The present invention relates to a design of a wireless power transmission system and a method for controlling an optimal resonance frequency applied to the system, and provides a wireless power transmission system and a method for controlling an optimal resonance frequency applied to the system, wherein, by a method of designing a power transmission unit to match a frequency control range and by designing a quality factor (Q) of a resonance unit of a power reception unit to be low so that the difference in power reception performance is not large within the control frequency range, power can be received stably even if there is a change in resonance frequencies of a wireless power transmission system installed in a metal environment, and the system frequency can be easily and quickly controlled so as to search for and find the optimal resonance frequency.

The present invention relates to a wireless power transmission or reception system for measuring a valid charging time in which a voltage value measured by a reception unit is equal to or greater than a pre-configured voltage value, and controlling transmission power so that the valid charging time is included in a pre-configured target charging time range.

The present invention relates to a design of a wireless power transmission system and a method for controlling an optimal resonance frequency applied to the system, and provides a wireless power transmission system and a method for controlling an optimal resonance frequency applied to the system, wherein, by a method of designing a power transmission unit to match a frequency control range and by designing a quality factor (Q) of a resonance unit of a power reception unit to be low so that the difference in power reception performance is not large within the control frequency range, power can be received stably even if there is a change in resonance frequencies of a wireless power transmission system installed in a metal environment, and the system frequency can be easily and quickly controlled so as to search for and find the optimal resonance frequency.

A wirelessly powered sensor system includes a wireless receiver that monitors tire pressure and is capable of broadcasting a short-range radio frequency (RF) signal indicating low tire pressure configured to be received at a vehicle; a rechargeable battery electrically coupled to the wireless receiver; and an RF to direct current (DC) power converter electrically coupled to the rechargeable battery and configured to receive RF power wirelessly supplied by a wireless power transmitter.

The present invention is directed to a wheel sensor system for a vehicle, comprising wheel sensor assemblies; a connector electrically connectable to a vehicle diagnostics system so as to be powered by the vehicle diagnostics system; and at least one electromagnetic energy transmitter for wirelessly transmitting electromagnetic energy received via the connector to each wheel sensor assembly. Each wheel sensor assembly comprises at least one sensor for measuring a property of a vehicle wheel; a sensor assembly antenna for wirelessly receiving the electromagnetic energy transmitted by the electromagnetic energy transmitter; and a converter for converting the electromagnetic energy received by the sensor assembly antenna into an electrical current for powering one or more components of the sensor assembly. Furthermore, the invention is directed to a vehicle comprising the wheel sensor system.

An in-wheel sensor system for a heavy-duty vehicle is integrated with a wheel. One or more in-wheel sensors are attached to or mounted inside the wheel to obtain in-wheel sensor data. A control unit is mounted inside the wheel to process the obtained in-wheel sensor data and transmit the processed data to an external device. A power supply transfers electrical power to the in-wheel system, and is at least partly located external to the wheel.

The present disclosure relates to a tire monitoring sensor, a system and a method for controlling the same. The system according to an embodiment of the present disclosure is provided in a vehicle, and may include: a tire monitoring sensor (TMS) comprising a battery and mounted on a tire or wheel of the vehicle, and detecting a condition of the tire; and a main transceiver provided at a position spaced apart from the TMS in the vehicle. The main transceiver comprises a plurality of coils configured to generate first magnetic fields by application of an alternating current. The plurality of coils is disposed such that the first magnetic fields are applied to the TMS sequentially according to a rotation of the tire or the wheel. The alternating current is applied to the plurality of coils such that adjacent first magnetic fields have opposite phases.