A pressure regulator includes an inlet adapted to be connected to a pressure source and a chamber in which the pressure is to be regulated. An orifice is provided between the inlet and the chamber for metering the flow of hydraulic fluid therebetween. In addition, regulating means is provided adjace
A pressure regulator includes an inlet adapted to be connected to a pressure source and a chamber in which the pressure is to be regulated. An orifice is provided between the inlet and the chamber for metering the flow of hydraulic fluid therebetween. In addition, regulating means is provided adjacent the orifice and is movable in a timed relation in response to a series of pulse signals for changing the effective flow area of said orifice whereby the pressure in the chamber varies with the integral of the voltage pulses.
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1. A hydraulic pressure regulating device including means defining a chamber having an inlet and an outlet, an orifice disposed in said inlet and having a predetermined cross-sectional area for metering the flow of pressurized fluid relative to said chamber, a source of hydraulic pressure coupled
1. A hydraulic pressure regulating device including means defining a chamber having an inlet and an outlet, an orifice disposed in said inlet and having a predetermined cross-sectional area for metering the flow of pressurized fluid relative to said chamber, a source of hydraulic pressure coupled to said inlet, electroresponsive regulating means having a plunger means oriented in an opposed relation relative to said orifice and adjacent thereto, operable to move said plunger said regulating means being operable to move said plunger in a timed relation in response to each of a series of electrical pulse signals for movement from a first position relative to said orifice to a second position and for returning said plunger means to its first position upon cessation of each pulse signal for changing the effective flow area of said orifice whereby the pressure in said chamber varies with the integral of said signals, and pressure responsive means communicating with said chamber and movable from a null position in response to changes in pressure within said chamber. 2. The pressure regulating device set forth in claim 1 wherein said plunger means is displaced first and second predetermined finite distances from said orifice when it is in each of its first and second positions respectively. 3. The pressure regulator set forth in claim 2 and including means for modifying the width of said pulse signals for changing the pressure within said chamber. 4. The pressure regulator set forth in claim 3 wherein said pressure responsive means include piston means, biasing means for biasing said piston means into said null position, said piston means being movable out of its null position in response to pressure changes within said chamber. 5. The pressure regulator set forth in claim 4 and including means defining a passage for coupling a hydraulic device to a source of hydraulic pressure, said pressure responsive means being disposed in said passage means and being operative for changing the flow rate of fluid between said source and said hydraulic device upon movement into and out of its null position. 6. The pressure regulator set forth in claim 2 wherein a second orifice is disposed in said outlet. 7. The pressure regulator set forth in claim 6 wherein said pressure responsive means include piston means, biasing means for biasing said piston means into said null position, said piston means being movable out of its null position in response to pressure changes within said chamber. 8. The pressure regulator set forth in claim 7 and including means defining a passage for coupling a hydraulic device to a source of hydraulic pressure, said pressure responsive means being disposed in said passage means and being operative for changing the flow rate of fluid between said source and said hydraulic device on movement into and out of its null position. 9. The pressure regulator set forth in claim 1 and including means defining first and second chambers, first and second orifices for metering the flow of pressurized fluid relative to first and second chambers respectively, first and second regulating means each having plunger means associated with one of said orifices respectively, means for selectively energizing one of said first and second regulating means with a series of pulse signals whereby the plunger associated with the energized regulating means is moved relative to its associated orifice to vary the pressure within one of said cylinders. 10. The pressure regulator set forth in claim 9 wherein each of said first and second said orifices has a pre-determined cross-sectional area, said regulating means including first and second electroresponsive means each having a plunger means oriented in an opposed relation respectively relative to said first and second orifices, each said electroresponsive means being operative in response to an electrical pulse signal for movement from a first position relative to the one of said orifices to a second position and for returning said plunger means to its first position upon the cessation of each pulse signal. 11. The pressure regulator set forth in claim 10 and including pressure responsive means communicating with said chambers and movable from a null position in a first direction in response to a change in pressure within said first chamber and in a second direction in response to a change in pressure within said second chamber. 12. The pressure regulator set forth in claim 11 and including means for modifying the width of said pulse signals for changing pressure within said chamber and for selectively applying said pulse signals to said first or second electroresponsive means. 13. The pressure regulator set forth in claim 12 wherein said pressure responsive means includes piston means, biasing means for biasing said piston means into said null position, said piston means being movable out of its null position in response to pressure changes within said first or second chambers. 14. The pressure regulator set forth in claim 13 and including means defining a passage for coupling a hydraulic device to a source of hydraulic pressure, said pressure responsive means being disposed in said passage means and being operative for changing the direction and flow rate of fluid between said source and said hydraulic device upon movement into and out of its null position. 15. The pressure regulator set forth in claim 14 wherein each said chamber has an inlet and an outlet, said first and second orifices being disposed respectively in said inlets, the first position of said plungers, being adjacent said orifice, whereby the pressure in said chambers is related to the integral of said pulse signals. 16. The pressure regulator set forth in claim 15 wherein third and fourth orifices are disposed in the outlets of said first and second chambers respectively. 17. The pressure regulating device set forth in claim 2 wherein the electroresponsive regulating means comprises a solenoid having a response time shorter than the duration of said pulse signals or the interval therebetween whereby said plunger will move to its second position upon the initiation of each signal and return to its first position upon the cessation thereof. 18. A method of regulating hydraulic pressure within a chamber having an inlet opening connected to a source of hydraulic pressure and an outlet opening and an orifice disposed between said inlet opening and said chamber, the steps of: disposing a plunger means in an opposed relation to said orifice whereby the distance between said plunger means and said orifice will control the pressure drop across said orifice, generating a series of discrete electrical pulse signals, moving said plunger means into a first position which is a first finite distance from said orifice in response to the initiation of each pulse signal and into a second position which is a second finite distance from said orifice in response to the cessation of each pulse signal, and controlling the duration of said pulse signals whereby the pressure within said chamber is controlled in relation to the integral of said pulse signals. 19. The method set forth in claim 18 and including the steps of progressively increasing the width of said pulse signals during a first time period and progressively decreasing the width of said pulse signals during a second time period whereby the pressure within said chamber will increase during said first period and decrease during said second period. 20. The method set forth in claims 18 or 19 wherein there are first and second chambers each having an inlet connected to said source and an outlet and first and second orifices respectively disposed between said inlets and said first and second chambers and first and second plunger means respectively disposed adjacent said first and second orifices and first and second electroresponsive means for respectively moving said first and second plungers relative to said orifices upon the receipt of said signals, and including the step of selectively providing said pulse signals to one of said electroresponsive means to increase the pressure in a selected one of said chambers. 21. The method set forth in claim 18 and including the step of progressively modifying the width of said pulse signals from a first width to a second width over a predetermined time period to modify the pressure within said chamber from a first preselected value to a second preselected value. 22. The method set forth in claim 18 wherein said pulse signals have a predetermined frequency and increasing the integral of said signals from a first value to a second value at a controlled rate so that the pressure within the chamber increases from a first value to a second value at a predetermined controlled rate. 23. A method of controlling the hydraulic pressure in a chamber having an inlet opening and an outlet opening, providing hydraulic fluid under pressure to said inlet opening and withdrawing hydraulic fluid from said outlet opening, positioning a plunger a first predetermined distance from said inlet opening to provide a first predetermined pressure drop across said inlet opening during each of a first series of discrete repetitive time intervals which are separated by intermediate time intervals, positioning the plunger a second predetermined distance from the inlet opening to provide a second predetermined pressure drop across said orifice during each intermediate time interval to provide a predetermined pressure within said chamber, and gradually modifying the length of the first time intervals relative to the intermediate time intervals so that the pressure within said chamber will change from a first predetermined value to a second predetermined value at a rate which is functionally related to the rate at which the relative lengths of said intervals are modified. 24. A hydraulic pressure regulating device including means defining a hydraulic chamber having first and second openings, an orifice disposed in one of said openings, a source of hydraulic pressure coupled to one of said openings, pulse generating means for generating a series of discrete electrical pulse signals each having a time duration and a time interval between pulses, electroresponsive regulating means including a plunger disposed in an oppposed relation relative to said orifice, said regulating means being coupled to said pulse generating means and operable to move said plunger from a first poistion displaced a first predetermined distance from the orifice upon the initiation of each pulse signal to a second position displaced a second predetermined distance from said orifice and for returning the plunger to its first position upon the termination of a pulse signal so that the effective flow area of the orifice is a function of the time integral of the pulse signals, and means for modifying the integral of said pulse signal so that the pressure within said chamber can be modified at a controlled rate.
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