Power Window Control Apparatus Pinching Prevention
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Solution Overview
Problem
Existing openable and closable member control apparatuses, such as power window systems, face issues when attempting to automatically close the window while it is adjacent to the closing position, leading to potential pinching of foreign objects and operational inefficiencies.
Innovation Solution
The apparatus includes a control device that executes a second control process, limiting the automatic closing process when the window is within a predetermined section near the closing position, preventing the window from moving further and avoiding pinching by only allowing the normal closing process to continue until the window is safely cleared of obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the automatic control process is executed when the openable and closable member is located adjacent to the closing position, then the opening can be automatically closed, but a trouble such as pinching of foreign objects may occur
Solution Approach 1:
The movable range of the openable and closable member is divided into a first section (normal closing zone) and a second section (predetermined section near closing position). The control process is segmented to execute different control modes in different sections: automatic control process in the first section and normal control process in the second section. This spatial segmentation resolves the contradiction by allowing automation where safe while preventing it where hazardous.
Solution Approach 2:
The control device determines the operational position in advance before the openable and closable member reaches the critical closing position. By preliminarily identifying when the member enters the predetermined section, the system switches from automatic to normal control process before pinching can occur, preventing the harmful effect rather than reacting to it.
2Speed
If the automatic control process is started when the openable and closable member is adjacent to the closing position, then closing speed is maintained, but operational troubles such as foreign object pinching occur
Solution Approach 1:
The closing trajectory is segmented into two distinct zones with different control characteristics. The first section allows high-speed automatic closing to maintain efficiency, while the second section (predetermined section) enforces normal control process for safe, controlled stopping. This segmentation allows the system to achieve both fast closing and safety by applying appropriate control in each zone.
Solution Approach 2:
The automatic control process is designed to complete the closing action quickly through the first section and skip directly to the normal control process in the second section. The system rushes through the automatic closing phase before the hazardous zone is reached, minimizing the time spent in automatic mode while ensuring safety in the critical final position.
Data Source
AI summary
In a power window apparatus, which controls a lifting mechanism to drive a window glass from an opening position toward a closing position, a control unit is capable of executing: an automatic closing process that controls the lifting mechanism such that the lifting mechanism keeps driving the window glass until the window glass reaches the closing position; and a normal closing process that controls the lifting mechanism such that the lifting mechanism drives the window glass toward the closing position only throughout a time period of receiving a user operational input through an operation switch. The control unit executes only the normal closing process between the automatic closing process and the normal closing process when the operation switch receives the user operational input while the window glass is located within a predetermined section in a movable range of the window glass.