Hydraulic system having multiple actuators and an associated control method
First Claim
1. A hydraulic system comprising:
- an operator input device for providing signals that are indicative of operative commands;
a source of hydraulic fluid flow;
a plurality of actuators;
a plurality of valves, at least one valve being associated with each actuator for controlling a flow of fluid to and from the actuator;
a pressure sensor for sensing an actual pressure between the source of hydraulic fluid flow and the valves and for generating in a pressure signal; and
a controller that, in response to a signal from the operator input device,calculates a hydraulic pressure to be supplied to each of the actuators to move the actuators as commanded,controls the source of hydraulic fluid flow and the valves for powering the actuators with the calculated hydraulic pressure,thereafter monitors the pressure signal that is generated by the pressure sensor to determine whether the source of hydraulic fluid flow is capable of providing the calculated hydraulic pressure, andin response to a determination that the source of hydraulic fluid flow is not capable of providing the calculated hydraulic pressure, calculates a discrepancy ratio by dividing the pressure signal from the pressure sensor by the hydraulic pressure to be supplied to each of the actuators, and modifies actuation of the actuators with the discrepancy ratio.
3 Assignments
0 Petitions
Accused Products
Abstract
A hydraulic system, and associated method of control, includes an operator input device, a source of hydraulic fluid flow, and a plurality of actuators. At least one valve associated with each actuator for controlling a flow of fluid to and from the actuator. A controller is responsive to a signal from the operator input device to calculate a hydraulic pressure to be supplied to each of the actuators. The controller controls the source of hydraulic fluid flow and the valves for powering the actuators with the calculated hydraulic pressure. The controller also monitors a sensed parameter to determine whether the actuators can be powered with the calculated hydraulic pressure, and in response to a determination that the actuators cannot be powered with the calculated hydraulic pressure, calculates a discrepancy ratio and modifies actuation of the actuators with the discrepancy ratio.
44 Citations
16 Claims
-
1. A hydraulic system comprising:
-
an operator input device for providing signals that are indicative of operative commands; a source of hydraulic fluid flow; a plurality of actuators; a plurality of valves, at least one valve being associated with each actuator for controlling a flow of fluid to and from the actuator; a pressure sensor for sensing an actual pressure between the source of hydraulic fluid flow and the valves and for generating in a pressure signal; and a controller that, in response to a signal from the operator input device, calculates a hydraulic pressure to be supplied to each of the actuators to move the actuators as commanded, controls the source of hydraulic fluid flow and the valves for powering the actuators with the calculated hydraulic pressure, thereafter monitors the pressure signal that is generated by the pressure sensor to determine whether the source of hydraulic fluid flow is capable of providing the calculated hydraulic pressure, and in response to a determination that the source of hydraulic fluid flow is not capable of providing the calculated hydraulic pressure, calculates a discrepancy ratio by dividing the pressure signal from the pressure sensor by the hydraulic pressure to be supplied to each of the actuators, and modifies actuation of the actuators with the discrepancy ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of controlling a hydraulic system having an operator input device for providing signals indicative of operator commands, a source of hydraulic fluid flow, a plurality of actuators, a plurality of valves, a pressure sensor for sensing an actual pressure between the source of hydraulic fluid flow and the valves and for generating a pressure signal, and a controller, at least one valve being associated with each actuator for controlling a flow of fluid to and from the actuator, the method comprising the steps of:
-
calculating, in response to a signal from the operator input device, a hydraulic pressure to be supplied to each of the actuators to move the actuators as commanded; controlling the source of hydraulic fluid flow and the valves for powering the actuators with the calculated hydraulic pressure; thereafter monitoring the pressure signal that is generated by the pressure sensor to determine whether the source of hydraulic fluid flow is capable of providing the calculated hydraulic pressure; calculating, in response to a determination that the source of hydraulic fluid flow is not capable of providing the calculated hydraulic pressure, a discrepancy ratio by dividing the pressure signal from the pressure sensor by the hydraulic pressure to be supplied to each of the actuators; and modifying actuation of the actuators with the discrepancy ratio. - View Dependent Claims (14, 15, 16)
-
Specification