Electronic control unit and information management system
A VIN storage electronic control unit stores a vehicle identification number (VIN). A standby RAM that holds data constantly with an electric power supplied by a battery stores failure diagnosis related information and a rewriting history flag. When the VIN storage electronic control unit rewrites the VIN upon receiving a request signal for rewriting the VIN, the standby RAM updates the rewriting history flag so as to switch into a set status indicating the rewriting is made. When receiving a request signal for eliminating the failure diagnosis related information, the failure diagnosis related information stored in the standby RAM is reset and the rewriting history flag is switched into a reset status. In addition, while the rewriting history flag is in the set status, a malfunction indicator lamp is turned on.
1. An electronic control unit for a vehicle, the electronic control unit containing a storage media that stores a vehicle identification code and failure diagnosis related information as well, the failure diagnosis related information indicating (i) an execution or a non-execution of a failure diagnosis, and (ii) an execution result of the failure diagnosis,
the electronic control unit comprising:
a rewriting section configured to rewrite the vehicle identification code when a rewriting instruction for the vehicle identification code is inputted;
a history writing section configured to write, in the storage media, history information when the rewriting section rewrites the vehicle identification code, the history information indicating an execution of the rewriting of the vehicle identification code; and
an elimination section configured to eliminate the history information written by the history writing section when a prescribed condition is satisfied,
wherein the elimination section eliminates the failure diagnosis related information together with the history information.
2. The electronic control unit according to claim 1 , wherein
the elimination section eliminates the failure diagnosis related information together with the history information when an elimination instruction is inputted from a device outside of the vehicle.
3. An electronic control unit for a vehicle, the electronic control unit containing as storage media (i) a nonvolatile memory in which data rewriting is electrically enabled, and (ii) a volatile memory serving as a backup memory in which data storage is enabled with an electric power always supplied from a battery, the nonvolatile memory storing a vehicle identification code, the backup memory storing failure diagnosis related information that indicates an execution or a non-execution of a failure diagnosis and an execution result of the failure diagnosis,
the electronic control unit comprising:
a rewriting section configured to rewrite the vehicle identification code when a rewriting instruction for the vehicle identification code is inputted; and
a history writing section configured to write, in the backup memory, history information when the rewriting section rewrites, the history information indicating an execution of the rewriting of the vehicle identification code.
4. An electronic control unit for a vehicle, the electronic control unit containing a storage media that stores a vehicle identification code and failure diagnosis related information as well, the failure diagnosis related information indicating (i) an execution or a non-execution of a predetermined failure diagnosis, and (ii) an execution result of the predetermined failure diagnosis,
the electronic control unit comprising:
a rewriting section configured to rewrite the vehicle identification code when a rewriting instruction for the vehicle identification code is inputted;
a history writing section configured to write, in the storage media, history information when the rewriting section rewrites the vehicle identification code, the history information indicating an execution of the rewriting of the vehicle identification code;
a determination section configured to determine whether the predetermined failure diagnosis corresponding to the failure diagnosis related information stored in the storage media is thoroughly executed after the rewriting section rewrites the vehicle identification code; and
an elimination section configured to eliminate the history information written by the history writing section when the determination section determines that the predetermined failure diagnosis is thoroughly executed.
5. The electronic control unit according to claim 4 , wherein
the determination section determines that the predetermined failure diagnosis is not thoroughly executed until a travel amount, which the vehicle travels after the rewriting section rewrites the vehicle identification code, exceeds a predetermined amount; and
the determination section determines that the predetermined failure diagnosis is thoroughly executed when the travel amount exceeds the predetermined amount.
6. The electronic control unit according to claim 1 , further comprising:
a rewriting notification section configured to cause an alarm lamp mounted in the vehicle to turn on for a duration from when the rewriting section rewrites the vehicle identification code to when the history information is eliminated from the storage media.
7. The electronic control unit according to claim 6 , communicating via an in-vehicle network within the vehicle with an alarm device that is connected with the alarm lamp, the alarm device causing the alarm lamp to turn on when there is arising an electronic control unit with which communications via the in-vehicle network are interrupted,
wherein the rewriting notification section interrupts communications with the alarm device for a duration from when the rewriting section rewrites the vehicle identification code to when the history information is eliminated from the storage media, thereby turning on the alarm lamp through the alarm device.
8. The electronic control unit according to claim 1 , further comprising:
a restriction section configured to restrict a travel of the vehicle for a duration from when the rewriting section rewrites the vehicle identification code to when the history information is eliminated from the storage media.
9. An information management system for a vehicle, the system comprising:
at least two electronic control units including a first electronic control unit and at least one second electronic control unit, the at least two electronic control units being communicated via an in-vehicle network within the vehicle,
the first electronic control unit storing a vehicle identification code, at least the first electronic control unit out of the at least two electronic control units storing failure diagnosis related information indicating an execution or a non-execution of a failure diagnosis and an execution result of the failure diagnosis,
the first electronic control unit comprising:
a rewriting section configured to rewrite the vehicle identification code when a rewriting instruction for the vehicle identification code is inputted;
a history writing section configured to write, in a storage media of one of the at least one second control unit, history information when the rewriting section rewrites, the history information indicating an execution of the rewriting of the vehicle identification code; and
an elimination section configured to eliminate the failure diagnosis related information from a storage media contained in the first electronic control unit when an elimination instruction is inputted from a device outside of the vehicle via the in-vehicle network,
wherein the one of the at least one second control unit that stores the history information eliminates the history information from the storage media contained in the one of the at least one second electronic control unit when the elimination instruction is inputted via the in-vehicle network.
10. The information management system according to claim 9 , wherein:
the history writing section further writes the history information in a storage media contained in the first electronic control unit; and
the elimination section eliminates the history information together with the failure diagnosis related information.
11. The information management system according to claim 9 , wherein
the one of the at least one second electronic control unit, which stores the history information, is connected with an alarm lamp, and causes the alarm lamp to turn on from when the history information is stored in the storage media contained in the one of the at least one second electronic control unit to when the history information is eliminated from the storage media contained in the one of the at least one second electronic control unit.