Fault diagnosis apparatus for sensors used in a system
AssigneeHitachi, Ltd.
InventorToshio Hori
Life of this patent
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Abstract
A fault diagnosis apparatus for sensors in an apparatus system has at least three sensors which detect different physical quantities for one physical phenomenon which vary in correlation with one another, the sensors outputting signals indicating the detected physical quantities, wherein outputs from the at least three sensors are converted into one identical physical quantity in accordance with the correlations so that the resulting identical physical quantity can be used to determine whether or not each of the sensors is defective.
Claims8
A fault diagnosis apparatus for sensors in an apparatus system having at least three sensors which detect different physical quantities for a physical phenomenon which vary in correlation with one another, the sensors outputting signals indicating the detected physical quantities, the apparatus comprising:
- comparison means for comparing outputs from each set of two of the at least three sensors with each other;
- and
- determination means for determining whether or not a difference in output between the two sensors of each set has at least a predetermined value, the set being a result of mutual comparison by the comparison means, and comparing a set involving a difference of at least the predetermined value with a set not involving a difference of at least the predetermined value to determine that one of the sensors is defective.
A vehicle comprising the fault diagnosis apparatus for sensors in an apparatus system having at least three sensors which detect different physical quantities for a physical phenomenon which vary in correlation with one another, the sensors outputting signals indicating the detected physical quantities, the apparatus comprising:
- comparison means for comparing outputs from each set of two of the at least three sensors with each other;
- and
- determination means for determining whether or not a difference in output between the two sensors of each set has at least a predetermined value, the set being a result of mutual comparison by the comparison means, and comparing a set involving a difference of at least the predetermined value with a set not involving a difference of at least the predetermined value to determine that one of the sensors is defective.
A control apparatus for internal combustion engines, the apparatus comprising the fault diagnosis apparatus for sensors in an apparatus system having at least three sensors which detect different physical quantities for a physical phenomenon which vary in correlation with one another, the sensors outputting signals indicating the detected physical quantities, the apparatus comprising:
- comparison means for comparing outputs from each set of two of the at least three sensors with each other;
- and
- determination means for determining whether or not a difference in output between the two sensors of each set has at least a predetermined value, the set being a result of mutual comparison by the comparison means, and comparing a set involving a difference of at least the predetermined value with a set not involving a difference of at least the predetermined value to determine that one of the sensors is defective.
Dependencies are inferred from the claim text.