Electric Door Jam Detection Using Sectioned Current Integration
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Solution Overview
Problem
Conventional power tailgate systems fail to detect door jamming caused by insignificant current variations, leading to potential safety accidents and injuries due to delayed recognition of dragging forces during operation.
Innovation Solution
A method and system that classify the time-current profile of an electric actuator into sections, set references for determining events, integrate current values over time, and stop or reverse the door operation when integrated amounts exceed preset thresholds, distinguishing between soft and rigid objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple current variation threshold logic is used for jamming detection, then the device complexity is reduced, but the measurement precision and reliability of jamming detection deteriorates when current variation is insignificant
Solution Approach 1:
The time-current profile is segmented into multiple sections (acceleration section, constant speed section, deceleration section) with different reference current values assigned to each section. This segmentation allows the system to use section-specific thresholds for jamming detection, improving detection precision without requiring overly complex global detection logic.
Solution Approach 2:
The detection reference values are made dynamic by setting different reference current values for different operational sections of the door. The control module dynamically selects the appropriate reference value based on the current operational phase, allowing adaptive detection that maintains high precision across varying operational conditions without increasing overall system complexity.
2Reliability
If a high current variation threshold is set for jamming detection, then false detections are reduced, but the reliability of detecting actual jamming events with insignificant current variation deteriorates
Solution Approach 1:
Different reference current values (local detection thresholds) are applied to different operational sections of the door movement. The acceleration section has one reference value, the constant speed section has another, and the deceleration section has a third. This local quality approach ensures that each section is monitored with an appropriately calibrated threshold, preventing both false detections and missed detections.
Solution Approach 2:
The detection parameter (reference current value) is changed based on the operational section. By adjusting the reference current value according to the door's operational phase, the system maintains high detection reliability across all conditions. The control module changes the reference parameter dynamically, ensuring that even small current variations are detected when they occur during critical phases.
3Productivity
If the door operation continues without integration checking, then the productivity is maintained, but the safety and reliability deteriorate when dragging force is generated
Solution Approach 1:
The integration checking process operates continuously during door operation without interrupting the motor drive. The control module continuously integrates the motor current and compares it against the threshold while the door is moving, maintaining both continuous operation (productivity) and continuous safety monitoring (reliability).
Solution Approach 2:
The system implements feedback by continuously monitoring the integrated current value and comparing it against the threshold. When the integrated value exceeds the threshold, the system provides feedback by stopping or reversing the door operation. This feedback mechanism ensures safety without requiring interruption of the operational flow, maintaining productivity while preventing safety accidents.
Data Source
AI summary
A method for preventing door jamming can include classifying an entire section into at least two or more sections by measuring a variation amount of current for opening and closing an electric door, setting a reference for determining whether an event occurs and for reversing an opening and closing operation of the electric door, determining whether the event occurs during the opening and closing operation of the electric door based on the reference, checking whether an integrated amount of a variation amount of current for driving the electric door, which is generated by the event, is greater than a threshold value based on it being determined that the event exists; and stopping the opening and closing operation of the electric door based on the integrated amount being greater than the threshold value, and a system for the same.