Split Spool Valve Independent Metering
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Solution Overview
Problem
Current hydraulic systems for machines, such as earthmoving and construction machines, face challenges with expensive and complex electrohydraulic valve arrangements that lack independent metering capabilities.
Innovation Solution
A hydraulic system featuring independent metering valves with split spool configurations, push/pull coil actuation, and force feedback mechanisms, along with pressure reducing valves and a selector valve, enables independent control of hydraulic actuator chambers, reducing the need for costly pressure compensators and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional electrohydraulic valve arrangement is used, then the system can control hydraulic actuators, but the system becomes expensive and complex with numerous hardware components
Solution Approach 1:
The valve arrangement is segmented into multiple independent metering valves, each with its own spool and solenoid actuator. This segmentation allows each valve to independently control flow to different actuators, providing versatile independent metering capability while maintaining a modular, manageable system architecture that doesn't excessively increase complexity
Solution Approach 2:
Each metering valve is designed as a universal component capable of controlling multiple actuators through independent spool positioning. The valves can operate in various modes (metering, free pump discharge, tank discharge) and work with different actuator types, providing multi-functionality that reduces the need for specialized components
2Ease of manufacture
If independent metering valves with split spool configurations are used, then cost-effective independent metering is achieved, but the valve structure becomes more complex
Solution Approach 1:
The valve body is segmented into separate spool assemblies, each with its own solenoid actuator and control logic. This modular segmentation allows for standardized manufacturing of individual components that can be assembled into complete valve units, reducing overall manufacturing cost while managing structural complexity through modularity
Solution Approach 2:
The split spool configuration uses replicated components (multiple spools, multiple solenoids) that are manufactured using the same processes and specifications. This copying approach enables economies of scale in manufacturing while the modular repetition manages complexity through standardization
3Device complexity
If pressure compensators are eliminated, then system cost is reduced, but precise pressure control becomes more difficult
Solution Approach 1:
The system replaces mechanical pressure compensators with an electrohydraulic control approach using solenoid-actuated spools and electronic control logic. This substitution eliminates complex mechanical pressure compensation mechanisms while achieving precise pressure control through electronic regulation of valve positioning and flow rates
Solution Approach 2:
The system incorporates feedback mechanisms through pressure sensors and electronic control that monitor and adjust valve spool positions to maintain precise pressure control. This feedback-based electronic control replaces the open-loop mechanical compensation, achieving comparable or superior precision while reducing mechanical complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides cost-effective, efficient, and independent metering of hydraulic systems, reducing drift and improving productivity by regenerating flow within the system, eliminating the need for hydro-mechanical pressure compensators and simplifying the electrohydraulic arrangement.
Implementation Method 1
a push coil configured to push the spool in a first direction
Implementation Method 2
a pull coil configured to pull the spool in a second direction opposite the first direction
Implementation Method 3
a force feedback mechanism configured to balance a force of the push coil and the pull coil
Implementation Method 4
a source of pressurized fluid; a hydraulic actuator including a first chamber and a second chamber
Data Source
AI summary
A hydraulic system is disclosed. The hydraulic system may include a source of pressurized fluid; a tank; a hydraulic actuator including a first chamber and a second chamber; a first independent metering valve disposed between and fluidly connected to the source, the tank, and the first chamber of the hydraulic actuator; and a second independent metering valve disposed between and fluidly connected to the source, the tank, and the second chamber of the hydraulic actuator. Each of the first independent metering valve and the second independent metering valve may include a spool and a valve actuator disposed on one side of the spool. The valve actuator may include a push coil, a pull coil, and a force feedback mechanism configured to balance a force of the push coil and the pull coil.