Electronic control system and method for vehicle diagnosis
First Claim
1. An electronic control unit for vehicle diagnosis comprising:
- a rewritable nonvolatile memory;
diagnosing means for diagnosing a vehicle device mounted in the vehicle based on a signal from the vehicle device and store in the rewritable nonvolatile memory a diagnosis result indicating abnormality of the vehicle device;
control data storing means for storing control data indicating whether storage of the diagnosis result in the rewritable nonvolatile memory is permitted;
permission switching means for changing the control data from non-permission to permission upon detecting that the vehicle has moved out of a specified region; and
storage permitting means for permitting the diagnosing means to store the diagnosis result in the rewritable nonvolatile memory only when the control data within the control data storing means is indicative of the permission.
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Accused Products
Abstract
A vehicle diagnosis system includes an electronic control unit, which executes a diagnosing process for determining whether any abnormality is present in a vehicle based on signals from vehicle devices. When any abnormality is detected, the electronic control unit stores in an EEPROM a diagnosis result indicative of the abnormality when a storage permission flag in the EEPROM is in the on-state. The storage permission flag is turned on from the off-state when receiving a storage permission command from an external unit. Thus, the storage of the diagnosis result into the EEPROM may be permitted at the time of transmitting the storage permission command externally to the ECU.
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Citations
14 Claims
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1. An electronic control unit for vehicle diagnosis comprising:
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a rewritable nonvolatile memory; diagnosing means for diagnosing a vehicle device mounted in the vehicle based on a signal from the vehicle device and store in the rewritable nonvolatile memory a diagnosis result indicating abnormality of the vehicle device; control data storing means for storing control data indicating whether storage of the diagnosis result in the rewritable nonvolatile memory is permitted; permission switching means for changing the control data from non-permission to permission upon detecting that the vehicle has moved out of a specified region; and storage permitting means for permitting the diagnosing means to store the diagnosis result in the rewritable nonvolatile memory only when the control data within the control data storing means is indicative of the permission. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electronic control unit for vehicle diagnosis comprising:
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a rewritable nonvolatile memory; and a processing unit configured to diagnose a vehicle device mounted in the vehicle based on a signal from the vehicle device and store in the rewritable nonvolatile memory a diagnosis result indicating abnormality of the vehicle device, wherein the processing unit is further configured to change a control data from non-permission to permission upon detecting that the vehicle has moved out of a specified region, the control data indicating whether storage of the diagnosis result in the rewritable nonvolatile memory is permitted, and wherein the processing unit is further configured to permit storing of the diagnosis result in the rewritable nonvolatile memory only when the control data is indicative of the permission. - View Dependent Claims (9, 10, 11)
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12. A method for controlling storage of data in a rewritable nonvolatile memory of an electronic control unit for a vehicle, the method comprising:
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diagnosing a vehicle device mounted in the vehicle based on a signal from the vehicle device; storing control data indicating whether a diagnosis result indicating abnormality of the vehicle device is permitted to be stored in the rewritable nonvolatile memory; changing the control data from non-permission to permission upon detecting that the vehicle leaves a specified region to be used by a user; and storing the diagnosis result in the rewritable nonvolatile memory, only when the control data is indicative of the permission. - View Dependent Claims (13, 14)
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Specification