Abstract: A tire internal pressure measuring system includes a detector for detecting the internal pressure of a tire, and an acquisition device for acquiring data relating to the internal pressure of the tire detected by the detector. An antenna unit of the acquisition device generates induced electromotive force in an antenna unit of the detector by electromagnetic induction, and acquires a resonant waveform in tune with the resonance of an LC resonance circuit configured from a capacitance sensor charged with the electromotive force generated in the antenna unit and the antenna unit. The acquired resonant waveform is frequency-divided, and a capacitor (C) is charged during a period from the rising edge to the falling edge of the waveform obtained by the frequency dividing. The value of charged voltage is associated with the tire internal pressure.

Abstract: A tire internal pressure measuring system includes a detector for detecting the internal pressure of a tire, and an acquisition device for acquiring data relating to the internal pressure of the tire detected by the detector. An antenna unit of the acquisition device generates induced electromotive force in an antenna unit of the detector by electromagnetic induction, and acquires a resonant waveform in tune with the resonance of an LC resonance circuit configured from a capacitance sensor charged with the electromotive force generated in the antenna unit and the antenna unit. The acquired resonant waveform is frequency-divided, and a capacitor (C) is charged during a period from the rising edge to the falling edge of the waveform obtained by the frequency dividing. The value of charged voltage is associated with the tire internal pressure.

Abstract: A tire pressure information monitoring system includes a pressure sensor (24) for detecting air pressure within a tire, and a temperature sensor (25) for detecting temperature within the tire. The monitoring system further includes a CPU (21) that operates with a high frequency clock to send command to the pressure sensor (24) and the temperature sensor (25) to acquire internal information of the tire, and thereafter operates with a low frequency clock until stabilizing time of the pressure sensor (24) and the temperature sensor (25) elapses. The CPU then operates with a high frequency clock to transmit the internal information of the tire, which has been acquired by the pressure sensor (24) and the temperature sensor (25), to an external receiver at a constant time interval, and thereafter operates with a low frequency clock until the constant time interval elapses.

Abstract: Provided a building drum capable of accurately control inner pressure of folding bladders and a center bladder, and/or transmitting abnormality of the inner pressure. At least one of the folding bladders and the center bladder has, in a cavity thereof, a sensor module including an inner pressure sensor for measuring pressure in the cavity of the bladder, the sensor module being disposed more inward than the outer surface of the drum body in the radial direction.

Abstract: A tire pressure information monitoring system includes a pressure sensor (24) for detecting air pressure within a tire, and a temperature sensor (25) for detecting temperature within the tire. The monitoring system further includes a CPU (21) that operates with a high frequency clock to send command to the pressure sensor (24) and the temperature sensor (25) to acquire internal information of the tire, and thereafter operates with a low frequency clock until stabilizing time of the pressure sensor (24) and the temperature sensor (25) elapses. The CPU then operates with a high frequency clock to transmit the internal information of the tire, which has been acquired by the pressure sensor (24) and the temperature sensor (25), to an external receiver at a constant time interval, and thereafter operates with a low frequency clock until the constant time interval elapses.

Abstract: A tire sensor device comprising sensor modules 20A to 20D, each comprising a sensor, a communication module having a communication function and a power regenerating circuit, and an antenna; and a base station comprising an internal communication device for communication with the sensor modules 20A to 20D, an information processing device for processing tire information signals from the sensor modules, an external communication device for communicating with a car control device 40 on the car body side and a power source. The sensor modules 20A to 20D and the base station 30 are arranged in the tire and constitute an intra-tire LAN. Tire information signals transmitted from the sensor modules 20A to 20D are processed by the base station 30 and transmitted to the car control device 40 so that appropriate tire information can be obtained and the size and power consumption of the sensor device can be reduced.

Abstract: An electronic device (40) includes a transmitter substrate (43) for generating information to be measured by a sensor (50) arranged in a partitioned space (10) which is partitioned by a tyre (1) and a rim wheel (2), a signal line (45) extended from the transmitter subs/rate (43)to outside of the partitioned space (10) and passing through an inner side of an air valve (30) provided at the rim wheel (2), the signal line (45) being formed by a core wire (45a) made of a conductor and a coaxial cable (45b) covering that core wire (45a), and an antenna (47) for transmitting radio waves containing the information (such as information of the tyre 1) generated by that transmitter substrate (43), the antenna (47) being connected to the signal line (45) and positioned outside the air valve (30).

Abstract: An electronic device 40 includes a transmitter substrate 43 for generating information to be measured by a sensor 50 arranged in a partitioned space 10 which is partitioned by a tyre 1 and a rim wheel 2, a signal line 45 extended from the transmitter substrate 43 to outside of the partitioned space 10 and passing through an inner side of an air valve 30 provided at the rim wheel 2, the signal line 45 being formed by a core wire 45a made of a conductor and a coaxial cable 45b covering that core wire 45a, and an antenna 47 for transmitting radio waves containing the information (such as information of the tyre 1) generated by that transmitter substrate 43, the antenna 47 being connected to the signal line 45 and positioned outside the air valve 30.

Abstract: A tire revolution detecting system includes an electric power generator (23) and an RF tag (27), both provided for the tire (11). The generator (23) generates electric power under deformation of the tire (11) in contact with the ground. The RF tag (27) includes a memory (29) for storing a data indicative of the number of the tire revolution, and serves to (i) add an increment to the data of the memory (29) and renew the stored data each time when the voltage of the electric power generated by the generator (23) exceed a threshold level, and (ii) transmit the data of the memory (29) to an external communication system (34) when the detecting system is connected to the communication system (34) through wireless communication. The generator (23) and the RF tag (27) are provided, respectively, in a sidewall portion (14) and a bead portion (13) of the tire (11).

Abstract: A tire sensor device comprising sensor modules 20A to 20D, each comprising a sensor, a communication module having a communication function and a power regenerating circuit, and an antenna; and a base station comprising an internal communication device for communication with the sensor modules 20A to 20D, an information processing device for processing tire information signals from the sensor modules, an external communication device for communicating with a car control device 40 on the car body side and a power source. The sensor modules 20A to 20D and the base station 30 are arranged in the tire and constitute an intra-tire LAN. Tire information signals transmitted from the sensor modules 20A to 20D are processed by the base station 30 and transmitted to the car control device 40 so that appropriate tire information can be obtained and the size and power consumption of the sensor device can be reduced.

Abstract: A method for directly and accurately estimating friction coefficient of a road surface independently from the slip rate is disclosed. The method measures tangential and vertical forces acting on an elastic body 3 of an elastic wheel 1, and calculates the friction coefficient of a road surface based on the measured values of these forces and angular rate of the wheel 1.

Abstract: A sensor unit body 10 of a tire pressure sensor unit 1 is provided with external signal-importing terminals 22 for rewriting data of self-identification code stored in a ROM 21, so that a complex operation of associating the self-identification code of the sensor unit with its mounting position in the vehicle is eliminated by rewriting the self-identification code of the sensor unit 1 after the replacement to be identical to the self-identification code of the sensor unit 1 before the replacement, when a tire wheel is replaced due to a breakdown of the tire unit or a replacement between a summer tire and a winter tire.

Abstract: A method for directly and accurately estimating friction coefficient of a road surface independently from the slip rate is disclosed. The method measures tangential and vertical forces acting on an elastic body 3 of an elastic wheel 1, and calculates the friction coefficient of a road surface based on the measured values of these forces and angular rate of the wheel 1.

Abstract: A sensor unit body 10 of a tire pressure sensor unit 1 is provided with external signal-importing terminals 22 for rewriting data of self-identification code stored in a ROM 21, so that a complex operation of associating the self-identification code of the sensor unit with its mounting position in the vehicle is eliminated by rewriting the self-identification code of the sensor unit 1 after the replacement to be identical to the self-identification code of the sensor unit 1 before the replacement, when a tire wheel is replaced due to a breakdown of the tire unit or a replacement between a summer tire and a winter tire.