Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication
Patent
1997-11-25
2000-06-27
Louis-Jacques, Jacques H.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
701 35, 701115, G05D 100, G06F 1700
Patent
active
060817550
ABSTRACT:
A vehicle control device has an PROM with a first and second memory area. The contents of the PROM are updated by erasing locations for a vehicle control program, writing part of the vehicle control program into the PROM, checking for abnormalities in the writing process, and then writing the remaining part of the vehicle control program into the PROM only when the result of writing the part first is determined not to have been abnormal. This determination may be based on a checksum, of the program codes that were expected to have been written into the first memory area as the first part of the vehicle control program, compared with the checksum of the program codes actually written. In the event of an abnormality, only the part of the vehicle control program first written is in the PROM, and the area in which the remaining part of the vehicle control program would have been written remains erased. The remaining part of the vehicle control program is a part of the program necessary for proper functioning, such as the reset vector. If the reset vector of the vehicle control program is used as the remaining part, and the remaining part is not written due to the detection of an abnormality, then any attempt to execute the abnormally updated control program will result in performance that is manifestly abnormal and easy to detect in subsequent production steps.
REFERENCES:
patent: Re31582 (1984-05-01), Hosaka et al.
patent: 5406484 (1995-04-01), Wurzenberger
patent: 5638272 (1997-06-01), Minowa et al.
patent: 5717387 (1998-02-01), Suman et al.
patent: 5828977 (1998-10-01), Hayashi et al.
Louis-Jacques Jacques H.
Mitsubishi Denki & Kabushiki Kaisha
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