Abnormality Judging Device
First Claim
Patent Images
1. An abnormality judging device comprising:
- detecting means which detects a physical quantity generated from a revolving tire;
variable sampling means which samples a signal corresponding to the physical quantity detected by the detecting means, at a cycle corresponding to the revolving speed of the tire;
FFT processing means which converts a signal along the time axis, sampled by the variable sampling means, into a signal along the frequency axis; and
judging means which judges that the tire is in an abnormal state in a case where the signal converted by the FFT processing means exceeds a predetermined threshold.
1 Assignment
0 Petitions
Accused Products
Abstract
A detecting unit 210 detects a physical quantity generated from a revolving tire for each tire. An adaptive digital filter 222 extracts a specific signal for each tire from signals corresponding to the physical quantity detected by the detecting unit 210. A judging unit 230 judges that the tire is abnormal when a difference value between two signals extracted by the digital filter 222 exceeds a predetermined threshold.
-
Citations
16 Claims
-
1. An abnormality judging device comprising:
detecting means which detects a physical quantity generated from a revolving tire;
variable sampling means which samples a signal corresponding to the physical quantity detected by the detecting means, at a cycle corresponding to the revolving speed of the tire;
FFT processing means which converts a signal along the time axis, sampled by the variable sampling means, into a signal along the frequency axis; and
judging means which judges that the tire is in an abnormal state in a case where the signal converted by the FFT processing means exceeds a predetermined threshold.- View Dependent Claims (2)
-
3. The abnormality judging device comprising:
-
detecting means which detects a physical quantity generated from the revolving tire;
variable sampling means which samples a signal corresponding to the physical quantity detected by the detecting means, at a cycle corresponding to a revolving speed of the tire;
specific order component extracting means which extracts signals of a plurality of specific order components from signals sampled by the variable sampling means; and
judging means which judges that the tire is in an abnormal state when the signals extracted by the specific order component extracting means exceed a predetermined threshold. - View Dependent Claims (4)
-
-
5. An abnormality judging device comprising:
detecting means which detects a physical quantity generated from a revolving tire;
variable sampling means which samples a signal corresponding to the physical quantity detected by the detecting means, at a cycle corresponding to the revolving speed of the tire;
adding means which adds up the signals per unit of revolutions sampled by the variable sampling means, sequentially for each unit of revolutions; and
judging means which judges that the tire is in an abnormal state when the signals added up by the adding means exceed a predetermined threshold.- View Dependent Claims (6)
-
7. An abnormality judging device comprising:
detecting means which detects a physical quantity generated from a revolving tire;
specific order component extracting means which extracts signals of a plurality of specific order components corresponding to a revolving speed of the tire, from signals corresponding to the physical quantity detected by the detecting means; and
judging means which judges that the tire is in an abnormal state when the signals extracted by the specific order component extracting means exceed a predetermined threshold.
-
8. An abnormality judging device comprising:
detecting means which detects a physical quantity generated from a revolving tire, for each of the tires;
extracting means for extracting a specific signal from signals corresponding to the physical quantity detected by the detecting means, for each of the tires; and
judging means for judging that the tire is abnormal when a difference value between two signals extracted by the extracting means exceeds a predetermined threshold.- View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
Specification