G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 3/08 (2006.01)
Patent
CA 2165489
The method according to the invention for mini- mizing measured quantities which are determined from sensors affected by measuring failures and are detected by a plurality of redundant sensors connected to form a measuring system, by detecting and isolating the sensors affected by failures, provides that the sensor values measured by all the sensors are mapped by a linear transformation into a vector in the parity space (parity vector), the dimension of the parity space being deter- mined by the redundance of the measuring system, which is to say by the number of sensors and the dimension of the quantity to be measured. The principle of the method consists in that, by projection of the measured parity vector onto all possible subspaces, it is determined which of the subspaces at each failure level contains the largest proportion of the measured parity vector. By omitting the sensor combinations belonging to these subspaces, the best sensor combination at each failure level can be determined. The invention fundamentally differs from known parity methods or maximum likelihood methods in that the geometrical interpretation of the properties of the parity space and their consequent use for isolating simultaneously occurring multiple failures are used, the directions in the parity space being determined in an off-line analysis, and the isolation results being provided in a precalculated table. In particular, the method allows an optimally possible adaptive matching of the detection thresholds to the general noise level of the sensors assumed to be failure-free.
Kirby Eades Gale Baker
Litef Gmbh
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