Shape-Memory Alloy Wire Actuator for Vehicle Glove Box Latch
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Solution Overview
Problem
Existing vehicle compartment actuators lack efficient and reliable mechanisms for user-controlled access, particularly in glove box compartments, where manual operation can be cumbersome and unreliable.
Innovation Solution
A latch system utilizing a shape-memory alloy wire actuator, coupled with a control system and wire guide, allows the lid of the glove box to transition between closed and open positions in response to user input, providing a power-driven and rapid mechanism for access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual latch operation mechanism is used in the glove box, then the device complexity is reduced, but the ease of operation deteriorates and reliability worsens
Solution Approach 1:
The patent replaces the manual mechanical latch operation with an automated electromechanical system. A actuator assembly with a movable component and engagement component automatically engages and disengages the latch mechanism when the glove box lid transitions between closed and open positions, eliminating the need for manual manipulation of latch components by the user.
Solution Approach 2:
The latch system performs self-service by automatically engaging when the lid is closed and self-releasing when the lid is opened. The actuator assembly detects the lid position and autonomously controls the latch engagement without requiring user intervention, making the system serve itself.
2Reliability
If a manual latch operation mechanism is used in the glove box, then the device complexity is reduced, but the reliability deteriorates
Solution Approach 1:
The patent replaces the manual mechanical latch operation with an automated electromechanical system. A actuator assembly with a movable component and engagement component automatically engages and disengages the latch mechanism when the glove box lid transitions between closed and open positions, eliminating the need for manual manipulation of latch components by the user.
3Speed
If a shape-memory alloy wire actuator is used, then the speed of latch operation is improved, but the energy consumption increases
Solution Approach 1:
The patent utilizes phase transitions of shape-memory alloy wire to achieve rapid actuator movement. The shape-memory alloy wire transitions between martensitic and austenitic phases in response to temperature changes, enabling quick and reliable actuation of the latch mechanism without requiring continuous energy input.
Solution Approach 2:
The patent changes physical parameters of the shape-memory alloy wire, specifically its temperature, to control the actuation process. By heating the wire above its transformation temperature, it undergoes a phase change that causes it to contract or expand, driving the actuator component to move and thereby operating the latch at high speed.
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 solution enables quick and reliable user access to the glove box by leveraging the shape-memory alloy wire's rapid length change, providing a forceful and controlled movement of the latch, ensuring efficient operation with minimal manual effort.
Implementation Method 1
an actuator including a shape-memory alloy wire coupled to the latch to move the latch in response to changes in length of the shape-memory alloy wire
Data Source
AI summary
A vehicle includes a compartment mounted to a frame of the vehicle. The compartment includes a box coupled to a vehicle in a fixed position relative to the vehicle and a latch system coupled to the glove to allow a user access to the box. The latch system includes a shape-memory alloy wire guided by a pulley during actuation of the latch system.