Vehicle Door Latch With Parallel Mechanical-Electrical Unlocking
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Solution Overview
Problem
Conventional door latches can leave users locked out after electrically opening the door, as the latch remains in a locked position despite electrical release.
Innovation Solution
A door latch mechanism that integrates both mechanical and electrical release systems, ensuring synchronization and parallel operation, allowing unlocking via either method, preventing users from being locked in or out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electrical release mechanism is used to unlock the door latch, then the ease of operation is improved, but the reliability deteriorates because the latch may remain in locked position causing users to be locked out
Solution Approach 1:
The patent combines the electrical release mechanism and the mechanical override mechanism into a unified system. The electrical release lever and mechanical override lever are integrated such that both mechanisms share common components (pawl, claw, central opening lever) and work together to ensure reliable unlocking. This merging ensures that electrical activation and mechanical activation both lead to the same reliable unlocked state, eliminating the risk of being locked out.
Solution Approach 2:
The patent implements a feedback mechanism where the state of the door latch is continuously monitored and confirmed through multiple pathways. The mechanical override function serves as a feedback verification that the electrical release has successfully unlocked the latch. The synchronized movement of levers and the shared pawl-claw mechanism provide feedback that both release methods achieve the same reliable result, ensuring the user is not locked out.
2Ease of operation
If a mechanical override function is added to allow unlocking from inside, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent creates a universal release mechanism where the same core components (pawl, claw, central opening lever) serve multiple functions. The central opening lever is driven by both the electrical release lever and the mechanical override lever, making it a multi-functional element. This universality allows the system to provide both electrical and mechanical unlocking capabilities while using a shared mechanical foundation, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent employs a nested arrangement where the mechanical override lever and electrical release lever are integrated within a shared mechanical structure. The override lever is nested within the release mechanism, and both levers interact with the same pawl and claw assembly. This nesting allows the mechanical override function to be incorporated without adding separate, independent mechanisms, thus minimizing the increase in device complexity.
3Reliability
If mechanical and electrical release kinematics work in parallel, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the mechanical and electrical release kinematics into a single integrated mechanism. Both release pathways converge on the same central opening lever, which then drives the pawl away from the claw to unlock the latch. This merging of kinematics ensures that both electrical and mechanical activation result in the same reliable unlocked state, improving reliability while avoiding the complexity of entirely separate mechanisms.
Solution Approach 2:
The central opening lever serves as a universal intermediary that is driven by both the electrical release lever and the mechanical override lever. This multi-functionality allows the system to handle both release types through a common mechanical pathway, ensuring synchronized operation and reliable unlocking without requiring duplicate mechanical components, thus limiting the increase in device complexity.
Data Source
AI summary
A door latch for closing a door of a vehicle, such as a motor vehicle, includes a retention unit, an electrical gear wheel, an inner release lever, a central opening lever being driven in active position by the movement of the inner release lever or by the electrical gear wheel, an outer release lever, and a locking lever. The locking lever can be moved from the locked position to the unlocked position by the movement of the central opening lever driven in movement by the inner release lever from the rest position to the active position and by the movement of the electrical gear wheel from the rest position to the active position. The locking lever remains in the unlocked position after a releasing of the door latch.