CONTROL SYSTEM FOR A WORK MACHINE AND METHOD FOR CONTROLLING A HYDRAULIC CYLINDER IN A WORK MACHINE
First Claim
1. A control system for a work machine (101) comprising:
- an electric machine (202);
an hydraulic machine (204); and
at least one hydraulic cylinder (108);
the electric machine (202) being connected in a driving manner to the hydraulic machine (204);
the hydraulic machine (204) being connected to a piston side (208) of the hydraulic cylinder (108) via a first line (210) and a piston-rod side (212) of the hydraulic cylinder (108) via a second line (214); and
the hydraulic machine (204) being adapted to be driven by the electric machine (202) and supply the hydraulic cylinder (108) with pressurized hydraulic fluid from a tank (216) in a first operating state and to be driven by a hydraulic fluid flow from the hydraulic cylinder (108) and drive the electric machine in a second operating state.
1 Assignment
0 Petitions
Accused Products
Abstract
A control system for a work machine (101) including an electric machine (202), a hydraulic machine (204) and at least one hydraulic cylinder (108). The electric machine (202) is connected in a driving manner to the hydraulic machine (204). The hydraulic machine (204) is connected to a piston side (208) of the hydraulic cylinder (108) via a first line (210) and a piston-rod side (212) of the hydraulic cylinder (108) via a second line (214). The hydraulic machine (204) is adapted to be driven by the electric machine (202) and supply the hydraulic cylinder (108) with pressurized hydraulic fluid from a tank (216) in a first operating state and to be driven by a hydraulic fluid flow from the hydraulic cylinder (108) and drive the electric machine in a second operating state.
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Citations
63 Claims
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1. A control system for a work machine (101) comprising:
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an electric machine (202); an hydraulic machine (204); and at least one hydraulic cylinder (108); the electric machine (202) being connected in a driving manner to the hydraulic machine (204); the hydraulic machine (204) being connected to a piston side (208) of the hydraulic cylinder (108) via a first line (210) and a piston-rod side (212) of the hydraulic cylinder (108) via a second line (214); and the hydraulic machine (204) being adapted to be driven by the electric machine (202) and supply the hydraulic cylinder (108) with pressurized hydraulic fluid from a tank (216) in a first operating state and to be driven by a hydraulic fluid flow from the hydraulic cylinder (108) and drive the electric machine in a second operating state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for controlling a hydraulic cylinder (108, 109, 110) of a work machine (101 ), which hydraulic cylinder is adapted to move an implement (107) which is subjected to a load (116), the hydraulic cylinder being controlled by a hydraulic machine (204), said method comprising:
detecting that a lowering movement of the implement is initiated, and of before the lowering movement takes place driving the hydraulic machine (204) in a first rotation direction so that a first line (220) which connects the hydraulic machine (204) to said first side (208) of the piston (218) of the hydraulic cylinder is pressurized, which side is opposite a second side (212) on which said load acts. - View Dependent Claims (32, 33, 34, 35)
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36. A method for controlling a hydraulic cylinder (108, 109, 110) of a work machine (101) for the purpose of moving an implement (107) which is connected to the hydraulic cylinder, a hydraulic machine (204) providing the hydraulic cylinder with pressurized hydraulic fluid, said method comprising:
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detecting a load (116) acting on the implement (107); comparing the size of the detected load with a predetermined load level, and, if the detected load lies below the predetermined load level, bringing the piston-rod side (212) of the hydraulic cylinder into flow communication with the piston side (208) so that hydraulic fluid coming from the piston-rod side (212) is brought to the piston side (208) without passing through the hydraulic machine (204). - View Dependent Claims (37)
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38. A method for regenerating energy when an implement (107) of a work machine (101) is moved during movement of the work machine, at least one hydraulic cylinder (108, 109, 110) being connected to the implement for controlling its movements, said method comprising:
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delivering such a pressure to the hydraulic cylinder that the implement is brought into a basic position, of, in the event of a disturbance which results in a downward movement of the implement; allowing driving of a hydraulic machine (204) by a hydraulic fluid flow from the hydraulic cylinder; and regenerating the energy from the hydraulic machine (204) in an electric machine (202) connected to it in a driving manner. - View Dependent Claims (39, 40, 41, 42, 43)
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44. A method for springing a movement of an implement (107) of a work machine (101) during movement of the work machine, at least one hydraulic cylinder (108, 109, 110) being connected to the implement for controlling its movements, said method comprising:
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delivering such a pressure to the hydraulic cylinder that the implement is brought into a basic position; and bringing a first port (220) of the hydraulic machine (204) into flow communication with a piston side (208) of the hydraulic cylinder via a first line (210) and a second port (222) of the hydraulic machine (204) into flow communication with a piston-rod side (212) of the hydraulic cylinder via a second line (210), and of, in the event of a disturbance which results in an upward movement of the implement, supplying a corresponding quantity of hydraulic fluid to the hydraulic cylinder and, in the event of a downward movement of the implement, draining a corresponding quantity of hydraulic fluid from the hydraulic cylinder. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A control system for a work machine (101) comprising:
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a first subsystem (707, 709) for performing a first work operation and a second subsystem (731) for performing at least one second work operation; said first subsystem comprises an electric machine (202), a hydraulic machine (204) and at least one hydraulic cylinder (108, 109, 110), the electric machine (202) being connected in a driving manner to the hydraulic machine (204), the hydraulic machine (204) being connected to a piston side of the hydraulic cylinder via a first line and a piston-rod side of the hydraulic cylinder via a second line, the hydraulic machine being adapted to be driven by the electric machine and supply the hydraulic cylinder with pressurized hydraulic fluid from a tank in a first operating state and to be driven by a hydraulic fluid flow from the hydraulic cylinder and drive the electric machine in a second operating state; said second subsystem (731) comprises a drive unit (734) and a hydraulic actuator (732), the drive unit (734) comprising an electric machine (738) and a hydraulic machine (736), the electric machine being connected in a driving manner to the hydraulic machine, the hydraulic machine (736) being adapted for flow communication with the hydraulic actuator (732), and a means (748, 750, 756, 758) being adapted for controlling the movement of the hydraulic actuator (732). - View Dependent Claims (55, 56, 57, 58)
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59. A method for limiting a pressure which is delivered by a hydraulic machine (204, 705, 712, 714, 736) forming part of a control system, when the hydraulic machine is used as a pump, an electric machine (202, 703, 708, 710, 738) being connected in a driving manner to the hydraulic machine (204), said method comprising:
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detecting an operating parameter and of generating a corresponding parameter signal; determining a level of said pressure based on the level of the detected operating parameter; and comparing the determined pressure level with a predetermined maximum level and of controlling the hydraulic machine so that a delivered pressure lies below the predetermined maximum level. - View Dependent Claims (60, 61, 62, 63)
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Specification