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Apparatus for discriminating anomaly of detecting device
| Details |
Inventors: Sugitani, Nobuyoshi;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Zanelli; Michael J.
Assistant Examiner:
Attorney, Agent or Firm: Oliff & Berridge, PLC
An anomaly discriminating apparatus of the present invention comprises: first and second detecting devices for detecting state values of one event; and a processing device storing occurrence probability distribution group data which is a set of occurrence probability distributions of state values probably detected by the second detecting device against an arbitrary state value detected by the first detecting device, the processing device reading an occurrence probability on an occurrence probability distribution determined by a first state value detected by the first detecting device and a second state value detected by the second detecting device, the processing device determining whether at least either one of the first and second detecting devices is anomalous, based on a plurality of occurrence probabilities read out at different timings. |
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DETAILED DESCRIPTION An anomaly discriminating apparatus of the present invention has been accomplished in view of the above problem, and the apparatus comprises first and second detecting means for detecting state values of one event; and processing means storing occurrence probability distribution group data which is a set of occurrence probability distributions of state values probably detected by the second detecting means against an arbitrary state value detected by the first detecting means, the processing means reading an occurrence probability on an occurrence probability distribution determined by a first state value detected by the first detecting means and a second state value detected by the second detecting means, the processing means determining whether at least either one of the first and second detecting means is anomalous, based on a plurality of occurrence probabilities read out at different timings.
The processing means is desirably arranged so that a probability threshold value T1 is set for each of the occurrence probability distribution data stored, the processing means calculates a product .
beta.
of values .
alpha.
(i=1, .
.
.
, n), each being a ratio of either of the n occurrence probabilities read at the different timings to a corresponding one of the probability threshold values T1 of the respective distributions, and the processing means determines that at least either one of the first and second detecting means is anomalous when the product .
beta.
is smaller than a predetermined value.
Further, the processing means is desirably arranged so that second occurrence probability distribution group data, which is a set of occurrence probability distributions of state values probably detected by the first detecting means against an arbitrary state value detected by the second detecting means, is further stored and so that a probability threshold value T2 is set for each occurrence probability distribution in the second occurrence probability distribution group data stored, the processing means reads an occurrence probability on an occurrence probability distribution in the second occurrence probability distribution group determined by a first state value detected by the first detecting means and a second state value detected by the second detecting means, the processing means calculates a product
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