Screen Actuator Angular Position Control for Synchronized Movement
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Solution Overview
Problem
Existing methods for controlling screens with load bars and flexible elements fail to account for irregularities such as increased friction or obstacles, leading to delayed or wedged load bars, which disrupt coordinated movement among multiple screens.
Innovation Solution
A method that controls the angular movement of the winding member with a temporal set value of its instantaneous position, allowing for automatic compensation of delays and coordinated movement among screens, using a PID control loop and an electric actuator with an angular position sensor to manage acceleration and deceleration smoothly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If speed control is used for coordinated movement of multiple screens, then movement synchronization is improved, but irregularities such as delays and wedging cannot be compensated
Solution Approach 1:
The patent implements a feedback mechanism by monitoring the actual angular position of the winding member and comparing it with a temporal set value. When deviations are detected (indicating delays or irregularities), the control system automatically adjusts the motor command to compensate, ensuring both synchronization and reliability across multiple screens.
Solution Approach 2:
The control method dynamically adapts the movement profile by using a temporal set value that evolves over time. Instead of rigid speed control, the system continuously updates the target angular position based on elapsed time and detected deviations, allowing flexible compensation for irregularities while maintaining coordinated movement.
2Speed
If full power start is used for the drive motor, then startup speed is improved, but acceleration cannot be limited to prevent installation deterioration
Solution Approach 1:
The patent applies periodic or staged action by dividing the startup process into phases with different power levels. The motor starts at full power to achieve quick acceleration, then the control system periodically adjusts the power level based on the temporal set value and actual position feedback, limiting acceleration when necessary to prevent harmful forces on the installation.
Solution Approach 2:
The control method changes the operational parameters of the motor dynamically. The power level, acceleration rate, and target speed are not fixed but are adjusted as functions of time and actual system state. This allows the motor to operate at high power when needed while automatically reducing power to prevent installation deterioration during critical phases.
3Loss of time
If temporal set value control is implemented, then delay compensation is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing temporal set values that represent the ideal angular position over time. This lookup table or pre-computed profile allows the control system to compensate for delays by comparing actual position against the predetermined temporal profile, achieving delay compensation without requiring complex real-time calculations or additional hardware.
Data Source
AI summary
A method to be used for controlling a screen (1) including a load bar (2), a flexible element (4) supporting the load bar, and at least one controlled member for winding the flexible member, in order to move the load bar (2) between a first high or low position and a second low or high position, the movement resulting from an angular movement of the winding member. The method includes at least one step in which the angular movement of the of the winding member (52) is controlled with a temporal set value (θ(t)) of the instantaneous angular position (γ(t)) of the winding member (52).