Apparatus for detecting tire inflation pressure
First Claim
1. An apparatus comprising:
- a detecting unit, disposed in an inside of a tire, that is configured to directly detect an inflation pressure of the tire and outputs a detection signal indicating the tire inflation pressure;
a deflation time determining unit that is configured to;
set a predetermined threshold value lower than a normal inflation pressure of the tire such that the inflation pressure of the tire reaching the predetermined threshold value indicates deflation of the tire;
calculate, from the detection signal outputted from the detecting unit, a deflation rate, at which the tire is deflating per unit time, when the inflation pressure detected in the detecting unit is higher than the predetermined threshold value, anddetermine, from the calculated deflation rate, a specific time, at which the tire inflation pressure becomes lower than the predetermined threshold value when the inflation pressure detected in the detecting unit is higher than the predetermined threshold value, or a specific period of time from a base time to the specific time; and
an outputting unit that is configured to output information showing the specific time or information showing the specific period of time.
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Abstract
A sensor detects values of inflation pressure of a tire of a vehicle one after another. A controller calculates, from the values of the tire inflation pressure, a deflation rate at which the tire is deflating per unit time. When the deflation rate is higher than a first predetermined value, the controller judges that the tire is suddenly punctuated. When the deflation rate is not higher than the first predetermined value but is higher than a second predetermined value, the controller judges that the tire is deteriorated. When the deflation rate is not higher than the second predetermined value, the controller judges that compressed air is naturally leaked from the tire. An alarm unit gives an alarm indicating punctuation or deterioration of the tire or natural air leaking in response to the judgment of the controller.
14 Citations
11 Claims
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1. An apparatus comprising:
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a detecting unit, disposed in an inside of a tire, that is configured to directly detect an inflation pressure of the tire and outputs a detection signal indicating the tire inflation pressure; a deflation time determining unit that is configured to; set a predetermined threshold value lower than a normal inflation pressure of the tire such that the inflation pressure of the tire reaching the predetermined threshold value indicates deflation of the tire; calculate, from the detection signal outputted from the detecting unit, a deflation rate, at which the tire is deflating per unit time, when the inflation pressure detected in the detecting unit is higher than the predetermined threshold value, and determine, from the calculated deflation rate, a specific time, at which the tire inflation pressure becomes lower than the predetermined threshold value when the inflation pressure detected in the detecting unit is higher than the predetermined threshold value, or a specific period of time from a base time to the specific time; and an outputting unit that is configured to output information showing the specific time or information showing the specific period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification