HYDRAULIC SYSTEM AND METHOD FOR CONTROL
First Claim
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1. A hydraulic system comprising:
- a source of pressurized fluid;
a first hydraulic circuit configured to receive pressurized fluid from the source and having a first valve and a first actuator, the first valve being disposed between the source and the first actuator, and the first actuator operating at a first pressure;
a second hydraulic circuit configured to receive pressurized fluid from the source and having a second valve and a second actuator, the second valve being disposed between the source and the second actuator, and the second actuator operating at a second pressure; and
a controller configured to;
receive a command input;
based on the command input, determine a first initial flow passing command for the first valve and a second initial flow passing command for the second valve;
determine which of the first pressure and the second pressure is a higher pressure; and
alter the initial flow passing command for a high pressure valve, the high pressure valve being the one of the first valve and the second valve corresponding to the higher pressure.
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Abstract
A hydraulic system is disclosed having at least two hydraulic circuits. The disclosed system compares pressures between the hydraulic circuits and alters valve commands of the circuit associated with higher pressures in order to reduce overall system pressure.
68 Citations
20 Claims
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1. A hydraulic system comprising:
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a source of pressurized fluid; a first hydraulic circuit configured to receive pressurized fluid from the source and having a first valve and a first actuator, the first valve being disposed between the source and the first actuator, and the first actuator operating at a first pressure; a second hydraulic circuit configured to receive pressurized fluid from the source and having a second valve and a second actuator, the second valve being disposed between the source and the second actuator, and the second actuator operating at a second pressure; and a controller configured to; receive a command input; based on the command input, determine a first initial flow passing command for the first valve and a second initial flow passing command for the second valve; determine which of the first pressure and the second pressure is a higher pressure; and alter the initial flow passing command for a high pressure valve, the high pressure valve being the one of the first valve and the second valve corresponding to the higher pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A machine comprising:
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a frame; an implement; a source of pressurized fluid; a first hydraulic circuit configured to receive pressurized fluid from the source and having a first valve and a first actuator disposed between the frame and the implement, the first valve being disposed between the source and the first actuator, the first actuator operating at a first pressure; a second hydraulic circuit configured to receive pressurized fluid from the source and having a second valve and a second actuator, the second valve being disposed between the source and the second actuator, and the second actuator operating at a second pressure; and a controller configured to; receive an operator input; based on the operator input, determine a first initial flow command for the first valve and a second initial flow command for the second valve; determine which of the first pressure and the second pressure is a higher pressure; and alter the initial flow passing command for a high pressure valve, the high pressure valve being the one of the first valve and the second valve corresponding to the higher pressure. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of controlling a hydraulic system having a first hydraulic circuit and a second hydraulic circuit comprising the steps:
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determining a first pressure and first initial flow command associated with the first hydraulic circuit; determining a second pressure and second initial flow command associated with the second hydraulic circuit; determining which of the first pressure and the second pressure is a higher pressure; and altering the initial flow command for a high pressure circuit, the high pressure circuit being the one of the first circuit and the second circuit corresponding to the higher pressure. - View Dependent Claims (18, 19, 20)
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Specification