Pinch Sensor Characterization Bench for Powered Doors
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Solution Overview
Problem
The risk of pinching during the closure of motorized openings in vehicles, such as windows and doors, poses a safety concern as existing technologies lack effective detection and prevention mechanisms to stop or reverse motorization quickly in case of limb entrapment.
Innovation Solution
A characterization bench equipped with a module for detecting impacts, an image acquisition system, force measurement means, and a safety module to control motorization, which can produce a logic signal upon impact, correlate crushing stroke and force, and stop or reverse motorization to prevent injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pinch sensor is installed in motorized opening devices to detect limb entrapment, then safety detection capability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a characterization bench as an intermediary system that simulates pinching conditions using a standardized impactor and force measurement means. This mediator allows the pinch sensor to be tested without requiring actual limb entrapment scenarios, thereby improving safety detection capability while avoiding the complexity of implementing real-time biological detection systems.
Solution Approach 2:
The patent creates a simplified copy of the pinching phenomenon by using an impactor that reproduces the mechanical characteristics of limb contact. This copy enables the sensor to be characterized under controlled conditions with standardized forces and displacements, improving detection reliability without adding complex biological sensing mechanisms to the actual motorized opening device.
2Measurement precision
If image acquisition means and force measurement means are added to characterize the sensor, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The characterization system is segmented into distinct functional modules: image acquisition means for visual measurement, force measurement means for mechanical measurement, and processing means for data correlation. This segmentation allows each module to be optimized independently for its specific measurement task, achieving high precision without requiring a monolithic complex system.
Solution Approach 2:
The characterization bench is designed as a universal testing platform that can characterize different types of pinch sensors through standardized procedures. The image acquisition and force measurement means serve multiple functions: they can test various sensor locations, impactor shapes, and force levels, thereby achieving comprehensive measurement precision across different scenarios without proportionally increasing device complexity.
3Reliability
If the characterization bench includes complete safety control and motorization control, then safety response capability is improved, but device complexity increases
Solution Approach 1:
The characterization bench implements feedback loops where the detection module receives signals from the pinch sensor, the processing means analyzes the data, and the motor control means automatically adjusts motorization based on sensor characterization results. This feedback mechanism improves safety response capability by enabling automatic verification and adjustment without requiring complex manual intervention systems.
Solution Approach 2:
The characterization bench performs preliminary characterization of the pinch sensor before actual motorized opening operation. By pre-testing the sensor's detection threshold and response characteristics using standardized impactors and force measurements, the system ensures safety response capability is established in advance, avoiding the need for complex real-time adaptive control during actual operation.
Data Source
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AI summary
The invention relates to a bench for characterising the crush of a pinching sensor (1) for a powered door leaf, provided with a detection module (2) capable of generating a logic detection signal (3), and comprising: a housing frame (4) with the sensor (1) arranged at the periphery thereof; an impactor (8), the impactor and the sensor being mobile relative to one another so that the impactor (8) can contact said sensor (1); a power system (7) for providing said movement; a control means (6) for the power system (7); an image acquisition means (9); an image analysis means (12) capable of measuring the crushing distance (11); a processing module (13) used as an interface between the image analysis means (12) and the detection module (2) for the time-correlation of the logic detection signal (3) with the crushing distance (11) of the sensor (1).