Adaptive self-correcting control system

Patent · Tue Jan 03 00:00:00 EST 1984

OSTI ID:6870897

Ellis, S H

A control system for regulating a controlled device or process, such as a turbofan engine, produces independent multiple estimates of one or more controlled variables of the device or process by combining the signals from a plurality of feedback sensors, which provide information related to the controlled variables, in weighted nonordered pairs. The independent multiple estimates of each controlled variable are combined into a weighted average, and individual estimates which differ by more than a specified amount from the weighted average are edited and temporarily removed from consideration. A revised weighted average value of each controlled variable is then produced, and this value is used to limit or control operation of the device or process. Adaptive trim is provided to compensate for changes in the device or process being controlled, such as engine deterioration, by slowly trimming each individual estimate toward the mean, and includes error compensation which constrains the weighted sum of the adaptive trims to equal zero, thereby preventing the adaptive trim from changing the operating level of the device or process. A secondary editing circuit based on a majority rule principle identifies a failed feedback sensor and permanently excludes all individual estimates of the controlled variable based on the failed sensor. Editing boundaries are increased and adaptive trim rate is varied when a transient occurs in the operation of the device or process. Further transient compensation may be required for a system with more severe transient requirements, and this invention includes compensation to selected feedback parameters such as turbine temperature to account for differences between steady state and transient values.

• Assignee: United Technologies Corp., Hartford, CT
• Patent Number(s): US 4423594
• OSTI ID: 6870897
• Resource Relation: Patent File Date: Filed date 1 Jun 1981; Other Information: PAT-APPL-269196
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPUTERIZED CONTROL SYSTEMS
CORRECTIONS
DESIGN
OPERATION
ELECTRONIC CIRCUITS
ERRORS
FEEDBACK
INTERNAL COMBUSTION ENGINES
MULTI-CHANNEL ANALYZERS
MULTI-PARAMETER ANALYSIS
PROCESS CONTROL
SIGNALS
TEXT EDITORS
TURBINES
WEIGHTING FUNCTIONS
CONTROL
CONTROL SYSTEMS
ELECTRONIC EQUIPMENT
ENGINES
EQUIPMENT
FUNCTIONS
HEAT ENGINES
MACHINERY
PULSE ANALYZERS
TURBOMACHINERY
420800* - Engineering- Electronic Circuits & Devices- (-1989)