Parallel Pilot Valves With Different Overlaps for Disturbance Robustness
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Solution Overview
Problem
Existing hydraulic systems with pilot-operated pressure control valves exhibit low robustness against disturbances such as contamination, jamming, vibrations, and changes in friction coefficients, leading to undesirable disruptions in hydraulic function.
Innovation Solution
A hydraulic system with at least two pilot-operated pressure control valves connected in parallel, featuring different valve overlaps and configurations to enhance robustness, allowing one valve to compensate for the failure of the other, ensuring continuous operation even if one valve becomes stuck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pressure control valves with identical characteristics are used, then manufacturing complexity is reduced, but robustness against disturbances deteriorates
Solution Approach 1:
The patent applies local quality by assigning different valve overlaps to different pressure control valves. Specifically, the first pressure control valve has a first valve overlap while the second pressure control valve has a second valve overlap that differs from the first. This creates local differentiation in the redundant valves, making them respond differently to disturbances and reducing the likelihood that both valves will fail simultaneously due to the same disturbance.
Solution Approach 2:
The patent implements parameter changes by varying the valve overlap parameter between different pressure control valves. The first valve overlap and second valve overlap are deliberately made different, which changes the flow characteristics and response behavior of each valve. This parameter differentiation enhances robustness against disturbances while maintaining relatively simple manufacturing processes.
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 system achieves high robustness against disturbances and operational costs, allowing one to maintain continuous operation even if one valve becomes stuck, the other pressure control valves can still fulfill most of the functional requirements of the hydraulic system.
Implementation Method 1
Each pressure control valve has at least one valve spool, which is guided longitudinally within valve bodies... A high-pressure line is connected to the high-pressure valve pockets, a working-pressure line to the working-pressure valve pockets, and a low-pressure line to the low-pressure valve pockets of the pressure control valves
Data Source
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AI summary
The invention relates to a hydraulic system (1) with at least two pressure-regulating pilot valves (2, 3) in a parallel circuit in order to set a working pressure (p_A). Each of the pressure-regulating valves (2, 3) has a valve slide (2A, 3A), each of which is guided in valve housings (2B, 3B) in a longitudinally movable manner. A high-pressure line (5) is connected to a respective high-pressure valve pocket (2B1, 3B1), a working pressure line (4) is connected to a respective working-pressure valve pocket (2B2, 3B2), and a low-pressure line (6) is connected to a respective low-pressure valve pocket (2B3, 3B3) of the pressure-regulating valves (2, 3). The pressure-regulating valves (2, 3) are designed with different valve laps (Udk2, Udk3).