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US 12,214,116 B2Granted
Methods and systems for providing control stability in a vacuum generation system using cascade proportional-integral-derivative (PID) controller
AssigneeAlcon Inc.
InventorBrian T. Chiem
Life of this patent
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Abstract
Certain embodiments provide a vacuum generation system with a cascade PID controller, a proportional valve, and a vacuum generator. The cascade PID controller allows the vacuum generation system to control the operating range of supply air pressure that is provided to the vacuum generator. By controlling the operating range of the supply air pressure, the vacuum generation system is able to avoid entering the decreasing or non-monotonic region of the vacuum generator.
Claims15
A method of controlling vacuum pressure in a vacuum generation system, the method comprising:
- receiving a vacuum pressure sensor reading from a vacuum pressure sensor;
- calculating a first error between the vacuum pressure sensor reading and a vacuum pressure set point;
- calculating a supply air pressure set point based on the first error;
- receiving a supply air pressure sensor reading from a supply air pressure sensor;
- calculating a second error between the supply air pressure sensor reading and the supply air pressure set point;
- calculating a voltage level for controlling a proportional valve based on the second error;
- providing the voltage level to the proportional valve;
- causing, using the proportional valve, supply air pressure to be provided to a vacuum generator based on the voltage level;
- and
- providing, using the vacuum generator, vacuum pressure based on the supply air pressure to a surgical tool.
7 more elements
A vacuum generation system, comprising:
- a first proportional-integral-derivative (PID) controller, configured to:
- receive a first error between a vacuum pressure sensor reading associated with a vacuum generator and a vacuum pressure set point;
- calculate a supply air pressure set point based on the first error;
- a second PID controller, configured to:
- receive a second error between a supply air pressure sensor reading and the supply air pressure set point;
- calculate a voltage level based on the second error;
- the proportional valve, configured to:
- receive the voltage level;
- cause supply air pressure to be provided to a vacuum generator based on the voltage level;
- the vacuum generator, configured to:
- provide vacuum pressure based on the supply air pressure to a surgical tool.
8 more elements
A vacuum generation system, comprising:
- a memory comprising executable instructions;
- a processor in data communication with memory and configured to execute the instructions, which configured the processor to;
- receive a first error between a vacuum pressure sensor reading associated with a vacuum generator and a vacuum pressure set point;
- calculate a supply air pressure set point based on the first error;
- receive a second error between a supply air pressure sensor reading and the supply air pressure set point;
- calculate a voltage level based on the second error;
- cause the voltage level to be provided to the proportional valve;
- the proportional valve, configured to:
- cause supply air pressure to be provided to a vacuum generator based on the voltage level;
- the vacuum generator, configured to:
- provide vacuum pressure based on the supply air pressure to a surgical tool.
8 more elements
Dependencies are inferred from the claim text.