Hydraulic Power Unit Pressure Control for Energy-Efficient Material Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing servo-hydraulic material testing machines operate inefficiently due to high power consumption, primarily because the hydraulic power units (HPUs) lack adaptive pressure control, leading to excessive energy usage, especially when performing material tests with pressure demands lower than the fixed output pressure.
Innovation Solution
A method and system for controlling the hydraulic power unit, which includes an electric motor and a pump, to adjust the pressure of the hydraulic fluid based on set points specific to each material test process, reducing energy consumption by optimizing the rotational speed of the motor and fluid displacement, and utilizing a controller to determine load demands and adjust the pressure set points dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the hydraulic power unit operates at fixed high pressure to ensure sufficient force for all material tests, then the material testing capability is maintained, but the energy consumption increases excessively
Solution Approach 1:
The patent implements dynamic pressure control by adjusting the hydraulic power unit's output pressure according to the specific load requirements of each material test. The controller receives test parameters and dynamically modifies pressure setpoints, allowing the system to operate at optimal pressure levels rather than maintaining fixed high pressure, thereby reducing energy consumption while maintaining adequate testing capability
Solution Approach 2:
The system changes the pressure parameter adaptively based on test configuration and predicted load demand. By modifying the pressure setpoint parameter according to actual testing requirements, the system achieves efficient energy utilization without compromising the force needed for material testing
2Reliability
If the hydraulic power unit maintains high output pressure for all test scenarios, then the system can handle maximum load requirements, but the operational efficiency decreases for lower load tests
Solution Approach 1:
The system dynamically adjusts pressure levels based on the specific test requirements. For maximum load tests, high pressure is maintained ensuring full capability, while for lower load tests, the pressure is reduced to appropriate levels, thereby improving operational efficiency without sacrificing the system's ability to handle maximum loads when needed
Solution Approach 2:
The controller uses feedback from test configuration parameters and predicted load demands to continuously optimize pressure setpoints. This feedback mechanism ensures the system operates at the most efficient pressure level for each specific test scenario while maintaining the capability to deliver maximum force when required
3Device complexity
If the hydraulic power unit uses a fixed pressure set point, then the system design is simple, but the adaptability to different material test processes is reduced
Solution Approach 1:
The pressure control system transitions from static to dynamic operation, automatically adapting pressure setpoints based on test configuration inputs. This dynamic capability provides high adaptability to different material test processes while adding only minimal control system complexity through automated parameter adjustment
Data Source
AI summary
According to an embodiment of the present disclosure, there is provided a method of controlling a hydraulic power unit, HPU, for providing a pressurised hydraulic fluid to a material testing apparatus, the HPU having an electric motor and a pump, the method comprising: controlling a pressure of the pressurised hydraulic fluid based on a first pressure set point for performing a first material test process; receiving an indication of a second pressure set point for a second material test process to be performed by the material testing apparatus; and controlling the pressure of the pressurised hydraulic fluid based on the second pressure set point for performing the second material test process.