Vehicle Window Anti-Drawing Control with Dynamic Mask Zones
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle window opening devices face issues with erroneous detection of drawn-in objects due to unstable motor characteristic values caused by backlash in the drive system and friction from weather strips, leading to inappropriate anti-drawing control activations.
Innovation Solution
A vehicle window opening device with an open-close controller, drawing determination unit, and initial mask zone setting unit that sets a predetermined mask zone based on the vehicle window's open state, preventing anti-drawing control activation during initial mask zone operation and adjusting threshold values accordingly to minimize false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mask zone length is set to accommodate fully closed window operation, then erroneous detection is prevented, but the drawing detection function is adversely affected when operating from non-fully closed state
Solution Approach 1:
The mask zone length is made dynamically adjustable based on the window's starting position. When the window starts from a fully closed state, a longer mask zone is applied to account for friction and stabilization time. When starting from non-fully closed state, a shorter mask zone is used to maintain rapid drawing detection response. This dynamic adjustment resolves the contradiction between preventing erroneous detection and maintaining detection speed.
Solution Approach 2:
The determination threshold value for motor characteristic values is changed based on the window's starting position. A higher threshold is used when starting from fully closed state to avoid false positives due to friction, while a lower threshold is used when starting from non-fully closed state to ensure timely detection of actual drawing conditions.
2Speed
If the determination threshold value is set low for rapid detection, then drawing detection speed improves, but erroneous detection increases due to motor instability and backlash
Solution Approach 1:
The determination threshold value is dynamically changed based on the window's starting position and operational state. When the window starts from fully closed state or during initial operation, a higher threshold is applied to filter out false positives caused by motor instability and backlash. When the window is in a stable operational state, a lower threshold enables faster detection of actual drawing conditions.
Solution Approach 2:
The threshold value is adjusted dynamically during the operation sequence. The control unit modifies the threshold based on real-time detection of the window's starting position and operational phase, ensuring optimal balance between detection speed and accuracy for each specific operational condition.
3Reliability
If the mask zone is extended to cover the fully closed region, then friction-induced false positives are eliminated, but the detection time for objects drawn in during normal operation increases
Solution Approach 1:
The mask zone is dynamically extended or reduced based on the window's starting position. When starting from fully closed state, the mask zone is extended to cover the friction-affected region, preventing false positives. When starting from non-fully closed state, the mask zone is reduced to minimize detection time delay. This dynamic adaptation resolves the contradiction between reliability and time loss.
Data Source
AI summary
A vehicle window opening device includes an open-close controller, a drawing determination unit, a restriction unit, and an initial mask zone setting unit. The drawing determination unit determines that a vehicle window has drawn in an object when a characteristic value of a motor is greater than or equal to a determination threshold value. The open-close controller executes anti-drawing control based on the drawing determination. The restriction unit restricts the open-close controller from executing the anti-drawing control when the vehicle window is located in the initial mask zone. The initial mask zone setting unit sets an initial mask zone to a normal value when a position where the vehicle window starts to open is located outside a fully closed region and to a fully closed region value that is greater than the normal value when the position where the vehicle window starts to open is located in the fully closed region.