Control system for doser actuator

Details Control system for doser actuator Control system for doser actuator

1980-10-27

1983-06-07

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91417R, 91457, F15B 1316

Patent

active

043865534

ABSTRACT:
A control system 54 for a doser type hydraulic actuator 56 is disclosed. The doser actuator includes a pair of unequal area pistons 18, 20 on a common shaft 16 which are moved incrementally by injecting into or removing from a control pressure chamber metered quantities or doses of fluid. The doses are metered by timed openings of solenoid valves 32, 34 connecting the control pressure chambered to a supply 44 or return 48 pressure sources. The control system includes a base pulse width signal generator 106 which pulse modulates the solenoids as a function of the error between a requested position and an actual position. The base pulse width is modified by a correction means 108, 110, 112 when the error is within a predetermined band width. The correcting means compensates for the reaction of the actuator when its response is uncertain with respect to the base pulse width.

REFERENCES:
patent: 3266378 (1966-08-01), Show
patent: 3295421 (1967-01-01), McCormick
patent: 3618469 (1971-11-01), Willis et al.
patent: 3763744 (1973-10-01), Fornell et al.
patent: 4007361 (1977-02-01), Martin
patent: 4077738 (1978-03-01), Keely et al.
patent: 4256017 (1981-03-01), Eastman
"Analysis and Digital Output Interface Devices for Gas Turbine Electronic Controls"--Final Report D. M. Newirth and E. W. Koeing NASA Report NAS CR 135135.

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