Open-Center Hydraulic Valve Control for Adaptive Flow Distribution
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Solution Overview
Problem
Conventional open center hydraulic systems suffer from inefficient fluid flow management due to the mutual dependency of valve assembly functionalities and fixed relative opening areas, leading to suboptimal performance in controlling hydraulic actuators.
Innovation Solution
The hydraulic valve control unit dynamically adjusts the opening area values of the shunt valve and actuator valves based on user input data, including operational modes, to optimize fluid flow and pressure distribution, using a processor and memory to determine and control these values according to predetermined relations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If valve assembly functionalities are mutually dependent with fixed relative opening areas, then manufacturing simplicity is maintained, but system adaptability and fluid flow efficiency deteriorate
Solution Approach 1:
The valve assembly is segmented into functionally independent valves (shunt valve and actuator valve) with separate control mechanisms. This allows each valve to be controlled independently based on specific operational requirements, enabling the system to adapt to different operating modes without being constrained by fixed functional dependencies.
Solution Approach 2:
The system transitions from fixed opening areas to dynamically adjustable opening areas. The control unit varies the opening areas of the shunt valve and actuator valve based on real-time operational conditions and user input, allowing the system to optimize fluid flow efficiency for different operational modes such as single action, depressurization, and high-pressure low-flow operations.
2Productivity
If conventional valve control is used with fixed opening areas, then device simplicity is maintained, but fluid flow efficiency deteriorates
Solution Approach 1:
The control unit receives user input data indicating desired operational modes and uses this feedback to dynamically adjust the opening areas of the valves. This feedback mechanism enables the system to optimize fluid flow efficiency by adapting valve positions to match actual operational requirements rather than relying on fixed predetermined settings.
Solution Approach 2:
The system changes the operational parameters (opening areas) of the valves based on detected operational conditions. By varying the opening areas dynamically, the system optimizes fluid flow efficiency for different operational modes while maintaining a relatively simple hardware architecture.
3Speed
If the shunt valve opening area is maximized in single action mode, then actuator response speed is improved, but fluid flow control precision deteriorates
Solution Approach 1:
The system dynamically adjusts the opening areas of both the shunt valve and actuator valve based on the operational mode. In single action mode, the shunt valve opening area is maximized to enable rapid actuator response, while the actuator valve opening area is simultaneously optimized to maintain fluid flow control precision. This dynamic coordination resolves the trade-off between speed and precision.
Data Source
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Figure 3A~3C
AI summary
The present invention relates to a hydraulic valve control unit for an open center hydraulic system, the open center hydraulic system comprising a pump, a shunt valve and one or more actuator valves coupled to the shunt valve, wherein each actuator valve is controlling a corresponding actuator's position, the hydraulic valve control unit comprising a processor anda memory, said memory containing instructions executable by said processor, wherein said hydraulic valve control unit is configured to obtain user input data indicative of at least a desired actuator's position,determining opening area values of the one or more actuator valves using a predetermined rela- tion dependent on the user input data,determining an opening area value of the shunt valve using the predetermined relation dependent on the user input data, controlling the shunt valve based on the opening area value of the shunt valve, and controlling the one or more actuator valves based on the opening area values of the one or more actuator valves.The invention further relates to an open center hydraulic system.