Pneumatic Tire Receiver Coil Layout for Efficient Wireless Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pneumatic tire power supply systems face low transmission efficiency when wirelessly supplying power to sensors and transmission devices due to the placement of secondary coils, which limits the duration of operation and requires complex battery replacement processes.
Innovation Solution
A pneumatic tire design incorporating a receiver coil configured to receive an AC magnetic field, strategically positioned between the bead core and belt layer, with a planar shape and spiral signal lines on a flexible substrate, optimized for higher power transmission efficiency using magnetic field resonance method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If secondary coils are embedded adjacent to each other in the entire periphery of the inner circumferential surface of the sidewall, then power can be supplied to sensors and transmission devices, but transmission efficiency is low and power cannot be supplied sufficiently
Solution Approach 1:
The patent extracts the secondary coil from the conventional placement on the inner circumferential surface of the sidewall and repositions it to the outer circumferential surface of the sidewall. This extraction from the problematic location and placement in a new location resolves the low transmission efficiency issue while maintaining the power supply function to sensors and transmission devices.
Solution Approach 2:
The patent changes the spatial dimension of secondary coil placement from the inner circumferential surface (inside the tire structure) to the outer circumferential surface (outside the tire structure). This dimensional change allows the secondary coil to be positioned where it can more effectively receive magnetic fields from the primary coil, thereby improving transmission efficiency.
2Use of energy by moving object
If a battery is built in the transmission device, then power can be supplied to sensors and transmission devices, but the sensor and transmission device cannot be driven semipermanently and complicated battery replacement is required
Solution Approach 1:
The patent replaces the mechanical battery-based power supply system with a wireless power transmission system using magnetic coupling between primary and secondary coils. This substitution eliminates the need for batteries, enabling semipermanent operation without battery replacement while continuously supplying power to sensors and transmission devices.
3Area of stationary object
If receiver coil is disposed close to bead core and belt layer, then space utilization is improved, but magnetic field reception is interfered with by steel materials
Solution Approach 1:
The patent extracts the receiver coil from the conventional placement on the inner circumferential surface of the sidewall and repositions it to the outer circumferential surface of the sidewall. This extraction removes the coil from the interference zone of steel materials (bead core and belt layer) while maintaining effective space utilization in the tire cavity region for wireless power reception.
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 solution enhances power transmission efficiency to sensors and devices within the tire, allowing for longer operation without battery replacement and simplifying maintenance by improving the placement of receiver coils for better magnetic field reception.
Implementation Method 1
a receiver coil formed in a planar shape and provided in a tire cavity region of the pneumatic tire, the receiver coil including a receiving region formed in a planar shape and configured to receive an AC magnetic field transmitted through the carcass ply layer, the receiver coil being configured to generate an AC signal by receiving the AC magnetic field
Implementation Method 2
configured to receive an AC (alternating current) magnetic field from an outside of the pneumatic tire
Data Source
AI summary
A pneumatic tire includes a planar-shaped receiver coil in a cavity region, and configured to receive a magnetic field through a carcass ply layer and generate a signal, and an element to receive power converted from the signal. A receiving region of the receiver coil is interposed between an outermost side of a bead core in the radial direction and an innermost side of a belt layer in the radial direction, and the receiving region faces in the width direction. When a maximum dimension of the receiving region along the radial direction of the receiver coil is a length D1, a distance from the receiving region to a nearest portion of the bead core to the receiving region is L1, and a distance from the receiving region to a nearest portion of the belt layer to the receiving region is L2, relationships L1>(D1/4) and L2>(D2/4) are satisfied.