Wireless Charging Mount FOB Key Position Detection
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Solution Overview
Problem
In wireless charging systems, the interference between low-frequency signals used for FOB key detection and wireless charging can lead to erroneous information and system malfunctions, particularly when the FOB key is positioned near the wireless charging mount, causing inefficient energy transfer and potential user alerts.
Innovation Solution
The method involves transmitting a first low-frequency signal to inform the peripheral region of the wireless charging mount that charging is in progress and having the FOB key respond with a radio frequency signal to the controller, which then stops the charging and alerts the user, ensuring accurate positioning and preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging is performed using electromagnetic coupled resonance, then power transmission efficiency is improved, but interference with FOB key detection signals occurs when the FOB key is positioned near the charging mount
Solution Approach 1:
The system performs FOB key detection before initiating wireless charging to ensure the key is not positioned near the charging mount. This preliminary check prevents signal interference from occurring in the first place, allowing efficient wireless charging to proceed without disruption when conditions are appropriate.
Solution Approach 2:
The system continuously monitors the charging environment and detects when an FOB key enters the peripheral region of the wireless charging mount. Upon detection, it provides feedback by stopping the wireless charging operation, thereby preventing signal interference while maintaining efficient power transmission when no interference risk exists.
2Measurement precision
If the FOB key detection range is expanded to cover the wireless charging peripheral region, then detection accuracy is improved, but false detection and erroneous information increase
Solution Approach 1:
The system creates a localized detection zone specifically around the wireless charging mount with a predetermined radius. Within this local region, FOB key detection is activated to prevent signal interference. Outside this region, normal FOB key detection continues without restriction. This spatial differentiation allows accurate detection where needed while avoiding false detections in other areas.
3Productivity
If wireless charging operates continuously without position checking, then productivity is maintained, but energy waste and potential interference increase
Solution Approach 1:
The system periodically checks for the presence of FOB keys in the wireless charging peripheral region during charging operations. Instead of continuous monitoring, it performs detection at regular intervals or at critical transition points. This periodic approach maintains charging productivity while reducing unnecessary energy consumption associated with constant position verification.
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
This approach effectively prevents interference by allowing the wireless charging system to accurately determine the FOB key's position and control charging operations, enhancing energy transfer efficiency and user safety by ensuring the FOB key is correctly identified and charging is only initiated when it is safely positioned.
Implementation Method 1
transmitting a first signal to inform a peripheral region of a wireless charging mount in which a wireless charging target is mounted that wireless charging is being performed
Implementation Method 2
thereof transmitting a signal to a controller when the wireless charging starts; transmitting a second signal corresponding to the first signal to the controller when the FOB key receives the first signal
Data Source
AI summary
A method for controlling wireless charging depending on a position of an FOB key in a wireless charging system provided in a vehicle and including an output unit, a wireless charging mount, and a controller, includes: transmitting, by the controller, a first signal informing a peripheral region of the wireless charging mount in which a wireless charging target is mounted that wireless charging is being performed in the peripheral region of the wireless charging mount in the case in which the wireless charging starts; transmitting, by the FOB key receiving the first signal, a second signal corresponding to the first signal to the controller; stopping, by the controller receiving the second signal, the wireless charging; and informing, by the controller, a user of the vehicle that the FOB key is present in the peripheral region of the wireless charging mount through the output unit.