Opening/Closing Mechanism Zero Position Setting on Slopes
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Solution Overview
Problem
Existing devices for opening and closing bodies, such as vehicle doors, face challenges in accurately setting the zero position when the opening/closing body is movable, especially on slopes, leading to potential operational issues due to incorrect position detection and reduced convenience.
Innovation Solution
A device comprising a closing mechanism with an engaging and engaged portion, a control portion for zero position setting, and an interaction detection system that allows for precise locking and positioning of the opening/closing body, enabling accurate zero position setting even when initially set at an inappropriate position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the integrated value of the pulse signal is reset by the switching member operation, then position detection accuracy is improved, but the zero position setting becomes incorrect when the opening/closing body is movable (e.g., on slope)
Solution Approach 1:
The control portion performs zero position setting in advance based on the interaction detection signal from the closing mechanism, before normal position detection begins. This preliminary action establishes a reliable reference point that is not affected by subsequent pulse signal accumulation errors or slope-induced movements.
Solution Approach 2:
The interaction detection portion of the closing mechanism serves as an intermediary to detect the precise moment when the engaging portion and engaged portion interact. This intermediary detection mechanism provides a reliable trigger for zero position setting, independent of the pulse signal integration method used for continuous position tracking.
2Reliability
If the movement amount of the opening/closing body is limited to prevent operational errors, then position detection reliability is improved, but convenience decreases
Solution Approach 1:
The closing mechanism's interaction detection portion automatically detects when the engaging portion and engaged portion interact, and the control portion automatically performs zero position setting based on this detection. This self-service mechanism eliminates the need for manual intervention or movement restrictions, maintaining both reliability and convenience.
3Ease of operation
If the opening/closing body is allowed to move freely during closing, then ease of operation is improved, but position detection accuracy deteriorates due to slope-induced movement
Solution Approach 1:
The patent replaces reliance on mechanical position tracking (pulse signal integration) with a detection-based approach using the interaction detection portion. The control portion detects the precise moment of interaction between the closing mechanism components and uses this detection signal to set the zero position, substituting mechanical accumulation methods with a detection-triggered electronic setting method that is immune to slope-induced movements.
Data Source
AI summary
A device for opening and closing opening/closing body comprising: an opening/closing body to open/close with respect to an opening of a base body; a closing mechanism; a control portion to control the closing mechanism; and a position detection portion, wherein the closing mechanism includes an engaging portion provided in either one of the base body and the opening/closing body; an engaged portion provided in the other of the base body and the opening/closing body; a closing mechanism drive portion to shift the engaging portion between being an opened state and a closed state; and an interaction detection portion to detect interaction between the engaging portion and the engaged portion; and the control portion carries out zero position setting to set position information to the zero position when the engaging portion shifts to the closed state or to the opened state.