Hydraulic Cylinder Piston Rod Speed Control
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Solution Overview
Problem
Existing industrial truck hydraulic systems lack precision in regulating the movement of loads due to external influences such as pulling loads, oil viscosities, and temperature changes, leading to deviations between actual and desired speed and acceleration.
Innovation Solution
A control unit is implemented to specify target speed and acceleration for the piston rod of hydraulic cylinders, with sensor units measuring actual speed and acceleration, allowing for real-time adjustments to maintain precise movement control, thereby compensating for external disturbances and simplifying the hydraulic system structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hydraulic systems are used to regulate load movement, then the system structure remains simple, but the speed control precision is insufficient due to external influences
Solution Approach 1:
The patent implements a feedback control system where sensors continuously measure the actual speed and acceleration of the load, and the control unit compares these values with target values. Based on the deviation detected, the control unit automatically adjusts hydraulic valve openings to correct the movement parameters, thereby achieving precise speed and acceleration control despite external disturbances.
Solution Approach 2:
The patent replaces conventional mechanical speed control mechanisms with an electronic control system. The control unit uses electronic signals to regulate hydraulic valves based on sensor feedback, substituting purely mechanical regulation with an electromechanical control approach that offers superior precision and responsiveness.
2Reliability
If hydraulic valve openings are adjusted to control speed, then the load speed can be regulated, but external influences cause deviation from desired speed and acceleration
Solution Approach 1:
The control system continuously monitors actual speed and acceleration through sensors and compares them with target values. When deviations are detected caused by external influences such as load variations or friction changes, the control unit automatically adjusts the hydraulic valve openings to compensate, ensuring reliable and accurate movement control throughout the operation.
Solution Approach 2:
The system dynamically adjusts hydraulic valve openings in real-time based on current operating conditions and detected deviations. This dynamic control approach allows the system to adapt to changing external influences during operation, maintaining reliable and accurate speed and acceleration control rather than relying on fixed mechanical settings.
3Adaptability or versatility
If multiple hydraulic cylinders operate simultaneously, then complex movements can be achieved, but coordination stability becomes difficult to maintain
Solution Approach 1:
The control unit receives feedback from sensors monitoring each hydraulic cylinder's actual speed and acceleration. Based on this feedback, the control unit independently adjusts the valve openings for each cylinder to maintain coordination and stability during simultaneous operations, ensuring that complex multi-cylinder movements remain synchronized and stable.
Solution Approach 2:
The control unit serves multiple functions by simultaneously managing several hydraulic cylinders through a single integrated control system. It can independently regulate each cylinder's movement while maintaining overall coordination, providing versatile control capability for complex simultaneous movements without requiring separate control systems for each cylinder.
Data Source
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AI summary
Industrial truck comprising a lifting frame with a load-bearing element, a hydraulic system comprising at least one hydraulic cylinder with a piston rod and a cylinder housing, and a hydraulic power unit, wherein the at least one hydraulic cylinder acts on the lifting frame via the piston rod, at least one sensor unit configured to determine an actual speed and/or an actual acceleration of the piston rod of the at least one hydraulic cylinder, and a control unit configured to specify a target speed and/or a target acceleration for the piston rod of the at least one hydraulic cylinder.to determine a control deviation of the actual speed determined by the at least one sensor unit from the target speed and/or the actual acceleration determined by the at least one sensor unit from the target acceleration and to control the movement speed and/or the acceleration of the piston rod based on the determined control deviation.