Hydraulic Spool Valve Transition Detection Using Vibration Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic spool valves exhibit variability in dead bands due to hysteresis, making it difficult for operators to control fluid flow smoothly, as the current required to start and stop flow differs, leading to inconsistent 'feel' and control precision.
Innovation Solution
Incorporating an accelerometer in the controller to detect characteristic vibrations during opening and closing, allowing for the identification of specific electrical current values associated with these events, which are then programmed into the operator interface to provide consistent and repeatable command responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional valve control without vibration detection is used, then the system is simpler, but the dead band control precision deteriorates due to hysteresis variability
Solution Approach 1:
The system uses an accelerometer to detect characteristic vibrations generated by turbulent hydraulic fluid flow when the valve transitions between closed and open positions. This vibration feedback is sent to the controller, which identifies the electrical current values at the moment of transition and uses this information to adjust subsequent control commands, creating a closed-loop feedback system that improves dead band control precision
Solution Approach 2:
The patent replaces traditional mechanical sensing methods with an accelerometer-based vibration detection system. The accelerometer electrically senses mechanical vibrations caused by fluid turbulence during valve transitions, converting mechanical phenomena into electrical signals that can be processed by the controller to determine precise transition points
2Reliability
If distinct electrical current profiles for opening and closing are implemented, then repeatability improves, but the device complexity increases
Solution Approach 1:
The system dynamically adjusts the electrical current profiles based on the detected transition points. The controller stores separate opening and closing current profiles and selects the appropriate profile based on the valve's current state, allowing the system to adapt to hysteresis effects and improve repeatability through dynamic control rather than static settings
Solution Approach 2:
The controller pre-stores distinct electrical current profiles for valve opening and closing operations. Before actual valve operation, the system has these profiles ready and can immediately apply the appropriate profile based on the detected transition direction, enabling repeatable control without real-time calculation delays
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 enables precise control of hydraulic spool valves by using distinct electrical current profiles for opening and closing, improving repeatability and operator feedback, thus enhancing the consistency and predictability of fluid flow management.
Implementation Method 1
a characteristic vibration is generated by turbulent hydraulic fluid flow within the valve when hydraulic fluid flow is first initiated between the first and second ports
Implementation Method 2
a characteristic vibration is generated by turbulent hydraulic fluid flow within the valve
Implementation Method 3
an electromagnetic actuator, such as a solenoid, to drive movement of the valve between open and closed positions
Data Source
AI summary
The present disclosure relates to a valve assembly including a valve moveable between an open position where hydraulic fluid flow is permitted between first and second ports of the valve and a closed position where hydraulic fluid flow is blocked between the first and second ports. A characteristic vibration is generated by turbulent hydraulic fluid flow within the valve when hydraulic fluid flow is first initiated between the first and second ports as the valve moves from the closed position toward the open position. The valve assembly also includes a controller for providing electrical current to control movement of the valve via a solenoid. The controller includes an accelerometer for sensing the characteristic vibration. The controller identifies an electrical current value of the electrical current at a time when the characteristic vibration is detected.