Non-Contact Power Transmission Position Detection
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Solution Overview
Problem
In non-contact power transmission systems, the unique shapes of the power transmitting and receiving coils lead to positions with the same weak voltage value despite different distances, making it difficult to uniquely detect the position of the power receiving coil with respect to the power transmitting coil, resulting in discomfort for vehicle occupants and suboptimal charging efficiency.
Innovation Solution
A control unit in the vehicle with a voltage value detection unit, position differentiation unit, and movement displacement amount detection unit is used to calculate the position differential value of the weak voltage, allowing for accurate positioning by setting the initial position based on the position where the position differential value exceeds zero, and optimizing charging efficiency by referencing predetermined voltage values and vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the power receiving coil moves linearly toward the power transmitting coil, then the weak voltage value increases from zero initially, but the weak voltage decreases monotonically after reaching an initial maximum value due to the unique characteristics of the coil shapes
Solution Approach 1:
The patent introduces a new dimension to position detection by not only measuring the weak voltage value but also calculating its position differential value (rate of change with respect to position). This additional dimensional information allows the system to distinguish between different positions that may have the same voltage value, thereby resolving the ambiguity in position detection caused by the non-monotonic voltage characteristics.
Solution Approach 2:
The system continuously monitors the weak voltage value and its position differential value, using this feedback to determine the current position state. By comparing the differential value against threshold conditions, the system can identify specific position states (such as when the differential value exceeds zero) and adjust positioning accordingly, creating a closed-loop control system that overcomes the limitations of voltage-only measurement.
2Ease of operation
If the same weak voltage value is exhibited at different distances, then it becomes impossible to uniquely detect the position of the power receiving coil, but this results in discomfort for vehicle occupants and suboptimal charging efficiency
Solution Approach 1:
The patent resolves the position ambiguity by adding the position differential value as an additional measurement dimension. Instead of relying solely on the absolute voltage value (which can be identical at different positions), the system uses the rate of change of voltage with respect to position to uniquely identify the current position state, enabling accurate position detection even when voltage values repeat.
Solution Approach 2:
The system changes the detection parameter from static voltage value alone to a combination of voltage value and its differential (rate of change). This parameter transformation allows the system to differentiate between positions that have identical voltage readings, as the differential values will differ at each position, thereby restoring unique position detectability.
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 method enables reliable positioning of the power receiving coil with respect to the power transmitting coil, optimizing charging efficiency and enhancing the user experience by accurately determining the vehicle's position, even in scenarios where the same weak voltage value is exhibited at different distances.
Implementation Method 1
the weak power is generated from a power transmitting coil disposed in the charging station, and the weak power generated from the power transmitting coil is detected by a power receiving coil
Data Source
AI summary
Provided s a non-contact power transmission system with which it is possible to individually detect the position of a receiving unit with respect to a transmission unit, even if there are positions at which the same microvoltage values are indicated, even if the distance differs, due to the shape of the transmission coil of the transmission unit and the receiving coil of the receiving unit. At a position at which the position differential value of the detected microvoltage exceeds a zero value, said positions set to the initial position (+xint) of the movement displacement of the vehicle, and the movement displacement on the basis of vehicle velocity is calculated to a position (+xc) at which the microvoltage value characteristics can be used from said initial position to (+xc to 0).