Directional valve double spool control technology
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The traditional directional control valve regulates the flow of fluid through a spool, with the relationship between the two ports determined during the design and manufacturing phase. This fixed configuration prevents any adjustment during operation, resulting in limited independent control over the flow or pressure at each port. However, with the declining cost of microprocessors and sensors, along with continuous advancements in control technology, double-spool control has become increasingly viable in construction machinery. Utronics, a UK-based company, has developed its own patented double-spool valve technology, which is now widely used in excavators, trucks, loaders, and backhoe loaders from major brands like JCB, Deere, DAWOO, and CASE.
To meet the growing demand for advanced hydraulic systems in China, Utronics has introduced its technology into the Chinese market. It has successfully completed the prototype debugging of the Xiaogang (5t) loader and the Zhanyang (8t) excavator, entering the pilot testing phase. The key advantages of double-spool valves over traditional single-spool valves include:
1. **Elimination of System Instability**
Traditional single-spool valves often require additional components like speed or pressure control valves to improve stability, which can reduce efficiency and increase system complexity. In contrast, double-spool valves allow for independent control of both sides of an actuator, eliminating the need for these extra components and improving overall performance.
2. **Flexibility in Functionality**
With traditional valves, users must purchase specific hydraulic components for different functions, leading to high costs and inefficiency. Double-spool valves enable software-driven control, allowing manufacturers to offer customizable features without increasing hardware complexity.
3. **Energy Efficiency and Performance**
Traditional systems struggle to manage backpressure effectively, causing increased energy consumption and heat. Double-spool valves provide precise control over both inlet and outlet pressures, optimizing energy use and enhancing system reliability.
4. **Two Basic Control Strategies**
- **Load Direction Remains Constant**: For applications like crane luffing cylinders, where the load direction doesn’t change, one spool can be used for pressure control while the other manages flow, reducing the need for balance valves and improving stability.
- **Load Direction Changes During Operation**: In such cases, the system uses pressure control on the rod side and flow control on the rodless side, with a PI controller ensuring smooth transitions and maintaining system integrity.
5. **Utronics Hydraulic Control System**
Utronics integrates CAN bus communication with dual-spool technology, enabling precise, flexible, and efficient control. The system includes a joystick, ECU, regulating valve, double-spool valve, and external sensors. The ECU processes inputs and controls the valves via embedded software, allowing for real-time adjustments and complex function coordination.
6. **Advantages of Utronics Technology**
The system’s closed-loop control, sensor integration, and modular design make it highly adaptable. It supports advanced features such as engine-hydraulic synchronization, job-specific functions, and improved operator comfort. Its low cost, ease of maintenance, and compatibility with various machines position it as a game-changer in the construction equipment industry.
In conclusion, Utronics’ electronic hydraulic control system offers unmatched versatility, precision, and efficiency, setting a new standard for modern construction machinery.