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US 10,704,569 B2Granted
Hydraulic system and method for controlling a hydraulic system
AssigneeNorrhydro Oy
InventorsAri Sipola, Mika Sahlman
Life of this patent
Estimating the term…
Abstract
A hydraulic system and a method comprising a linear actuator 23 for generating discrete sum forces, chambers A-D for generating discrete force components, at least two charging circuits 3,4 configured to maintain predetermined pressure levels of hydraulic fluid, independent control interfaces 9-16 configured to open and close connections of the first and second charging circuits to the chambers, and an electronic control unit 50 for controlling the control interfaces. At least two control interfaces are proportional valves which are used as shut-off valves and are independently switchable to the open and closed positions in a controlled manner. Moreover, non-throttled control and secondary control are implemented in the hydraulic system and the method.
Claims18
A hydraulic system comprising:
- a linear actuator configured to generate a plurality of discrete sum forces of different magnitudes;
- at least four chambers provided in the linear actuator and configured to generate a plurality of discrete force components where combinations of the plurality of discrete force components generate the plurality of sum forces;
- at least two charging circuits configured to maintain predetermined pressure levels of hydraulic fluid including a first pressure level of a first charging circuit of the at least two charging circuits and a second pressure level of a second charging circuit of the at least two charging circuits, and the at least two charging circuits being configured to supply hydraulic fluid to the linear actuator and to receive hydraulic fluid from the linear actuator;
- a plurality of independent control interfaces configured to open and close connections of the first and second charging circuits to the at least four chambers, the plurality of control interfaces including at least:
- a first control interface configured to open and close the connection of the first charging circuit to the first chamber;
- and
- a second control interface configured to open and close the connection of the second charging circuit to the first chamber;
- and
- an electronic control unit configured to control at least two of the plurality of control interfaces, including the first and the second control interfaces, wherein:
- at least two of the control interfaces, including the first and the second control interfaces, are proportional valves which are used as shut-off valves and are independently shiftable to the open and closed positions in a controlled manner, and
- the control unit, the linear actuator, and the proportional valves are configured to couple the first and second pressure levels to the first chamber causing discrete force components to be produced corresponding the first and second pressure levels.
8 more elements
A method comprising controlling a hydraulic system, the hydraulic system including:
- a linear actuator for generating a plurality of discrete sum forces of different magnitudes;
- at least four chambers provided in the linear actuator and generating a plurality of discrete force components where combinations of the plurality of discrete force components generate the plurality of sum forces;
- at least two charging circuits maintaining predetermined pressure levels of hydraulic fluid, the predetermined pressure levels of hydraulic fluid including a first pressure level of a first charging circuit of the at least two charging circuits and a second pressure level of a second charging circuit of the at least two charging circuits, the at least two charging circuits supplying hydraulic fluid to the linear actuator and receiving hydraulic fluid from the linear actuator;
- a plurality of independent control interfaces opening and closing connections of the first and second charging circuits to the at least four chambers, the plurality of control interfaces including at least:
- a first control interface for opening and closing the connection of the first charging circuit to a first chamber of the at least four chambers, and
- a second control interface for opening and closing the connection of the second charging circuit to the first chamber;
- and
- an electronic control unit controlling at least two of the plurality of control interfaces including the first and the second control interfaces, wherein:
- the at least two of the plurality of control interfaces including the first and the second control interfaces, are proportional valves which are used as shut-off valves and are independently shiftable to the open and closed positions in a controlled manner, and
- the control unit, the linear actuator, and the proportional valves are configured to couple the first and second pressure levels to the first chamber causing discrete force components to be produced corresponding the first and second pressure levels.
7 more elements
Dependencies are inferred from the claim text.