Power Window Control Apparatus Interposition Detection
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Solution Overview
Problem
Existing power window control systems face issues with erroneous foreign matter detection near the full close position due to motor rotational speed fluctuations and contact with window frames, leading to impact noise and improper closure forces.
Innovation Solution
An open-close body control apparatus with a control unit, position detection unit, physical quantity detection unit, and determination unit that distinguishes between ordinary and full close position regions to accurately detect interposition and adjust motor control, preventing reverse rotation at the full close position to avoid maximum torque and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interposition determination is performed using motor rotational speed variation near the full close position, then foreign matter detection accuracy is improved, but erroneous determination occurs due to speed fluctuations from window frame contact
Solution Approach 1:
The patent divides the window closing process into distinct regions: ordinary region and full close position immediately ahead region. By segmenting the detection zones, the system applies different determination rules to each region, avoiding erroneous detection in the full close region while maintaining accurate detection in the ordinary region.
Solution Approach 2:
The patent applies different interposition determination criteria to different spatial regions during window closing. In the ordinary region, standard rotational speed variation threshold comparison is used, while in the full close position immediately ahead region, determination is avoided due to expected speed fluctuations from weather strip contact.
2Reliability
If the windowpane is fully closed with large force, then reliable full closure is achieved, but impact noise and collision damage occur
Solution Approach 1:
The patent performs preliminary interposition determination in the ordinary region before reaching the full close position. If foreign matter is detected, the system takes preliminary action to prevent the window from closing further, avoiding impact noise and collision damage while ensuring reliable closure when no foreign matter is present.
Solution Approach 2:
The patent continuously monitors motor rotational speed and compares it against thresholds during the closing process. This feedback mechanism allows the system to detect foreign matter interposition and adjust the closing action accordingly, preventing excessive force application near the full close position while maintaining reliable closure.
Data Source
AI summary
A motor is driven to rotate in a closing direction in an ordinary region other than a full close position immediately ahead region. An interposition determination unit determines whether or not interposition occurs while a windowpane is closing. If the interposition determination unit determines that interposition occurs, the motor is driven in a reverse direction to open the windowpane by a predetermined amount. The interposition determination unit continuously determines interposition after the closing windowpane enters the full close position immediately ahead region. If the determination unit determines that the interposition occurs while the windowpane is closing in the full close position immediately ahead region, the control unit stops driving the motor to stop the windowpane.