Actuator Trajectory Planning for Fast Positioning Without Overshoot
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Solution Overview
Problem
Existing drive systems for process automation lack an easily parameterizable trajectory signal that enables fast and safe regulation of actuator positions, often requiring complex parameter settings and risking overshooting.
Innovation Solution
A drive system with a trajectory planning unit that generates a trajectory signal comprising a straight first signal section and an asymptotic second signal section, parameterizable with only two parameters: maximum velocity and a signal parameter for transition timing, ensuring fast and safe control by maximizing initial velocity while preventing overshooting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a complex parameterization method is used for the trajectory signal, then the control precision and safety are improved, but the ease of operation deteriorates
Solution Approach 1:
The patent transforms a complex multi-parameter trajectory problem into a simple two-parameter solution by changing the mathematical form of the trajectory signal. Instead of using traditional complex parameterization methods, the patent employs a piecewise function with only two parameters (maximum velocity and transition timing) that can be easily determined through automatic procedures, thereby resolving the contradiction between control precision and ease of operation
2Productivity
If the actuator member is moved at high velocity towards the setpoint, then the productivity is improved, but the risk of overshooting increases
Solution Approach 1:
The patent divides the trajectory signal into two distinct sections: a first section with straight-line form for high-speed movement towards the setpoint, and a second section with asymptotic form for safe approach to prevent overshooting. This segmentation allows the system to achieve both high productivity during the main movement phase and high reliability during the critical final approach phase
Solution Approach 2:
The patent dynamically adjusts the velocity profile of the actuator member by using different mathematical forms for different phases of movement. The trajectory signal transitions from a constant velocity (straight line) phase to a decelerating (asymptotic) phase, allowing the system to optimize speed during most of the journey while ensuring safe, controlled approach to the target position
Data Source
AI summary
A drive system (10), in particular for process automation, includes: a trajectory planning unit (3), which is adapted to provide a trajectory signal (xd) on the basis of a setpoint signal (xs), and an actuator unit (2) having an actuator member (1), in particular a valve member, which actuator unit (2) is adapted to control and/or regulate a position of the actuator member (1) on the basis of the trajectory signal (xd). The trajectory planning unit (3) is adapted to provide the trajectory signal (xd) with a first signal section (s1) and a second signal section (s2), the first signal section (s1) having a straight signal form and the second signal section (s2) having a signal form asymptotic to the setpoint signal (xs).