Tire air pressure transmission device and tire air pressure monitor system
First Claim
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1. A tire air pressure transmission device installed on a wheel comprising:
- a tire air pressure detection mechanism that detects a tire air pressure of the wheel;
an acceleration detection mechanism that detects a centrifugal acceleration while the wheel rotates;
a gravitational acceleration component detection mechanism that sets sampling periods based on the centrifugal acceleration and detects a value of a gravitational acceleration component of the centrifugal acceleration at each sampling period, whereina detected tire air pressure information is transmitted in a wireless signal when the gravitational acceleration component of the centrifugal acceleration has reached a predetermined value.
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Abstract
A tire air pressure transmission device is provided that is configured to set a sampling period or cycle based on a centrifugal acceleration of a wheel in the centrifugal direction, and to detect the value of the gravitational acceleration component of the centrifugal acceleration at each set sampling period.
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Citations
18 Claims
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1. A tire air pressure transmission device installed on a wheel comprising:
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a tire air pressure detection mechanism that detects a tire air pressure of the wheel; an acceleration detection mechanism that detects a centrifugal acceleration while the wheel rotates; a gravitational acceleration component detection mechanism that sets sampling periods based on the centrifugal acceleration and detects a value of a gravitational acceleration component of the centrifugal acceleration at each sampling period, wherein a detected tire air pressure information is transmitted in a wireless signal when the gravitational acceleration component of the centrifugal acceleration has reached a predetermined value. - View Dependent Claims (2, 3)
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4. A tire air pressure monitoring system for monitoring a tire air pressure of each wheel comprising:
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a tire air pressure detection mechanism installed on the tire of each wheel to detect the tire air pressure; an acceleration detection mechanism installed on each wheel to detect a centrifugal acceleration while the wheel is rotating; a gravitational acceleration component detection mechanism that sets sampling periods based on the centrifugal acceleration and detects a value of a gravitational acceleration component of the centrifugal acceleration at each sampling period; a transmitter that transmits detected tire air pressure information in a wireless signal with identification information unique to each transmitter when the value of the gravitational acceleration component has reached a predetermined value; a receiver installed on a vehicle body to receive the wireless signal; a rotational position detection mechanism installed on the vehicle body corresponding to each wheel to detect a rotational position of each wheel, and a wheel position determination mechanism that determines the position of the wheel to which the transmitter is installed based on the rotational position of each wheel at the time when the wireless signal including the identification information is transmitted. - View Dependent Claims (5, 6)
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7. A tire air pressure transmission device installed on a wheel, comprising:
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a tire air pressure detection mechanism that detects a tire air pressure of the wheel; a rotation frequency detection mechanism that detects a rotation frequency of the wheel; a rotational position detection mechanism on the wheel that sets sampling periods based on the rotation frequency and detects a rotational position of the wheel at each sampling period, wherein detected tire air pressure information is transmitted in a wireless signal when the rotational position of the wheel assumes a predetermined position. - View Dependent Claims (8, 9)
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10. A tire air pressure monitoring system for monitoring an air pressure of each tire comprising:
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a tire air pressure detection mechanism installed on a tire of each wheel that detects tire air pressure; a rotation frequency detection mechanism installed on each wheel that detects a rotation frequency of the wheel; a rotational position detection mechanism on each wheel that sets sampling periods based on the rotation frequency and detects a rotational position of the wheel at each set sampling period; a transmitter that transmits a wireless signal of detected tire air pressure information with identification information unique to each transmission; a receiver installed on a vehicle body to receive the wireless signal; a rotational position detection mechanism installed on the vehicle body in correspondence with each wheel that detects the rotational position of each wheel; and a wheel position determination mechanism that determines a position of the wheel to which the transmitter is installed based on the rotational position of each wheel detected by the rotational position detection mechanism when the wireless signal containing the identification information has been transmitted. - View Dependent Claims (11, 12)
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13. A tire air pressure transmission device installed on a wheel comprising:
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a tire air pressure detection mechanism that detects a tire air pressure of the wheel; an acceleration detection mechanism that detects a centrifugal acceleration while the wheel is rotating; a gravitational acceleration detection mechanism that detects a value of a gravitational acceleration component of the centrifugal acceleration by detecting the gravitational acceleration component at each first sampling period set based on the centrifugal acceleration during a first period of the gravitational acceleration component, and in second and subsequent periods following the first period, by detecting the gravitational acceleration component at each second sampling period set based on the gravitational acceleration component detected in the first period, and, after transmission of the wireless signal, stopping to detect the value of the gravitational acceleration component, wherein, when the value of the gravitational acceleration component of the centrifugal acceleration has reached a predetermined value, the detected tire air pressure information is transmitted in a wireless signal. - View Dependent Claims (14, 15)
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16. A tire air pressure monitoring system for monitoring an air pressure of each tire comprising:
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a tire air pressure detection mechanism installed on a tire of each wheel that detects a tire air pressure; an acceleration detection mechanism installed on each wheel that detects a centrifugal acceleration while the wheel is rotating; a gravitational acceleration detection mechanism that detects a value of the gravitational acceleration component of the centrifugal acceleration by detecting a gravitational acceleration component at each first sampling period set based on the centrifugal acceleration during a first period of gravitational acceleration component whereas, in the second and subsequent periods following the first period, by detecting the gravitational acceleration component at each second sampling period set based on the gravitational acceleration component detected in the first period, and, after transmission of the wireless signal, stopping to detect the value of the gravitational acceleration component, wherein, when the value of the gravitational acceleration component of the centrifugal acceleration has reached a predetermined value; and a transmitter that transmits a wireless signal of the detected tire air pressure information with identification information unique to each transmission when the value of the gravitational acceleration component of the centrifugal acceleration has reached a predetermined value. - View Dependent Claims (17, 18)
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Specification