EV Charging Station Loop Detection for Weatherproof Occupancy Sensing
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Solution Overview
Problem
Existing electric vehicle charging systems fail to reliably detect vehicle presence, particularly in bad weather conditions, leading to inaccurate availability reports and potential safety hazards from electromagnetic fields.
Innovation Solution
Incorporating an inductive loop detector with a decoupled loop structure, such as an 8-shape, for vehicle presence detection, which can be integrated with foreign object detection (FOD) electronics to provide reliable presence sensing, especially for wireless charging systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If camera systems are used for vehicle presence detection, then detection capability is provided, but reliability deteriorates in bad weather conditions
Solution Approach 1:
The patent replaces optical detection systems (cameras) with electromagnetic induction-based detection (inductive loop detectors). This substitution uses electromagnetic fields instead of optical fields, making the detection system immune to weather conditions like rain, fog, or snow that adversely affect camera-based systems. The inductive loop detector generates an electromagnetic field that interacts with the vehicle's metal body, providing reliable detection regardless of weather.
2Measurement precision
If only charging process status is used for occupancy detection, then system complexity is reduced, but detection accuracy deteriorates by missing parked vehicles
Solution Approach 1:
The inductive loop detector continuously monitors the parking space for vehicle presence independently, without requiring additional complex detection systems. The system uses the vehicle's own metal body as part of the detection mechanism - when a vehicle is present, it alters the electromagnetic field of the inductive loop, providing automatic and continuous detection of both charging and non-charging vehicles.
3Reliability
If inductive loop detector is placed in ground assembly for wireless charging, then vehicle presence detection is improved, but electromagnetic field exposure risk increases
Solution Approach 1:
The patent uses a decoupled loop structure where the inductive loop detector is divided into separate sections (e.g., first and second loops) that are spatially distributed. This allows the detection function to be localized to specific areas while limiting the overall electromagnetic field footprint. The decoupled structure reduces the total electromagnetic energy required compared to a single large loop, thereby reducing exposure risk while maintaining detection capability.
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
Ensures accurate vehicle presence detection, even in adverse weather, reducing false availability reports and minimizing exposure to hazardous electromagnetic fields.
Implementation Method 1
an inductive loop detector, which is equipped and configured for detecting the presence of a vehicle
Implementation Method 2
the decoupled loop structure can be 8-shaped. To avoid high induced voltages from the power field, a decoupled loop structure like an 8-shape can be used.
Data Source
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AI summary
The invention relates to a charging station (100) for electric vehicles (400), comprising - an electric energy source (150), which is equipped and configured for charging an electric vehicle (400), - a parking space (110) for a vehicle (110), and - a vehicle presence detection device (20), which is equipped and configured for detecting the presence of a vehicle (400) in the parking space (110), regardless of whether the vehicle (400) is an electric vehicle (400) being charged, an electric vehicle (400) having been charged or any other vehicle (400) being parked in the parking space (110), and regardless of weather conditions.