Closure Panel Pinching Detection Using Estimated Prior Force
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Solution Overview
Problem
Existing closure panel control apparatuses for vehicles face delays in sensing pinching due to increased load transmission through resilient bodies, leading to potential damage and erroneous sensing during external disturbances, such as vehicle door closures.
Innovation Solution
A closure panel control apparatus with a pinching sensing unit that includes a pinching amount computing means, estimating means, determining means, and door state sensing, which computes and estimates pinching amounts, corrects for external disturbances, and determines pinching based on both computed and estimated values to prevent erroneous sensing and delay in load sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pinching sensing is based on motor rotational speed change, then pinching can be detected, but the sensing is delayed due to load transmission through resilient bodies
Solution Approach 1:
The system performs preliminary action by estimating the pinching amount that occurred before the motor rotational speed change was detected. The pinching amount estimating means calculates the pinching amount based on the relationship between the actuator output shaft rotational speed and the closure panel drive speed, allowing the system to determine pinching occurrence earlier than traditional methods that wait for motor speed changes.
Solution Approach 2:
The patent introduces an intermediary mechanism by using the closure panel drive speed as a intermediate parameter to estimate pinching amount. Instead of directly measuring pinching force or waiting for motor speed changes, the system uses the drive speed (which can be measured by position detection means) as an intermediary to calculate and estimate the pinching amount, bridging the gap between actuator movement and actual pinching detection.
2Loss of time
If correction based on estimated pinching amount is applied, then sensing delay is reduced, but erroneous sensing increases during external disturbances
Solution Approach 1:
The system dynamically adjusts the pinching determination threshold based on the current operational state. The pinching determination means compares the estimated pinching amount against a threshold that can be adapted to current conditions, allowing the system to distinguish between genuine pinching events and normal operational variations or external disturbances, thereby reducing erroneous sensing while maintaining early detection capability.
Solution Approach 2:
The system implements feedback by continuously monitoring the relationship between actuator output shaft rotational speed and closure panel drive speed. The pinching amount estimating means uses this feedback loop to calculate estimated pinching amounts in real-time, and the pinching determination means uses this continuous feedback to distinguish between actual pinching events and external disturbances, reducing erroneous sensing.
3Stability of the object's composition
If resilient bodies are used in the drive mechanism, then mechanical compliance is improved, but load transmission delay occurs
Solution Approach 1:
The patent replaces direct mechanical load transmission measurement with a computational approach. Instead of using mechanical means to directly measure and transmit load information through the resilient bodies, the system substitutes mechanical measurement with electronic calculation - using the relationship between actuator rotational speed and panel drive speed to compute the pinching amount, thereby eliminating the time delay inherent in mechanical load transmission through resilient components.
Data Source
AI summary
A controller computes a pinching amount of an object caused by a window glass. The controller estimates a prior pinching amount of the object caused by the window glass before the controller computes the pinching amount of the object. The controller confirms occurrence of the pinching of the object based on the computed pinching amount and the estimated prior pinching amount of the object.