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US 10,443,523 B2Granted
Supervisory control system to select PTO clutch engagement method based on real-time inertial load estimation
AssigneeCNH Industrial America LLC
InventorsKushan Vora, Haibo Guo, Brian Allen Hartman
Life of this patent
Estimating the term…
Abstract
A method for controlling power takeoff (PTO) clutch engagement includes determining an output clutch speed, adjusting a clutch current at a predetermined rate, estimating an inertial load of a PTO implement and adjusting the clutch current for one or more times at a time interval, and selecting a clutch control algorithm configured for the inertial load of the PTO implement.
Claims16
A system of a work vehicle, comprising:
- a power takeoff (PTO) system comprising:
- a PTO clutch comprising a clutch control solenoid valve configured to regulate supply of hydraulic fluid to the PTO clutch and control engagement and disengagement of the PTO clutch based on a clutch current;
- and
- a PTO output shaft coupled to the PTO clutch, wherein the PTO output shaft, in operation, is coupled to and drives a PTO implement;
- and
- a controller comprising a supervisory control system communicatively coupled to the PTO clutch, wherein the supervisory control system comprises a first clutch control logic configured for a first range of inertial loads of the PTO implement and a second clutch control logic configured for a second range of inertial loads of the PTO implement, wherein the supervisory control system, in operation:
- determines an output clutch speed of the PTO clutch;
- adjusts the clutch current of the PTO clutch at a predetermined rate by at least increasing the clutch current of the PTO clutch at the predetermined rate when the output clutch speed is less than a threshold output clutch speed;
- estimates an inertial load of the PTO implement and adjusts the clutch current for one or more times at a time interval;
- selects the first clutch control logic when the estimate is within the first range of inertial loads;
- and
- selects the second clutch control logic when the estimate is within the second range of inertial loads.
9 more elements
A tangible, non-transitory, machine-readable-medium, comprising machine-readable instructions to:
- determine an output clutch speed of a power takeoff (PTO) clutch of a work vehicle;
- adjust a clutch current of the PTO clutch at a predetermined rate;
- estimate an inertial load of a PTO implement and adjust the clutch current for one or more times at a time interval by at least:
- determining a difference between a measured clutch output shaft speed at a time during engagement and a measured clutch output shaft speed at a time of an immediately previous time interval;
- dividing the time interval by the difference;
- and
- multiplying a result of dividing the time interval by a clutch torque at the time during engagement;
- select a first clutch control algorithm configured for a first range of inertial loads when the estimate is within the first range of inertial loads;
- and
- select a second clutch control algorithm configured for a second range of inertial loads when the estimate is within the second range of inertial loads.
7 more elements
A method for controlling power takeoff (PTO) clutch engagement, comprising:
- determining an output clutch speed;
- adjusting a clutch current at a predetermined rate;
- estimating an inertial load of a PTO implement and adjusting the clutch current for one or more times at a time interval by at least:
- increasing the clutch current for the one or more time intervals;
- and
- determining a mean of the plurality of estimates of the inertial load of the PTO implement;
- and
- selecting a clutch control logic of a plurality of clutch control logics based on the estimate of the inertial load of the PTO implement.
5 more elements
Dependencies are inferred from the claim text.