Drift compensation control method for a machine
First Claim
1. A method of controlling a machine having a linkage coupled with a hydraulic actuation system comprising the steps of:
- suspending a load with the linkage;
lowering the load, including leaking hydraulic fluid from at least a portion of the hydraulic actuation system during suspending the load with the linkage;
sensing an operating parameter value during lowering the load;
generating an electronic drift compensation control signal responsive to leaking hydraulic fluid and subsequent to lowering the load;
supplying a fluid to an hydraulic actuator of the hydraulic actuation system during suspending the load with the linkage; and
adjusting at least one of a flow rate or pressure of the fluid being supplied to the hydraulic actuator, responsive to the drift compensation control signal.
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Accused Products
Abstract
A method of controlling a machine having a hydraulically actuated linkage includes lowering a load suspended by the leakage at least in part by leaking hydraulic fluid from a portion of a hydraulic actuation system, and generating a drift compensation control signal responsive to leaking hydraulic fluid. A machine includes an electronic controller in control communication with a valve, the electronic controller being configured to compensate for leakage induced drift of at least one hydraulic actuator of a machine hydraulic system by selectively commanding adjusting of the valve if drift criteria for the hydraulic system are satisfied.
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Citations
20 Claims
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1. A method of controlling a machine having a linkage coupled with a hydraulic actuation system comprising the steps of:
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suspending a load with the linkage; lowering the load, including leaking hydraulic fluid from at least a portion of the hydraulic actuation system during suspending the load with the linkage; sensing an operating parameter value during lowering the load; generating an electronic drift compensation control signal responsive to leaking hydraulic fluid and subsequent to lowering the load; supplying a fluid to an hydraulic actuator of the hydraulic actuation system during suspending the load with the linkage; and adjusting at least one of a flow rate or pressure of the fluid being supplied to the hydraulic actuator, responsive to the drift compensation control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of compensating for actuator drift in a hydraulic system comprising the steps of:
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changing a position of at least one hydraulic actuator of the hydraulic system at least in part by leaking hydraulic fluid from the at least one hydraulic actuator responsive to a load thereon; sensing an operating parameter value during changing the position of the at least one hydraulic actuator; generating an electronic drift compensation control signal responsive to leaking hydraulic fluid and responsive to sensing the operating parameter value; and decreasing at least one of a flow rate or a pressure of fluid being supplied to the at least one hydraulic actuator from a first level to a second level, in response to the drift compensation control signal. - View Dependent Claims (13, 14, 15, 16)
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17. A machine comprising:
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a hydraulic system having a valve and at least one hydraulic actuator; a sensor configured to sense an operating parameter indicative of a position of the at least one hydraulic actuator; and an electronic controller coupled with said sensor and in control communication with said valve, and configured to compensate for leakage induced drift of said at least one hydraulic actuator by selectively commanding adjusting of said valve if actuator drift criteria are satisfied; and said electronic controller being further configured by way of commanding adjusting said valve to increase at least one of a flow rate or a pressure of fluid supplied to said at least one hydraulic actuator if actuator drift criteria indicative of a first difference between a target actuator position and a sensed actuator position are satisfied; and said electronic controller being further configured by way of commanding adjusting said valve to decrease at least one of a flow rate or a pressure of fluid supplied to said at least one hydraulic actuator if actuator drift criteria indicative of a second difference between a target actuator position and a sensed actuator position are satisfied. - View Dependent Claims (18, 19, 20)
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Specification