Centrifuge Pump Control for Rotor Stability in Engine Lubrication
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Solution Overview
Problem
Internal combustion engines with centrifuges experience instability and increased wear due to abrupt pressure drops when the centrifuge pump is shut down, leading to rotor wobbling and severe vibrations.
Innovation Solution
Implementing an open-loop or closed-loop control device to gradually change the setpoint value of the centrifuge pump upon shutdown or startup, allowing for a controlled transition to prevent pressure peaks and maintain rotor stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the centrifuge pump is shut down abruptly, then the shutdown time is reduced, but the rotor stability deteriorates and severe vibrations occur
Solution Approach 1:
The centrifuge pump's operation is made dynamically adjustable through controlled variation of its operating parameters. The control device gradually reduces the pump's speed or flow rate during shutdown, and gradually increases it during startup, rather than switching abruptly between on and off states. This dynamic adjustment prevents sudden pressure changes that would cause rotor instability and vibrations, while still achieving relatively quick shutdown and startup compared to traditional gradual methods.
Solution Approach 2:
The invention changes the operational parameters of the centrifuge pump from binary (on/off) to continuous variable control. By adjusting parameters such as pump speed, flow rate, or pressure in a controlled manner during transition phases, the system maintains adequate lubrication pressure to the centrifuge rotor throughout the shutdown and startup processes, preventing rotor instability and mechanical damage while minimizing the time lost during transitions.
2Ease of operation
If the centrifuge pump is shut down abruptly, then the shutdown operation is simplified, but lubrication adequacy deteriorates
Solution Approach 1:
The control device automatically manages the gradual shutdown and startup sequences without requiring manual intervention or complex operator procedures. The system self-regulates the pump's operation during transition phases, maintaining adequate lubrication pressure through automated parameter adjustment. This keeps the operation simple from the user perspective while ensuring reliable lubrication throughout the process.
3Loss of time
If the centrifuge pump is started abruptly, then the startup time is reduced, but pressure peaks occur causing damage
Solution Approach 1:
The pump startup process is made dynamic and controlled rather than abrupt. The control device gradually increases the pump's speed or flow rate during startup, allowing the system pressure to rise progressively rather than experiencing sudden peaks. This prevents mechanical damage to the centrifuge and its bearings while still achieving relatively quick startup compared to traditional gradual methods.
Solution Approach 2:
The control device prepares the system for startup by gradually building pressure before full pump operation begins. This preliminary gradual pressurization cushions against sudden pressure peaks that would occur with abrupt startup, protecting the centrifuge rotor and bearings from mechanical shock and damage while minimizing the overall startup time.
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 solution reduces rotor instability and wear by gradually adjusting the centrifuge pump's operation, ensuring continuous lubrication and preventing damage during shutdown and startup processes.
Implementation Method 1
a lubricant volumetric flow directed into the at least one centrifuge produces and/or maintains a rotational movement of the at least one centrifuge
Implementation Method 2
separating foreign particles in a lubricant, which are present in the lubricant in large amounts, more specifically in dependence on the difference in density between the medium and the particles
Implementation Method 3
the centrifuge to be of a self-lubricated design, that is to say, the lubricant to be centrifuged is also used for lubricating the centrifuge rotor
Data Source
AI summary
An internal combustion engine includes a centrifuge, a centrifuge pump, and a controller. The centrifuge is configured to separate foreign particles from a lubricant, wherein the centrifuge is so designed that a lubricant volumetric flow directed into the centrifuge produces and/or maintains a rotational movement of the centrifuge. The centrifuge pump is configured to produce and/or increase the lubricant volumetric flow directed into the centrifuge. A controller is configured to provide control of the centrifuge pump according to a setpoint value for a kinematic operating parameter and/or for a setting parameter of the centrifuge pump. The controller is configured to gradually change the setpoint value for control of the centrifuge pump upon shutdown or starting of the centrifuge pump.