Control method for topping loop

Details Control method for topping loop Control method for topping loop

1988-04-29

1989-07-11

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 3924, 60 39281, F02C 928

Patent

active

048459437

ABSTRACT:
A control system, such as for a gas turbine engine, prevents a parameter from exceeding a maximum, steady state limit using a topping loop. The topping loop compares the actual value of the parameter to a transient limit which is initially somewhat lower than the steady state limit, but can vary, at a selected rate, up to a maximum of the steady state limit. The difference between the actual value and transient limit may be used to control the system as the parameter approaches the transient limit. The transient limit, and how it varies, is selected to allow a sufficiently rapid approach of the parameter toward and up to the steady state limit, without overshooting such limit.

REFERENCES:
patent: 4040250 (1977-08-01), Saunders et al.
patent: 4188781 (1980-02-01), Johnson et al.
patent: 4337615 (1982-07-01), La Croix
patent: 4380148 (1983-04-01), Burrage et al.
patent: 4543782 (1985-10-01), Fitzmaurice

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