Door Mirror Rotation Control for Raindrop-Shaking Motion
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Solution Overview
Problem
Raindrops on vehicle door mirrors reduce visibility during movement, posing a safety risk.
Innovation Solution
A door mirror rotation control device and method that includes a control part with a motor drive controller and a motor action determination part to detect raindrops and adjust motor drive content, such as rotational speed, direction, and action, to shake off raindrops using high-frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the motor drives the door mirror normally without raindrop detection, then the door mirror switches smoothly between folded and unfolded statuses, but raindrops remain attached to the mirror surface reducing visibility
Solution Approach 1:
The motor drive transitions from a static normal drive mode to a dynamic specific drive mode when raindrops are detected. The specific drive dynamically changes rotation speed multiple times during the door mirror status switching process, creating variable motion patterns that effectively remove raindrops from the mirror surface while maintaining operational functionality
Solution Approach 2:
The specific drive causes the door mirror to vibrate during status switching by repeatedly changing the motor's rotation speed. This mechanical vibration disrupts the attachment of raindrops to the mirror surface, causing them to detach and fall off, thereby improving visibility without requiring additional cleaning mechanisms
2Object-affected harmful factors
If the motor uses high-frequency rotation changes to remove raindrops, then visibility is improved, but the motor drive complexity increases
Solution Approach 1:
The control part is designed to perform multiple functions: it detects raindrops using the raindrop detector, determines whether specific drive is needed through the motor action determination, and executes the appropriate drive pattern. This multi-functional design integrates raindrop removal capability into the existing door mirror control system without requiring separate dedicated components
Solution Approach 2:
The system implements feedback control by using the raindrop detector to monitor the mirror surface condition and providing this information to the motor action determination. Based on this feedback, the system automatically adjusts the motor drive pattern between normal and specific modes, creating a closed-loop control system that responds to actual raindrop presence
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
Improves visibility by effectively removing raindrops from door mirrors, enhancing traffic safety and contributing to sustainable transportation systems.
Implementation Method 1
The motor action determination part is configured to detect raindrop information during drive of the motor
Implementation Method 2
a control part controlling drive of a motor to cause a door mirror to switch between a folded status and an unfolded status
Implementation Method 3
Compared to the normal action, a frequency of rotation changes of the motor during a period until drive of the motor ends is high in the specific action
Data Source
AI summary
A door mirror rotation control device includes a control part controlling drive of a motor to cause a door mirror to switch between a folded status and an unfolded status. The control part includes a motor drive controller controlling drive of the motor and a motor action determination part determining a drive content of the motor. The motor action determination part detects raindrop information during drive of the motor, and determines the drive content of the motor as a normal action or a specific action based on whether the raindrop information is acquired. Compared to the normal action, a frequency of rotation changes of the motor during a period until drive of the motor ends is high in the specific action. The motor drive controller is configured to control drive of the motor in the normal action or the specific action determined by the motor action determination part.