Control system for doser actuator

Details Control system for doser actuator Control system for doser actuator

F - Mech Eng,Light,Heat,Weapons

15

B

341/103, 341/17

F15B 9/03 (2006.01) G05D 3/18 (2006.01) G05D 3/20 (2006.01)

Patent

CA 1166718

ABSTRACT OF THE DISCLOSURE 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 correc- tion 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.

378331

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