Vehicle Door Handle Inertial Safety System with Dual Mass Locking
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Solution Overview
Problem
Current inertial systems for vehicle door handles are either too sensitive, leading to potential rebounds and unpredictable behavior, or they permanently lock the door, preventing post-crash access.
Innovation Solution
An inertial system with two masses that move in opposite directions to activate a locking device, providing high sensitivity and predictability while preventing rebounds and allowing door opening post-crash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reversible inertial system is used, then the door can be opened after a crash and the system has high reactivity, but rebounds may occur during a crash causing brief unlocking of the door handle
Solution Approach 1:
The inertial system is segmented into two separate inertial masses (first and second inertial masses) that operate independently. Each mass is responsible for detecting acceleration in opposite directions, dividing the detection function to prevent rebound-induced unlocking while maintaining post-crash door opening capability
Solution Approach 2:
The second inertial mass acts as a counterbalance to the first inertial mass, with both masses positioned to move in opposite directions during acceleration. This counterweight arrangement ensures that when one mass moves to trigger locking, the other mass simultaneously moves to prevent unlocking, eliminating rebound effects
2Object-affected harmful factors
If an irreversible inertial system is used, then rebounds are prevented and the system is definitively locked, but the door cannot be opened after the crash
Solution Approach 1:
The locking mechanism is designed to be dynamic rather than static - it locks during crash conditions when acceleration is detected by either inertial mass, but automatically unlocks when acceleration returns to normal levels. This dynamic behavior allows the system to be definitively locked during crash while maintaining post-crash door opening capability
Solution Approach 2:
The system changes its operational parameters based on acceleration conditions. During normal operation, the handle is free to move; during crash conditions (high acceleration), the handle is locked; after crash (return to normal acceleration), the handle returns to free movement. This parameter change allows the system to prevent rebounds during crash while enabling post-crash door opening
3Volume of moving object
If the inertial system is made compact, then the spatial configuration is optimized, but the complexity of achieving high sensitivity and rebound prevention increases
Solution Approach 1:
The two inertial masses and their associated locking mechanisms are merged into a single integrated housing structure. The first and second pivoting parts are combined with the locking device in a compact arrangement where components share space and functional elements, reducing overall system volume while maintaining the complexity of dual-mass operation
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 door opening during a crash while maintaining reversibility and predictability, ensuring the door can be opened after the crash for passenger safety.
Implementation Method 1
a first inertial mass, which, when subjected to an acceleration force acting in a first acceleration direction, is configured to move along a first movement direction from a rest position allowing the opening of the door by actuation of the door handle, to a locking position activating the locking device
Implementation Method 2
a second inertial mass, which, when subjected to an acceleration force acting in a second acceleration direction opposite the first acceleration direction, is configured to move along a second movement direction, from a rest position allowing the opening of the door by actuation of the door handle to a locking position activating the locking device
Data Source
AI summary
An inertial system for a vehicle door handle assembly includes a locking device to prevent the actuation of the door handle upon activation and a first inertial mass. When subjected to an acceleration force acting in a first acceleration direction, the first inertial mass moves along a first movement direction from a rest position allowing the opening of the door by actuation of the door handle, to a locking position activating the locking device. The inertial system also includes a second inertial mass, which, when subjected to an acceleration force acting in a first acceleration direction opposite the first acceleration direction, moves along a second movement direction, from a rest position allowing the opening of the door by actuation of the door handle to a locking position activating the locking device. The first movement direction is opposite the second movement direction.