Wireless Charging Position Adjustment via Height Sensor Feedback
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Solution Overview
Problem
The challenge is to improve the parking accuracy of vehicles receiving electric power from a power transmission unit in a non-contact manner, as changes in vehicle height due to passengers or luggage affect the efficiency of power transmission.
Innovation Solution
A parking assist device equipped with a vehicle control unit and a height sensor that adjusts the position between the power transmission and reception units based on the power receiving situation and vehicle height, using pre-prepared maps to estimate positional deviations and guide the vehicle to the optimal position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-contact electric power transmission is used to enable convenient charging, then ease of operation is improved, but parking accuracy deteriorates because position adjustment between power transmission and reception units becomes difficult
Solution Approach 1:
The system continuously monitors power reception status and uses this feedback to automatically adjust vehicle position. The control device receives power reception status information, determines positional deviation based on this status, and controls the vehicle to move in the appropriate direction to correct the position, creating a closed-loop control system that maintains accurate alignment without requiring manual intervention
Solution Approach 2:
The vehicle system performs self-positioning by automatically detecting power reception status and controlling its own movement to maintain optimal alignment with the power transmission unit. The vehicle uses its own power reception feedback to autonomously adjust position, eliminating the need for external positioning assistance or manual driver intervention
2Length of stationary object
If resonance-based wireless power transmission is used to transmit power over long distances, then power transmission distance is improved, but power feeding efficiency deteriorates due to position misalignment
Solution Approach 1:
The system uses power reception status as feedback to continuously monitor and adjust the vehicle's position relative to the power transmission unit. By determining positional deviation from power reception status and automatically controlling vehicle movement to correct deviations, the system maintains optimal coupling between transmission and reception units, thereby maximizing power feeding efficiency even at extended transmission distances
3Loss of energy
If manual position adjustment is required for accurate power transmission, then power feeding efficiency is improved, but ease of operation deteriorates
Solution Approach 1:
The vehicle system autonomously performs position adjustment by detecting power reception status, determining positional deviation, and controlling its own movement to maintain optimal alignment. This self-positioning capability eliminates the need for manual driver intervention while maintaining high power feeding efficiency, making the charging process as convenient as plugging in a cable
Solution Approach 2:
The control system uses real-time power reception status feedback to automatically determine positional deviation and control vehicle movement. This closed-loop control eliminates manual position adjustment requirements while maintaining optimal power transmission efficiency, providing both high efficiency and ease of operation
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 solution maintains accurate position adjustment between the power transmission and reception units, ensuring efficient power transfer even with changes in vehicle height, thereby enhancing parking accuracy and power feeding efficiency.
Implementation Method 1
Resonance is a non-contact electric power transmission technique for causing a pair of resonators (e.g., a pair of self-resonant coils) to resonate with each other in an electromagnetic field (near field) to transmit electric power through the electromagnetic field
Implementation Method 2
The height sensor is for sensing change in vehicle height of the vehicle
Data Source
AI summary
A control device controls a vehicle to perform position adjustment between a power transmission unit and a power reception unit based on a power receiving situation of the power reception unit. A height sensor is for sensing change in vehicle height of the vehicle. The control device uses relation between the power receiving situation and a distance between the power transmission unit and the power reception unit, which is predetermined according to an output from the height sensor, to perform the position adjustment between the power transmission unit and the power reception unit based on the output from the height sensor and the power receiving situation.