On-vehicle fault detecting device
First Claim
1. An on-vehicle fault detecting device for detecting whether or not there has occurred a fault in the device itself or in its hardware component, the device comprising:
- data writing means for writing data in a memory;
data reading means for reading data written in the memory;
coincidence-of-data determining means for determining whether or not the data read by the data reading means from the memory is coincident with data intended to be written by the data writing means in the memory, wherein the device is operative to determine that there has occurred a hardware fault only in cases where the coincidence-of-data determining means determines that the read data is not coincident with the intended data to be written;
usage-environment-information acquiring means for acquiring information about a usage environment around a vehicle equipped with the device; and
usage-environment-change determining means for determining whether or not the usage environment around the vehicle has changed on the basis of the usage environment information acquired by the usage-environment-information acquiring means, while it is continuously determined by the coincidence-of-data determining means that the read data is not coincident with the intended data to be written,wherein even in cases where the coincidence-of-data determining means has determined that the read data is not coincident with the intended data to be written, the device is operative not to determine that there has occurred a hardware fault unless the usage-environment-change determining means determines that the usage environment has changed.
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Accused Products
Abstract
There is disclosed an on-vehicle fault detecting device that can more accurately identify what has caused data different from intended-to-be-written data in a memory as a hardware fault. The IG-operation counting unit counts a number of ON-operations of the ignition (IG) switch. The usage-environment-change determining unit determines whether or not a number of times of continuous non-coincidence has reached a determination number, and presumes that the usage environment has changed if a number of continuous IG-switch operations has reached a determination number. Even in cases where the number of times of continuous non-coincidence has reached the determination number, the data writing unit will not write occurrence of a fault in hardware in the memory unless it is presumed by the usage-environment-change determining unit that the usage environment around the vehicle C has changed.
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Citations
26 Claims
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1. An on-vehicle fault detecting device for detecting whether or not there has occurred a fault in the device itself or in its hardware component, the device comprising:
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data writing means for writing data in a memory; data reading means for reading data written in the memory; coincidence-of-data determining means for determining whether or not the data read by the data reading means from the memory is coincident with data intended to be written by the data writing means in the memory, wherein the device is operative to determine that there has occurred a hardware fault only in cases where the coincidence-of-data determining means determines that the read data is not coincident with the intended data to be written; usage-environment-information acquiring means for acquiring information about a usage environment around a vehicle equipped with the device; and usage-environment-change determining means for determining whether or not the usage environment around the vehicle has changed on the basis of the usage environment information acquired by the usage-environment-information acquiring means, while it is continuously determined by the coincidence-of-data determining means that the read data is not coincident with the intended data to be written, wherein even in cases where the coincidence-of-data determining means has determined that the read data is not coincident with the intended data to be written, the device is operative not to determine that there has occurred a hardware fault unless the usage-environment-change determining means determines that the usage environment has changed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 24, 25)
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16. An on-vehicle fault detecting device for detecting whether or not there has occurred a fault in the device or in its hardware itself, the device comprising:
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data reading means for reading data written in a memory; coincidence-of-data determining means for determining whether or not data read by the data reading means from the memory is coincident with predetermined data, wherein the device is operative to determine that there has occurred a hardware fault only in cases where the coincidence-of-data determining means determines that the read data is not coincident with the predetermined data; usage-environment-information acquiring means for acquiring information about a usage environment around a vehicle equipped with the device; and usage-environment-change determining means for determining whether or not the usage environment around the vehicle has changed on the basis of the usage environment information acquired by the usage-environment-information acquiring means, while it is continuously determined by the coincidence-of-data determining means that the read data is not coincident with the predetermined data, wherein even in cases where the coincidence-of-data determining means has determined that the read data is not coincident with the predetermined data, the device is operative not to determine that there has occurred a hardware fault unless the usage-environment-change determining means determines that the usage environment has changed. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 26)
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Specification