Vehicle Closure Latch Assembly Power Release Mechanism
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Solution Overview
Problem
Existing closure latch assemblies for vehicle doors with power release mechanisms and emergency inside handle release mechanisms are complex and not intuitive, particularly in scenarios where power is lost, posing a risk of entrapment and failing to meet regulatory requirements for simplicity and functionality.
Innovation Solution
A closure latch assembly with a power release mechanism that shifts the inside handle release mechanism between a Disengaged and Engaged state, utilizing a three-position power release gear to provide both power release and emergency release functions, ensuring the inside handle release mechanism is only activated under emergency conditions such as low power or crash scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inside handle release mechanism is always connected to the latch mechanism for emergency release, then safety during power loss is improved, but device complexity increases and packaging space is consumed
Solution Approach 1:
The inside handle release mechanism's connection to the latch mechanism is made dynamic rather than static. A cam-based switching system automatically engages or disengages the mechanical link between the inside handle and latch based on the power release mechanism's state. When power is available, the connection is disengaged (normal operation). When power is lost, the connection is automatically engaged (emergency mode), providing conditional connectivity without permanent complexity.
Solution Approach 2:
The system performs preliminary action by pre-positioning the cam mechanism and switching components in advance. The cam is designed with specific lobes that automatically trigger the engagement/disengagement of the inside handle connection based on the power release gear's position. This preliminary arrangement ensures that when power failure occurs, the emergency release pathway is already prepared and can be activated immediately without additional complexity during the emergency event.
2Ease of operation
If the inside handle release mechanism is disconnected during normal operation to simplify control, then ease of operation is improved, but safety during power loss deteriorates
Solution Approach 1:
The system incorporates feedback through the cam mechanism that monitors the state of the power release mechanism. The cam's position is determined by whether power is available or lost, and this positional information automatically controls the engagement state of the inside handle release mechanism. When the power release mechanism indicates power loss (through its gear position), the cam automatically shifts to engage the inside handle connection, providing feedback-driven adaptive operation that ensures safety without complicating normal use.
Solution Approach 2:
The switching mechanism between engaged and disengaged states is self-service, requiring no external control input from the user. The cam-based system automatically transitions the inside handle release mechanism's connection state based solely on the power release mechanism's position. During normal operation, the system self-maintains the disengaged state for simplicity. During power loss, it self-transitions to the engaged state for safety, eliminating the need for user intervention or complex control logic.
3Device complexity
If a three-position power release gear is used to provide both power release and emergency release functions, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The three-position power release gear is designed as a universal component that performs multiple functions: it controls both the power release operation (first position) and the emergency release enablement (second and third positions). The gear's three distinct positions serve dual purposes: one position for normal power-actuated release, and two positions for managing the inside handle release mechanism's engagement state. This multi-functionality consolidates what would otherwise require separate mechanisms into a single component, reducing overall device complexity while the cam mechanism compensates for any dimensional variations through its geometric design.
Data Source
AI summary
A closure latch assembly for a motor vehicle closure system includes a power release mechanism and an inside handle release mechanism mechanically connected to an inside door handle. The power release mechanism is used to shift the inside handle release mechanism from a normally Disengaged operating state to an Engaged operating state. In the Disengaged state, the inside handle release mechanism is uncoupled from the latch release chain of components to prevent latch release via actuation of the inside door handle. In the Engaged state, the inside handle release mechanism is coupled for the latch release chain of components to permit latch release via actuation of the inside door handle. The power release mechanism only shifts the inside release mechanism from its Disengaged state into its Engaged state in the event of an emergency condition.