Tire condition monitoring system
First Claim
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1. A system for automatically detecting an abnormal condition of a vehicle tire, comprising:
- a sensor rotatable with the tire for detecting the abnormal condition;
a rotatable coil concentrically mounted on a framework of a wheel on which the tire is fitted and connected in a series circuit arrangement with said sensor so that the impedance of the series circuit is reduced below a predetermined value by said sensor in response to the detected abnormal condition;
an oscillator mounted on the vehicle structure including a pair of separate coils mounted adjacent to and on the inner side of said rotatable coil for inductive coupling therewith through said rotatable coil when the impedance of the series circuit is below said predetermined value;
said pair of coils being spaced apart to face separate peripheral areas of said rotatable coilS; and
an alarm device connected to said oscillator to produce a warning signal in response to oscillation therein;
whereby when the impedance of the series circuit is below said predetermined value, inductive coupling between said fixed and rotatable coils allows sufficient feedback for said oscillator to produce oscillation therein.
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Abstract
A tire mounted sensor and rotatable coil are connected in series and a switch in the sensor closes when the tire pressure is low or the temperature is excessive. A feedback coil of an oscillator is mounted on the vehicle structure in such a manner as to be adjacent to the rotatable coil, and inductive coupling between the coils produces oscillation in the oscillator when alarm light or buzzer is energized in response to oscillation in the oscillator.
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Citations
1 Claim
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1. A system for automatically detecting an abnormal condition of a vehicle tire, comprising:
- a sensor rotatable with the tire for detecting the abnormal condition;
a rotatable coil concentrically mounted on a framework of a wheel on which the tire is fitted and connected in a series circuit arrangement with said sensor so that the impedance of the series circuit is reduced below a predetermined value by said sensor in response to the detected abnormal condition;
an oscillator mounted on the vehicle structure including a pair of separate coils mounted adjacent to and on the inner side of said rotatable coil for inductive coupling therewith through said rotatable coil when the impedance of the series circuit is below said predetermined value;
said pair of coils being spaced apart to face separate peripheral areas of said rotatable coilS; and
an alarm device connected to said oscillator to produce a warning signal in response to oscillation therein;
whereby when the impedance of the series circuit is below said predetermined value, inductive coupling between said fixed and rotatable coils allows sufficient feedback for said oscillator to produce oscillation therein.
- a sensor rotatable with the tire for detecting the abnormal condition;
Specification
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Current AssigneeAkio Hosaka
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Original AssigneeAkio Hosaka
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InventorsHosaka, Akio
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Primary Examiner(s)Waring, Alvin H.
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Application NumberUS05/452,470Time in Patent Office505 DaysField of Search340/58 200/61.22,61.25US Class Current340/448CPC Class CodesB60C 23/0428 using passive wheel mounted...
