Vehicle Door Latch Bypass Mechanism for Impact Safety
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Solution Overview
Problem
Existing vehicle door latch systems are prone to inadvertent unlatching during lateral acceleration, such as in a side impact, due to the exterior door handle shifting outwardly, which can cause the latch to release unintentionally.
Innovation Solution
A latch system incorporating a bypass mechanism with linkages and a locking member that distinguishes between normal and high-speed movements of the door handle, ensuring the latch remains engaged during rapid movements, thereby preventing unintentional unlatching during crashes or impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door handle is connected directly to the latch mechanism, then the door can be opened easily by normal handle movement, but the latch may release unintentionally during lateral acceleration or side impact
Solution Approach 1:
The bypass mechanism dynamically changes its state based on the speed of handle movement. During normal operation, the mechanism allows linkage between handle and latch. During high-speed impact, the mechanism automatically disconnects the linkage, preventing unintentional latch release while maintaining normal operation
Solution Approach 2:
The bypass mechanism acts as an intermediary between the door handle and latch mechanism. It includes a bypass member with engagement surfaces that can connect or disconnect the first and second linkages, serving as a protective mediator that filters out harmful high-speed movements
2Reliability
If counterweights or inertia locks are added to prevent inadvertent unlatching, then latch stability during lateral acceleration improves, but device complexity increases
Solution Approach 1:
The system changes the operational parameter of velocity to control latch behavior. The bypass mechanism uses the speed of handle movement as a discriminating parameter, allowing normal low-speed operation while blocking high-speed impact-induced unlatching, avoiding the need for complex counterweights or inertia locks
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents the door latch from releasing during high-speed movements caused by vehicle impacts, maintaining door security and preventing unintended opening.
Implementation Method 1
When the bypass mechanism is in its home configuration, movement of the first linkage relative to the second linkage at a second velocity that is significantly greater than the first velocity causes the bypass mechanism to shift from its home configuration to its bypass configuration
Data Source
AI summary
A latch system for vehicle doors includes a bypass mechanism that mechanically disconnects a linkage assembly if an exterior door handle is moved towards an open position at a high speed. The bypass mechanism ensures that the door latch mechanism does not unlatch in the event a crash causes the exterior door handle to move open at a high speed, while providing for normal unlatching operation if the exterior door handle is opened at a relatively low velocity by a user.