Hydraulic Actuator Flow Control for Over-Center Transitions
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Solution Overview
Problem
Mobile hydraulic systems face challenges in efficiently managing energy and maintaining stability during over-center transitions, where the force of gravity's assistance or resistance to load movement changes, leading to potential instability and energy wastage.
Innovation Solution
A control unit utilizing a combination of accelerometer, magnetometer, and gyroscope sensors anticipates over-center transitions by analyzing position and motion data, adjusting metered flow through hydraulic actuators to prevent pressure oscillations and maintain stability, thereby minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hydraulic flow is continuously metered to maintain stability during over-center transitions, then system stability is improved, but energy consumption increases
Solution Approach 1:
The control unit anticipates over-center transitions by monitoring load position and motion parameters before the transition occurs, allowing hydraulic flow adjustments to be made in advance. This preliminary action enables the system to prepare for stability changes without continuous metering, reducing energy consumption while maintaining stability during the transition
Solution Approach 2:
The system uses sensor data from the load and equipment to provide feedback to the control unit, which continuously monitors position and motion parameters. This feedback mechanism allows the system to detect approaching over-center conditions and adjust hydraulic flow dynamically, achieving stability only when needed rather than continuous metering
2Use of energy by moving object
If hydraulic flow is reduced during over-center transitions, then energy consumption decreases, but system stability deteriorates
Solution Approach 1:
By anticipating the over-center transition before it occurs, the control unit can maintain adequate hydraulic flow in advance of the transition point. This ensures stability is preserved during the critical transition period while allowing flow reduction to occur only after the transition is complete, minimizing energy consumption without sacrificing stability when needed
3Measurement precision
If sensor data processing is performed continuously, then transition detection accuracy is improved, but computational load and response time increase
Solution Approach 1:
The control unit performs full sensor data processing only when the load approaches conditions indicating an impending over-center transition. During normal operation, processing is reduced or suspended. This partial action approach maintains high detection accuracy when needed while minimizing computational load and response time during routine operations
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 solution effectively anticipates and manages over-center transitions, reducing energy wastage and maintaining system stability by adjusting hydraulic flow only when necessary, using sensor data to predict transitions and optimize metered pressure.
Implementation Method 1
The accelerometer is adapted to measure acceleration due to gravity or a hydraulic force
Implementation Method 2
The magnetometer is adapted to measure a magnetic field strength, such as Earth's characteristic magnetic field
Implementation Method 3
The gyroscope is adapted to measure yaw, pitch, and roll rates
Data Source
AI summary
A mobile hydraulic system includes a hydraulic actuator coupled to a load, and a control unit coupled to the load and/or to the hydraulic actuator. The control unit is adapted to anticipate an over-center transition of the load relative to a gravity vector prior to the over-center transition through the use of sensors configured with accelerometers, gyroscopes and magnetometers. In some examples, the over-center transition is from an overrunning driving of the load to a passive driving of the load. In some examples, the over-center transition is from a passive driving of the load to an overrunning driving of the load. In some examples, the control unit is adapted to control change in a metered flow through one or more ports of the associated actuator to minimize and/or prevent one or more hydraulic effects of the anticipated over-center transition. In some examples, the control unit controls the metered flow by causing one or more actuators (e.g., a solenoid) to shift one or more valve positions to change the flow through one or more ports of the associated actuator.