Contactless Charging Device Interference Management
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Solution Overview
Problem
Non-contact charging systems for electric and hybrid vehicles face interference with vehicle function systems using the same frequency range, leading to potential disruptions in systems like tire pressure monitoring and keyless entry, especially when multiple vehicles are parked nearby.
Innovation Solution
A method and device that use environmental sensors and cameras to detect approaching users or vehicles, allowing for the reduction or interruption of charging current to avoid interference, with the charging device operating independently of low-frequency interference by adjusting the charging current based on predefined data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If non-contact charging device operates at high power to provide optimal energy transmission, then charging efficiency is improved, but interference with vehicle function systems (keyless entry, tire pressure monitoring) increases
Solution Approach 1:
The system performs preliminary detection of the electromagnetic environment before initiating or maintaining high-power charging operation. The control unit continuously monitors for interference signals from keyless entry systems and tire pressure monitoring systems, and preemptively adjusts charging power levels to prevent interference before it occurs, thereby maintaining both high charging efficiency and system compatibility
Solution Approach 2:
The charging device dynamically adjusts its operating parameters based on real-time detection of vehicle function system activity. When interference is detected or anticipated, the control unit modulates the charging power level or frequency, creating a dynamic balance between maintaining optimal energy transmission and preventing harmful interference with sensitive vehicle systems
2Productivity
If charging current is continuously transmitted at high level, then productivity of charging process is improved, but disruption to keyless entry system operation increases
Solution Approach 1:
The system implements periodic monitoring of the electromagnetic environment during charging operation. The control unit cycles through detection and charging phases, temporarily reducing or pausing charging current at regular intervals to allow keyless entry system signals to pass through without interference, then resuming high-power charging when the path is clear, thereby maintaining both charging productivity and keyless entry reliability
Solution Approach 2:
The system employs feedback mechanisms where the control unit monitors signals from keyless entry systems and tire pressure monitoring systems in real-time. When interference is detected, the feedback loop triggers immediate adjustment of charging current levels, creating a self-regulating system that maintains both high charging productivity and reliable keyless entry operation through continuous monitoring and adjustment
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
Ensures interference-free operation of non-contact charging systems by reducing or interrupting the charging current when a user approaches, thereby preventing disruptions to other vehicle systems, allowing for optimal energy transmission without affecting vehicle function systems.
Implementation Method 1
The non-contact charging device is designed to provide a charging current for at least one predefined energy store of the vehicle in such a way that a current is transmitted from a stationary primary coil to a secondary coil in the vehicle as a function of a change in the magnetic field generated by the charging device
Data Source
AI summary
The contactless charging device is designed to provide a charging current for at least one specified energy store in the vehicle in such a manner that a current is transferred from a fixed location primary coil to a secondary coil in the vehicle depending on a magnetic field change generated by the charging device. During a charging phase of the at least one energy store, the invention detects, depending on specified ambient data for a specified environment around the vehicle, whether a vehicle user is approaching the vehicle and/or another vehicle which is located in a specified vicinity of the vehicle with a desire to access the vehicle or the other vehicle. If the invention detects that the vehicle user wishing to access the vehicle is approaching the vehicle and/or the other vehicle, the charging current is reduced in a specified manner.