Power Window Controller Mask Section Adjustment for Entrapment Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power window devices experience erroneous entrapment detection due to shifts in the reference position caused by changes in ambient temperature, which affect the arresting torque of the motor and alter the mask section, leading to inappropriate detection.
Innovation Solution
An opening-closing body controller that includes a motor body, a control unit, and inner and outer temperature detectors, which corrects the mask section based on the detected inner temperature to prevent erroneous entrapment detection by adjusting the section where the entrapment detection process is performed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mask section is set from the fully closed position to a preset position in the opening direction, then entrapment detection is avoided in the reference position area, but erroneous entrapment detection occurs when the reference position shifts due to temperature changes
Solution Approach 1:
The mask section is made dynamic by adjusting its position based on the detected inner temperature of the motor body. The control unit shifts the mask section's starting position according to temperature-induced reference position shifts, allowing the system to adapt to environmental changes and maintain accurate entrapment detection without false positives
Solution Approach 2:
An inner temperature detector provides real-time temperature feedback to the control unit, which then adjusts the mask section position accordingly. This feedback mechanism enables the system to compensate for temperature-related reference position shifts and maintain reliable entrapment detection across varying thermal conditions
2Measurement precision
If the reference position is used for setting the mask section, then the fully closed position can be identified, but the reference position shifts with changes in arresting torque caused by ambient temperature
Solution Approach 1:
The inner temperature detector provides continuous temperature feedback to the control unit, which uses this information to compensate for reference position shifts. By adjusting the mask section position based on temperature data, the system maintains accurate reference position detection despite variations in arresting torque caused by ambient temperature changes
Solution Approach 2:
The system changes the parameter used for mask section positioning from a fixed reference position to a temperature-compensated reference position. The control unit calculates the reference position shift based on inner temperature and adjusts the mask section accordingly, effectively compensating for temperature-induced parameter changes in motor torque characteristics
Data Source
AI summary
An opening-closing body controller includes a motor body that opens and closes an open-close body, a control unit that controls and drives the motor body, and an inner temperature detector that detects an inner temperature of the motor body. The control unit performs an entrapment detection process in a section excluding a mask section that is set from a fully closed position of the open-close body to a preset position in an opening direction of the open-close body. The control unit corrects the mask section in accordance with the inner temperature of the motor body detected by the inner temperature detector.