Vehicle Window Control Apparatus for Sealing Reliability
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Solution Overview
Problem
Existing openable and closable member control systems, such as those for vehicle windows, face issues with ensuring complete closure and sealing performance, particularly at low voltage conditions, leading to potential water ingress and wind noise due to excessive load on the drive system and deformation of seal members.
Innovation Solution
An openable and closable member control apparatus that includes a drive device and a controller, which determines the start position for full closing, senses voltage and load changes, and adjusts the electric power supply to ensure the openable and closable member is fully closed by stopping power when a predetermined load is reached, thereby preventing excessive force and maintaining sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor is stopped immediately before reaching the full closing position to use inertial rotation, then the openable and closable member can be reliably stopped at the target position, but it is unknown whether the member is actually moved to the full closing position and sealing may be insufficient
Solution Approach 1:
The control device monitors the operational state of the electric motor during inertial rotation and provides feedback to determine when to stop power supply. This feedback mechanism ensures the openable and closable member reaches the precise full closing position while maintaining reliable stopping, resolving the contradiction between stopping reliability and closing position precision.
2Reliability
If the openable and closable member is driven to full closing position, then complete closure is achieved, but excessive collision force is applied to the glass run channel, window frame and drive system
Solution Approach 1:
The control device stops power supply to the electric motor before the openable and closable member reaches the mechanical limit position where collision would occur. This beforehand intervention prevents excessive collision force from being applied to the glass run channel, window frame, and drive system, while still achieving complete closure through controlled deceleration and inertial movement.
3Ease of operation
If the openable and closable member is driven while tilted due to drive force transmission looseness, then the member can be moved to closing position, but a gap is generated between the member and glass run channel causing water ingress and wind noise
Solution Approach 1:
The control device dynamically adjusts the drive force by monitoring the operational state of the electric motor during movement. This dynamic control compensates for drive force transmission looseness, preventing the openable and closable member from tilting relative to the glass run channel, thereby maintaining proper sealing and preventing water ingress and wind noise while preserving movement capability.
Data Source
AI summary
A drive device drives a window glass of a door. A controller, which controls the drive device, executes a step of sensing an amount of load that is generated by contact between a seal member and the window glass after reaching of the window glass to a start position, at which a full closing control operation of the drive device starts. The controller executes a step of determining whether the amount of load reaches a predetermined value that is set to a value to be attained before reaching of the window glass to a mechanical limit position. The controller executes a step of stopping supply of an electric power to the drive device after it is determined that the amount of load reaches the predetermined value. The controller cancels the determining step or changes the predetermined value depending on the amount of voltage of the drive device.