Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1989-01-23
1990-10-30
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91529, 91536, 13759615, F15B 1306
Patent
active
049660659
ABSTRACT:
A time multiplexed hydraulic control system in which a multiple section dog valve is multiplexed among a plurality of channels. An electrical actuator on the dog valve controls pilot means. The pilot means is associated with a plurality of followers, one for each channel, and each follower controls the flow rate through an associated output port. Multiplexing means in the dog valve sequentially supplies fluid to the pilot means for sequentially positioning then locking the respective followers. Thus, each channel has continuous hydraulic flow based on the position of its dedicated follower, with the followers being repositioned on a multiplexed basis in associated time slots.
REFERENCES:
patent: 3645141 (1972-02-01), Moore et al.
patent: 4191215 (1980-03-01), Gonner
patent: 4271867 (1981-06-01), Milberger et al.
patent: 4325127 (1982-04-01), Major
patent: 4664136 (1987-05-01), Everett
patent: 4838145 (1989-06-01), Slocum et al.
patent: 4860145 (1989-08-01), Hosono et al.
"Imagine . . . A Self-Calibrating Pressure Transducer" advertisment for Scanivalve Corp., San Diego, Calif.
"Metering Valve W/Regulator" article, Tech Data South Bend Controls Inc. Bulletin, PV-210, SBC, 6/1987.
"Metering Valve" article, Tech Data South Bend Controls Inc. Bulletin, PV-211, SBC, 6/1987.
Article entitled "Actuator Accepts Electrical Digital Control Signals Directly--Eliminates Digital-To-Analog Converters", 4/1989.
Garrett Robert E.
Kapsalas George
Woodward Governor Company
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