Material Web Position Detection Using Dual-Sensor Velocity Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for position detection of a material web moving in a movement direction, using markings, are unreliable due to incomplete marking presence and external influences like lighting, leading to stability issues in control loops.
Innovation Solution
A dual-sensor system is employed, where one sensor detects the marking for position signals and another sensor detects the velocity component transverse to the movement direction, with the latter's signal used to correct and maintain output signals even when position signals fail, ensuring continuous regulation processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sensor is used to detect the marking for position detection, then the device complexity is low, but the reliability of position detection deteriorates due to incomplete marking presence and external influences
Solution Approach 1:
The patent combines the functionality of a position detection sensor and a velocity detection sensor into a single integrated sensor system. The sensor simultaneously captures both position information (marking detection) and velocity information (transverse movement detection), eliminating the need for separate sensors while improving reliability through multiple detection capabilities.
Solution Approach 2:
The sensor system is designed to perform multiple functions: detecting the position of markings on the material web and detecting transverse velocity components. This multi-functional approach allows a single sensor to provide both position signals and velocity signals, reducing device complexity while enhancing detection reliability.
2Stability of the object's composition
If only position signals are used for control, then the control system is simple, but the stability of the control loop deteriorates when position signals are unavailable
Solution Approach 1:
The system implements feedback control by continuously monitoring both position and velocity signals. When position signals become unavailable or unreliable, the feedback mechanism automatically switches to using velocity signals to maintain control loop stability. The velocity feedback provides continuous information about material web movement, ensuring the regulator can continue operating without interruption.
Solution Approach 2:
The system performs preliminary detection of both position and velocity information simultaneously. By having velocity information readily available before position signal failure occurs, the system can seamlessly transition to velocity-based control without interruption, maintaining stability throughout the control process.
3Measurement precision
If the marking is used as the sole detection target, then the measurement process is simple, but the measurement precision deteriorates due to external influences like lighting and incomplete marking presence
Solution Approach 1:
The velocity signal acts as an intermediary that complements the position signal. When external influences affect marking detection and position signal quality deteriorates, the velocity signal serves as an alternative reference that is less susceptible to these external factors, thereby maintaining measurement precision through signal combination or substitution.
Data Source
AI summary
In a method and a device for position detection of a material web (2), the position of the material web (2) is determined on the basis of a marking (13) provided thereon. This marking (13) is detected by a first sensor (4), which emits a position signal (33) proportional to the position of the marking (13). The material web (2) is furthermore detected by a second sensor (5), which emits a signal proportional to the velocity of the material web (2) transversely to the movement direction (8). An output signal (7), which represents position-proportional values of the material web (2) even when the position signal (33) fails, is then calculated from the velocity signal (54) and the position signal (33).