Vehicle Door Latch Control to Prevent Incomplete Closure
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Solution Overview
Problem
Existing vehicle door control systems fail to prevent the latch from engaging properly when a user accidentally operates the unlatch switch during the closing of the door, leading to incomplete door closure.
Innovation Solution
A vehicle door control system that includes a door sensor to detect the opened/closed state, a latch actuator, an unlatch switch, and a controller that prevents unlatch operations during door opening, allowing unlatch operations only when specific conditions are met, such as multiple switch activations within a time limit or a predetermined long press, to ensure proper door closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the unlatch switch is operated to release the latch, then the door can be opened, but accidental operation during door closing causes the latch to fail to engage
Solution Approach 1:
The controller checks the door closed state in advance before executing the unlatch operation. By detecting whether the door is fully closed before activating the latch actuator, the system prevents accidental unlatch operations during door closing, ensuring the latch only releases when the door is properly positioned.
Solution Approach 2:
The system uses a door closed state detection mechanism that provides feedback to the controller. This feedback signal indicates whether the door has reached the fully closed position, allowing the controller to determine whether to permit or prohibit the unlatch operation based on the current door state, thereby preventing closure defects.
2Speed
If the latch actuator is driven immediately when the unlatch switch is operated, then the latch releases quickly, but the door may not be fully closed causing incomplete closure
Solution Approach 1:
The controller performs a preliminary check of the door closed state before activating the latch actuator. This preliminary action ensures that the door has reached the fully closed position before the latch release operation begins, guaranteeing precise door closure while maintaining quick latch response when conditions are met.
Data Source
AI summary
A vehicle door control system includes a courtesy switch that detects an opened/closed state of a side door, a latch actuator that performs an unlatch operation for releasing a latch that holds the side door in a closed state, an unlatch switch that is provided in a vehicle compartment and is operated by a user when releasing the latch, and a controller that causes the latch actuator to perform the unlatch operation when the unlatch switch is operated. The controller prevents the unlatch operation from being executed in a period during which the side door is in an opened state, even when the unlatch switch is operated.