Tire pressure detecting system
First Claim
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1. A tire pressure detecting system wherein a tire pressure is detected by an air pressure sensor, comprising:
- a fluctuation warning unit for issuing a warning when fluctuations of the tire pressure per unit time exceed a predetermined threshold fluctuation; and
a detected value warning unit for issuing a warning when a detected value of the tire pressure has fallen to a value below a predetermined threshold detected value.
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Abstract
A fluctuation warning unit for issuing a warning when fluctuations of the tire pressure per unit time exceed a predetermined threshold fluctuation, and a detected value warning unit for issuing a warning when a detected value of the tire pressure has fallen to a value below a predetermined threshold detected value are provided. For example, air leakage may be recognized rapidly, and abnormalities of air pressure may be recognized even when a faint air leakage occurs wherein fluctuations of the tire pressure per unit time do not exceed the predetermined threshold fluctuation.
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Citations
21 Claims
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1. A tire pressure detecting system wherein a tire pressure is detected by an air pressure sensor, comprising:
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a fluctuation warning unit for issuing a warning when fluctuations of the tire pressure per unit time exceed a predetermined threshold fluctuation; and a detected value warning unit for issuing a warning when a detected value of the tire pressure has fallen to a value below a predetermined threshold detected value. - View Dependent Claims (2, 3, 4, 5)
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6. A tire pressure detecting system in which the tire pressure is detected by an air pressure sensor disposed on a wheel side, the detected tire pressure is issued from a transmitter disposed on the wheel side to a receiver disposed on a vehicle body side, and a warning is issued when the received detected tire pressure is outside a predetermined value comprising:
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a temperature sensor for detecting air temperatures in the tire; a pressure converting unit for converting the tire pressure detected by the air pressure sensor into a pressure at a predetermined temperature based on the air temperature detected by the temperature sensor; and a transmission interval varying unit for shortening the interval of issuing a warning to the receiver when the converted pressure supplied from the pressure converting unit has fallen to a value below a predetermined threshold pressure. - View Dependent Claims (7, 8, 9, 10)
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11. A tire pressure detecting system wherein a tire pressure is detected by an air pressure sensor and a warning is issued when the tire pressure lies outside a predetermined value comprising:
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an ambient air pressure sensor for detecting ambient air pressure; a pressure converting unit for converting the tire pressure detected by the air pressure sensor into a pressure under a reference atmospheric pressure based on the ambient air pressure detected by the ambient air pressure sensor; a transmitter disposed within a tire for transmitting pressure information outside the tire and a receiver disposed outside the tire for issuing a warning based on pressure information; and a detected value warning unit for detecting the tire pressure and transmitting a warning based on air leakage that cannot be detected during a slow variation of the tire pressure per unit time, wherein the transmitter includes the air pressure sensor for detecting the air pressure and a fluctuation warning unit calculates fluctuations of the tire pressure per unit time of the air pressure sensor, and wherein said detected value warning unit issues a warning when the detected value of the tire pressure has fallen to a value below the predetermined threshold detected value. - View Dependent Claims (12)
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13. A tire pressure detecting device, comprising:
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an air pressure sensor configured to determine an air pressure of the tire; a fluctuation determining unit configured to determine if fluctuations of the tire pressure per unit time exceed a predetermined fluctuation threshold; a fluctuation warning unit configured to issue a warning when the fluctuation determining unit determines the fluctuations of the tire pressure exceed the predetermined fluctuation threshold. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification