A wheel comprising a rim carrying a tire that co-operates with the rim to define an inside volume, the wheel comprising a pressure measurement device comprising an electronic control circuit that is connected to a pressure sensor, to an absence-of-movement sensor for sensing that the wheel is not moving and to an electronic circuit for wireless communication, the pressure measurement device being arranged to cause pressure to be measured while the wheel is detected as not moving. A pressure measurement device and an associated measurement method.

A first tire pressure sensor module is configured to provide information related to a pressure of a tire of a vehicle and comprises a pressure sensor configured to determine the information related to the pressure of the tire. The pressure module further includes a controller configured to selectively operate the tire pressure sensor module in an active state and in an inactive state, wherein an energy consumption of the tire pressure sensor module is lower in the inactive state than in the active state. The controller is further configured to control an output of the information related to the pressure of the tire in the active state, and operate the tire pressure sensor module in the inactive state based on determining that information related to a velocity of the tire indicates a velocity above a threshold.

A wireless tire pressure monitor system configured for transmitting tire pressure information of a tire of a vehicle is described. The wireless tire pressure monitor system comprises a vehicle-based receiver, at least one tire pressure sensor configured to be mounted inside the tire and configured to measure the air pressure within the tire, and a transmitter electronically connected to the tire pressure sensor and configured to transmit a signal comprising the tire pressure information to the vehicle-based receiver. The wireless tire pressure monitor system is configured to transmit the signal in a first transmission mode from the transmitter to the vehicle-based receiver when the tire is rotating, and transmit the signal in a second transmission mode from the transmitter to the vehicle-based receiver when the tire is stationary. Moreover a method of transmitting tire pressure information employing a wireless tire pressure monitor system is described.

A transmitter is configured to be attached to each of wheel assemblies provided in a vehicle and execute a process in accordance with a command included in a trigger signal transmitted from a trigger device. The transmitter includes a battery, a condition detecting section, which detects a condition of the transmitter, a trigger receiving section, which receives, as the trigger signal, an unmodulated wave having a received signal strength indication greater than or equal to a predetermined received signal strength indication, a transmitting section, which transmits a signal, a controlling section, which performs response transmission, by which the signal is transmitted to the transmitting section in response to the unmodulated wave, when the trigger receiving section receives the unmodulated wave, and a memory section, which stores at least one of reception time of the unmodulated wave and a number of times of the response transmission.

A tire pressure detection apparatus includes: a transmitter at each of a plurality of wheels with a tire; and a receiver at a vehicle body. The transmitter has: a sensing device having a pressure sensor outputting a detection signal related to a tire pressure of each of the plurality of wheels and an acceleration sensor detecting an acceleration including a centrifugal acceleration caused by rotation of the wheel and a gravitational acceleration; a first controller performing signal processing on the detection signal of the pressure sensor and creating a frame storing data related to the tire pressure; and a radio wave transmitter transmitting the frame. The receiver has: a radio wave receiver receiving the frame; and a second controller detecting a tire pressure based on the data related to the tire pressure stored in the received frame.

An apparatus for determining a state parameter of an object to be monitored comprises a means for providing a plurality of measurement values, wherein the measurement values comprise information relating to the state parameter of the object to be monitored, a comparison means for comparing the measurement value to a predeterminable comparison parameter, wherein the comparison means is formed to output a first comparison signal when a predeterminable number of measurement values falls below the comparison parameter within a measurement interval, or to output a second comparison signal when the predeterminable number of measurement values exceeds or reaches the comparison parameter, wherein the first comparison signal or the second comparison signal indicate the state parameter.

A tire pressure monitoring device for a wheeled vehicle that is capable of detecting vehicle motion from the output of a pressure sensor. The device determines from the output signal an indication of the power of the signal, for example the variance of the signal, and detects if the vehicle is stationary or in motion depending on the determined indication of power. The device may determine that the vehicle is in motion if the determined indication of power exceeds a threshold value.

Each of transmitters attached to respective wheel assemblies transmits transmission data when the wheel assembly reaches any of specific angles set at equal angular intervals. A receiver mounted in the vehicle obtains the rotation angles of the wheel assemblies from a rotation angle detecting section upon reception of the transmission data and obtains specific rotation angles by correcting the obtained rotation angles by using the value of the angle difference between the specific angles. The specific rotation angles are values that can be regarded as rotation angles that are obtained upon reception of the transmission data transmitted at the same specific angle. The receiver identifies the correspondence between ID codes included in the transmission data and the wheel assemblies by using the specific rotation angles.

An electronic wheel unit for arrangement on a vehicle wheel of a vehicle, having at least one sensor for detecting at least one wheel operational parameter, a control device, which is designed to generate wheel operational data on the basis of the at least one wheel operational parameter, a radio device for transmitting radio data signals containing the wheel operational data, a power supply device for supplying electrical power to the wheel unit which has an energy-harvesting device for converting mechanical energy captured on a rotation of the vehicle wheel into electrical energy and an electric battery, wherein the electronic wheel unit furthermore has a switchover device for switching over between the energy-harvesting device, and the electric battery for the electrical power supply to the wheel unit, and the switchover device has an actuable switch and an actuating device for actuating the switch, wherein the at least one wheel operational parameter comprises an acceleration parameter, and the actuating device effects the switchover depending on the acceleration parameter or a parameter derived therefrom.

A method for operating a monitoring device for at least one vehicle parameter, in particular an air-pressure sensor for the tire-pressure vehicle parameter. The monitoring device is operated in a drive mode or in a stationary mode as a function of the velocity of the vehicle. Connection signals for the wireless connection to an external device, in particular a configuration device for the monitoring device, are transmitted in the stationary mode. Prior to the change to the stationary mode, the monitoring device is operated in a first intermediate mode. A passive search for wireless connection signals from the external device is carried out in the first intermediate mode.