Wireless Charging Alignment Correction for Display and Vehicle Delays
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Solution Overview
Problem
The existing parking assistance systems for non-contact battery charging face challenges in achieving accurate alignment between the power receiving unit and the power transmitting unit due to delays in displaying alignment information and vehicle response, leading to inefficiencies in battery charging.
Innovation Solution
A parking assistance system that includes a vehicle state recognition unit and an alignment assistance unit, which corrects the displayed alignment information by accounting for display delay time and vehicle response delay time, ensuring precise alignment between the power receiving and transmitting units through real-time adjustments on an image display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If alignment assistance information is displayed on an image display device to assist vehicle positioning, then the user can obtain visual guidance for parking, but the display delay time causes the relative position information to become outdated, reducing alignment accuracy
Solution Approach 1:
The system performs preliminary correction of the relative position information based on the recognized display delay time before displaying the alignment assistance information. This advance correction compensates for the upcoming delay, ensuring that the displayed position accurately reflects the current vehicle state despite the processing time required for display.
2Measurement precision
If the system recognizes and corrects for display delay time, then the alignment accuracy is improved, but the system complexity increases due to additional delay recognition and correction units
Solution Approach 1:
The system implements a feedback mechanism where the display delay time is recognized and used to correct the relative position information. The correction amount is calculated based on the delay time and vehicle speed, creating a closed-loop system that continuously compensates for display delays, thereby maintaining high alignment accuracy.
3Ease of operation
If the user operates the vehicle based on displayed alignment information, then the user can control the vehicle positioning, but the vehicle response delay time causes the vehicle to move beyond the intended position, reducing charging efficiency
Solution Approach 1:
The system performs preliminary correction of the relative position information by adding the vehicle response delay time to the display delay time. This advance adjustment compensates for both the display delay and the subsequent vehicle response delay, ensuring that when the user acts on the displayed information, the vehicle reaches the correct position despite the combined delays.
4Measurement precision
If the system corrects relative position through display delay time only, then the display accuracy is improved, but the vehicle still moves beyond the correct position due to uncorrected vehicle response delay
Solution Approach 1:
The system implements comprehensive feedback correction that includes both display delay time and vehicle response delay time. The correction amount is dynamically calculated based on the sum of these delays and the vehicle speed, ensuring that the alignment assistance information accounts for the entire delay chain from display to actual vehicle position, thereby achieving both display and positioning precision.
Data Source
AI summary
A relative position of a power receiving unit to a power transmitting unit, represented by alignment assistance information, is corrected through a distance corresponding to a display delay time Δt1 and a vehicle response delay time Δt2. The relative position of one unit to the other at time t=t0−(Δt2+Δt1) is corrected to the relative position taken when it is assumed that a vehicle moves through a correction distance ΔP=ΔP1+ΔP2. Although a position of the power receiving unit is actually out of a chargeable area at each of the time t=t0−(Δt2+Δt1) and at time t=t0−Δt2, the alignment assistance information representing that the position of the power receiving unit is within the chargeable area is displayed on an image display device at the time t=t0−Δt2.