Non-contact Power Transmission Coil Alignment via Vehicle State Adaptation
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Solution Overview
Problem
Existing non-contact power transmission systems for electric vehicles face challenges in accurately aligning primary and secondary coils due to varying vehicle states such as speed, height, and inclination, leading to inefficiencies in power transmission.
Innovation Solution
A non-contact power transmission system that includes a primary side control unit for transmitting weak power, a voltage detector, a storage device for voltage value-horizontal distance characteristics, sensors for detecting vehicle states, and a characteristic setting unit to adjust these characteristics based on vehicle state data, enabling precise alignment of the primary and secondary coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If proximity sensors are provided on the charging station side for alignment, then alignment capability is achieved, but installation costs increase
Solution Approach 1:
Instead of placing sensors on the charging station side (primary coil side), the patent places sensors on the electric vehicle side (secondary coil side) to detect the magnetic field. This inversion transfers the alignment detection function from the stationary charging infrastructure to the moving vehicle, significantly reducing installation costs at charging stations while maintaining alignment capability.
2Device complexity
If power transmission efficiency is detected without considering vehicle state variations, then detection simplicity is maintained, but alignment accuracy deteriorates
Solution Approach 1:
The patent introduces dynamic adjustment of the magnetic field detection threshold based on vehicle state parameters (speed, acceleration, inclination). The threshold is not fixed but adapts to changing vehicle conditions, allowing accurate alignment detection across various driving scenarios while maintaining a relatively simple detection system.
Solution Approach 2:
The system changes the detection parameter (threshold value) according to vehicle state. By adjusting the threshold based on speed, acceleration, and inclination data, the system maintains high alignment accuracy without requiring completely different detection methods for each vehicle state.
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 achieves accurate alignment of primary and secondary coils regardless of vehicle state variations, enhancing power transmission efficiency and reducing installation costs by adapting to different vehicle conditions.
Implementation Method 1
a non-contact power transmission system that transmits electric power between a primary coil and a secondary coil
Implementation Method 2
detecting a low power excitation (LPE) voltage that is generated between both ends of a resistor when the weak power is received
Data Source
AI summary
A storage device stores a voltage value-horizontal distance characteristic that represents a relation between a horizontal distance between a primary coil and a secondary coil, and a voltage value. A characteristic setting unit sets a voltage value-horizontal distance characteristic that matches a vehicle state, on the basis of a value for the vehicle state (vehicle speed v, vehicle height h, and inclination i) detected by sensors and the voltage value-horizontal distance characteristic stored in the storage device. A horizontal distance estimation unit estimates the horizontal distance on the basis of the voltage value-horizontal distance characteristic and the voltage value.