Vehicle Power Window Drive Motor Position Control
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Solution Overview
Problem
The existing opening/closing drive devices for vehicle power windows face a challenge in maintaining activation characteristics of the motor while preventing downward movement of the window glass, as increased friction resistance to prevent downward movement adversely affects motor performance.
Innovation Solution
Incorporating a position detection sensor and controller to detect the position of the opening/closing member and drive the motor to upwardly move the member when it has moved beyond a predetermined threshold, thereby reducing friction resistance and improving motor activation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction resistance is increased to prevent downward movement of the opening/closing member, then reliability is improved, but the motor size increases due to higher activation torque requirements
Solution Approach 1:
The patent replaces the mechanical friction-based fall prevention mechanism with an electronic control system. The controller detects downward movement through position sensors and activates the motor to correct the position, substituting mechanical friction resistance with electronic detection and control to prevent downward movement without requiring high motor torque
Solution Approach 2:
The patent implements a feedback control system where position detection sensors continuously monitor the opening/closing member position, and the controller processes this information to determine when downward movement has occurred. The controller then activates the motor to upwardly move the member back to the correct position, creating a closed-loop system that maintains reliability without increasing motor size
2Reliability
If friction resistance is increased to prevent downward movement of the opening/closing member, then reliability is improved, but activation characteristics of the motor deteriorate
Solution Approach 1:
The patent replaces the mechanical friction-based fall prevention mechanism with an electronic control system. The controller detects downward movement through position sensors and activates the motor to correct the position, substituting mechanical friction resistance with electronic detection and control to prevent downward movement without requiring high motor torque
Solution Approach 2:
The patent uses position detection sensors to detect downward movement early, before it becomes a significant problem. The controller is configured to activate the motor as soon as downward movement beyond a threshold is detected, taking preliminary action to correct the position before the member can fall further, thus maintaining reliability without requiring excessive motor power
Data Source
AI summary
An opening/closing drive device drives an upwardly and downwardly movable opening/closing member. The opening/closing drive device includes a motor, a position detection sensor configured to detect a position of the opening/closing member, and a controller. The controller is configured to drive the motor in order to upwardly move the opening/closing member when determining in a state in which the motor is not driven that the opening/closing member has moved downward to a position corresponding to a predetermined threshold or lower based on a signal from the position detection sensor.