TPMS Sensor Transceiver RF Burst Detection
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Solution Overview
Problem
Conventional tire pressure monitoring systems (TPMS) cannot detect tire pressure immediately after the vehicle is parked, as they only operate when the ignition switch is on, and require additional antennas for LF wave transmission, increasing costs and current consumption.
Innovation Solution
A TPMS with sensor transceivers and a vehicle-body system that use RF waves, including UHF, to detect tire pressure earlier by transitioning into a state capable of continuous RF reception upon a burst signal, reducing current consumption and eliminating the need for LF wave transmission antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If RF reception is continuously performed to enable earlier tire pressure detection, then the response speed is improved, but the current consumption increases
Solution Approach 1:
The sensor transceiver performs RF reception periodically rather than continuously. The reception unit alternates between active reception periods and sleep periods, enabling the system to detect tire pressure events timely while significantly reducing power consumption compared to continuous reception.
Solution Approach 2:
The reception unit is pre-configured to wake up and perform reception at predetermined intervals before actual tire pressure events occur. This preliminary periodic activation ensures that when a tire pressure change happens, the system is already in a state to detect it, eliminating the need for continuous monitoring.
2Speed
If LF wave transmission antennas are installed near each wheel to enable earlier tire pressure detection, then the response speed is improved, but the device complexity increases
Solution Approach 1:
The patent merges the LF wave transmission and RF wave transmission functions into a single antenna system. The sensor transceiver uses the same antenna for both LF reception (from the vehicle body) and RF transmission (to the vehicle body), eliminating the need for separate LF transmission antennas near each wheel and reducing overall system complexity.
Solution Approach 2:
The antenna in the sensor transceiver is designed to be multi-functional, serving both as an LF reception antenna and an RF transmission antenna. This universal antenna design allows the system to achieve early tire pressure detection without requiring additional dedicated LF transmission antennas, thereby reducing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables earlier detection of tire pressure without increasing current consumption or requiring additional antennas, allowing for efficient and cost-effective monitoring.
Implementation Method 1
a first transmission unit configured to transmit the frame prepared by the first control unit on RF waves
Implementation Method 2
a second reception unit configured to receive a received frame that is a frame transmitted from each of the sensor transceivers
Data Source
AI summary
A sensor transceiver transitions into a first state that is capable of receiving RF waves intermittently. Upon starting to receive a burst signal on RF waves from a vehicle-body system under the first state, the sensor transceiver transitions into a second state that is capable of receiving RF waves continuously. Upon receiving a request signal on RF waves from the vehicle-body system under the second state, the sensor transceiver transmits data on tire pressure to the vehicle-body system.