Wireless Vehicle Charging Suspension by Foreign Object Type
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Solution Overview
Problem
During non-contact charging of vehicle-mounted batteries, the system faces challenges in determining the appropriate suspension period for power transmission when a foreign object is detected, leading to potential overheating or incomplete charging due to premature or delayed resumption of charging.
Innovation Solution
A non-contact charging system that incorporates a power transmission unit, a foreign-object detection unit, and a charging control device to suspend and resume power transmission based on the type of foreign object detected, using a metal detector and living-body detector to set varying suspension periods and issue notifications for foreign object removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power transmission is suspended for a fixed period after foreign object detection, then safety is improved, but charging efficiency deteriorates due to excessively long suspension periods
Solution Approach 1:
The suspension period is changed from a fixed value to a dynamic value that varies according to the type of foreign object detected. The control device determines whether the foreign object is a metal object or a non-metal object and sets the suspension period accordingly, allowing the system to adapt the suspension duration to the specific hazard level of the detected object.
Solution Approach 2:
The suspension period parameter is modified based on the type of foreign object detected. The system changes the time parameter dynamically by categorizing foreign objects into different types (metal vs. non-metal) and assigning different suspension periods to each category, thereby optimizing both safety and charging efficiency.
2Productivity
If power transmission is resumed immediately after foreign object detection, then charging efficiency is improved, but safety deteriorates due to potential overheating
Solution Approach 1:
The system applies preliminary anti-action by suspending power transmission before potential overheating can occur. When a foreign object is detected, the control device proactively stops power transmission for a type-dependent suspension period, preventing the foreign object from causing overheating or other safety issues before they can manifest.
Solution Approach 2:
The control device takes preliminary action by detecting the foreign object type and determining the appropriate suspension period before resuming charging. This preliminary classification and suspension ensures that when power transmission resumes, it is safe to do so, thereby maintaining both safety and efficiency.
3Device complexity
If uniform suspension period is applied to all foreign objects, then device complexity is reduced, but measurement precision deteriorates in distinguishing foreign object types
Solution Approach 1:
The control device segments foreign objects into different categories (metal objects and non-metal objects) based on their detected properties. This segmentation allows the system to apply different suspension periods to different object types, improving measurement precision while maintaining relatively simple control logic through clear categorical distinctions.
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 effectively reduces the probability of excessively short or long suspension periods, ensuring safe and efficient charging by accurately detecting foreign objects and managing power transmission to avoid overheating and unnecessary notifications.
Implementation Method 1
a power transmission unit 10 that transmits power in a non-contact manner to a power reception unit 20
Implementation Method 2
when a person or a foreign object is detected by a change in power transmission efficiency
Data Source
AI summary
Power transmission to a power reception unit that is performed by a power transmission unit and, in turn, non-contact charging of a battery mounted on a vehicle are suspended on the condition that the existence of a foreign object is detected around the power transmission unit. A designated period that is a suspension period of power transmission performed by the power transmission unit is set to vary in accordance with the type of a foreign object, that is, in the present embodiment, depending on whether a foreign object is a metal piece or an object containing metal (first foreign object) or a living body (second foreign object).