Fault tolerant system and method of majority voting.

摘要

The invention relates to an apparatus for rendering a plurality of sub-data processing systems to a fault tolerant system and a method for majority voting, wherein input signals supplied to the plurality of redundant subsystems are input to an output selecting circuit after an output of a subsystem is changed from an output signal of a subsystem having a most reliable output signal to another output signal of another subsystem having a lower reliable output signal in turn using self-diagnosis and cross-diagnosis in each subsystem according to majority voting rules. The output selecting circuit outputs a signal selected by the majority voting rules based on the output signals from the subsystems.