Vehicle Closure Anti-Pinch Detection for Variable Obstacle Stiffness
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Solution Overview
Problem
Existing anti-pinch detection methods for motor-driven closure components in vehicles, particularly those adhering to S5 regulations, face challenges in accurately detecting obstacles with varying stiffness, leading to inconsistent force measurements and potential false anti-pinch events.
Innovation Solution
An anti-pinch detection method that determines a first current change rate and a second current change rate to detect obstacle contact, calculates real-time pinch force based on stiffness and compression distance, and reverses the motor when the pinch force exceeds a threshold set according to the obstacle's stiffness, ensuring consistent force measurement across different stiffness values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single anti-pinch detection threshold is used for all obstacles, then the detection method is simple to implement, but false anti-pinch events occur due to inconsistent force measurements across obstacles with different stiffness
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the anti-pinch detection threshold based on the detected stiffness of the obstacle. Instead of using a fixed threshold, the system modifies the threshold parameter according to the obstacle's stiffness characteristics, enabling consistent force measurements across different obstacle types while maintaining a relatively simple detection framework
Solution Approach 2:
The patent implements dynamics by making the anti-pinch detection threshold adaptive rather than static. The threshold automatically adjusts in real-time based on the detected obstacle stiffness, allowing the system to respond dynamically to different obstacle conditions and eliminate false detections without requiring complex pre-programmed thresholds for each scenario
2Reliability
If the anti-pinch detection threshold is set low to detect soft obstacles, then soft obstacles are detected accurately, but false anti-pinch events occur with hard obstacles
Solution Approach 1:
The patent resolves this contradiction by changing the detection threshold parameter based on obstacle stiffness. For soft obstacles, a lower threshold is applied to ensure accurate detection, while for hard obstacles, a higher threshold is used to prevent false events. This dynamic parameter adjustment allows the system to optimize detection sensitivity for each obstacle type independently
Solution Approach 2:
The patent applies local quality by tailoring the detection threshold to the specific characteristics of each detected obstacle. Instead of using a uniform threshold globally, the system applies locally optimized thresholds based on the stiffness properties of the particular obstacle encountered, ensuring accurate detection for soft obstacles while avoiding false positives with hard obstacles
3Object-affected harmful factors
If the anti-pinch detection threshold is set high to avoid false events with hard obstacles, then false anti-pinch events are reduced, but soft obstacles are not detected accurately
Solution Approach 1:
The patent resolves this contradiction by dynamically changing the detection threshold parameter based on obstacle stiffness classification. When a hard obstacle is detected, a higher threshold is applied to avoid false events, while when a soft obstacle is detected, a lower threshold ensures accurate detection. This adaptive parameter adjustment eliminates the need to choose between the two conflicting requirements
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 method enables quick and accurate detection of obstacles, avoiding false anti-pinch events by tailoring the anti-pinch detection threshold to the obstacle's stiffness, thus meeting S5 regulations and ensuring reliable closure component operation.
Implementation Method 1
a direct current brush motor are widely used to improve comfort in automobile operations. For example, the motor is used to drive to electrically open or close some movable components
Implementation Method 2
a pinch force is required to be less than 100N when a 10 N/mm spring is used to test. In US standard FMVSS118, the pinch force is required to be less than 100N when a 65 N/mm spring is used to test
Data Source
AI summary
The present invention provides an anti-pinch detection method and system comprising: determining a first current change rate according to a current collected in a present period and a previous period; determining a second current change rate according to the current collected in the present period and a target period, there being N periods between the target period and present period; detecting whether a closure component encounters an obstacle according to the second current change rate. If yes, determining the stiffness of the obstacle according to the first current change rate; determining a real-time obstacle compression distance according to a contact position zero point and a motor position collected in real time; and determining a real-time anti-pinch force according to the stiffness of the obstacle and the real-time obstacle compression distance, and controlling a motor to reverse when the real-time anti-pinch force is greater than a preset anti-pinch detection threshold.