Adaptive pid control for chilled water crac units
AssigneeVertiv Corporation
InventorCraig A. BRUNSTETTER
Life of this patent
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Abstract
The present disclosure relates to a proportional, integral, derivative (PID) control system for controlling a cooling component of a cooling unit. The system may make use of a PID actuator position controller, a memory in communication with the PID actuator position controller, and a plurality of look-up tables. The look-up tables may be stored in the memory and may set forth different proportional “P”, integral (“I”) and derivative (“D”) gains based on an operating variable associated with operation of the cooling component of the cooling unit. The PID actuator position controller uses the lookup tables together with determination of projected data and historical data, to adjust at least one of the P, I and D gains in real time.
Claims20
A proportional, integral, derivative (PID) control system for controlling a cooling component of a cooling unit, the system including:
- a PID actuator position controller;
- a memory in communication with the PID actuator position controller;
- a plurality of look-up tables stored in the memory and setting forth different proportional “P”, integral (“I”) and derivative (“D”) gains based on an operating variable associated with operation of the cooling component of the cooling unit;
- wherein the PID actuator position controller uses the lookup tables together with determination of projected data and historical data, to adjust at least one of the P, I and D gains in real time.
A proportional, integral, derivative (PID) control system for controlling a cooling component of a cooling unit, the system including:
- a PID actuator position controller;
- a memory in communication with the PID actuator position controller;
- a plurality of look-up tables stored in the memory and setting forth different proportional “P”, integral (“I”) and derivative (“D”) gains based on an operating variable associated with operation of the cooling component of the cooling unit;
- a plurality of algorithms stored in the memory to help determine the gains to be used in controlling the cooling component;
- and
- wherein the PID actuator position controller uses the lookup tables together with a limited slope calculation, wherein the limited slope calculation defines projected behavior of the operating variable based on historical data, to determine different P, I and D gains to be used in controlling the PID actuator position controller within a plurality of different operating regions of the cooling variable.
A method for controlling a cooling component of a cooling unit, the method including:
- using a PID actuator position controller to control a proportional gain (P), an integral gain (I) and a derivative gain (D);
- using a memory to communicate with the PID actuator position controller;
- storing a plurality of look-up tables in the memory;
- using the look-up tables to hold different proportional, integral and derivative gains based on an operating variable associated with operation of the cooling component of the cooling unit;
- and
- causing the PID actuator position controller to access the lookup tables and to determine projected operating data and historical operating data for the cooling component, and to adjust at least one of the P, I and D gains for the cooling component in real time in response to evaluations of the projected and historical operating data.
Dependencies are inferred from the claim text.