Safety Power Window Jamming Detection Using Virtual Pulse Signals
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Solution Overview
Problem
Existing safety power window systems fail to detect jamming of objects between the window and door frame when the window motor does not rotate once or more, as they rely on multiple rotations to calculate force using hall sensors.
Innovation Solution
A safety power window system utilizing two hall sensors positioned 90 degrees apart generates virtual pulse signals to calculate force acting on the window, allowing detection of jamming even when the window motor rotates only 0.75 turns by a controller that determines if the calculated force exceeds a threshold value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single hall sensor is used to calculate force acting on the window, then the device complexity is reduced, but the measurement precision deteriorates because force cannot be calculated when the window motor rotates less than once
Solution Approach 1:
The patent divides the detection function into two separate hall sensors positioned at different angular positions (0 degrees and 90 degrees) around the motor rotor. This segmentation allows each sensor to independently detect pulse signals at different rotation phases, enabling force calculation even when the motor rotates less than one complete turn, thus resolving the contradiction between device simplicity and measurement precision.
2Measurement precision
If two hall sensors positioned 90 degrees apart are used, then the measurement precision of force calculation is improved, but the device complexity increases
Solution Approach 1:
The patent introduces virtual pulse signals as an intermediary element. The controller generates these virtual pulses based on the actual pulse signals from the two hall sensors, creating a complete set of detection data even when the motor rotation is insufficient. This intermediary approach enables accurate force calculation without requiring additional physical sensors, thus improving measurement precision while limiting the increase in device complexity to only the controller's processing functions.
3Reliability
If the window motor rotates at least once for force calculation, then the reliability of jamming detection is improved, but the loss of time increases when the motor cannot complete full rotation
Solution Approach 1:
The patent performs preliminary action by pre-positioning two hall sensors at specific angular intervals (0 and 90 degrees) around the motor rotor. This preliminary arrangement ensures that pulse signals from both sensors can be captured within a fraction of a rotation (0.75 turns), allowing force calculation to begin earlier and complete faster, thus improving both reliability and reducing time loss compared to requiring a full rotation.
Solution Approach 2:
The patent applies partial action by requiring only 0.75 turns of motor rotation instead of a complete turn for force calculation. The two hall sensors positioned 90 degrees apart enable sufficient data collection within this partial rotation, allowing jamming detection to proceed with less rotational movement, thereby reducing the time loss while maintaining detection reliability.
4Measurement precision
If force calculation requires multiple rotations, then the measurement precision is improved, but the productivity of the window operation deteriorates
Solution Approach 1:
The patent implements partial action by enabling force calculation with only 0.75 turns of motor rotation through the use of two strategically positioned hall sensors. This partial rotation approach provides sufficient data for accurate force calculation without requiring multiple complete rotations, thus maintaining measurement precision while significantly improving window operation productivity by reducing the time needed for safety detection.
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 effective detection and prevention of jamming between the window and door frame by calculating force accurately even in extreme situations where the window motor rotates minimally, thereby preventing injuries.
Implementation Method 1
a first hall sensor positioned at a rotation start point of a window motor and configured to generate a first pulse signal depending on rotation of the window motor; a second hall sensor positioned to be spaced apart from the first hall sensor by an interval of 90 degrees and configured to generate a second pulse signal depending on the rotation of the window motor
Data Source
AI summary
The present disclosure relates to a safety power window system capable of detecting jamming of an object between a window and a door frame by generating virtual pulse signals on the basis of pulse signals generated by two hall sensors positioned to have an interval of 90 degrees therebetween to calculate force acting on the window even though a window motor rotates only 0.75 turns, and an operation method thereof.