A vehicle control system and method utilize a transmission control module configured to generate a first target speed for a torque generating system for executing a downshift of an automatic transmission and a torque generating system control module configured to determine a second target speed for the torque generating system for executing the downshift of the automatic transmission, determine upper and lower target speed limits for the torque generating system for executing the downshift of the automatic transmission, based on the first and second target speeds and the upper and lower target speed limits, determine a final target speed for the torque generating system for executing the downshift of the automatic transmission, determine a target torque output for the torque generating system based on a current speed of and the final target speed for the torque generating system, and control the torque generating system based on the target torque output.

A work vehicle includes an engine, a hydrostatic transmission, a storage device storing leakage flow rate data defining a relationship between a differential pressure of hydraulic fluid between the first drive circuit and the second drive circuit and a leakage flow rate of the hydraulic fluid in the hydraulic circuit in stalling, and a controller in communication with the storage device. The hydrostatic transmission includes a traveling pump, a hydraulic circuit with first and second drive circuits, and a traveling motor. The controller is configured to determine a target traction force of the work vehicle, determine a target differential pressure that is a target value of the differential pressure from the target traction force, determine the leakage flow rate from the target differential pressure with reference to the leakage flow rate data, and determine a target flow rate of the traveling pump from the leakage flow rate.

A work vehicle includes an engine, a hydrostatic transmission, a storage device storing leakage flow rate data defining a relationship between a differential pressure of hydraulic fluid between the first drive circuit and the second drive circuit and a leakage flow rate of the hydraulic fluid in the hydraulic circuit in stalling, and a controller in communication with the storage device. The hydrostatic transmission includes a traveling pump, a hydraulic circuit with first and second drive circuits, and a traveling motor. The controller is configured to determine a target traction force of the work vehicle, determine a target differential pressure that is a target value of the differential pressure from the target traction force, determine the leakage flow rate from the target differential pressure with reference to the leakage flow rate data, and determine a target flow rate of the traveling pump from the leakage flow rate.

A work vehicle includes an engine, a traveling pump driven by the engine, a hydraulic circuit connected to the traveling pump, a traveling motor connected to the traveling pump via the hydraulic circuit, a rotational speed sensor configured to output a signal indicative of engine speed a hydraulic pressure sensor configured to output a signal indicative of hydraulic pressure of the hydraulic circuit, a controller. The controller receives the signals from the rotational speed sensor and the hydraulic pressure sensor. The controller determines whether the engine is in an over-rotation state based on engine speed. The controller determines an upper limit value of a displacement of the traveling pump based on hydraulic pressure of the hydraulic circuit. The controller limits the displacement of the traveling pump to the upper limit value or less upon determining that the engine is in the over-rotation state.

A machine is disclosed. The machine may include a continuously variable transmission, a location or movement module, and a controller. The controller may receive a first signal indicating a transmission output speed for the machine. The controller may receive, from the location or movement module, a second signal indicating location or movement information of the machine. The controller may determine a traction value based on the first signal and the second signal. The controller may determine a rimpull limit value based on the traction value. The controller may provide the rimpull limit value to the continuously variable transmission, wherein the continuously variable transmission is to determine a transmission output torque of the machine based on the rimpull limit value.

A machine is disclosed. The machine may include a continuously variable transmission, a location or movement module, and a controller. The controller may receive a first signal indicating a transmission output speed for the machine. The controller may receive, from the location or movement module, a second signal indicating location or movement information of the machine. The controller may determine a traction value based on the first signal and the second signal. The controller may determine a rimpull limit value based on the traction value. The controller may provide the rimpull limit value to the continuously variable transmission, wherein the continuously variable transmission is to determine a transmission output torque of the machine based on the rimpull limit value.

By using various feedback data on a sprayer system, such as engine speed, wheel speed, sensed temperatures and/or sensed pressures, an onboard logic controller can be used to fine tune parameters of the driveline system in an automatic calibration process. In one aspect, a controller can drive up engine speed and manipulate electrical current being sent to coils of propel pumps and/or wheel motors as current reaches a point where there is no more change in wheel speed as detected by the system, thereby achieving a. calibration setpoint. Additionally, during the automatic calibration process, the machine as a whole can be monitored with respect to several sensors, such as pressures, temperatures, and the like, so that if any parameter being monitored is out of a predetermined range, the calibration can be stopped and not set.

A slewing hydraulic work machine includes a slewing control device performing a slewing control in accordance with an applied slewing command operation, a boom control device performing a boom-raising control in accordance with an applied boom-raising command operation, a boom angle detector, and a capacity control section. The capacity control section calculates a command motor capacity based on a boom angle, generates a capacity command signal corresponding to the command motor capacity and inputs the signal to a slewing motor. During the performance of slewing and boom-raising operation, the capacity control section sets the command motor capacity to a value equal to or less than a base capacity when the boom angle is equal to or less than a slewing priority angle and sets the command motor capacity to a value greater than the base capacity when the boom angle is greater than the slewing priority angle.

A slewing hydraulic work machine includes a slewing control device performing a slewing control in accordance with an applied slewing command operation, a boom control device performing a boom-raising control in accordance with an applied boom-raising command operation, a boom angle detector, and a capacity control section. The capacity control section calculates a command motor capacity based on a boom angle, generates a capacity command signal corresponding to the command motor capacity and inputs the signal to a slewing motor. During the performance of slewing and boom-raising operation, the capacity control section sets the command motor capacity to a value equal to or less than a base capacity when the boom angle is equal to or less than a slewing priority angle and sets the command motor capacity to a value greater than the base capacity when the boom angle is greater than the slewing priority angle.

A traction force limiting device for a working machine with a continuously variable transmission that comprises a variator for adjusting the rotational speed ratio of the transmission independently of the torque ratio of the transmission. The traction force limiting device has a traction force interface for providing information to determine a traction force of the working machine, a limit value interface for setting a traction force limit value of the working machine and a control interface for emitting a control signal to the variator. Additionally, the traction force limiting device has a computer unit designed, on a basis of information provided via the traction force interface, to determine the traction force, to compare the traction force determined with the traction force limit value set via the limit value interface, and to control the variator in such manner that the traction force does not exceed the traction force limit value.