Motor Obstacle Detection Using Voltage and Speed
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Solution Overview
Problem
Current methods for detecting obstacles during the closure of motor-driven openings, such as car windows, are not robust enough and are costly, particularly failing to differentiate between obstacles and closure seals, which can lead to damage.
Innovation Solution
A method that calculates an obstacle detection criterion using the speed of rotation of a motor shaft and a quantity representative of the motor voltage, eliminating the need for additional sensors and compensating for speed regulation variations, using the formula Tr=Ur−K*w, where Tr is the resisting torque, Ur is the motor voltage, K is the torque constant, and w is the speed of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indirect detection criteria are used to detect obstacles, then the detection capability is improved, but the robustness and cost-effectiveness deteriorate
Solution Approach 1:
The motor itself serves as the detection sensor by utilizing its own operational parameters (current, speed, voltage) to detect obstacles. The motor's electrical characteristics change when encountering resistance, allowing it to self-diagnose obstacle presence without external sensors.
Solution Approach 2:
The invention monitors changes in the motor's electrical parameters (current, speed, voltage) to detect obstacles. When an obstacle is present, these parameters change in characteristic ways that can be detected and analyzed to determine obstacle presence.
2Measurement precision
If robust detection criteria are used to differentiate obstacles from closure seals, then the detection accuracy is improved, but the system complexity and cost increase
Solution Approach 1:
The system continuously monitors the motor's operational parameters during the closing operation and uses feedback control to differentiate between normal seal contact and abnormal obstacle presence. The controller adjusts based on real-time parameter analysis to maintain accurate detection.
Solution Approach 2:
The system performs preliminary analysis of the motor parameters during normal operation to establish baseline characteristics. This preliminary understanding of normal vs. abnormal parameter patterns enables more accurate real-time differentiation between seals and obstacles.
3Manufacturing precision
If speed regulation is applied to the motor, then the control precision is improved, but the obstacle detection reliability deteriorates due to speed variations
Solution Approach 1:
The system uses feedback control to monitor actual motor speed and compensates for speed variations when analyzing obstacle detection parameters. By accounting for the actual speed at any moment, the system maintains accurate obstacle detection despite speed regulation changes.
Solution Approach 2:
The detection system dynamically adapts to changing operating conditions by continuously adjusting its analysis based on real-time speed measurements. The parameter thresholds and analysis methods are modified according to the current operational state to maintain detection accuracy.
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 approach provides a robust and cost-effective obstacle detection method that is independent of speed regulation, reducing the risk of damage by accurately differentiating obstacles from closure seals without requiring specific sensors, thus enhancing reliability and reducing design costs.
Implementation Method 1
the electromagnetic force generated by a motor makes it possible to close the opening
Data Source
AI summary
The invention relates to a method for obtaining a criterion for detecting obstacles in a closure movement of a motor-driven opening. The obtaining method includes the step of determining a speed of rotation of a motor shaft and the step of determining a quantity representative of a motor voltage. The detection criterion is then obtained by a step for calculating the criterion according to the speed of rotation of the motor shaft and the quantity representative of the motor voltage. This makes it possible to obtain a criterion, which is both robust and inexpensive, for detecting obstacles in a closure movement of a motor-driven opening.