Abstract: A transmission system for a work vehicle includes a transmission. The transmission includes one or more input shafts, one or more output shafts, and shafts disposed in-between. The transmission includes gear sets disposed on the shafts, wherein the gear sets include intermediate gear sets. The transmission includes clutches disposed along the shafts, wherein each of the clutches is configured to selectively couple a respective gear set of the gear sets corresponding to a respective power flow path of the transmission. The transmission also includes a forward coupler and a reverse coupler each disposed on one of the shafts. The transmission system also includes a controller configured to receive a signal indicative of a shuttle shift, and in response to receiving the signal, instruct the clutches to stop rotation of the intermediate gear sets and subsequently shuttle shift between forward and reverse directions.

Abstract: A method for determining and controlling engine speeds of a work vehicle during gear shifts may include controlling an operation of an engine and/or a transmission of a work vehicle so as to maintain the work vehicle operating at a requested speed, and determining a measured gear ratio for the transmission as a gear shift is occurring from a first gear ratio to a second gear ratio. The method may also include calculating a desired engine speed during the gear shift as a function of the requested speed and either the measured gear ratio or the second gear ratio. In addition, when the measured gear ratio differs from the first gear ratio by a predetermined threshold amount, the method may include controlling the engine speed based on the desired engine speed for a remainder of the gear shift from the first gear ratio to the second gear ratio.

Abstract: A method of controlling an input clutch and an output clutch, wherein the input clutch couples to a power source, the output clutch couples to a load, and the input clutch couples to the output clutch via gears, includes controlling torque of the input clutch based on a torque of the output clutch or a lookup table that controls the torque of the output clutch. The method also includes adjusting the torque of the input clutch based on a slip speed of the input clutch and a slip speed of the output clutch.

Abstract: A method for determining and controlling engine speeds of a work vehicle during gear shifts may include controlling an operation of an engine and/or a transmission of a work vehicle so as to maintain the work vehicle operating at a requested speed, and determining a measured gear ratio for the transmission as a gear shift is occurring from a first gear ratio to a second gear ratio. The method may also include calculating a desired engine speed during the gear shift as a function of the requested speed and either the measured gear ratio or the second gear ratio. In addition, when the measured gear ratio differs from the first gear ratio by a predetermined threshold amount, the method may include controlling the engine speed based on the desired engine speed for a remainder of the gear shift from the first gear ratio to the second gear ratio.

Abstract: A clutch control system for a work vehicle includes a controller having a memory and a processor. The controller is configured to receive a first signal indicative of a clutch pedal position, to determine an output torque based on the clutch pedal position, and to determine an inching torque for a control clutch based on the output torque and a first gear ratio downstream from the control clutch. The controller is also configured to determine an input torque based on the clutch pedal position, and to determine a launch torque for the control clutch based on the input torque and a second gear ratio upstream of the control clutch. The controller is also configured to determine a clutch control torque for the control clutch based on the inching torque and the launch torque, and to output a second signal indicative of the clutch control torque to the control clutch.

Abstract: A transmission system for a work vehicle includes a transmission. The transmission includes one or more input shafts, one or more output shafts, and shafts disposed in-between. The transmission includes gear sets disposed on the shafts, wherein the gear sets include intermediate gear sets. The transmission includes clutches disposed along the shafts, wherein each of the clutches is configured to selectively couple a respective gear set of the gear sets corresponding to a respective power flow path of the transmission. The transmission also includes a forward coupler and a reverse coupler each disposed on one of the shafts. The transmission system also includes a controller configured to receive a signal indicative of a shuttle shift, and in response to receiving the signal, instruct the clutches to stop rotation of the intermediate gear sets and subsequently shuttle shift between forward and reverse directions.

Abstract: A transmission system for a work vehicle includes a transmission. The transmission includes a first shaft, a second shaft, an input shaft, an output shaft, and an input gear pair comprising a first input gear and a second input gear. The transmission includes a first input clutch configured to selectively couple the input shaft to the first shaft, and a second input clutch configured to selectively couple the input shaft to the second shaft via the input gear pair. The transmission includes an output gear pair comprising a first output gear and a second output gear, wherein the first output gear is coupled to the first shaft, or the second output gear is coupled to the output shaft. The transmission also includes a first output clutch configured to selectively couple the second output gear to the output shaft, and a second output clutch configured to selectively couple the second shaft to the output shaft.

Abstract: An agricultural vehicle includes an engine, a transmission driven by the engine, and a controller. The controller, in operation, adjusts a gear ratio of the transmission using an algorithm. The algorithm, in operation, performs the following steps: reduce a torque capacity of a first offgoing clutch of the transmission to a first torque target, reduce the torque capacity of the first offgoing clutch to a second torque target while adjusting the torque capacity of a first oncoming clutch of the transmission to a third torque target, such that the gear ratio of the transmission is modified in a first direction, and increase the torque capacity of the first oncoming clutch to a desired torque capacity.

Abstract: A system includes an engine, a transmission driven by the engine, and a controller. The controller is configured to receive a speed input, receive feedback indicative of a load of the engine at a current engine speed, compare the load to a predetermined load threshold at the current engine speed, determine an expected engine speed based at least on the current engine speed, a current gear ratio, and an expected gear ratio, determine an estimated engine power at the expected engine speed and a current engine power at the current engine speed, and command a gear downshift when the load is greater than or equal to the predetermined load threshold and when the estimated engine power is greater than the current engine power.

Abstract: A method includes determining, via a processor, a speed ratio of a transmission system including a transmission based at least in part on an output speed of the transmission system and an input speed of the transmission system; determining, via the processor, a first torque percentage for a first clutch coupled to the transmission based at least in part on the speed ratio; determining, via the processor, a second torque percentage for a second clutch coupled to the transmission based at least in part on the speed ratio; outputting, via the processor, a signal indicative of a first torque command to a clutch assembly based at least in part on the first torque percentage; and outputting, via the processor, a signal indicative of a second torque command to the clutch assembly based at least in part on the second torque percentage.

Abstract: A clutch control system for a work vehicle includes a controller having a memory and a processor. The controller is configured to receive a first signal indicative of a clutch pedal position, to determine an output torque based on the clutch pedal position, and to determine an inching torque for a control clutch based on the output torque and a first gear ratio downstream from the control clutch. The controller is also configured to determine an input torque based on the clutch pedal position, and to determine a launch torque for the control clutch based on the input torque and a second gear ratio upstream of the control clutch. The controller is also configured to determine a clutch control torque for the control clutch based on the inching torque and the launch torque, and to output a second signal indicative of the clutch control torque to the control clutch.

Abstract: A clutch control system for a work vehicle includes a controller comprising a memory and a processor. The controller is configured to receive a first signal indicative of an inching pedal position and to determine a commanded inching torque based on the inching pedal position. The controller is configured to instruct an inching clutch to achieve the commanded inching torque while the commanded inching torque is less than a threshold inching torque. The controller is configured to instruct the inching clutch to achieve the threshold inching torque while the commanded inching torque is equal to or greater than the threshold inching torque. Herein the threshold inching torque is calculated based at least in part on a gear ratio established by engaging one or more clutches between an engine of the work vehicle and the inching clutch.

Abstract: A method of controlling an input clutch and an output clutch, wherein the input clutch couples to a power source, the output clutch couples to a load, and the input clutch couples to the output clutch via gears, includes controlling torque of the input clutch based on a torque of the output clutch or a lookup table that controls the torque of the output clutch. The method also includes adjusting the torque of the input clutch based on a slip speed of the input clutch and a slip speed of the output clutch.

Abstract: A transmission system for a work vehicle includes a transmission. The transmission includes a first shaft, a second shaft, an input shaft, an output shaft, and an input gear pair comprising a first input gear and a second input gear. The transmission includes a first input clutch configured to selectively couple the input shaft to the first shaft, and a second input clutch configured to selectively couple the input shaft to the second shaft via the input gear pair. The transmission includes an output gear pair comprising a first output gear and a second output gear, wherein the first output gear is coupled to the first shaft, or the second output gear is coupled to the output shaft. The transmission also includes a first output clutch configured to selectively couple the second output gear to the output shaft, and a second output clutch configured to selectively couple the second shaft to the output shaft.

Abstract: A method includes determining, via a processor, a speed ratio of a transmission system including a transmission based at least in part on an output speed of the transmission system and an input speed of the transmission system; determining, via the processor, a first torque percentage for a first clutch coupled to the transmission based at least in part on the speed ratio; determining, via the processor, a second torque percentage for a second clutch coupled to the transmission based at least in part on the speed ratio; outputting, via the processor, a signal indicative of a first torque command to a clutch assembly based at least in part on the first torque percentage; and outputting, via the processor, a signal indicative of a second torque command to the clutch assembly based at least in part on the second torque percentage.

Abstract: A system includes an engine, a transmission driven by the engine, and a controller. The controller is configured to receive a speed input, receive feedback indicative of a load of the engine at a current engine speed, compare the load to a predetermined load threshold at the current engine speed, determine an expected engine speed based at least on the current engine speed, a current gear ratio, and an expected gear ratio, determine an estimated engine power at the expected engine speed and a current engine power at the current engine speed, and command a gear downshift when the load is greater than or equal to the predetermined load threshold and when the estimated engine power is greater than the current engine power.

Abstract: An agricultural vehicle includes an engine, a transmission driven by the engine, and a controller. The controller, in operation, adjusts a gear ratio of the transmission using an algorithm. The algorithm, in operation, performs the following steps: reduce a torque capacity of a first offgoing clutch of the transmission to a first torque target, reduce the torque capacity of the first offgoing clutch to a second torque target while adjusting the torque capacity of a first oncoming clutch of the transmission to a third torque target, such that the gear ratio of the transmission is modified in a first direction, and increase the torque capacity of the first oncoming clutch to a desired torque capacity.

Abstract: A system includes an agricultural vehicle, including an engine; a transmission with multiple gear ratios driven by the engine, and a controller. The controller is configured to receive a requested wheel speed input by an operator, calculate a desired engine speed, command a gear upshift if a current engine speed is more than the desired engine speed and if upshifting will locate the current engine speed closer to the desired engine speed, and command a gear downshift if the current engine speed is less than the desired engine speed and if downshifting will locate the current engine speed closer to the desired engine speed.

Abstract: A method for controlling rollback of a work vehicle may include receiving a signal indicating that a pedal of the work vehicle has been depressed, wherein the work vehicle is initially traveling in a first direction up an inclined surface such that at least one clutch of the transmission is engaged. In addition, the method may include reducing a pressure within the at least one clutch after receiving the signal in order to decelerate the work vehicle in the first direction and engaging a parking brake of the work vehicle as the work vehicle reverses direction and travels in a second direction down the inclined surface.

Abstract: A method for performing a shuttle shift with a transmission of a work vehicle is disclosed, wherein the transmission includes an input shaft, a counter shaft and a plurality of driven shafts extending generally parallel to the input and counter shafts. The method may include disengaging a clutch associated with a first directional gear of a directional shaft of the plurality of driven shafts. The first directional gear may be configured to rotate the directional shaft in a first direction. Additionally, the method may include engaging clutches associated with at least two gears of at least one secondary driven shaft of the plurality of driven shafts to reduce a rotational speed of the directional shaft and, after the rotational speed of the directional shaft is reduced, engaging a clutch associated with a second directional gear of the directional shaft such that the directional shaft rotates in a second direction.