Vehicle diagnostic data storing system
AssigneeNissan Motor Co., Ltd.
InventorsShigeru Ishii, Yoshihide Shinso, Mitsuru Fujioka
Life of this patent
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Abstract
A vehicle diagnostic information storage system includes a volatile storage device such as a backup RAM and a nonvolatile storage device such as EEPROM. If a fault occurs, a control section stores data on fault items, and input and output conditions of sensors of a vehicle control system, in the volatile storage device and updates the data in the volatile storage device during a vehicle operation. In response to a switching operation of a vehicle main switch such as a turn-on operation of an ignition switch, the control section transfers the most recent version of updated data from the volatile storage device to the nonvolatile storage device.
Claims15
A fault information storage system for storing fault information on a vehicle control system, comprising:
- a first storing unit of a battery backup type for storing fault information if a fault occurs, and updating the fault information during a vehicle operation;
- a second storing unit of a nonvolatile type for storing a most recent version of the fault information in the first storing unit;
- a control unit for detecting a fault in the vehicle control system, for updating the fault information each time a fault is detected during the vehicle operation from a turn-on of an ignition key switch of the vehicle to a turn-off of the ignition key switch, and for performing a writing operation of writing the most recent version into the second storing unit if the fault information is updated during the vehicle operation, the control unit including a writing unit for performing the writing operation to write the information updated in a previous vehicle operation when the ignition switch is turned on,
- wherein the writing unit performs the writing operation again if the ignition switch is turned off during the writing operation.
A diagnostic control system, comprising:
- a memory section for storing diagnostic information, said memory section comprising a volatile storage device and a nonvolatile storage device;
- and
- a control section for storing the diagnostic information in the volatile storage device, updating the diagnostic information in the volatile storage device with a mere recent version during a vehicle operation and transferring a most recent version of the diagnostic information from the volatile storage device into the nonvolatile storage device,
- wherein the volatile storage device is connected with a backup battery, and the control section is connected with a vehicle main switch and configured to transfer the most recent version of the diagnostic information from the volatile storage device to the nonvolatile storage device in response to a switching operation of the vehicle main switch.
A diagnostic control process for a vehicle, comprising:
- an updating step of storing diagnostic information in a volatile storage device and updating the diagnostic information during a vehicle operation;
- and
- a writing step of transferring the diagnostic information from the volatile storage device to a nonvolatile storage device,
- wherein the updating step comprises a fault detecting sub-step for detecting a fault in a vehicle control system, and an updating sub-step for updating the diagnostic information in the volatile storage device if a fault is detected;
- and the writing step comprises an update checking sub-step for producing a first condition signal if the diagnostic information in the volatile storage device is updated, and a writing sub-step for transferring an updated version of the diagnostic information if the first condition signal is present.
Dependencies are inferred from the claim text.