Tire information transmitter and tire information acquisition system using the transmitter
First Claim
1. A tire information transmitter comprising:
- a sensor unit having a pressure sensor for measuring a pressure in a tire cavity region;
a control unit for comparing the measured pressure to a first threshold value and a second threshold value to generate i) an operation signal indicating that the tire information transmitter is operating after measurement of the pressure is started and until the measured pressure reaches the first threshold, and ii) a pressure signal representing the measured pressure after the measured pressure exceeds the first threshold; and
a transmitting unit for wirelessly transmitting the pressure signal or the operation signal;
wherein the control unit controls the transmitting unit in such a way that the transmitting unit transmits the operation signal after the measurement of the pressure is started and until the measured pressure reaches the first threshold, and controls the transmitting unit in such a way that the transmitting unit transmits the pressure signal and wherein the control unit further controls a frequency at which the transmitting unit transmits the pressure signal based upon whether the measured pressure falls below the second threshold value after the measured pressure exceeds the first threshold value; and
wherein the second threshold value is greater than the first threshold value.
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Accused Products
Abstract
A tire information transmitter measures ambient information in a tire cavity region including at least pressure to wirelessly transmit to outside the tire cavity region. The tire transmitter comprises: a sensor unit having a pressure sensor for measuring a pressure in the tire cavity region; a control unit for comparing a level of a pressure signal representing pressure measured by the sensor unit with a threshold value and for generating an operation signal indicating that the tire information transmitter is operating; and a transmitting unit for wirelessly transmitting the pressure signal or the operation signal. The control unit controls the transmitting of the transmitting unit and compares the level of the pressure signal with the threshold value continually after a supply of driving power is started, and has a comparing mode in which the transmitting unit transmits the operation signal at a first time interval, and a transmitting mode in which the transmitting unit transmits the pressure signal at a second time interval which is shorter than the first time interval. Further, the control unit irreversibly shifts from the comparing mode to the transmitting mode, once the level of the pressure signal exceeds the threshold value, as a result of the comparing.
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Citations
15 Claims
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1. A tire information transmitter comprising:
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a sensor unit having a pressure sensor for measuring a pressure in a tire cavity region; a control unit for comparing the measured pressure to a first threshold value and a second threshold value to generate i) an operation signal indicating that the tire information transmitter is operating after measurement of the pressure is started and until the measured pressure reaches the first threshold, and ii) a pressure signal representing the measured pressure after the measured pressure exceeds the first threshold; and a transmitting unit for wirelessly transmitting the pressure signal or the operation signal; wherein the control unit controls the transmitting unit in such a way that the transmitting unit transmits the operation signal after the measurement of the pressure is started and until the measured pressure reaches the first threshold, and controls the transmitting unit in such a way that the transmitting unit transmits the pressure signal and wherein the control unit further controls a frequency at which the transmitting unit transmits the pressure signal based upon whether the measured pressure falls below the second threshold value after the measured pressure exceeds the first threshold value; and wherein the second threshold value is greater than the first threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of monitoring a tire, comprising:
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measuring a pressure in a tire cavity region; comparing the measured pressure to a first threshold value and a second threshold value to generate i) an operation signal indicating that a tire information transmitter is operating after measurement of the pressure is started and until the measured pressure reaches the first threshold, and ii) a pressure signal representing the measured pressure after the measured pressure exceeds the first threshold; wirelessly transmitting the generated pressure signal or the generated operation signal from the tire information transmitter; and controlling a frequency of the transmitting at which the pressure signal is transmitted based upon whether the measured pressure falls below the second threshold value after the measured pressure exceeds the first threshold value and wherein the second threshold value is greater than the first threshold value. - View Dependent Claims (10, 11, 12)
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13. A tire information transmitter, comprising:
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means for measuring a pressure in a tire cavity region; means for comparing the measured pressure to a first threshold value and a second threshold value to generate i) an operation signal indicating that the tire information transmitter is operating after measurement of the pressure is started and until the measured pressure reaches the first threshold, and ii) a pressure signal representing the measured pressure after the measured pressure exceeds the first threshold; means for wirelessly transmitting the pressure signal or the operation signal; and means for controlling the transmitting means in such a way that the transmitting means transmits the operation signal after the measurement of the pressure is started and until the measured pressure reaches the first threshold, and controlling the transmitting means in such a way that the transmitting means transmits the pressure signal and wherein the controlling means further controls a frequency of the transmitting at which the transmitting means transmits the pressure signal based upon whether the measured pressure falls below the second threshold value after the measured pressure exceeds the first threshold value and wherein the second threshold value is greater than the first threshold value. - View Dependent Claims (14, 15)
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Specification