Belt Drive Health Monitoring via Sliding Teeth Detection
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Solution Overview
Problem
Conventional electric power steering systems lack an effective method to evaluate the health status of the belt drive, leading to potential belt breakage and safety risks due to undetected sliding teeth, which can reduce auxiliary power and cause driving hazards.
Innovation Solution
A method that involves using sensors to measure the rotation of the steering column and motor rotor, interpreting this data with an electronic control unit to detect sliding teeth by comparing it against stored rotation relationships, and generating alerts based on predetermined threshold values to assess the health status of the belt drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no health evaluation method is implemented, then the system structure remains simple, but the reliability of the belt drive deteriorates due to undetected sliding teeth
Solution Approach 1:
The patent implements preliminary detection of sliding teeth by monitoring the rotational relationship between drive wheel and driven wheel before belt breakage occurs. The ECU continuously compares actual rotation ratios with standard values to detect abnormal sliding teeth conditions early, allowing preventive maintenance before catastrophic failure.
Solution Approach 2:
The system establishes a feedback mechanism where the ECU continuously monitors the rotational angles of both wheels, compares the actual rotation ratio against predetermined standard ratios, and generates warning signals when deviations indicate sliding teeth. This closed-loop feedback enables real-time health evaluation of the belt drive system.
2Reliability
If sliding teeth detection is implemented, then the safety improves, but the measurement precision requirement increases
Solution Approach 1:
The patent uses the rotational angle sensors as intermediary measurement devices that indirectly detect sliding teeth conditions through the rotational relationship between wheels. Instead of directly measuring belt tension or wear, the system uses rotation ratio deviations as an intermediary indicator of sliding teeth, simplifying the measurement requirements while maintaining detection accuracy.
3Measurement precision
If continuous monitoring is performed, then the detection capability improves, but the energy consumption increases
Solution Approach 1:
The system leverages the existing rotational sensors and control unit that are already part of the electric power steering system. The same sensors used for normal steering control are repurposed for belt health monitoring, eliminating the need for additional dedicated monitoring components and minimizing extra energy consumption.
Data Source
AI summary
A method of evaluating the health status of belt drive in electric power steering system by detecting the occurrence of sliding teeth in the electric power steering system and the frequency of occurrence and the output of the motor. In this way, the user really knows the belt drive health of the electric power steering system.