Hydraulic actuator system
First Claim
1. A system for hydraulically actuating at least one degree of freedom, said system comprising:
- a single prime mover for at least two actuation modules, wherein the prime mover produces rotary motion and is constituted by a battery powered electric motor, and each actuation module includes;
(1) an over-center variable displacement pump, said pump having;
(a) a power input connection configured to power the pump from said prime mover; and
(b) a displacement varying input for varying the displacement of the pump; and
(2) a displacement varying actuator configured to modulate the displacement varying input of the pump;
(3) an output actuator in direct communication with the pump, said output actuator being configured to drive an object through a corresponding degree of freedom, wherein the output actuator is in communication with each of a first and second side of the pump; and
(4) a feedback measurement that represents a force or motion of the output actuator, said feedback measurement being constructed from at least one sensor; and
a controller configured to control the prime mover and the displacement varying actuator for each of said at least two actuation modules, wherein said controller further controls motion of the prime mover and uses the feedback measurement to regulate the force or motion of the output actuator by controlling the displacement varying actuator.
1 Assignment
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Accused Products
Abstract
The invention is directed to controlling a hydraulic actuation system having at least one degree of freedom, a prime mover, at least one actuation module and a controller, with each actuation module including: an over-center variable displacement pump having a power input connection configured to power the pump from the prime mover and a displacement varying input for varying the displacement of the pump; a displacement varying actuator configured to modulate the displacement varying input of the pump; an output actuator in direct communication with the pump, the output actuator configured to drive a corresponding degree of freedom; and at least one sensor establishing a feedback measurement that represents a force or motion of the output actuator. Based on a value of each feedback measurement, the force or motion of the output actuator is regulated by controlling the prime mover and the displacement actuator for the output actuator.
10 Citations
25 Claims
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1. A system for hydraulically actuating at least one degree of freedom, said system comprising:
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a single prime mover for at least two actuation modules, wherein the prime mover produces rotary motion and is constituted by a battery powered electric motor, and each actuation module includes; (1) an over-center variable displacement pump, said pump having; (a) a power input connection configured to power the pump from said prime mover; and (b) a displacement varying input for varying the displacement of the pump; and (2) a displacement varying actuator configured to modulate the displacement varying input of the pump; (3) an output actuator in direct communication with the pump, said output actuator being configured to drive an object through a corresponding degree of freedom, wherein the output actuator is in communication with each of a first and second side of the pump; and (4) a feedback measurement that represents a force or motion of the output actuator, said feedback measurement being constructed from at least one sensor; and a controller configured to control the prime mover and the displacement varying actuator for each of said at least two actuation modules, wherein said controller further controls motion of the prime mover and uses the feedback measurement to regulate the force or motion of the output actuator by controlling the displacement varying actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for hydraulically actuating at least one degree of freedom, said system comprising:
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a single prime mover for at least two actuation modules, wherein the prime mover produces rotary motion and is constituted by a battery powered electric motor, and each actuation module includes; (1) an over-center variable displacement pump, said pump having; (a) a power input connection configured to power the pump from said prime mover; and (b) a displacement varying input for varying the displacement of the pump; and (2) a displacement varying actuator configured to modulate the displacement varying input of the pump; (3) an output actuator in direct communication with the pump, said output actuator being configured to drive an object through a corresponding degree of freedom; and (4) a feedback measurement that represents a force or motion of the output actuator, said feedback measurement being constructed from at least one sensor; and a controller configured to control the prime mover and the displacement varying actuator for each of said at least two actuation modules, wherein said controller further controls motion of the prime mover and uses the feedback measurement to regulate the force or motion of the output actuator by controlling the displacement varying actuator, wherein the controller controls the prime mover to a rotational speed, and the controller chooses said rotational speed by; (1) dividing the flow required by each said output actuator by a maximum displacement of a corresponding variable displacement pump of that output actuator, producing a required prime mover speed for that actuation module, (2) computing a maximum speed that is the maximum of an absolute value of each of the said required prime mover speeds, and (3) establishing said rotational speed to be slightly larger than said maximum speed. - View Dependent Claims (20)
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21. A system for hydraulically actuating at least one degree of freedom, said system comprising:
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a single prime mover for at least two actuation modules, wherein the prime mover produces rotary motion and is constituted by a battery powered electric motor, and each actuation module includes; (1) an over-center variable displacement pump, said pump having; (a) a power input connection configured to power the pump from said prime mover; and (b) a displacement varying input for varying the displacement of the pump; and (2) a displacement varying actuator configured to modulate the displacement varying input of the pump; (3) an output actuator in direct communication with the pump, said output actuator being configured to drive an object through a corresponding degree of freedom; and (4) a feedback measurement that represents a force or motion of the output actuator, said feedback measurement being constructed from at least one sensor; and a controller configured to control the prime mover and the displacement varying actuator for each of said at least two actuation modules, wherein said controller further controls motion of the prime mover and uses the feedback measurement to regulate the force or motion of the output actuator by controlling the displacement varying actuator, wherein the variable displacement pump comprises two rotating cores that hold pistons or vanes, and a translating housing. - View Dependent Claims (22, 23)
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24. A method for controlling a hydraulic actuation system having at least one degree of freedom, a single prime mover for at least two actuation modules, wherein the prime mover produces rotary motion and is constituted by a battery powered electric motor, and a controller for controlling motion of the prime mover, with each actuation module including:
- an over-center variable displacement pump having a power input connection configured to power the pump from said prime mover and a displacement varying input for varying the displacement of the pump;
a displacement varying actuator configured to modulate the displacement varying input of the pump;
an output actuator in direct communication with the pump, said output actuator configured to drive an object through a corresponding degree of freedom, wherein the output actuator is in communication with each of a first and second side of the pump; and
at least one sensor establishing a feedback measurement that represents a force or motion of the output actuator, said method comprising;reading a value of each feedback measurement; and controlling the force or motion of the output actuator using the feedback measurement by controlling the prime mover and the displacement actuator for the output actuator of a respective one of said at least two actuation modules.
- an over-center variable displacement pump having a power input connection configured to power the pump from said prime mover and a displacement varying input for varying the displacement of the pump;
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25. A system for hydraulically actuating one degree of freedom within a device, said system comprising:
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a prime mover and one actuation module, said module including; (1) an over-center variable displacement pump, said pump having; (a) a power input connection configured to power the pump from said prime mover, (b) a displacement varying input for varying a displacement of the pump, (2) a displacement varying actuator configured to modulate the displacement varying input of the pump, (3) an output actuator in direct communication with the pump, said output actuator configured to drive an object through a corresponding degree of freedom, wherein the output actuator is in communication with each of a first and second side of the pump, and (4) at least one sensor for constructing a feedback measurement that represents a force or motion of the output actuator, and a controller configured to control the prime mover and the displacement varying actuator wherein, when said output actuator is absorbing power from said device, said controller controls the prime mover and displacement varying actuator to; (1) regulate the force or motion of said output actuator, and (2) maximize power absorbed by said prime mover.
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Specification