Abstract: A method of performing a directional shifting event in a hydrostatic drive work machine, and a hydrostatic drive work machine is provided. The method includes the step of adjusting a pump displacement of a variable displacement pump coupled with an engine and a hydraulic motor of the work machine, at a rate based at least in part on one or both of a predetermined acceleration limit and a predetermined jerk limit of the work machine. The work machine includes an electronic control module having a computer readable medium with a directional shifting control algorithm recorded thereon. The control algorithm is operable to adjust a pump displacement in a hydrostatic drive of the work machine at a rate based at least in part on one or both of the predetermined acceleration limit or jerk limit of the work machine.

Abstract: A method of shifting gears in a work machine includes modulating an oncoming clutch pressure via a first segment of a predetermined curve, and modulating the clutch pressure via a second segment of the predetermined curve after the occurrence of a predetermined relative velocity state of a work machine transmission. A work machine having an electronic controller with an embedded shifting control algorithm that includes means for modulating the oncoming clutch pressure via a first segment of a predetermined curve, and via a second segment of a predetermined curve having a net slope different from the first segment after the occurrence of a predetermined relative velocity state of the work machine transmission.

Abstract: A method of reducing speed in a hydrostatic drive work machine, and a hydrostatic drive work machine are provided. The method includes the steps of retarding the work machine by at least one of, upstroking a variable displacement hydraulic motor thereof, and downstroking a variable displacement pump coupled with the motor. An offgoing clutch pressure is dropped after each of the motor and pump displacements reaches a predetermined point. The steps of slowing the work machine are carried out by adjusting the respective displacements at rates based on a predetermined acceleration limit and/or a predetermined jerk limit of the work machine. The hydrostatic drive work machine further includes an electronic control module having a control algorithm recorded thereon for to neutral.

Abstract: The present disclosure provides a hydrostatic drive work machine, and a method and control module having a control algorithm for performing a downshifting event in the work machine. The method includes the step of inducing a retarded mode in the work machine, if upon commanding a downshift the work machine is not in a retarded mode. The method further includes the steps of adjusting a displacement of each of a variable displacement pump and a variable displacement motor in a hydrostatic drive of the work machine, and increasing pressure on a low clutch of the work machine. The control algorithm includes means for inducing a retarded mode in the work machine, if the work machine is not in a retarded mode upon commanding a downshift, with at least one of a variable displacement motor and a variable displacement pump in a hydrostatic drive of the work machine.