Tire Sensor Wireless Link via Reflection Plate
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Solution Overview
Problem
Existing tire sensor systems face challenges in maintaining a reliable wireless connection between a tire-mounted RFID transponder and a vehicle body reader/writer due to rotational position changes, increased distance, and directional deviations, leading to reduced detection sensitivity and increased energy consumption.
Innovation Solution
A tire sensor system with a control unit on the vehicle body and a sensor unit in the tire, utilizing a reflection member to relay a varying transmission electromagnetic field, ensuring consistent wireless connection and low energy consumption, regardless of tire rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tire rotates from the optimal position, then the wireless connection becomes unstable, but increasing transmission output increases energy consumption
Solution Approach 1:
A reflection member (metallic plate) is introduced as an intermediary to relay electromagnetic fields between the reader/writer and RFID transponder. This mediator enables stable communication by reflecting signals around obstacles rather than requiring direct line-of-sight, solving the connection instability problem without increasing transmission power.
2Reliability
If the distance between reader/writer and RFID transponder increases, then connection reliability decreases, but maintaining direct connection requires high transmission output
Solution Approach 1:
The reflection member enables signal propagation through a different spatial path by reflecting electromagnetic waves around the tire structure. This dimensional change in signal routing allows communication across greater distances and through obstacles without requiring high transmission power.
3Reliability
If component members of the tire are positioned between reader/writer and RFID transponder, then electromagnetic field transmission is blocked, but increasing power consumption is required to maintain connection
Solution Approach 1:
The reflection member acts as a mediator that redirects electromagnetic fields around interfering component members of the tire. By reflecting signals along alternative paths, it maintains reliable transmission through the tire structure without requiring increased power consumption to penetrate obstacles.
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
The system achieves high sensitivity in detecting tire sensor output with reduced energy consumption by using a reflection member to maintain a stable wireless connection between the control unit and sensor unit, even when the tire rotates, thereby overcoming previous connection issues.
Implementation Method 1
the reflection member reflects the transmission electromagnetic field from the control unit, and relays the wireless connection between the control unit and the sensor unit
Implementation Method 2
the control unit generates a transmission electromagnetic field that varies with time and senses electromagnetic field fluctuations produced by the sensor unit
Data Source
AI summary
The position of the rotation of a tire complicates the establishing of a wireless connection between a sensor unit attached to the tire and a sensor control unit attached to a vehicle body.A reflection plate is attached to an inner surface of a wheel housing at a position different from that of a sensor control unit. A transmission electromagnetic field from the sensor control unit is reflected by the metal reflection plate and transmitted to a sensor unit rotated to a position to which the field does not readily reach directly from the sensor control unit. The sensor unit varies an impedance of a coil antenna in accordance with transmission data, and generates a variation in the transmission electromagnetic field. The variation is detected via the reflection plate as a variation in a transmission load of the sensor control unit, and the transmission data from the sensor unit is detected in the sensor control unit.