Parallel-Spool Hydraulic Control for Compact Electronic Actuation
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Solution Overview
Problem
Existing hydraulic systems for construction equipment have complex structures and large sizes due to mechanical control methods, even when transitioning to electronic control types.
Innovation Solution
The hydraulic system incorporates a main hydraulic pump, parallel flow paths, electronic proportional pressure reducing valves, and control spools connected in parallel, allowing for electronic control and simplification of the system structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical control methods are used in hydraulic systems, then the system can operate various driving apparatuses, but the entire structure becomes complicated and the size is unavoidably increased
Solution Approach 1:
The patent replaces mechanical control methods with electronic control methods. Electronic proportional pressure reducing valves and electronic proportional control valves are used instead of mechanical control mechanisms, allowing the system to maintain control capability while significantly simplifying the overall structure and reducing the number of mechanical components required
Solution Approach 2:
The patent implements a common flow path that serves multiple functions: it acts as both a center bypass flow path and a running signal flow path. This multi-functional design eliminates the need for separate mechanical control flow paths, thereby reducing system complexity while maintaining full control capability for various driving apparatuses
2Ease of operation
If mechanical control methods are used in hydraulic systems, then the system can operate various driving apparatuses, but the size is unavoidably increased
Solution Approach 1:
By substituting mechanical control components with electronic control components, the patent reduces the physical size of the control valve assembly. Electronic proportional valves require less space than their mechanical counterparts, leading to a more compact overall hydraulic system while maintaining full control capability
Solution Approach 2:
The common flow path design allows a single hydraulic passage to serve multiple control functions simultaneously. This eliminates the need for separate mechanical control flow paths that would increase system size, achieving space-efficient design without compromising control capability
3Extent of automation
If electronic control-type hydraulic control valves are used with mechanical valve bodies, then the control type changes to electronic, but the structure remains complicated and the size is unnecessarily large
Solution Approach 1:
The patent fully implements electronic control by using electronic proportional pressure reducing valves and electronic proportional control valves. The valve bodies are designed to work with electronic actuators rather than mechanical control mechanisms, achieving complete electronic automation and significantly simplifying the valve structure by eliminating complex mechanical control components
4Extent of automation
If electronic control-type hydraulic control valves are used with mechanical valve bodies, then the control type changes to electronic, but the size is unnecessarily large
Solution Approach 1:
By replacing mechanical valve bodies with electronically-actuated valve bodies, the patent reduces the overall size of the hydraulic control valve. Electronic actuators are more compact than mechanical control mechanisms, allowing for a more compact valve design that maintains full electronic control capability
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
This configuration simplifies the entire structure and reduces the size of the hydraulic system, enabling efficient electronic control and improved performance in construction equipment.
Implementation Method 1
a plurality of electronic proportional pressure reducing valves (710) adjusting a pilot pressure that is applied to an end of each of the plurality of control spools (510) in proportion to an input current signal
Implementation Method 2
a main hydraulic pump (300) discharging a hydraulic fluid; a parallel flow path (610) through which the hydraulic fluid discharged by the main hydraulic pump (300) moves
Data Source
AI summary
A hydraulic system according to an embodiment of the present invention comprises: a main hydraulic pump for discharging a hydraulic fluid; a plurality of driving apparatuses operating by receiving the hydraulic fluid; a parallel flow path through which the hydraulic fluid discharged by the main hydraulic pump flows; a plurality of control spools respectively connected to the parallel flow path in parallel to control the supply of hydraulic fluid to the plurality of driving apparatuses; and a plurality of electronic proportional decompression valves for adjusting a pilot pressure, applied to the respective control spools to be proportional to a current signal which has been input, wherein, if the plurality of control spools do not operate, the hydraulic fluid discharged by the main hydraulic pump is drained into an oil tank via the parallel flow path without passing through the plurality of control spools.