Controlling the deadband of a fluid system
First Claim
1. A method for controlling a fluid system, the system including a hydraulic circuit having a pump driven by an engine, the pump delivering fluid to an actuator through a valve assembly, the method comprising:
- receiving an operator input;
determining a condition of the hydraulic circuit, the condition of the hydraulic circuit including at least one of a flow rate of fluid to the actuator, an engine speed, and a pump displacement;
determining a valve transform function as a function of the condition of the hydraulic circuit and a position of a linkage associated with the actuator;
determining a valve command in response to the valve transform function and the operator input, the valve command resulting in a consistent deadband; and
delivering the valve command to the valve assembly.
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Accused Products
Abstract
A method for controlling a fluid system is provided. The system may include a hydraulic circuit having a pump driven by an engine, wherein the pump delivers fluid to an actuator through a valve assembly. The method may include receiving an operator input and determining a condition of the hydraulic circuit. The condition of the hydraulic circuit may include at least one of a flow rate of fluid to the actuator, an engine speed, and a pump displacement. The method may include determining a valve transform function as a function of a position of a linkage associated with the actuator and the condition of the hydraulic circuit. The method may further include determining a valve command in response to the valve transform function and the operator input, wherein the valve command results in a consistent deadband. The valve command is delivered to the valve assembly.
27 Citations
19 Claims
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1. A method for controlling a fluid system, the system including a hydraulic circuit having a pump driven by an engine, the pump delivering fluid to an actuator through a valve assembly, the method comprising:
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receiving an operator input;
determining a condition of the hydraulic circuit, the condition of the hydraulic circuit including at least one of a flow rate of fluid to the actuator, an engine speed, and a pump displacement;
determining a valve transform function as a function of the condition of the hydraulic circuit and a position of a linkage associated with the actuator;
determining a valve command in response to the valve transform function and the operator input, the valve command resulting in a consistent deadband; and
delivering the valve command to the valve assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling a fluid system, the system including a hydraulic circuit having a pump driven by an engine, the pump delivering fluid to an actuator through a valve assembly, comprising:
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establishing a first motion deadband;
receiving an operator input;
determining a position of a linkage associated with the actuator;
determining a flow rate of fluid to the actuator; and
determining a valve command in response to the linkage position and at least one of the fluid flow rate, the first motion deadband, and the operator input, the valve command resulting in a consistent deadband.
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14. A fluid system, comprising:
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a hydraulic circuit including a pump, an engine structured and arranged to drive the source of pressurized fluid, an actuator, and a valve assembly operable to control flow of pressurized fluid from the source of pressurized fluid to the actuator;
a linkage associated with the actuator;
an input controller configured to receive an operator input and responsively generate an input signal; and
a controller configured to receive the input signal, a linkage position signal, and at least one of a flow rate signal corresponding to fluid flow to the actuator, an engine speed signal, and a pump displacement signal, the controller being configured to determine a valve transform function in response to the linkage position signal and at least one of the fluid flow rate signal, the engine speed signal, and the pump displacement signal, the controller being further configured to determine a valve command in response to the input signal and the valve transform function, the valve command resulting in a consistent deadband. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification