Vehicle Lateral Deviation Estimation for Road Power Transfer
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Solution Overview
Problem
In wireless power transfer systems, accurately detecting the lateral positional deviation of a vehicle traveling on a road is crucial for efficient power transfer, but existing methods require a large number of sensors disposed side by side, which is inefficient.
Innovation Solution
A control device estimates the lateral positional deviation of a vehicle using signals from position sensors disposed in the lane direction and vehicle speed information, without the need for sensors in the lateral direction, by calculating the change in lateral position and incorporating the coupling coefficient between the primary and secondary coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple position sensors are disposed side by side in the lateral direction to accurately detect lateral positional deviation, then measurement precision is improved, but device complexity and sensor quantity increase
Solution Approach 1:
The patent transforms the sensor arrangement from a two-dimensional lateral distribution to a one-dimensional longitudinal arrangement. By placing sensors at different positions along the traveling direction (front, center, rear) rather than side by side in the lateral direction, the system achieves lateral positional deviation detection through longitudinal positioning data combined with vehicle speed information, thereby reducing spatial complexity while maintaining measurement capability
Solution Approach 2:
The patent introduces vehicle speed information as an intermediary parameter to bridge the gap between longitudinal sensor measurements and lateral positional deviation. The control device calculates lateral position changes by integrating sensor data with speed information, allowing indirect detection of lateral deviation without requiring direct lateral sensor placement
2Measurement precision
If multiple position sensors are disposed side by side in the lateral direction to accurately detect lateral positional deviation, then measurement precision is improved, but the number of sensors increases
Solution Approach 1:
The patent reduces sensor quantity by changing the arrangement dimension from lateral to longitudinal. Instead of requiring multiple sensors across the width of the vehicle, the system uses sensors positioned along the length of the vehicle, combining their outputs with speed data to achieve lateral deviation detection with fewer total sensors
Solution Approach 2:
The patent replaces the mechanical approach of directly measuring lateral position with sensors positioned laterally, with a computational approach that derives lateral deviation from longitudinal sensor measurements and speed information. This substitution reduces hardware requirements while achieving the same measurement objective
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 configuration allows for accurate estimation of lateral positional deviation while minimizing the number of sensors required, enhancing power transfer efficiency without increasing sensor density.
Implementation Method 1
a coupling coefficient regarding a magnetic coupling between a primary coil installed in the road and a secondary coil mounted on the vehicle
Data Source
AI summary
A control device that controls a supply device that non-contactly transmits electric power to a vehicle running on a road, and is arranged in a line in the lane direction of the road and has multiple positions that detect the lateral position of the vehicle on the road. The amount of change in the lateral position of the vehicle is calculated based on the signal input from the sensor, and the amount of lateral positional deviation of the vehicle is estimated based on the calculated amount of change and vehicle speed information of the vehicle.