Optical Parking Assist with Angle-Based Distance Detection
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Solution Overview
Problem
Conventional parking assistance systems using wave reflection face issues with variable reception areas based on object shape and orientation, leading to inaccurate detection and false positives due to reflections from non-target objects.
Innovation Solution
A parking assistance system employing a light source at the parking position with position-sensitive detectors on the vehicle to calculate incident angles and distances, reducing light volume as the vehicle approaches to prevent saturation and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional wave reflection systems are used for parking assistance, then the system can detect distance, but the reception area changes depending on object shape and orientation causing false detection
Solution Approach 1:
The patent replaces the conventional acoustic wave reflection system with an optical system using light sources and position-sensitive detectors. This substitution eliminates the problems of variable reception areas and false reflections because light travels in straight lines and the detection is based on direct optical paths rather than reflected waves, thereby improving both measurement precision and reliability
Solution Approach 2:
The patent introduces angular measurement as an additional dimension by calculating incident angles of light on position-sensitive detectors. This angular information, combined with distance measurements, creates a more robust detection system that can accurately identify target objects and eliminate false detections by verifying both position and orientation
2Area of stationary object
If light volume is increased to improve detection range, then detection capability is enhanced, but saturation occurs when vehicle approaches causing inaccurate detection
Solution Approach 1:
The patent implements dynamic light volume control where the light source adjusts its emission intensity based on the detected distance between the vehicle and parking position. When the vehicle is far away, higher light volume is used to ensure detection; when the vehicle approaches, the light volume is reduced to prevent saturation of the position-sensitive detectors, thereby maintaining measurement precision across all detection ranges
Solution Approach 2:
The system uses feedback from the position-sensitive detectors to continuously monitor light intensity levels and adjust the light source output accordingly. This feedback mechanism ensures that the light volume is optimized for each detection scenario, preventing both under-detection at long ranges and saturation at close ranges
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 system accurately detects the vehicle's position relative to the parking space, preventing false detections and ensuring stable positioning, even with varying object shapes and orientations, by using a light source with adjustable light volume and position-sensitive detectors for precise angle and distance calculations.
Implementation Method 1
receive light emitted from a light source provided at a parking position by using a plurality of position sensitive detectors; calculate the incident angle of the light on each of the plurality of position sensitive detectors
Data Source
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AI summary
Provided is a parking assistance system capable of accurately detecting the position of a vehicle relative to a parking position in the parking of the vehicle at the parking position. The parking assistance system includes: a light source 11 provided at a parking position at which a power transmission coil 3 is provided, and configured to emit light; at least two light reception units 21, 22 mounted away from each other on a vehicle 1 including a power reception coil, and each configured to receive the light emitted from the light source 11 by using a position sensitive detector 32, 34; an incident-angle calculation unit 23 configured to calculate the incident angle of the light on each of the light reception units 21, 22; a distance calculation unit 24 configured to calculate the distance between the parking position and the vehicle 1 from the incident angles of the light on the light reception units 21, 22; and a detection unit 15 configured to detect that the vehicle 1 has approached the parking position. The light volume of the light source 11 is reduced when the detection unit 15 detects that the vehicle 1 has approached the parking position.