Latch Mechanism Detection via Pawl-Claw Segmentation
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Solution Overview
Problem
Existing latch mechanism systems for doors, trunk lids, and tailgates often inaccurately detect the open/closed state due to component dispersion and misalignment, leading to potential accidents and safety concerns.
Innovation Solution
A latch mechanism opening/closing detection system that includes a claw, a pawl member, and a full-lock detection switch. The claw and pawl member engage at half-lock and full-lock points, with the full-lock detection switch being manipulated only at the full-lock point to accurately detect the door's closed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ajar switch operating timepoint is configured to be immediately before full lock to prevent signal errors from component dispersion, then false positive closed signals are reduced, but the door may be erroneously recognized as closed before it is actually fully locked
Solution Approach 1:
The door closing process is divided into two distinct stages: half-lock point detection and full-lock point detection. The pawl member engages the claw at the half-lock point (middle portion of rotation range) and then engages again at the full-lock point (end portion of rotation range). This segmentation allows the system to distinguish between partial closure and complete closure, resolving the contradiction by providing precise detection at the full-lock point while maintaining reliability through the two-stage engagement process.
2Measurement precision
If the ajar switch operates at full lock point to accurately detect closed state, then measurement precision is improved, but component dispersion and misalignment cause false signals
Solution Approach 1:
The pawl member acts as an intermediary mechanism between the claw and the detection system. It provides a mechanical intermediary engagement at the full-lock point that ensures reliable detection. The pawl member's engagement with the claw at the full-lock point serves as a definitive indicator that overrides component dispersion issues, as the mechanical engagement physically confirms complete closure regardless of minor positional variations in other components.
3Device complexity
If a single switch detects both half-lock and full-lock points, then device complexity is reduced, but detection accuracy deteriorates due to inability to distinguish between lock states
Solution Approach 1:
The detection system uses the dynamic sequence of engagements rather than static switch positions. The pawl member dynamically engages the claw at two distinct moments: first at the half-lock point and then at the full-lock point. This dynamic temporal distinction allows a single detection system to recognize two different states by detecting the sequence and timing of engagements, maintaining simplicity while achieving precise state differentiation.
Data Source
AI summary
A latch mechanism opening and closing detection system for accurately detecting the open and closed state of a door including a claw configured to be pushed by a striker and rotated in a fastening direction; a pawl member configured to contact the claw and rotate in an interlocked manner such that the claw engages at a half-lock point corresponding to a middle portion of a rotation range of the claw and at a full-lock point corresponding to an end portion of the rotation range, thereby limiting rotation of the claw in an unfastening direction; and a full-lock detection switch configured not to be manipulated at the half-lock point and configured to be switching-manipulated at the full-lock point by the claw and the pawl member, thereby detecting a state in which the claw is fully fastened to the striker.