Vehicle Electric Power Reception Device Shielding
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Solution Overview
Problem
The challenge is to efficiently mount an electric power reception device in a limited vehicle space while minimizing electromagnetic wave leakage, which is essential for non-contact charging systems in electric vehicles.
Innovation Solution
The solution involves strategically arranging vehicle-mounted components such as the side member, rear suspension, fuel tank, muffler, and brake around the electric power reception device, which includes a resonant coil, with a shielding process applied to materials with lower impedance than the components to suppress electromagnetic wave leakage, and maintaining a specific distance and shape configuration to optimize the mounting and efficiency of the electric power reception device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric power reception device is mounted in a limited vehicle space, then the mounting efficiency is improved, but electromagnetic wave leakage increases
Solution Approach 1:
A shielding member is introduced as an intermediary component between the electric power reception device and the vehicle-mounted component. This shielding member blocks electromagnetic waves generated by the reception device, preventing them from leaking to surrounding components while allowing the compact mounting arrangement to be maintained.
Solution Approach 2:
The shielding member is strategically positioned only in the region between the electric power reception device and the vehicle-mounted component, rather than providing complete surrounding shielding. This localized approach reduces the overall space occupied by shielding structures while still effectively blocking electromagnetic wave leakage in the critical direction.
2Adaptability or versatility
If the electric power reception device is arranged in the vehicle, then non-contact charging capability is achieved, but electromagnetic wave leakage to vehicle-mounted components occurs
Solution Approach 1:
The shielding member serves as a mediator that enables the electric power reception device to be integrated into the vehicle for non-contact charging functionality while simultaneously protecting other vehicle-mounted components from electromagnetic interference. The shielding member is arranged in the region between the reception device and surrounding components.
3Object-generated harmful factors
If shielding measures are implemented, then electromagnetic wave leakage is reduced, but device complexity increases
Solution Approach 1:
Instead of implementing comprehensive shielding around the entire electric power reception device, the shielding member is applied locally only in the region where electromagnetic wave leakage to vehicle-mounted components is a concern. This localized shielding approach reduces structural complexity and space requirements while maintaining effective protection.
Solution Approach 2:
The shielding function is extracted as a separate, independent shielding member that can be selectively positioned only where needed, rather than integrating shielding into the entire reception device structure. This allows for simpler overall device design with shielding added only in critical areas.
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 allows for efficient mounting of the electric power reception device in a limited space, reducing electromagnetic wave leakage and enhancing transmission efficiency while minimizing costs and vehicle size.
Implementation Method 1
an electric power receiving unit that is disposed at a bottom of the vehicle and receives electric power from the electric power transmitting unit via electromagnetic field resonance
Implementation Method 2
A shielding member is provided to electromagnetically shield the engine room from inside and outside. The shielding member is formed of a cloth, sponge, or the like having an electromagnetic shielding effect
Data Source
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Figure 5~6
AI summary
This vehicle (10) includes a vehicle-mounted component (110, 120, 130, 131, 150, 170, 180) mounted below a rear floor panel (31) and an electric power reception device (40) mounted below the rear floor panel (31) and including an electric power reception portion (27) receiving electric power in a non-contact manner from an electric power transmission device including an externally provided electric power transmission portion, and the vehicle-mounted component (110, 120, 130, 131, 150, 170, 180) is arranged flush with and around the electric power reception device (40).