( 31641 of 31641 ) |
United States Patent | 3,554,084 |
Rasmussen , et al. | January 12, 1971 |
The servosystem which will tolerate failure in two of its four redundant channels and still be operational consists of four identical redundant units. The force outputs of the four redundant units are summed together, by means of a summing link or member, with the resultant force on the member being applied to a control valve of a fluid operated motor which is a low resistive load. The input signal to each redundant unit is an electrical signal which energizes a torque motor. The torque motor responds by developing a force on its armature, which force is transmitted to a jet pipe valve. The jet pipe is deflected thereby causing a fluid pressure differential at the receiving holes coacting with the jet pipe nozzle. This pressure differential is transmitted to both a mod piston (which is the drive piston of the redundant unit) and the pressure sensor piston in parallel with the mod piston. The motion of both pistons is force fed back to the jet pipe by means of yieldable, impositive members as flat springs, thus closing two independent loops.
Inventors: | Rasmussen; Robert F. (Brooklyn Center, MN), Taylor; John C. (Golden Valley, MN) |
Assignee: |
Honeywell Inc.
(Minneapolis,
MN)
|
Appl. No.: | 04/683,994 |
Filed: | November 17, 1967 |
Current U.S. Class: | 91/3 ; 91/387; 91/433; 91/448; 91/509; 91/510 |
Current International Class: | F15B 9/00 (20060101); F15B 18/00 (20060101); G05D 1/00 (20060101); F15b 013/02 (); F15b 013/16 () |
Field of Search: | 91/3,387(Cursory),363A,388,(Cursory),411,446,448,(Cursory),384,(Cursory) |
2947286 | August 1960 | Baltus et al. |
3171329 | March 1965 | Rasmussen |
3190185 | June 1965 | Rasmussen |
3270623 | September 1966 | Garnjost et al. |
3272062 | September 1966 | Flippo et al. |