ABNORMALITY DETECTING DEVICE FOR CONSTRUCTION MACHINE
First Claim
1. An abnormality detecting device for a construction machine equipped with a plurality of sensor means placed at a plurality of parts of the construction machine, the sensor means detecting a plurality of related physical states and outputting a plurality of pieces of sensor information, comprising:
- correlation coefficient calculation means which receives the plurality of pieces of sensor information outputted from the plurality of sensor means, generates time-series physical state information in a predetermined period on each of the plurality of pieces of sensor information corresponding to the plurality of sensor means, and calculates a plurality of correlation coefficients between separated pieces of time-series physical state information on each of the plurality of pieces of sensor information;
correlation coefficient comparison means which compares the correlation coefficients calculated by the correlation coefficient calculation means and calculates the degree of difference of each correlation coefficient from other correlation coefficients; and
abnormality judgment means which judges that when the degree of difference calculated by the correlation coefficient comparison means exceeds a preset value, an abnormality has occurred to a part related to the corresponding sensor means.
1 Assignment
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Accused Products
Abstract
Provided is an abnormality detecting device for a construction machine that can estimate an abnormality occurring to a component (engine, pump, etc.) of the construction machine based on the relationship among a plurality of pieces of sensor information and thereby prevent machine failure. A correlation coefficient calculation unit 102 calculates correlation coefficients between time-series sensor values acquired by a plurality of sensors 101. A correlation coefficient comparison unit 103 compares the correlation coefficients and calculates the degree of difference between each correlation coefficient and other correlation coefficients. An abnormality judgment unit 104 judges that an abnormality has occurred to a part related to a sensor when the degree of difference calculated in regard to the sensor exceeds a preset value.
22 Citations
13 Claims
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1. An abnormality detecting device for a construction machine equipped with a plurality of sensor means placed at a plurality of parts of the construction machine, the sensor means detecting a plurality of related physical states and outputting a plurality of pieces of sensor information, comprising:
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correlation coefficient calculation means which receives the plurality of pieces of sensor information outputted from the plurality of sensor means, generates time-series physical state information in a predetermined period on each of the plurality of pieces of sensor information corresponding to the plurality of sensor means, and calculates a plurality of correlation coefficients between separated pieces of time-series physical state information on each of the plurality of pieces of sensor information; correlation coefficient comparison means which compares the correlation coefficients calculated by the correlation coefficient calculation means and calculates the degree of difference of each correlation coefficient from other correlation coefficients; and abnormality judgment means which judges that when the degree of difference calculated by the correlation coefficient comparison means exceeds a preset value, an abnormality has occurred to a part related to the corresponding sensor means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification