Control system topping loop

Details Control system topping loop Control system topping loop

1989-01-23

1989-12-05

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

F02C 900

Patent

active

048843970

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), LaCroix
patent: 4380148 (1983-04-01), Burrage et al.
patent: 4543782 (1985-10-01), Fitzmaurice

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