Wireless Power Transfer System Dynamic Sensing Region Adjustment
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in setting a suitable sensing region for wireless charging, leading to adverse effects such as reduced charging efficiency and increased leakage electromagnetic field influence on nearby devices, particularly when vehicles are charging in parking spaces or traveling on highways.
Innovation Solution
A wireless power transfer system with a first power transmission unit in a parking space and a second power transmission unit in a traveling lane, featuring a sensing unit and controller that adjusts the sensing region and power transmission based on the vehicle's location, reducing power transmission when a sensing target is detected to minimize electromagnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide sensing region is set when the vehicle performs charging while traveling on the charging lane, then other vehicles traveling near this vehicle are sensed, but the electric power to be transmitted is reduced, resulting in charging cannot be satisfactorily performed
Solution Approach 1:
The patent applies local quality by setting different sensing region sizes based on the charging location. When charging in a parking space, a first (larger) sensing region is set to detect persons nearby. When charging on a traveling lane, a second (smaller) sensing region is set to avoid detecting other vehicles and maintain charging efficiency. This location-based differentiation resolves the contradiction between safety and charging efficiency.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the sensing region size according to the vehicle's charging location. The controller switches between the first sensing region (for parking spaces) and the second sensing region (for traveling lanes) based on real-time location information. This dynamic adjustment allows the system to optimize both safety and charging efficiency for different operating conditions.
2Object-affected harmful factors
If the power feeding unit feeds electric power to the power reception unit, then wireless charging is performed, but when a living body is sensed, the electric power to be fed is limited, reducing charging efficiency
Solution Approach 1:
The patent applies local quality by differentiating the power limitation strategy based on charging location. In parking spaces, power is limited when persons are detected to protect against electromagnetic field exposure. On traveling lanes, power limitation is relaxed or avoided since other vehicles (not vulnerable living bodies) are detected, thus maintaining charging efficiency while still addressing safety concerns appropriately for each context.
Solution Approach 2:
The patent implements parameter changes by adjusting the power transmission parameters based on the detected target type and charging location. When a person is detected in a parking space, the power transmission parameter is reduced to limit electromagnetic exposure. When another vehicle is detected on a traveling lane, the power parameter is maintained to ensure efficient charging. This parameter adaptation resolves the contradiction between safety and efficiency.
3Object-affected harmful factors
If the sensing region is set to detect persons in parking spaces, then electromagnetic field influence on electric devices is reduced, but the system complexity increases due to location-based sensing region management
Solution Approach 1:
The patent applies segmentation by dividing the sensing region into two distinct types: a first sensing region for parking spaces and a second sensing region for traveling lanes. Each sensing region is optimized for its specific context. This segmentation simplifies the management complexity by providing clear, predefined regions rather than requiring continuous complex calculations, while still achieving the goal of reducing electromagnetic field influence on electric devices.
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 effectively reduces the intensity of the leakage electromagnetic field when a sensing target is present, enhancing charging efficiency and safety by dynamically adjusting power transmission in response to the vehicle's location and proximity of objects.
Implementation Method 1
a power transmission unit provided in a parking space or in a traveling lane for a vehicle and having a function of wirelessly transmitting electric power to a power reception unit provided in a vehicle
Implementation Method 2
a sensing unit having a function of sensing a sensing target in a sensing region set around the vehicle when the power reception unit receives electric power from the power transmission unit
Data Source
AI summary
A wireless power transfer system includes a first power transmission unit, a second power transmission unit, a power reception unit, a sensing unit, and an ECU. The first power transmission unit is provided in a parking space. The second power transmission unit is provided in a traveling lane for a vehicle. The sensing unit senses a sensing target in a sensing region set around the vehicle. When the sensing unit senses the sensing target, the ECU reduces electric power transmitted from the first power transmission unit or the second power transmission unit that is transmitting electric power to the vehicle. The ECU sets the sensing region to be larger when the power reception unit receives electric power from the first power transmission unit than when the power reception unit receives electric power from the second power transmission unit.