Fault tolerant system with equivalence processsing driving fault detection and backup activation

摘要

A system includes a primary functionality and a backup functionality for the primary functionality. A measurement circuit measures operational parameter values of the primary functionality. A fault detection circuit determines a level of equivalence between the operation of the primary functionality and a reference functionality on a weighted comparison of the measured operational parameter values of the primary functionality to corresponding reference operational parameter values for the reference functionality If the equivalence determination fails to find equivalence, the fault detection circuit signals fault in the primary functionality and activates the backup functionality.