Tailgate Synchronizer Lock Unit for Selective Latch Release
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Solution Overview
Problem
Dual-mode tailgates in vehicles often lack a mechanism to prevent simultaneous release of latches, allowing the tailgate to open in both fold-down and side-swing modes simultaneously, which can lead to unintended opening and safety issues.
Innovation Solution
A latch system incorporating a synchronizer and lock unit that allows selective release of latches based on handle activation, blocking the release of more than two latches at a time to prevent simultaneous opening modes, while enabling full range of motion for handles even when locked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synchronizer is used to block release of more than two latches at a time, then the tailgate cannot open in both modes simultaneously improving safety, but the device complexity increases due to additional locking mechanisms
Solution Approach 1:
The latch system is divided into multiple independent latches (first latch, second latch, third latch) that can be controlled separately. The synchronizer segments the release control by using separate release assemblies for different latch combinations, allowing precise control over which latches can be released together while maintaining safety.
Solution Approach 2:
The synchronizer acts as an intermediary mechanism between the release handles and the latches. It mediates the release process by receiving input from handles and selectively enabling or blocking latch release based on the current state, preventing simultaneous release of more than two latches without requiring direct complex control at each latch point.
2Reliability
If the lock unit prevents simultaneous latch release, then unintended opening is prevented improving reliability, but the ease of operation decreases due to additional locking controls
Solution Approach 1:
The system performs preliminary actions by pre-configuring the synchronizer to block release of more than two latches before any release attempt occurs. The lock unit is engaged by default in a safe state, and specific actions are required to change the state, ensuring reliability is maintained while allowing operation when needed.
Solution Approach 2:
The synchronizer and lock unit provide dynamic control over latch release based on system state. The mechanism adapts its behavior - blocking release when safety requires it, and allowing release when proper conditions are met - making the system both reliable and operable through state-dependent control logic.
3Reliability
If handles are allowed to pivot freely without releasing latches when locked, then user safety is improved by preventing accidental opening, but the ease of operation is reduced as users cannot easily test handle functionality
Solution Approach 1:
The system segments the handle function into two independent aspects: mechanical rotation capability and latch release function. The handles can rotate freely for testing or adjustment purposes while the latch release remains controlled by the synchronizer, allowing users to verify handle functionality without compromising safety.
Solution Approach 2:
The synchronizer acts as an intermediary that decouples handle movement from latch release. It allows handle rotation to occur freely while blocking the transmission of release force to the latches unless proper conditions are met, enabling safe testing of handle functionality without accidental opening.
Data Source
AI summary
A latch system for a vehicle includes a synchronizer and a lock unit. The synchronizer is configured to block and allow release of a number of latches of the vehicle such that some latches are blocked from being released if other latches are already released. The lock unit is configured to block selectively the release of the number of latches.