Hydraulic Accumulator Speed Control for Stable Actuator Motion
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Solution Overview
Problem
Hydraulic systems face uncontrollable and undesirable behavior, such as abrupt speed reduction, when the pressure accumulator is exhausted, limiting the continuous operation of actuators due to a predetermined maximum amount of hydraulic fluid storage.
Innovation Solution
A hydraulic control system that includes a pressure line, pump, actuator, valve device, electronic control unit, pressure accumulator, and sensor devices, where the electronic control unit limits the actuator's speed based on the amount and pressure of hydraulic fluid in the accumulator, ensuring maximum energy utilization and preventing abrupt speed changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a predetermined maximum amount of hydraulic fluid is stored in the pressure accumulator, then the system can operate with limited energy storage capacity, but the actuator movement cannot be maintained indefinitely and the pressure accumulator will be exhausted causing abrupt reduction in actuator speed
Solution Approach 1:
The control system dynamically adjusts the maximum speed of the actuator based on the current amount of hydraulic fluid in the pressure accumulator. As the fluid amount decreases, the system automatically reduces the permitted speed to extend operation duration. This dynamic adaptation resolves the contradiction by making the operating parameters flexible rather than fixed.
Solution Approach 2:
The system employs a control unit that continuously monitors the amount of hydraulic fluid in the pressure accumulator and uses this feedback information to adjust the maximum speed setting. This closed-loop feedback mechanism ensures that the actuator speed is always appropriate for the available energy storage, preventing exhaustion and maintaining optimal operation throughout the fluid depletion process.
2Productivity
If the actuator speed is increased to improve productivity, then the system can perform work faster, but the pressure accumulator exhausts more quickly causing uncontrollable behavior and abrupt speed reduction
Solution Approach 1:
The system dynamically adjusts the maximum speed parameter based on the energy storage state. When the pressure accumulator is well-filled, higher speeds are permitted for maximum productivity. As the fluid amount decreases, the system automatically lowers the speed limit to maintain reliable, controlled operation. This dynamic parameter adjustment resolves the contradiction between speed and stability.
Solution Approach 2:
The control unit changes the operational parameters (maximum speed) based on the changing state of the system (amount of hydraulic fluid). By adapting the speed parameter to the available energy, the system maintains both high productivity when possible and reliable control throughout the entire operation cycle, preventing the abrupt behavior that would occur without parameter adaptation.
3Duration of action of moving object
If the pressure accumulator is designed to store more hydraulic fluid to extend operation duration, then the system can maintain actuator movement longer, but the system complexity and size increase
Solution Approach 1:
Instead of designing for a fixed maximum duration with a large accumulator, the system uses dynamic speed adjustment to extend operational flexibility. The same accumulator size can support variable operation durations by adapting the speed parameter, eliminating the need for oversized energy storage components while achieving extended effective operation through intelligent control.
Solution Approach 2:
The system changes the operational parameters (speed, flow rate) to optimize performance for different operating conditions rather than relying on fixed hardware configurations. This parameter-based approach allows the same physical system to achieve extended operation duration through control strategies rather than through increased system size or complexity.
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 effectively manages energy storage and usage, maintaining controlled actuator speed by adjusting it according to the available hydraulic fluid and pressure, preventing abrupt deceleration and optimizing energy use in applications like cranes and load-moving machines.
Implementation Method 1
a pressure accumulator connected to the pressure line from which the pressure accumulator may receive pressurized hydraulic fluid and to which the pressure accumulator may, simultaneously with a pump, supply pressurized hydraulic fluid for running the actuator
Data Source
AI summary
A hydraulic system including: a pressure line; a pump; an actuator; a valve device configured to control the flow of pressurized hydraulic fluid to the actuator; an electronic control unit configured to control the valve device by a control signal proportional to the desired speed of the actuator at any given time; a pressure accumulator capable of supplying, together with the pump, pressurized hydraulic fluid for moving the actuator; a sensor device configured to measure, directly or indirectly, the amount of pressurized hydraulic fluid in the pressure accumulator at any given time; setting devices configured to set a setting signal to be proportional with the desired speed of the actuator at any given time. The electronic control unit is configured to restrict the targeted speed of the actuator not to exceed a predetermined maximum speed which is proportional to the amount of pressurized hydraulic fluid in the pressure accumulator.