Rotational Angle Sensor for Door Position and Speed Detection
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Solution Overview
Problem
Current door opening systems can only detect whether a door is open or closed, limiting their application, and there is a need for more precise information regarding the door's open angle and angular speed/acceleration.
Innovation Solution
A rotational angle sensor system comprising a movable structure, a magnet, and an angle sensor that detects the magnetic field pattern to determine the rotational position, speed, and acceleration of the door, allowing for precise detection of the door's angle and movement characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a contact switch is used to detect door open/closed state, then the system is simple and reliable, but the information provided is limited to binary results only
Solution Approach 1:
The patent replaces the mechanical contact switch system with a magnetic field-based angle sensor system. The angle sensor detects the magnetic field pattern generated by a magnet attached to the movable structure, converting mechanical rotation into electrical signals that provide continuous angular position information rather than binary contact states.
Solution Approach 2:
The patent changes the detection parameter from binary contact presence/absence to continuous magnetic field orientation angles. The angle sensor measures the magnetic field pattern at different angular positions, transforming the detection parameter from discrete (open/closed) to continuous (angular position), thereby providing much richer information about the movable structure's position.
2Measurement precision
If a contact switch is used, then the device complexity is low, but the measurement precision of door position is insufficient
Solution Approach 1:
The patent replaces the mechanical contact switch system with a magnetic field-based angle sensor system. The angle sensor detects the magnetic field pattern generated by a magnet attached to the movable structure, converting mechanical rotation into electrical signals that provide continuous angular position information rather than binary contact states.
Solution Approach 2:
The patent changes the detection parameter from binary contact presence/absence to continuous magnetic field orientation angles. The angle sensor measures the magnetic field pattern at different angular positions, transforming the detection parameter from discrete (open/closed) to continuous (angular position), thereby providing much richer information about the movable structure's position.
3Loss of information
If an angle sensor system with magnet and magnetic field detection is implemented, then the measurement precision and information detail are improved, but the device complexity increases
Solution Approach 1:
The angle sensor system performs multiple functions: it detects angular position, calculates angular speed, and determines angular acceleration. This multi-functionality compensates for the increased device complexity by providing comprehensive motion information from a single integrated sensor system rather than requiring multiple separate sensors.
Solution Approach 2:
The patent replaces the mechanical contact switch system with a magnetic field-based angle sensor system. The angle sensor detects the magnetic field pattern generated by a magnet attached to the movable structure, converting mechanical rotation into electrical signals that provide continuous angular position information rather than binary contact states.
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
Enables accurate determination of the door's open angle and calculates angular speed and acceleration, providing detailed position information beyond simple open/closed states, enhancing the functionality of door opening systems.
Implementation Method 1
The angle sensor may be configured to detect the magnetic field pattern and generate at least one signal based on the magnetic field orientation such that the at least one signal represents a rotational position of the movable structure
Data Source
AI summary
Rotational angle sensor systems and methods are provided for detecting an angular position of a movable structure. The movable structure may be configured to rotate about an axis of rotation between a first rotational position and a second rotational position. A magnet may have a magnetic field pattern with a magnetic field orientation and an angle sensor may be configured to detect the magnetic field pattern and generate one or more signals, based on the magnetic field orientation, corresponding to a rotational position of the movable structure. Additionally, a first one of the magnet and the angle sensor is configured to rotate about the axis of rotation relative to a second one of the magnet and the angle sensor that is rotationally fixed such that the magnetic field orientation changes relative to the angle sensor as the movable structure rotates about the axis of rotation.