A 2.4G signal encoding wake-up operation tire pressure detector includes a first TPMS-MCU electrically connected to a first TPMS memory unit, a first TPMS communication interface, a first TPMS main controller, and a TPMS high-frequency transceiver module. The TPMS high-frequency transceiver module includes a TPMS-BLE radio frequency unit, a TPMS-OOK radio frequency unit, and a TPMS high-frequency antenna. The TPMS-BLE radio frequency unit, the TPMS-OOK radio frequency unit, and the TPMS high-frequency antenna use a shared circuit. A second TPMS-MCU is electrically connected to a second TPMS memory unit, a second TPMS communication interface, a second TPMS main controller and the first TPMS-MCU. The first TPMS-MCU and the second TPMS-MCU do not contain TPMS low-frequency circuits or TPMS low-frequency antennas, and the low frequency is less than or equal to 150 KHz. This invention eliminates the need for using both high-frequency antennas and low-frequency antennas simultaneously.

A tire pressure monitoring unit includes a pressure sensor, a temperature sensor, a transmitter for wireless transmission of pressure and temperature data HF signals, a receiver for receiving wireless control LF signals, a microcontroller containing a program memory and a data storage device containing a library of control programs to control the measurement and transmission activity of the tire pressure monitoring unit. The microcontroller selects from this library, on the basis of control signals that are received, a control program and then writing it into its program memory. When a loading program is activated by a control signal, it causes the microcontroller to transfer into the data storage device an additional control program that is received by the receiver. A method includes adding, to a library of control programs in a data storage device connected to a microcontroller of a tire pressure monitoring unit, an additional control program.

The invention relates to a communication method for a monitoring system comprising a wheel unit (16a, 16b, 16c, 16d) intended to communicate with an electronic control unit (12) by way of Bluetooth Low Energy communication in order to establish two-way communication between the wheel unit and the electronic control unit, the wheel unit being able to transmit periodic signals of short duration to attempt to connect to the electronic control unit, the electronic control unit being able to acknowledge the periodic signals by transmitting a frame of radiofrequency signals to the wheel unit. The method comprises a step of automatically adapting the radiofrequency transmission power of the wheel unit when the wheel unit is in advertising mode, during which the wheel unit transmits signals of variable radiofrequency power so as to determine a minimum radiofrequency power starting from which the electronic control unit is capable of acknowledging at least one signal by transmitting a frame of radiofrequency signals to the wheel unit.

Figure for the abstract: FIG. 1

A wheel assembly rotational position identifying apparatus includes an acceleration detector, a control section, and a battery. The control section identifies the rotational position of the wheel assembly based on an acceleration detected by the acceleration detector. The control section operates in a control mode that is a selected one of a normal mode and a power saving mode, in which a power consumption associated with identification of the rotational position of the wheel assembly is smaller than that in the normal mode. The control section switches the control mode to the normal mode when an initiation condition is met in accordance with an input from outside. The control section also switches the control mode to the power saving mode when a termination condition is met in the normal mode.

A first signal transmission is received from a transmitter external to the monitor, the first signal having a transmission characteristic. Based upon the transmission characteristic of the first signal transmission and not any data in the first transmission, a corresponding at least one protocol is determined. A data resolution based upon the transmission characteristic is determined. A second data transmission is formed according to the corresponding at least one protocol, and the sensed data is inserted into the second data transmission according to the resolution. The second data transmission is transmitted.

A communication method for a monitoring system including a wheel unit intended to communicate with an electronic control unit by way of Bluetooth Low Energy communication in order to establish two-way communication between the wheel unit and the electronic control unit. The wheel unit being able to transmit periodic signals of short duration to attempt to connect to the electronic control unit. The electronic control unit being able to acknowledge the periodic signals by transmitting a frame of radiofrequency signals to the wheel unit. The method includes automatically adapting the radiofrequency transmission power of the wheel unit when the wheel unit is in advertising mode, during which the wheel unit transmits signals of variable radiofrequency power so as to determine a minimum radiofrequency power starting from which the electronic control unit is capable of acknowledging at least one signal by transmitting a frame of radiofrequency signals to the wheel unit.