Vehicle Door Latch Smart Lever Detection Switch
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Solution Overview
Problem
The existing door latch systems for vehicles require multiple detection switches to ensure that the automatic opening of the glass window is executed only when the door is closed, the locking/unlocking mechanism is in an unlock state, and the door is opened using the operation handle, leading to complexity in the door latch device structure and control circuit.
Innovation Solution
A door latch device with a meshing mechanism, a locking/unlocking mechanism, a smart lever, and a smart lever detection switch that allows the door to open automatically when the locking/unlocking mechanism is in the unlock position, simplifying the detection and control of the door-opening operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple detection switches are used to detect door state, locking state, and door-opening operation, then the reliability of automatic window opening control is improved, but the device complexity and control circuit complexity increase
Solution Approach 1:
The patent combines the detection of door-opening operation with the existing smart lever mechanism used for unlock position detection. The smart lever is positioned to be operable only when the locking/unlocking mechanism is in the unlock state, so a single detection switch can reliably detect door-opening operations without requiring separate switches for each condition.
Solution Approach 2:
The smart lever serves multiple functions: it detects the unlock position of the locking/unlocking mechanism and simultaneously detects door-opening operations. This multi-functional component eliminates the need for separate detection mechanisms, reducing overall device complexity while maintaining reliable detection capabilities.
2Reliability
If multiple detection switches are used to detect door state, locking state, and door-opening operation, then the reliability of automatic window opening control is improved, but the control circuit complexity increases
Solution Approach 1:
The control circuit is simplified by combining the detection logic for door-opening operations with the existing unlock position detection circuit. The single detection switch works in conjunction with the smart lever's mechanical positioning to provide reliable detection without requiring complex control logic or multiple separate circuit paths.
3Measurement precision
If a smart lever is used that is operable only when locking/unlocking mechanism is in unlock position, then the detection accuracy of door-opening operation is improved, but the device structure becomes more complex
Solution Approach 1:
The smart lever is designed as a movable component that dynamically changes its operability based on the locking/unlocking mechanism state. When the mechanism is locked, the smart lever is positioned to be inoperable; when unlocked, it becomes operable. This dynamic positioning ensures accurate detection of door-opening operations only when permitted, without requiring complex additional structures.
Data Source
AI summary
A door latch device includes: a meshing mechanism configured to be meshable with a striker; a locking/unlocking mechanism configured to be movable to an unlock position where an opening operation of an operation handle provided at the door is enabled and where meshing of the meshing mechanism is releasable, and to be movable to a lock position where the opening operation of the operation handle provided at the door is disabled and where meshing of the meshing mechanism is unreleasable; a smart lever configured to be operable in linking with the opening operation of the operation handle when the locking/unlocking mechanism is in the unlock position, and to be inoperable in linking with the opening operation of the operation handle when the locking/unlocking mechanism is in the lock position; and a smart lever detection switch configured to be detectable an operation of the smart lever.