Data backup apparatus utilized in an electronic control system a

Details Data backup apparatus utilized in an electronic control system a Data backup apparatus utilized in an electronic control system a

1994-12-16

1997-09-16

Teska, Kevin J.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

371 671, 39518204, 701114, G06F 1116

Patent

active

056687265

ABSTRACT:
A backup RAM for storing pieces of diagnosis data regardless of the cut-off of an electric power is provided in a portion of a RAM. In cases where the detection of an unusual condition by a throttle sensor or a water temperature sensor is judged by a CPU in a current processing routine, a first checking value indicating that the backup RAM is in a renewing period is stored in a checking region of the backup RAM, and pieces of previous diagnosis data stored in a data access region of the backup RAM in a previous processing routine are copied to a temporary refuge region of the backup RAM. Thereafter, pieces of updated diagnosis data obtained in the current processing routine are stored one by one in the data access region in place of the previous diagnosis data, and a second checking value indicating that the backup RAM is in a renewal finishing period is stored in the checking region. In cases where the first checking data is stored in the checking region when the electric power cut off is again supplied, the previous diagnosis data stored in the temporary refuge region are returned to the data access region and are read out according to a request from a diagnosis checker.

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