Power Window Control Device Impact Detection
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Solution Overview
Problem
Power window control devices with entrapment prevention functions often incorrectly determine foreign material entrapment due to impacts from closing vehicle doors, leading to unnecessary window openings and potential leaving of windows open.
Innovation Solution
The system determines whether entrapment is caused by an impact from closing the vehicle door by monitoring signals from courtesy switches, acceleration sensors, or door lock switches, and if so, it corrects the erroneous determination by fully closing the window glass without driver intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entrapment determination threshold is lowered to detect foreign material entrapment, then the sensitivity of entrapment detection is improved, but the rate of erroneous determination due to door closing impact increases
Solution Approach 1:
An acceleration sensor is introduced as an intermediary device to detect door closing impacts. The sensor measures acceleration values and provides this information to the control unit, which uses it to distinguish between genuine entrapment events and false alarms caused by door impacts, thereby maintaining high detection sensitivity while reducing erroneous determinations
Solution Approach 2:
The system implements feedback by continuously monitoring acceleration data from the sensor and adjusting the entrapment determination logic based on detected impact events. When significant acceleration indicating door closing is detected, the system temporarily modifies its entrapment detection criteria, creating a dynamic feedback mechanism that adapts to operational conditions
2Reliability
If the entrapment determination threshold is raised to avoid erroneous determination from door impact, then the reliability of entrapment determination is improved, but the sensitivity of normal entrapment detection decreases
Solution Approach 1:
The system dynamically adjusts the entrapment determination threshold based on real-time acceleration data. During periods when door closing impact is detected, the threshold is temporarily raised to prevent false alarms. During normal operation, the threshold returns to its sensitive setting, creating a dynamic adaptation that resolves the contradiction between reliability and sensitivity
Solution Approach 2:
The control unit changes the determination parameter (threshold value) based on the operational state detected by the acceleration sensor. When impact conditions are present, the parameter is modified to prioritize reliability; when impact conditions are absent, the parameter is adjusted to maximize sensitivity, thus resolving the contradiction through parameter adaptation
3Reliability
If entrapment prevention control reverses the window glass upon detecting entrapment, then the safety function is improved, but unnecessary window openings occur due to erroneous determination
Solution Approach 1:
The acceleration sensor serves as an intermediary verification mechanism before triggering the window reversal action. By requiring confirmation from the sensor that no door closing impact is occurring, the system ensures that reversal actions are only taken for genuine entrapment events, eliminating unnecessary openings while preserving safety functionality
4Ease of operation
If the driver operates the switch again to fully close the window glass after erroneous reversal, then the window can be properly closed, but the ease of operation is reduced
Solution Approach 1:
The system performs self-correction by automatically detecting erroneous reversal events and autonomously reopening the window to its proper closed position. This self-service capability eliminates the need for driver intervention, recovering both operational convenience and time that would otherwise be lost to additional manual operations
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
This approach prevents unnecessary window openings and ensures the window is fully closed when leaving the vehicle, enhancing the accuracy of entrapment prevention without requiring additional driver actions.
Implementation Method 1
determining whether the determination is caused by an impact generated when closing the vehicle door
Data Source
AI summary
A power window control device is configured to control a motor to open and close a window glass of a vehicle door and perform entrapment prevention control that determines entrapment of foreign material by the window glass and reverses the window glass if determining that foreign material entrapment has occurred. If determined in the entrapment prevention control that the entrapment has occurred while the window glass is closing to fully close, the entrapment prevention control determines whether the determination is caused by an impact generated when closing the vehicle door. If determined that the entrapment has occurred due to an impact generated when closing the vehicle door, the entrapment prevention control determines that the determination of the entrapment is an erroneous determination and switches to a control for fully closing the window glass that has been reversed and opened.