Electronic control having floating-point data check function

Details Electronic control having floating-point data check function Electronic control having floating-point data check function

2005-06-07

2005-06-07

Bonzo, Bryce P. (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S051000, C701S036000, C701S114000, C701S101000, C708S495000

Reexamination Certificate

active

06904543

ABSTRACT:
An engine control ECU includes a microcomputer, which includes CPU, RAM, ROM, FPU and I/O. The FPU performs floating-point calculations and the CPU carries out operations other than the floating-point calculations. The CPU checks whether non-numeric exists, and performs backup processing when the non-numeric is found. In the backup processing, the RAM data is initialized by writing default values harmless to control as the RAM data. In addition to or alternative to the initialization, the CPU disables a floating-point calculation of the FPU. Without using the FPU, the CPU performs engine control operations by using integer data instead of floating-point data.

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