Vehicle Sliding Door Pressure Sensing with Dynamic Threshold Control
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Solution Overview
Problem
Conventional sliding door devices for vehicles often fail to detect objects or occupants jammed between the sliding door and the door opening, leading to potential injuries and accidents, due to limitations in pressure sensing and erroneous sensing caused by inclines and temperature changes.
Innovation Solution
A sliding door device equipped with a pressure switch, electronic control unit, and opening and closing valve, which uses a pneumatic line connected to a door weather strip to sense internal pressure changes and control the sliding door's movement, ensuring it opens if an object or occupant is jammed, and includes a solenoid valve to prevent false triggers from temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined interval (e.g., 30 mm) is set before the sliding door is completely closed to ignore jamming sensing, then erroneous sensing is prevented and the sliding door can be fully closed, but objects or occupants smaller than the sensing threshold may be damaged or injured
Solution Approach 1:
The patent changes the pressure sensing threshold parameter dynamically. When the sliding door is within a predetermined distance from complete closure, the control unit lowers the pressure threshold value, making the system sensitive enough to detect small objects or body parts that would otherwise go unnoticed. This parameter adjustment allows the system to maintain high sensitivity during the critical final closing phase while avoiding false alarms during normal operation.
Solution Approach 2:
The patent implements dynamic control of the pressure threshold based on the sliding door's position. The control unit adjusts the threshold value according to the distance between the sliding door and the door opening, creating a dynamic sensing system that adapts to different operational phases. This dynamic approach enables the system to be less sensitive during most of the closing process and highly sensitive only when needed in the final approach.
2Reliability
If the pressure threshold is set high (e.g., 4.5 kgf) to prevent false triggers from temperature changes, then temperature-induced malfunctions are reduced, but small objects or body parts (e.g., 30×60 mm) jammed in the door are not detected
Solution Approach 1:
The patent implements dynamic adjustment of the pressure threshold based on the sliding door's position relative to the door opening. When the door is within a predetermined distance from complete closure, the control unit lowers the threshold value to increase sensitivity for detecting small objects. This dynamic approach allows the system to maintain high sensitivity during the critical final closing phase while avoiding false alarms during normal operation caused by temperature changes or other environmental factors.
Solution Approach 2:
The patent changes the pressure sensing threshold parameter dynamically based on operational context. The control unit monitors the distance between the sliding door and door opening, and automatically adjusts the pressure threshold value accordingly. This parameter adjustment enables the system to differentiate between normal pressure variations (temperature changes) and actual jamming conditions (small objects or body parts), resolving the contradiction between false trigger prevention and sensitivity.
3Measurement precision
If the sliding door closes completely without a predetermined interval, then jamming detection sensitivity is maximized, but erroneous sensing occurs on inclines where the door closes by self-load before the micro switch senses closure
Solution Approach 1:
The patent implements dynamic control of the pressure threshold based on the sliding door's position. The control unit adjusts the threshold value according to the distance between the sliding door and the door opening, creating a dynamic sensing system that adapts to different operational phases. This dynamic approach enables the system to be less sensitive during most of the closing process and highly sensitive only when needed in the final approach.
Solution Approach 2:
The patent changes the pressure sensing threshold parameter dynamically. When the sliding door is within a predetermined distance from complete closure, the control unit lowers the pressure threshold value, making the system sensitive enough to detect small objects or body parts that would otherwise go unnoticed. This parameter adjustment allows the system to maintain high sensitivity during the critical final closing phase while avoiding false alarms during normal 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
Effectively prevents objects or occupants from being jammed during door closure, improving sensing accuracy and safety by ensuring the sliding door opens when internal pressure exceeds a threshold, even for small-width obstructions, thus reducing the risk of injury and accidents.
Implementation Method 1
a pressure sensing unit integrated with the base and extending from the base, having a hollow closed section
Implementation Method 2
an elastic sealing unit integrated with the base and extending from the base and protruding above the pressure sensing unit... The elastic sealing unit may be bent toward the outside of a vehicle compartment by the lever when an external force is applied to press the pressure sensing unit
Data Source
AI summary
A sliding door device for a vehicle includes a sliding door installed to be slidingly moved, a door weather strip attached to the sliding door, a pressure switch for sensing internal pressure of the door weather strip, a pneumatic line for connecting the door weather strip and the pressure switch to communicate with each other, an electronic control unit (ECU) for receiving a sensing signal of the pressure switch to control opening and closing of the sliding door, and an opening and closing valve for having the pneumatic line communicate with the atmospheric pressure or blocking the pneumatic line from the atmospheric pressure. Therefore, it is possible to effectively prevent an object or an occupant from being jammed in a process of closing the sliding door.