Hydraulic Valve Modules with Mixed Compensation Strategies
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Solution Overview
Problem
Current hydraulic valve arrangements lack flexibility in controlling multiple drives during insufficient hydraulic fluid supply, as pre-compensation and post-compensation arrangements distribute fluid flow differently, affecting the operation of various drives in a system like a backhoe.
Innovation Solution
Implementing a combination of pre-compensation and post-compensation arrangements in different valve modules, where pre-compensated modules prioritize fluid supply and post-compensated modules distribute it proportionally, allowing for differentiated control of drives and energy-saving operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pre-compensation arrangement is used in all valve modules, then the control precision of each drive is improved, but the flexibility in distributing hydraulic fluid during insufficient supply deteriorates
Solution Approach 1:
The hydraulic valve arrangement is divided into multiple valve modules (2-6), where each module can be independently configured with either pre-compensation or post-compensation arrangements. This segmentation allows different control strategies to be applied to different drives simultaneously, resolving the contradiction between control precision and distribution flexibility.
Solution Approach 2:
Different valve modules are assigned different compensation arrangements based on the specific requirements of connected drives. Critical drives receiving priority fluid supply are connected to pre-compensated modules, while other drives are connected to post-compensated modules. This local differentiation optimizes both control precision and distribution flexibility.
2Adaptability or versatility
If a post-compensation arrangement is used in all valve modules, then the flexibility in distributing hydraulic fluid during insufficient supply is improved, but the control precision deteriorates
Solution Approach 1:
The system segments valve modules into different compensation types, allowing post-compensated modules to provide flexible fluid distribution while pre-compensated modules maintain control precision for critical drives.
Solution Approach 2:
Post-compensation arrangements are applied locally to valve modules serving non-critical drives, providing flexible proportional distribution, while pre-compensation arrangements are applied to modules serving critical drives requiring precise control.
3Device complexity
If multiple valve modules with the same compensation arrangement are used, then the system structure is simplified, but the control possibilities during insufficient supply deteriorate
Solution Approach 1:
The valve arrangement is segmented into multiple independently configurable valve modules, each capable of having different compensation arrangements. This modular segmentation enables differentiated control strategies without significantly increasing overall system complexity.
Solution Approach 2:
The valve modules are designed with universal functionality to accommodate both pre-compensation and post-compensation arrangements. This multi-functionality allows the same basic module design to serve different control purposes, maintaining structural simplicity while enhancing control possibilities.
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 approach ensures that critical drives like the one turning the upper vehicle body remain unaffected by insufficient supply, while other drives receive proportional fluid distribution, enhancing user comfort and operational efficiency.
Implementation Method 1
The compensation device has a throttle slide that is acted upon in the closing direction by the pressure upstream of the measuring orifice and in the opening direction by the pressure downstream of the measuring orifice
Implementation Method 2
The throttle slide in the downstream located compensation valve is acted upon in the opening direction of the pressure down-stream of the measuring orifice and in the closing direction by the highest load pressure and a spring
Data Source
AI summary
The invention concerns a hydraulic valve arrangement (1) with several valve modules (2-6), each having a supply channel arrangement with a high-pressure channel (7) and a low-pressure channel (8), a working connection arrangement with at least one working connection (A, B), a directional valve arrangement (15, 16) between the supply channel arrangement and the working connection arrangement and a compensation arrangement (19, 28). It is endeavoured to improve the control possibilities. For this purpose, it is provided that in at least one valve module (3, 5) the compensation arrangement is a pre-compensation arrangement (19) and in at least one other valve module (4, 6) the compensation arrangement is a post-compensation arrangement (28).