Tire distortion detecting method, distortion detector, sensor unit thereof, and tire having the same
First Claim
1. A tire distortion detecting method using a plurality of sensor units which are embedded in a tire at predetermined intervals in a circumferential direction of the tire and each have a conductor pattern changed in shape according to a distortion of the tire, and a monitoring device having a radiation unit provided in a tire house of a vehicle,characterized in that an electromagnetic wave of a first frequency is radiated from the radiation unit to the sensor unit,the sensor unit having received the electromagnetic wave of the first frequency converts energy of the electromagnetic wave of the first frequency into electric energy and uses the electric energy to drive electromagnetic wave radiating means,according to a distortion of the conductor pattern, the electromagnetic wave radiating means changes a resonance frequency in a frequency band having a predetermined width including a second frequency, which serves as a fundamental frequency, and the electromagnetic wave radiating means radiates the electromagnetic wave, andthe monitoring device receives the electromagnetic wave having been radiated from the electromagnetic wave radiating means of the sensor unit, detects at least one of an intensity, phase, and frequency of the received electromagnetic wave, and detects a distortion of the tire by comparing the detection result and a detection result stored when no distortion occurs on the tire.
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Accused Products
Abstract
A tire distortion detecting method for detecting a detection of the tire during the running of a vehicle, a distortion detector, a sensor unit thereof, and a tire having the same whereby the occurrence of a deterioration can be reduced and applicability is widened to a control system such as a stability control system. Sensor units 100 are embedded at some intervals in the circumferential direction of the tire. In the sensor unit 100, a conductor pattern is changed in shape according to a distortion of a tire 300 so as to change the resonance frequency of a radiated electromagnetic wave. An electromagnetic wave is radiated from a monitoring device 200. An electromagnetic wave radiated from the sensor unit 100 is compared with a detection result stored when no distortion occurs on the tire 300, so that a distortion of the tire 300 is detected.
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Citations
22 Claims
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1. A tire distortion detecting method using a plurality of sensor units which are embedded in a tire at predetermined intervals in a circumferential direction of the tire and each have a conductor pattern changed in shape according to a distortion of the tire, and a monitoring device having a radiation unit provided in a tire house of a vehicle,
characterized in that an electromagnetic wave of a first frequency is radiated from the radiation unit to the sensor unit, the sensor unit having received the electromagnetic wave of the first frequency converts energy of the electromagnetic wave of the first frequency into electric energy and uses the electric energy to drive electromagnetic wave radiating means, according to a distortion of the conductor pattern, the electromagnetic wave radiating means changes a resonance frequency in a frequency band having a predetermined width including a second frequency, which serves as a fundamental frequency, and the electromagnetic wave radiating means radiates the electromagnetic wave, and the monitoring device receives the electromagnetic wave having been radiated from the electromagnetic wave radiating means of the sensor unit, detects at least one of an intensity, phase, and frequency of the received electromagnetic wave, and detects a distortion of the tire by comparing the detection result and a detection result stored when no distortion occurs on the tire.
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6. A tire distortion detector for detecting a distortion of a tire during running of a vehicle,
characterized in that the detector is constituted of a plurality of sensor units embedded in the tire at predetermined intervals in a circumferential direction of the tire, and a monitoring device including a radiation unit provided in a tire house of the vehicle, the sensor unit comprises: -
a conductor pattern of a predetermined shape on a surface of a sheet which is flexible and electrically insulative with a predetermined area, means for receiving an electromagnetic wave of a first frequency from the radiation unit and converting high frequency energy of the electromagnetic wave into electric energy, and means which is operated by the electric energy, is connected to the conductor pattern, changes a resonance frequency, according to a distortion of the conductor pattern, in a frequency band having a predetermined width including a second frequency serving as a fundamental frequency, and radiates an electromagnetic wave, and the monitoring device comprises; means for radiating the electromagnetic wave of the first frequency from the radiation unit to the sensor unit, means for receiving an electromagnetic wave radiated from the sensor unit, means for detecting at least one of an intensity, phase, and frequency of the received electromagnetic wave, means for storing a detection result obtained when no distortion occurs on the tire, and means for detecting a distortion of the tire by comparing the detection result and the detection result obtained when no distortion occurs on the tire. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A sensor unit for a tire distortion detector comprising a plurality of sensor units embedded in the tire at predetermined intervals in a circumferential direction of a tire and a monitoring device having a radiation unit provided in a tire house of a vehicle,
characterized in that the sensor unit comprises: -
a conductor pattern of a predetermined shape on a surface of a sheet which is flexible, and electrically insulative with a predetermined area, means for receiving an electromagnetic wave of a first frequency from the radiation unit and converting high frequency energy of the electromagnetic wave into electric energy, and means which is operated by the electric energy, is connected to the conductor pattern, changes a resonance frequency, according to a distortion of the conductor pattern, in a frequency band having a predetermined width including a second frequency serving as a fundamental frequency, and radiates an electromagnetic wave. - View Dependent Claims (14, 15, 16, 17)
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18. A tire, characterized by comprising a plurality of sensor units embedded in the tire at predetermined intervals in a circumferential direction of the tire,
the sensor unit comprising: -
a conductor pattern of a predetermined shape on a surface of a sheet which is flexible and electrically insulative with a predetermined area, means for receiving an electromagnetic wave of a first frequency from the radiation unit and converting high frequency energy of the electromagnetic wave into electric energy, and means which is operated by the electric energy, is connected to the conductor pattern, changes a resonance frequency, according to a distortion of the conductor pattern, in a frequency band having a predetermined width including a second frequency serving as a fundamental frequency, and radiates an electromagnetic wave. - View Dependent Claims (19, 20, 21, 22)
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Specification