Vehicle Closure Pinch Detection Threshold Adjustment
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Solution Overview
Problem
Existing control apparatuses for closure devices, such as power windows and sunroofs, falsely detect foreign bodies being pinched due to external disturbances, particularly when a vehicle is running, leading to unnecessary reverse operations or missed pinches, as they struggle to differentiate between pinch loads and normal operational variations.
Innovation Solution
A control apparatus with a vehicle speed detecting means, a disturbance detecting means, and a threshold value setting means that adjusts detection sensitivity based on vehicle speed and disturbance levels, setting different threshold values for stationary, running, and rough-road conditions to prevent false pinch detection without increasing pinch load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold value is used for pinch detection, then the detection simplicity is maintained, but false detection occurs when the vehicle is running due to external disturbances
Solution Approach 1:
The threshold value is changed from a fixed value to a dynamic value that automatically adjusts based on vehicle speed. When the vehicle is stationary, a first threshold value is used; when the vehicle is running, a second threshold value is used. This dynamic adjustment resolves the contradiction by maintaining detection simplicity while improving reliability under different operating conditions.
Solution Approach 2:
The detection threshold parameter is changed based on vehicle operating conditions. The system switches between different threshold values (first threshold when stationary, second threshold when running) to adapt to varying disturbance levels, thereby maintaining both simplicity and reliability.
2Reliability
If the threshold value is increased to prevent false detection during vehicle operation, then false detection is reduced, but pinch detection sensitivity decreases and pinch load increases
Solution Approach 1:
The threshold value dynamically adapts to vehicle operating conditions. When the vehicle is stationary, a lower first threshold value maintains high detection sensitivity. When the vehicle is running, a higher second threshold value prevents false detection. This resolves the contradiction by applying different sensitivity levels appropriate to each operating condition.
Solution Approach 2:
Different threshold values are applied to different operating conditions (stationary vs. running). The system uses a first threshold value for stationary conditions and a second threshold value for running conditions, optimizing detection performance for each specific situation rather than using a single uniform threshold.
Data Source
AI summary
A control apparatus for a closure device includes pinch detector for detecting a foreign body being pinched by an opening/closing member when the variation degree of a movement of the opening/closing member reaches a predetermined threshold value. When this control apparatus for a closure device determines that a vehicle is running, the threshold value is set at a second threshold value, which is reduced in a detection sensitivity of pinch as compared with a first threshold value set when the vehicle is stationary. When the apparatus detects that a load not smaller than a predetermined value is applied by disturbance to the opening/closing member in a closing direction, the threshold value is set at a third threshold value, which is reduced in the detection sensitivity of pinch as compared with the second threshold value.