US5004084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed loop control of a hydraulically controlled clutch
Assignee: Sundstrand Corp
•
Filing: 1989-05-24
•
Granted: 1991-04-02
•
Expires: 2009-05-24
Abstract
Abstract A control system (100) for a hydraulically controlled clutch (18) for coupling a source of rotary power (12) to a load (102) for accelerating the load from a first velocity to a second velocity within a time measured from a beginning of the acceleration and ending between first and second times measured from the beginning of acceleration with the load being variable during acceleration of the load from the first velocity to the second velocity in accordance with the invention includes a source of pressurized hydraulic fluid (38), a servo valve (42), having an inlet coupled to the source of pressurized fluid and an outlet coupled to the hydraulically controlled clutch, the servo valve being responsive to a control signal to vary the pressure of hydraulic fluid applied to the hydraulically controlled clutch to vary the coupling between the source of rotary power and an output shaft (22) which is coupled to the load, a speed sensor (112) for producing a speed signal proportional to the speed of the output shaft; a stored program (108) controlling a programmed acceleration of the load from the first velocity to the second velocity within a time interval measured from the beginning of the acceleration and ending between the first and second times; a controller (110), responsive to the stored program and the speed signal, for producing the control signal which is a function of a difference (E) between the velocity signal and a velocity controlled by the stored program.
Inventors
- 👤 Kourosh Mehr-Ayin
- 👤 Paul A. Schuh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:54
CPC Classifications
F; F16; F16D; F16D48/00; F16D48/06; F16D48/066; F16D2500/00; F16D2500/10; F16D2500/102; F16D2500/1026; F16D2500/30; F16D2500/304; F16D2500/3042; F16D2500/30426; F16D2500/316; F16D2500/3166; F16D2500/70; F16D2500/702; F16D2500/70252; F16D2500/704; F16D2500/70402; F16D2500/70406; F16D2500/706; F16D2500/70605; F16D2500/7061
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
246 words
A control system for a hydraulically controlled clutch for coupling a source of rotary power to a load for accelerating the load from a first velocity to a second velocity within a time measured from a beginning of the acceleration and ending between first and second times measured from the beginning of acceleration with the load being variable during the acceleration of the load from the first velocity to the second velocity comprising: a source of pressurized hydraulic fluid; a servo valve, having an inlet coupled to the source of pressurized fluid and an outlet coupled to the hydraulically controlled clutch, the servo valve being responsive to a control signal to vary the pressure of hydraulic fluid applied to the hydraulically controlled clutch to vary the coupling between the source of rotary power and an output shaft which is coupled to the load; a sensor for producing a velocity signal proportional to the velocity of the output shaft; a stored program controlling a programmed acceleration of the load from the first velocity to the second velocity within a time interval measured from the beginning of the acceleration and ending between the first and second times; and a controller, responsive to the stored program and the velocity signal, for producing the control signal which is a function of a difference between the velocity signal and a desired velocity of the output shaft during acceleration from the first velocity to the second velocity produced by the stored program.
Claim 2
Dependent Claim
246 words
A control system for a hydraulically controlled clutch for coupling a source of rotary power to a load for accelerating the load from a first velocity to a second velocity within a time measured from a beginning of the acceleration and ending between first and second times measured from the beginning of acceleration with the load being variable during the acceleration of the load from the first velocity to the second velocity comprising: a source of pressurized hydraulic fluid; a servo valve, having an inlet coupled to the source of pressurized fluid and an outlet coupled to the hydraulically controlled clutch, the servo valve being responsive to a control signal to vary the pressure of hydraulic fluid applied to the hydraulically controlled clutch to vary the coupling between the source of rotary power and an output shaft which is coupled to the load; a sensor for producing a velocity signal proportional to the velocity of the output shaft; a stored program controlling a programmed acceleration of the load from the first velocity to the second velocity within a time interval measured from the beginning of the acceleration and ending between the first and second times; and a controller, responsive to the stored program and the velocity signal, for producing the control signal which is a function of a difference between the velocity signal and a desired velocity of the output shaft during acceleration from the first velocity to the second velocity produced by the stored program.
Claim 3
Dependent Claim
42 words
A control system in accordance with claim 1 wherein: the controller is a proportional and differential controller and the control signal is proportional to and a differential of a difference between the velocity signal and the desired velocity controlled by the program.
Claim 4
Dependent Claim
71 words
A control system in accordance with claim 1 wherein: the controller is a proportional, integral and differential controller and the control signal is proportional to a difference between the velocity signal and the desired velocity determined by the controller by integrating a set acceleration specified by the stored program; and the stored program is a single value of acceleration for accelerating the load from the first velocity to the second velocity.
Claim 5
Dependent Claim
37 words
A control system in accordance with claim 2 wherein: the stored program is a series of velocity values which are read out synchronously during the accelerating of the load from the first velocity to the second velocity.
Claim 6
Dependent Claim
32 words
A control system in accordance with claim 1 wherein the load comprises: a gearbox driving at least a first load which is variable during the acceleration between the first and second velocities.
Claim 7
Dependent Claim
16 words
A control system in accordance with claim 5 wherein the first load comprises: a hydraulic pump.
Claim 8
Dependent Claim
15 words
A control system in accordance with claim 5 wherein the first load comprises: a generator.
Claim 9
Dependent Claim
36 words
A control system in accordance with claim 1 wherein the load comprises: a gearbox driving at least a first load and a second load which are variable during the acceleration between the first and second velocities.
Claim 10
Dependent Claim
23 words
A control system in accordance with claim 8 wherein: the first load is a hydraulic pump; and the second load is a generator.
Claim 11
Dependent Claim
32 words
A control system in accordance with claim 2 wherein the load comprises: a gearbox driving at least a first load which is variable during the acceleration between the first and second velocities.
Claim 12
Dependent Claim
16 words
A control system in accordance with claim 10 wherein the first load comprises: a hydraulic pump.
Claim 13
Dependent Claim
15 words
A control system in accordance with claim 10 wherein the first load comprises: a generator.
Claim 14
Dependent Claim
36 words
A control system in accordance with claim 2 wherein the load comprises: a gearbox driving at least a first load and a second load which are variable during the acceleration between the first and second velocities.
Claim 15
Dependent Claim
23 words
A control system in accordance with claim 13 wherein: the first load is a hydraulic pump; and the second load is a generator.
Claim 16
Dependent Claim
32 words
A control system in accordance with claim 3 wherein the load comprises: a gearbox driving at least a first load which is variable during the acceleration between the first and second velocities.
Claim 17
Dependent Claim
16 words
A control system in accordance with claim 15 wherein the first load comprises: a hydraulic pump.
Claim 18
Dependent Claim
15 words
A control system in accordance with claim 15 wherein the first load comprises: a generator.
Claim 19
Dependent Claim
36 words
A control system in accordance with claim 3 wherein the load comprises: a gearbox driving at least a first load and a second load which are variable during the acceleration between the first and second velocities.
Claim 20
Dependent Claim
23 words
A control system in accordance with claim 18 wherein: the first load is a hydraulic pump; and the second load is a generator.
Claim 21
Dependent Claim
32 words
A control system in accordance with claim 4 wherein the load comprises: a gearbox driving at least a first load which is variable during the acceleration between the first and second velocities.
Claim 22
Dependent Claim
16 words
A control system in accordance with claim 20 wherein the first load comprises: a hydraulic pump.
Claim 23
Dependent Claim
15 words
A control system in accordance with claim 20 wherein the first load comprises: a generator.
Claim 24
Dependent Claim
36 words
A control system in accordance with claim 4 wherein the load comprises: a gearbox driving at least a first load and a second load which are variable during the acceleration between the first and second velocities.
Claim 25
Dependent Claim
23 words
A control system in accordance with claim 23 wherein: the first load is a hydraulic pump; and the second load is a generator.
Claim 26
Dependent Claim
18 words
A control system in accordance with claim 1 wherein: the source of rotary power is variable in velocity.
Claim 27
Dependent Claim
18 words
A control system in accordance with claim 2 wherein: the source of rotary power is variable in velocity.
Claim 28
Dependent Claim
18 words
A control system in accordance with claim 3 wherein: the source of rotary power is variable in velocity.
Claim 29
Dependent Claim
18 words
A control system in accordance with claim 4 wherein: the source of rotary power is variable in velocity.
Claim 30
Dependent Claim
18 words
A control system in accordance with claim 5 wherein: the source of rotary power is variable in velocity.
Claim 31
Dependent Claim
18 words
A control system in accordance with claim 6 wherein: the source of rotary power is variable in velocity.
Claim 32
Dependent Claim
18 words
A control system in accordance with claim 7 wherein: the source of rotary power is variable in velocity.
Claim 33
Dependent Claim
18 words
A control system in accordance with claim 8 wherein: the source of rotary power is variable in velocity.
Claim 34
Dependent Claim
18 words
A control system in accordance with claim 9 wherein: the source of rotary power is variable in velocity.
Claim 35
Dependent Claim
253 words
A control system for a hydraulically controlled clutch for coupling a source of rotary power to a load disposed in an airframe for accelerating the load from a first velocity to a second velocity within a time measured from a beginning of the acceleration and ending between first and second times measured from the beginning of acceleration with the load being variable during the acceleration of the load from the first velocity to the second velocity comprising: a source of pressurized hydraulic fluid; a servo valve, having an inlet coupled to the source of pressurized fluid and an outlet coupled to the hydraulically controlled clutch, the servo valve being responsive to a control signal to vary the pressure of hydraulic fluid applied to the hydraulically controlled clutch to vary the coupling between the source of rotary power and an output shaft which is coupled to the load; a sensor for producing a velocity signal proportional to the velocity of the output shaft; a stored program storing data which specifies a programmed acceleration of the load from the first velocity to the second velocity within a time interval measured from the beginning of the acceleration and ending between the first and second times; and a controller, responsive to the stored program and the velocity signal, for producing the control signal which is a function of a difference between the velocity signal and a desired velocity of the output shaft during acceleration from the first velocity to the second velocity produced by the stored program.
Claim 36
Dependent Claim
253 words
A control system for a hydraulically controlled clutch for coupling a source of rotary power to a load disposed in an airframe for accelerating the load from a first velocity to a second velocity within a time measured from a beginning of the acceleration and ending between first and second times measured from the beginning of acceleration with the load being variable during the acceleration of the load from the first velocity to the second velocity comprising: a source of pressurized hydraulic fluid; a servo valve, having an inlet coupled to the source of pressurized fluid and an outlet coupled to the hydraulically controlled clutch, the servo valve being responsive to a control signal to vary the pressure of hydraulic fluid applied to the hydraulically controlled clutch to vary the coupling between the source of rotary power and an output shaft which is coupled to the load; a sensor for producing a velocity signal proportional to the velocity of the output shaft; a stored program storing data which specifies a programmed acceleration of the load from the first velocity to the second velocity within a time interval measured from the beginning of the acceleration and ending between the first and second times; and a controller, responsive to the stored program and the velocity signal, for producing the control signal which is a function of a difference between the velocity signal and a desired velocity of the output shaft during acceleration from the first velocity to the second velocity produced by the stored program.
Claim 37
Dependent Claim
14 words
A control system in accordance with claim 34 wherein: the load is an APU.
Claim 38
Dependent Claim
26 words
A control system in accordance with claim 35 wherein: the APU comprises a gearbox which drives at least one of a hydraulic pump and a generator.
Claim 39
Dependent Claim
34 words
A control system in accordance with claim 34 wherein: a time between the beginning of acceleration and the first time and a time between the beginning of acceleration and the second time are fixed.
References Cited (Backward Citations)
US2995957A
Cited
US3437188A
Cited
US3822770A
Cited
US4116321A
Cited
US4349094A
Cited
US4485443A
Cited
US4615425A
Cited
US4620624A
Cited
US4560047A
Cited
JPS59164420A
Cited
US4685062A
Cited
US4747082A
Cited
US4729461A
Cited
US4711329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |