Reach Carriage Speed Control via Closed-Loop Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial trucks with reach carriages often fail to maintain the specified speed due to external influences like manufacturing tolerances, frictional forces, and material wear, leading to inaccurate speed control and unwanted vibrations, which can result in unsafe high speeds or slowed workflows.
Innovation Solution
An industrial truck equipped with sensors to measure actual speed and deformation, and a control unit that adjusts the movement speed of the reach carriage to match the specified target speed, compensating for external factors and actively damping vibrations to ensure precise speed control and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a hydraulic drive system is used to control the speed of the lifting frame's sliding carriage, then the system can achieve basic speed control through valve characteristic curves, but the actual speed deviates from the set speed due to external influences such as manufacturing tolerances, fluctuating frictional forces, material wear, and other static or dynamic forces
Solution Approach 1:
The patent implements a closed-loop feedback control system where a sensor measures the actual speed of the sliding carriage and feeds this information back to the control unit. The control unit compares the measured speed with the set speed and automatically adjusts the manipulated variable to the hydraulic valve to eliminate speed deviations, thereby maintaining consistent actual speed despite external disturbances.
Solution Approach 2:
The patent replaces the purely mechanical/hydraulic speed control system with an electronically controlled system. The control unit processes speed feedback signals and dynamically adjusts the hydraulic valve actuation, substituting manual or open-loop mechanical control with automated electronic regulation to achieve more precise and reliable speed control.
2Productivity
If the push carriage is moved quickly to maintain high workflow speed, then productivity increases, but unwanted oscillation of the push mast and load occurs
Solution Approach 1:
The patent applies dynamic control by continuously adjusting the speed profile of the push carriage based on real-time feedback. The control system modulates the actuation forces to maintain optimal dynamic behavior, allowing high speeds while preventing mast oscillation through active damping and adaptive speed regulation rather than relying on fixed mechanical constraints.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Industrial truck comprising a lifting frame with a load part for carrying a load, a push carriage acting on the lifting frame for moving the lifting frame forward and backward, at least one sensor designed to measure the actual speed of the push carriage, and a control unit designed to specify a target speed for the push carriage, to determine a control deviation of the actual speed measured by the at least one sensor from the target speed, and to control the movement speed of the push carriage based on the determined speed deviation.