Dynamic Pinching Threshold Adjustment for Power Window Control
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Solution Overview
Problem
Existing power window devices face erroneous pinching detection due to external disturbances, particularly on rough roads, leading to incorrect operation and excessive load during reverse operation, as they struggle to differentiate between pinching and normal disturbances.
Innovation Solution
A panel member control system that includes a motor, rotation detecting means, and pinching detecting means with a disturbance detecting and correcting mechanism, which adjusts the pinching determination threshold based on the motor's rotational speed and acceleration count value to accurately differentiate between pinching and external disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small pinching determination threshold is used to improve pinching detection sensitivity, then pinching detection accuracy is improved, but erroneous detection increases when the vehicle runs on rough roads
Solution Approach 1:
The pinching determination threshold is made dynamic rather than fixed. The control device adjusts the threshold based on the operating state (normal state or disturbance state) detected through acceleration counting. When vibration acceleration exceeds a threshold for a predetermined time, the system transitions to a disturbance state with a different threshold, thereby adapting to varying road conditions and preventing erroneous detection while maintaining pinching detection accuracy.
Solution Approach 2:
The system changes the pinching determination threshold parameter according to the detected operating state. By monitoring acceleration and determining whether the vehicle is in a normal state or disturbance state, the control device switches between different threshold values, optimizing both pinching detection sensitivity and erroneous detection prevention under different road conditions.
2Reliability
If a long period of duration is used for rough road detection to reduce erroneous detection, then reliability is improved, but pinching detection delay occurs after transitioning from rough road to normal road
Solution Approach 1:
The system uses periodic acceleration monitoring and counting to detect disturbance states. By counting the number of times acceleration exceeds a threshold within a predetermined time period, the system can quickly transition between normal and disturbance states. This periodic detection mechanism allows for rapid state switching, reducing the time loss when transitioning from rough road to normal road conditions while maintaining reliable erroneous detection prevention.
3Reliability
If a large pinching determination threshold is used during disturbance state to prevent erroneous detection, then erroneous detection rate is reduced, but pinch load increases during reverse operation
Solution Approach 1:
The pinching determination threshold is dynamically adjusted based on the operating state. During disturbance states, a larger threshold is used to prevent erroneous detection, while during normal states, a smaller threshold enables sensitive pinching detection with lower pinch load. This dynamic adjustment resolves the contradiction by applying different threshold strategies appropriate to each operating condition.
Solution Approach 2:
The system changes the pinching determination threshold parameter according to the detected state (normal or disturbance). By monitoring acceleration patterns and transitioning between states, the control device optimizes the threshold value to balance erroneous detection prevention and pinch load reduction, applying a larger threshold only when necessary during disturbance states.
Data Source
AI summary
A panel member control system for controlling a panel member includes a motor, a rotation detecting means, and a pinching detecting means. The rotation detecting means detects a rotational speed of the motor. The pinching detecting means detects an occurrence of pinching of an object by the panel member when a pinching indicative value exceeds a pinching determination threshold. The pinching detecting means includes a disturbance detecting means and a correcting means. The disturbance detecting means determines whether the motor is in a disturbed state based on a change in the rotational speed. The correcting means corrects the pinching determination threshold in view of a result of the determination made by the disturbance detecting means.