Vehicle Field Neutralization During Inductive Charging
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Solution Overview
Problem
Inductive charging of vehicles generates electromagnetic fields that interfere with vehicle functions and neighboring systems, causing interference and impairing functions such as keyless access.
Innovation Solution
A control unit determines the properties of the electromagnetic interference field and emits an opposing field to neutralize or reduce its strength, using existing transmitting units to achieve destructive interference and ensure uninterrupted vehicle functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inductive charging is performed using primary and secondary coils, then wireless energy transfer to the vehicle battery is achieved, but electromagnetic interference fields are generated that impair vehicle functions
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the electromagnetic interference field generated during inductive charging as the very field to be canceled. The control unit generates a canceling electromagnetic field that destructively interferes with the original interference field, thereby neutralizing its harmful effects on vehicle functions while maintaining the wireless charging process
2Productivity
If the electromagnetic field strength is increased to improve charging efficiency, then faster energy transfer is achieved, but interference with vehicle functions and neighboring systems increases
Solution Approach 1:
The patent introduces a canceling electromagnetic field as an intermediary that mediates between the primary coil's charging field and the vehicle's sensitive electronic systems. This intermediary field destructively interferes with the harmful components of the electromagnetic radiation, allowing high-power charging to proceed without proportionally increasing interference with vehicle functions
3Device complexity
If existing transmitting units are used for both keyless access and field cancellation, then device complexity is reduced, but the transmitting units must perform multiple functions simultaneously
Solution Approach 1:
The patent applies the principle of universality by enabling existing transmitting units in the vehicle to perform multiple functions: their original keyless access function and the additional function of generating canceling electromagnetic fields during inductive charging. The control unit manages this multi-functionality by activating the canceling field generation only when needed during charging operations
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 effectively reduces electromagnetic radiation and interference, allowing vehicle functions like keyless access to operate without disruption, utilizing existing vehicle components for cost-effective neutralization.
Implementation Method 1
The primary coil 111 is connected to a power supply 110. The power supply 110 can be a radiofrequency generator which generates an AC (alternating current) current in the primary coil 111, whereby a magnetic field is induced.
Implementation Method 2
Given sufficient magnetic coupling between primary coil 111 and secondary coil 102 via the underbody clearance 120, the magnetic field induces a corresponding voltage and thus also a current in the secondary coil 102.
Implementation Method 3
The control unit is further designed to cause one or more transmitting units of the vehicle to emit an opposing field which reduces a field strength of the interference field in a first region around and/or in the vehicle.
Data Source
AI summary
A device and a corresponding method are provided for reducing an electromagnetic field in a vehicle. A control unit for a vehicle is designed to determine one or more properties of an electromagnetic interference field. The control unit is further designed to incite an emission unit in the vehicle to emit an opposing field which reduces a strength of the interference field in a first zone around and/or in the vehicle.