Vehicle Mirror Motor Control Voltage Adaptation
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Solution Overview
Problem
Automatic vehicle door mirrors experience motor slip and undesirable clicking noises due to varying vehicle voltage and ambient temperatures, leading to mis-detection of slow-moving motors as slipping or blocked, resulting in improper power delivery.
Innovation Solution
A vehicle memory mirror system that includes a motor, adjuster assembly, and a mirror controller, which detects vehicle battery voltage to control power delivery to the motor, using different algorithms based on voltage thresholds to prevent mis-detection and reduce clicking noises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MMC waits for a predetermined period of time during which slip detection is prohibited, then slow-moving motors are not mis-detected as slipping, but fast-moving motors may slip and produce loud clicking noises
Solution Approach 1:
The patent changes the detection parameters dynamically based on motor speed. Instead of using a fixed prohibition period, the system adjusts the time threshold for slip detection according to the actual motor speed. This allows slow-moving motors to be properly accommodated while maintaining sensitive detection for fast-moving motors, thereby preventing both mis-detection and excessive clicking noises
Solution Approach 2:
The system transitions from a static, fixed-time slip detection approach to a dynamic, adaptive detection mechanism. The prohibition period is no longer constant but is adjusted in real-time based on motor performance characteristics, allowing the system to optimize detection sensitivity for each specific operating condition
2Object-generated harmful factors
If the MMC stops power delivery to the motor when the mirror glass is not moving toward the target position, then motor slip is limited, but slow-moving motors may be stopped before reaching the target position
Solution Approach 1:
The patent modifies the detection parameters adaptively based on motor speed characteristics. The system uses different time thresholds and detection criteria for slow-moving versus fast-moving motors. This allows the system to maintain motor slip limitation while accommodating slow-moving motors that require more time to reach the target position, thereby preventing premature power shutdown
Solution Approach 2:
The system performs preliminary assessment of motor speed characteristics before applying slip detection criteria. By evaluating motor performance in advance and setting appropriate detection thresholds, the system prepares the detection parameters to match the actual motor behavior, preventing false obstruction detection and premature power cutoff
3Device complexity
If the MMC uses fixed slip detection criteria, then the control logic is simple, but detection accuracy varies widely due to vehicle voltage and ambient temperature
Solution Approach 1:
The patent implements adaptive parameter adjustment where detection thresholds and time constants are modified based on operating conditions such as vehicle voltage and ambient temperature. The system calculates appropriate detection parameters dynamically, allowing fixed control logic to achieve variable detection accuracy across different environmental conditions
Solution Approach 2:
The system incorporates feedback mechanisms that monitor actual motor performance and adjust detection criteria accordingly. By continuously evaluating motor response and comparing it against adaptive thresholds, the system maintains high detection accuracy without requiring complex control logic, using feedback to bridge the gap between simple algorithms and variable conditions
Data Source
AI summary
In a vehicle door mirror including a motor and an adjuster assembly driven by the motor for moving a mirror glass connected with the adjuster assembly, a method for controlling delivery of power to the motor is described. The method can include detecting a voltage being supplied by a vehicle battery of the vehicle that includes the vehicle door mirror, and controlling delivery of power to the motor based on the detected voltage. A memory mirror system is also disclosed.