Screening Drive Assembly with Single-Sensor Position Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drive arrangements for darkening devices, such as roller shutters, face challenges in achieving high operational reliability, particularly after power failure or motor shutdown, due to inaccuracies in position determination and increased assembly and cabling costs from requiring multiple sensors.
Innovation Solution
The proposed drive arrangement uses an incremental sensor with time interval measurement to determine the position of the closure element, storing current counter readings and sensor signals in a buffer for accurate position estimation and direction detection, allowing for high accuracy and reliability with a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two separate sensors are used to determine position accurately, then measurement precision is improved, but device complexity and assembly cost increase
Solution Approach 1:
The patent combines the functions of two separate sensors into a single sensor device that simultaneously detects both rough position and fine position. The single sensor device includes a first sensor element for rough position detection and a second sensor element for fine position detection, eliminating the need for separate sensor arrangements and reducing assembly complexity while maintaining high measurement precision.
Solution Approach 2:
The single sensor device performs multiple functions: it detects both the rough position (via first sensor element) and fine position (via second sensor element) of the closure element. This multi-functional approach replaces the need for two separate dedicated sensors, reducing device complexity while achieving accurate position determination across different measurement ranges.
2Device complexity
If incremental sensors with counting are used to track position, then device complexity is reduced, but measurement precision deteriorates due to cumulative errors
Solution Approach 1:
The patent segments the measurement range into two parts: rough position detection using the first sensor element and fine position detection using the second sensor element. By dividing the measurement function and using different sensor elements for different measurement ranges, the system avoids cumulative errors in incremental counting while maintaining simple device structure.
Solution Approach 2:
The patent replaces pure incremental counting (mechanical accumulation of position steps) with a hybrid approach that uses magnetic field detection from multiple sensor elements. This substitution eliminates cumulative counting errors by directly measuring position through magnetic field interactions, maintaining simplicity while improving precision.
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 solution enhances the accuracy and reliability of position determination, enabling precise adjustment and direction detection, while reducing assembly and cabling complexity and costs, and addressing issues of sagging or unintended adjustments after power failure.
Implementation Method 1
a sensor device (5) which generates periodic sensor signals during motorized adjustment of the closure element (1)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The arrangement has a gear for motor adjustment of a closure element (1). A drive controller has a path measuring instrument for determining rough position of the element. The instrument has a sensor that produces periodic sensor signals during motor adjustment and supplies periodic counting events to a position counter. The occurrence of a counting event in the counter causes increment or decrement in counting steps based on adjustment direction. A path measuring instrument for determining fine position has a time measuring unit for measuring actual time interval of counting event.