Belt Drive Monitoring via Marking Correlation for Skipped-Tooth Detection
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Solution Overview
Problem
Current condition monitoring of belt drives, especially in encapsulated steering gear systems, is limited by the need for visual inspection and mechanical tests, which is impractical and ineffective for detecting issues like skipped teeth, and requires precise positioning of the belt and pulleys, making it difficult to implement in vehicles with autonomous driving functions.
Innovation Solution
A method using sensor elements and a computing unit to detect markings on the belt and rotor, allowing for self-learning correlation of signals to determine belt condition without complex positioning, enabling early detection of skipped teeth and other damage through self-learning algorithms and reference values, even in encapsulated systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual inspection and mechanical tests are used for belt drive monitoring, then condition monitoring is possible, but it requires disassembly and is impractical for encapsulated systems
Solution Approach 1:
The patent replaces mechanical inspection methods (visual inspection and mechanical tests) with an optical sensing system. Markings on the belt are detected by optical sensors that read changes in light properties (reflection, absorption, or transmission) as the belt rotates, enabling non-contact condition monitoring without requiring system disassembly.
Solution Approach 2:
The patent introduces markings as intermediary elements on the belt that serve as detectable indicators of belt condition. These markings act as mediators between the belt's physical state and the sensor's measurement capability, allowing the sensor to indirectly assess belt wear and damage through optical property changes.
2Measurement precision
If precise positioning of belt and pulleys is required for marking detection, then measurement accuracy is improved, but device complexity and alignment difficulty increase
Solution Approach 1:
The patent employs dynamic signal processing to compensate for positioning variations. Instead of requiring static precise alignment, the system captures signals during belt rotation and uses evaluation algorithms to extract accurate condition information despite variations in marking position, sensor alignment, or belt tension.
Solution Approach 2:
The system uses feedback from the detected marking signals to continuously assess belt condition. The evaluation of signal characteristics (amplitude, frequency, timing) provides real-time information about belt wear, and this feedback loop enables ongoing monitoring without requiring repositioning or recalibration.
3Duration of action of stationary object
If encapsulated belt drives are designed for extended service life, then component size increases, but weight and energy consumption increase
Solution Approach 1:
The patent implements preliminary monitoring capability that detects early signs of belt degradation before failure occurs. By identifying wear trends and anomalies in advance, the system enables predictive maintenance scheduling that optimizes replacement timing, allowing for lighter component design since extreme oversizing for maximum service life is no longer required.
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 simple and precise condition monitoring of belt drives without visual inspection or mechanical tests, allowing for early detection of impending failures and continuous monitoring, ensuring safety in autonomous vehicles by determining changes in belt wear and position without requiring precise initial alignment.
Implementation Method 1
A marking is respectively applied to the belt and to the belt pulley. A signal is triggered when the markings on the belt and the drive pulley are opposite one another. The markings for identifying the position can be based on various sensor technologies, for example based on optical, inductive, capacitive or magnetic effects.
Implementation Method 2
The rotor, that is to say the rotating part of the drive motor, has at least one second marking and a second sensor element which is provided with corresponding electronic devices and is assigned to the drive motor. While the rotor is rotating, the passage, i.e. the 'passing ', of the second marking is detected by the second sensor element
Data Source
AI summary
A method for monitoring a drive belt is disclosed. A drive pulley driving by a drive motor and having a drive belt is provided. First and second markings are provided on the belt. The markings are detected. A correlation is determined and a signal is generated if a reference value is exceeded.