US3744243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system
Assignee: APPLIC DES MACHINES MATRICES S
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Filing: 1971-01-04
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Granted: 1973-07-10
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Expires: 1991-01-04
Abstract
Abstract An electro hydraulic control system wherein the capacity of a variable pump is automatically controlled in response to the pressure in the conduits which couple the pump to a fluid driven motor. Signals commensurate with pressure are generated and fed back to a control signal generating means which adjusts pump capacity via a servovalve.
Inventors
- 👤 J Faisandier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:06
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; F15B21/087; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/472
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
158 words
Apparatus for exercising control over a fluid driven system, said fluid driven system including a variable capacity pump coupled to a motor by conduit means and actuator means connected to the pump for adjusting the capacity thereof, said control apparatus comprising: means for sensing the pressure in said conduit means and for generating electrical signals commensurate therewith; control signal generating means responsive to electrical signals applied thereto for generating actuator means electrical control signals when one of said signals commensurate with pressure exceeds a predetermined value; means coupled to the actuator means and responsive to said electrical control signals for converting said control signals to motion of the actuator means whereby the pump cylinder capacity will be decreased if the predetermined pressure value is exceeded; means applying electrical command signals as an input to said control signal generating means; and means for feeding back said signals commensurate with pressure to an input of said control signal generating means.
Claim 2
Dependent Claim
158 words
Apparatus for exercising control over a fluid driven system, said fluid driven system including a variable capacity pump coupled to a motor by conduit means and actuator means connected to the pump for adjusting the capacity thereof, said control apparatus comprising: means for sensing the pressure in said conduit means and for generating electrical signals commensurate therewith; control signal generating means responsive to electrical signals applied thereto for generating actuator means electrical control signals when one of said signals commensurate with pressure exceeds a predetermined value; means coupled to the actuator means and responsive to said electrical control signals for converting said control signals to motion of the actuator means whereby the pump cylinder capacity will be decreased if the predetermined pressure value is exceeded; means applying electrical command signals as an input to said control signal generating means; and means for feeding back said signals commensurate with pressure to an input of said control signal generating means.
Claim 3
Dependent Claim
51 words
The apparatus of claim 1 further comprising: means for generating a signal commensurate with pump capacity; means for multiplying said pump capacity signal by an electrical signal commensurate with pressure in said conduit means; and means for delivering the signal provided by said multiplying means to said control signal generating means.
Claim 4
Dependent Claim
65 words
The apparatus of claim 1 wherein said pump and motor are connected by a pair of conduits and wherein said pressure sensing means comprises: a pressure sensor operatively associated with each of said conduits, said sensors including piston means positioned in relation to conduit pressure; and transducer means mechanically connected to each of said sensor piston means for generating electrical signals commensurate with conduit pressure.
Claim 5
Dependent Claim
65 words
The apparatus of claim 2 wherein said pump and motor are connected by a pair of conduits and wherein said pressure sensing means comprises: a pressure sensor operatively associated with each of said conduits, said sensors including piston means positioned in relation to conduit pressure; and transducer means mechanically connected to each of said sensor piston means for generating electrical signals commensurate with conduit pressure.
Claim 6
Dependent Claim
40 words
The apparatus of claim 4 wherein said multiplying means comprises: potentiometer means having its wiper arm mechanically coupled to said control signal generating means; and means applying the signal generated by one of said transducer means across said potentiometer means.
Claim 7
Dependent Claim
100 words
Apparatus for exercising control over a fluid driven system, said fluid driven system including a variable capacity pump coupled to a motor by conduit means and actuator means connected to the pump for adjusting the capacity thereof, said system further including an electric power prime mover for the pump, said control apparatus comprising: means for sensing the current drawn by said electric motor and for providing a signal commensurate therewith, said signal commensurate with current being indicative of the pressure in said conduit means; and means responsive to said signal commensurate with motor current for controlling the pump actuator means.
Claim 8
Dependent Claim
100 words
Apparatus for exercising control over a fluid driven system, said fluid driven system including a variable capacity pump coupled to a motor by conduit means and actuator means connected to the pump for adjusting the capacity thereof, said system further including an electric power prime mover for the pump, said control apparatus comprising: means for sensing the current drawn by said electric motor and for providing a signal commensurate therewith, said signal commensurate with current being indicative of the pressure in said conduit means; and means responsive to said signal commensurate with motor current for controlling the pump actuator means.
Claim 9
Dependent Claim
53 words
The apparatus of claim 6 wherein said electric motor is a direct current motor and wherein said control apparatus further comprises: means connected between said current sensing means and said actuator controlling means for delivering a signal of pRoper polarity to said controlling means regardless of direction of rotation of said electric motor.
Claim 10
Dependent Claim
29 words
The apparatus of claim 6 further comprising: voltage limiter means connected to said current sensing means for limiting the magnitude of the signals applied to the actuator controlling means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |