-vehicle electronic control device has volatile storage means for temporarily storing the vehicle identification information unique to the mounted vehicle, and when the power is turned on, In the in-vehicle electronic control device configured to receive the vehicle identification information specific to the mounted vehicle via the communication line, after the second on-vehicle electronic control device is turned on, When the vehicle identification information unique to the mounted vehicle received via the communication line is the first time, the vehicle identification information unique to the received mounted vehicle is temporarily stored in the volatile storage means and received via the communication line. If the vehicle identification information specific to the mounted vehicle is after the first time, the received vehicle identification information specific to the current mounted vehicle and the vehicle specific to the mounted vehicle received last time and temporarily stored in the volatile storage means The identification information is compared.

According to the on-vehicle electronic control device of the present invention, even if the second on-vehicle electronic control device does not include the nonvolatile storage means for storing the vehicle identification information unique to the mounted vehicle, the first on-vehicle electronic control device transmits Judgment can be made by receiving vehicle identification information unique to the mounted vehicle. For this reason, the 2nd vehicle-mounted electronic control apparatus does not need to be provided with the non-volatile memory | storage means which memorize | stores vehicle identification information intrinsic | native to a mounting vehicle specially.
In addition, according to the on-vehicle electronic control device of the present invention, the vehicle identification information unique to the mounted vehicle is temporarily stored only during the first time when the power is turned on (at the time of starting the vehicle), while the vehicle is in operation thereafter. Can be determined at any timing as long as vehicle identification information unique to the mounted vehicle is received after the first time.

It is a flowchart of the failure information initialization process of a 2nd vehicle-mounted electronic control apparatus. (Example) It is a flowchart of the failure information initialization process of a 1st vehicle-mounted electronic control apparatus. (Example) It is a system block diagram of the vehicle-mounted electronic control apparatus mounted in the vehicle. (Example) It is a figure which shows the communication hardware structure of a vehicle-mounted electronic control apparatus. (Example)

The present invention determines initialization of failure information stored in a plurality of in-vehicle electronic control devices based on vehicle identification information specific to the mounted vehicle received via the communication line, and thus is unique to the mounted vehicle. This eliminates the need for special provision of nonvolatile storage means for storing the vehicle identification information.
Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention. In FIG. 3, reference numeral 1 denotes a vehicle, 2 denotes an engine as a driving power source, and 3 denotes an on-vehicle electronic control device mounted on the vehicle 1. The vehicle 1 includes, for example, a first in-vehicle electronic control device 3A, a second in-vehicle electronic control device 3B, etc. as a plurality of in-vehicle electronic control devices 3 for controlling various devices (actuators and the like) to be controlled. It has. The plurality of first in-vehicle electronic control devices 3A, second in-vehicle electronic control devices 3B,... Are communication lines that can communicate serially and can perform bidirectional data communication (CAN: CONTROLLER AREA NETWORK, etc.) 4 are connected to each other, and control objects are controlled while transmitting and receiving data to and from each other at normal times. A vehicle-side connector 5 is provided in the vehicle-side communication line 4.
The plurality of in-vehicle electronic control devices 3 include a failure diagnosis tester 6 as a vehicle external connection device that can be externally connected to the vehicle side communication line 4. The failure diagnosis tester 6 includes a display 7 and an out-of-vehicle communication line 9 that is a communication line provided with an out-of-vehicle connector 8 that can be connected to and disconnected from the vehicle-side connector 5. The failure diagnosis tester 6 is connected to at least one of the plurality of first in-vehicle electronic control devices 3A, second in-vehicle electronic control devices 3B... It is connected to the electronic control unit 3A, and executes a program rewriting process or failure diagnosis (OBDII: On Board Diagnosis II) of the connected first on-vehicle electronic control unit 3A.

The plurality of first on-vehicle electronic control devices 3A, second on-vehicle electronic control devices 3B,... Are configured as shown in FIG. Since the plurality of first on-vehicle electronic control devices 3A, second on-vehicle electronic control devices 3B,... Have substantially the same structure, only the first on-vehicle electronic control device 3A will be described here.
The first on-vehicle electronic control unit 3A includes various devices to be controlled, such as a body control module (BCM), an engine control module (ECM), a transmission (A / T) controller, an ABS (anti-lock brake system) controller, an air It is selected from a plurality of in-vehicle electronic control devices (electric control units (ECUs)) such as a back controller, and has a failure diagnosis function (self-diagnosis) of the vehicle 1 and also stores individual failure information in the vehicle 1 and Initialization is possible.
The first on-vehicle electronic control device 3A inputs a signal from a communication port 10 which is a communication means connected to the vehicle-side communication line 4 and a sensor 11 mounted on the vehicle 1 through a sensor signal line 12, and performs waveform processing. Together with the input processing device 13 that outputs to the communication port 10, and communicates with the communication port 10 and calculates the optimum control amount for the target control object based on the signal from the input processing device 12, and based on the calculation result A central processing unit (CPU) 14 for outputting control signals, control target data storage means (ROM) 15 comprising a block rewritable nonvolatile memory for storing control target control programs and data, and a central processing unit 14 central processing data storage means 16 comprising an EEPROM for storing control programs and data, and the central processing unit 4 is an arithmetic processing data storage means (RAM) 17 comprising a volatile memory for storing data for performing calculations and storing not only its own fault information (DTC) but also fault information of other in-vehicle electronic control units. In response to the control signal from the central processing unit 14, an output control device that outputs to the communication port 10 so as to drive the control target actuator 19 (fuel injection valve or the like) 19 mounted on the vehicle 1 by the control signal line 18. 20 and a power supply circuit 21.
Connected to the power supply circuit 21 is a power supply 23 for supplying power through a power line 22, and an ignition switch 25 for inputting an ignition switch signal through an ignition signal line 24. The power source 23 connects the vehicle side power line 26 and the vehicle side ground line 27 to the vehicle side connector 6.
In the failure diagnosis tester 6, an external power line 28 and an external ground line 29 are connected to the external connector 8. When the vehicle exterior connector 8 is connected to the vehicle-side connector 5, the failure diagnosis tester 6 is activated by being supplied with power from the power source 23, and is provided inside the first vehicle-mounted electronic control device 3 </ b> A, the second vehicle-mounted electronic control device 3 </ b> B. The failure information, the running state, etc. stored in the arithmetic processing data storage means 17 are read out and displayed on the display 7, and the program of the plurality of first in-vehicle electronic control devices 3A, second in-vehicle electronic control devices 3B,. Processing, execution of fault diagnosis, or rewriting of vehicle identification information (VIN: Vehicle Identification Number) unique to the mounted vehicle.

On the other hand, the second in-vehicle electronic control device 3B is configured in substantially the same manner as the first in-vehicle electronic control device 3A. However, the first in-vehicle electronic control unit 3A is a non-volatile area that is an area for storing vehicle identification information unique to the mounted vehicle in the control target data storage means (ROM) 15 formed of a non-volatile memory. A storage unit 30 is provided. The second in-vehicle electronic control unit 3B is an area for temporarily storing vehicle identification information unique to the mounted vehicle in an arithmetic processing data storage means (RAM) 17 comprising a volatile memory. Some volatile storage means 31 is provided.
As a result, the on-vehicle electronic control device 3 can perform data communication with another on-vehicle electronic control device or the failure diagnosis tester 6 via the communication line 4 and also stores failure information in the vehicle 1 individually. And a plurality of first vehicle-mounted electronic control devices 3A, second vehicle-mounted electronic control devices 3B,... That can be initialized. The first in-vehicle electronic control unit 3A includes a nonvolatile storage unit 30 for storing vehicle identification information (VIN: Vehicle Identification Number) unique to the vehicle on which the vehicle is mounted, and power is turned on by the ignition switch 25 (vehicle 1 The vehicle identification information unique to the mounted vehicle is transmitted to the vehicle-side communication line 4 at the time of activation of the vehicle. On the other hand, the second in-vehicle electronic control unit 3B has volatile storage means 31 for temporarily storing vehicle identification information unique to the mounted vehicle, and when the power is turned on by the ignition switch 25, Vehicle identification information specific to the mounted vehicle is received via the vehicle-side communication line 4.

In such an in-vehicle electronic control device 3, the second on-vehicle electronic control device 3 </ b> B has vehicle identification information unique to the mounted vehicle received via the vehicle-side communication line 4 after the power is turned on by the ignition switch 25. Is the first time, the vehicle identification information specific to the received mounted vehicle is temporarily stored in the volatile storage means 17, and the vehicle identification information specific to the mounted vehicle received via the vehicle side communication line 4 is the first time or later. In this case, the received vehicle identification information specific to the current mounted vehicle is compared with the vehicle identification information specific to the mounted vehicle received last time and temporarily stored in the volatile storage means 17.
The second in-vehicle electronic control device 3B initializes the failure information stored by itself when the vehicle identification information unique to the mounted vehicle in the current time and the previous time is different from each other. When the vehicle identification information unique to the previous vehicle is identical to each other, the failure information stored by itself is not initialized.

Next, the operation of this embodiment will be described.
The first on-vehicle electronic control device 3A performs the processing shown in FIG. 2 when the power is turned on. The second on-vehicle electronic control device 3B performs the process shown in FIG. 1 when the power is turned on.

As shown in FIG. 2, when the program starts when the power is turned on by the ignition switch 25 (A01), the first on-vehicle electronic control device 3A determines whether the ignition switch 25 is turned off (A02).
If this determination (A02) is YES, the program is ended (A07). When this determination (A02) is NO, vehicle identification information (VIN) specific to the mounted vehicle is transmitted to the vehicle side communication line 4 (A03), and the vehicle identification information specific to the mounted vehicle from the failure diagnosis tester 6 is transmitted. It is determined whether a write request has been received (A04).
If this determination (A04) is NO, the process returns to determination (A02). When this determination (A04) is YES, vehicle identification information specific to the mounted vehicle is written and stored in the nonvolatile storage means 30 (A05), failure information is initialized (A06), and determination (A02) Return to.

As shown in FIG. 1, when the program is started when the power is turned on by the ignition switch 25 (B01), the second on-vehicle electronic control device 3B determines whether the ignition switch 25 is turned off (BA02).
If this determination (B02) is YES, the program is ended (B10). If this determination (B02) is NO, it is determined whether vehicle identification information (VIN) unique to the mounted vehicle is received from the vehicle-side communication line 4 (B03).
If this determination (B03) is NO, the process returns to determination (B02). If this determination (B03) is YES, it is determined whether or not the vehicle identification information specific to the first (first) mounted vehicle after power-on is received (B04).
When this determination (B04) is YES, the vehicle identification information specific to the mounted vehicle received for the first time is written in the volatile storage means 31 as the vehicle identification information specific to the current mounted vehicle and temporarily stored (B05). ). If this determination (B04) is NO, the vehicle identification information specific to the current mounted vehicle received after the first time is replaced with the vehicle identification information specific to the previous mounted vehicle and written to the volatile storage means 17. Temporarily store (B06).
Thereafter, the received vehicle identification information specific to the mounted vehicle is written and temporarily stored in the volatile storage means 31 as vehicle identification information specific to the current mounted vehicle (B07), and the vehicle identification information specific to the current mounted vehicle is stored. And the vehicle identification information unique to the previous mounted vehicle are compared to determine whether they match (B08).
If this determination (B08) is NO, the process returns to determination (B02). When this determination (B08) is YES, failure information is initialized (B09), and the process returns to determination (B02).

Thus, according to this vehicle-mounted electronic control device 3, even if the second vehicle-mounted electronic control device 3B does not include the nonvolatile storage means 30 for storing the vehicle identification information unique to the mounted vehicle, the first vehicle-mounted electronic control device 3B. The determination can be made by receiving the vehicle identification information unique to the mounted vehicle transmitted by the electronic control unit 3A. For this reason, the 2nd vehicle-mounted electronic control apparatus 3B does not need to be provided with the non-volatile memory | storage means 30 which memorize | stores the vehicle identification information intrinsic | native to a mounted vehicle specially.
In addition, according to the on-vehicle electronic control device 3, the second on-vehicle electronic control device 3B is temporarily vehicle identification information unique to the mounted vehicle, only for the first time when the power is turned on (when the vehicle 1 is started). On the other hand, during subsequent driving, if the vehicle identification information unique to the mounted vehicle is received after the first time, the determination can be made at an arbitrary timing.

Furthermore, according to this vehicle-mounted electronic control device 3, the second vehicle-mounted electronic control device 3B has a failure that it memorizes when the vehicle identification information unique to the mounted vehicle in this time and the previous time is different from each other. On the other hand, when the vehicle identification information unique to the mounted vehicle in the current time and the previous time coincide with each other, the failure information stored by itself is not initialized.
For this reason, according to this on-vehicle electronic control device 3, when rewriting from the failure diagnosis tester 6 to another unique vehicle identification information, the failure information is initialized at a timing when the unique vehicle identification information is different. It can be carried out. Moreover, according to this vehicle-mounted electronic control apparatus 3, failure information can be initialized regardless of the driving history after the power is turned on (after the vehicle is started), and can be executed regardless of the frequency. Become.

  This invention can initialize failure information stored in a plurality of in-vehicle electronic control devices mounted on a vehicle based on vehicle identification information specific to the mounted vehicle received via a communication line. Yes, it can be applied to other communication control.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 In-vehicle electronic control unit 3A First in-vehicle electronic control unit 3B Second in-vehicle electronic control unit 4 Vehicle side communication line 6 Fault diagnosis tester 9 Outside communication line 10 Communication port 13 Input processing unit 14 Central processing unit 15 Data storage means for control object 16 Data storage means for central processing 17 Data storage means for arithmetic processing 20 Output control device 21 Power supply circuit 30 Non-volatile storage means 31 Volatile storage means

Claims (2)

A plurality of in-vehicle electronic control devices capable of mutual data communication with other in-vehicle electronic control devices or vehicle externally connected devices via a communication line and capable of individually storing and initializing vehicle failure information There,
The first in-vehicle electronic control unit has a nonvolatile storage means for storing vehicle identification information unique to the mounted vehicle and transmits vehicle identification information unique to the mounted vehicle to the communication line when the power is turned on. While
The second in-vehicle electronic control unit has volatile storage means for temporarily storing vehicle identification information unique to the mounted vehicle and communicates vehicle identification information specific to the mounted vehicle when the power is turned on. In-vehicle electronic control devices each configured to receive via a line,
When the vehicle identification information unique to the mounted vehicle received via the communication line is the first time after the second vehicle-mounted electronic control device is turned on, the vehicle identification information unique to the received mounted vehicle Is temporarily stored in the volatile storage means,
If the vehicle identification information specific to the mounted vehicle received via the communication line is after the first time, the received vehicle identification information specific to the current mounted vehicle and the previous received vehicle identification information are temporarily stored in the volatile storage means. The vehicle-mounted electronic control apparatus characterized by comparing with the vehicle identification information peculiar to the mounted vehicle. The second on-vehicle electronic control device initializes the failure information stored by itself when the vehicle identification information unique to the mounted vehicle in this time and the previous time is different from each other,
2. The vehicle-mounted electronic control according to claim 1, wherein when the vehicle identification information unique to the vehicle mounted in the current time and that in the previous time match each other, the failure information stored in the vehicle is not initialized. apparatus.

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