A wheeled work vehicle includes: a transmission transmitting the rotational power of a traveling hydraulic motor to wheels; a traveling control valve having an interruption position that interrupts supply of hydraulic fluid from a hydraulic pump to the traveling hydraulic motor; a shift changeover valve that shifts the speed stage of the transmission by the position of the shift changeover valve being selectively switched; and a controller that controls the traveling control valve and the shift changeover valve. The controller switches the traveling control valve to the interruption position, then switches the position of the shift changeover valve such that the speed stage of the transmission is shifted to the low speed stage, and switches the traveling control valve from the interruption position to an original position side before the switching in a case where the controller shifts the transmission from the high speed stage to the low speed stage.

A working machine has a frame, a ground engaging propulsion system, a drive arrangement for providing motive power to the ground engaging propulsion system, an operator platform pivotally connected to the frame and moveable between a deployed position for supporting an operator thereon and a stowed position; and a sensor arrangement configured to sense when an external force is applied to the operator platform when said operator platform is in the deployed position. The machine prevents movement of the ground engaging propulsion system when the sensor arrangement does not sense an external force applied to the operator platform when said operator platform is in the deployed positon.

A work machine comprising a power conversion system, a ground-engaging mechanism, a traveling body, a moveable structure, a user input, and a controller. The traveling body is coupled to the ground-engaging mechanism which is controllable to move the traveling body relative to the ground surface. The movable structure has an actuator controllable to move the movable structure relative to the traveling body wherein the actuator receives power through the power conversion system. The user input generates a user input signal. The sensor generates a sensory signal. A controller with a processor thereon is operable to execute a position control algorithm to receive a user input signal; receive a sensor signal, determine a position of the movable structure relative to the traveling body; and responsively control the power conversion system to control the ground-engaging mechanism or the actuator to avoid interference of a boundary limit with an object sensed.

A work machine having a traveling body, a moveable structure coupled to the traveling body, a sensor operable to generate a sensory signal, and a controller. The controller is in communication with the sensor. The controller including a processor and a memory having a position control algorithm stored thereon. The processor is operable to execute the position control algorithm to receive a boundary command establishing a defined boundary; receive a sensory signal from the sensor related to the movement of the movable structure; determine a position of the movable structure relative to the traveling body; and limit movement of one of the ground-engaging mechanism of the traveling body or the actuator of the moveable structure as the traveling body moves along the travel path when the position of the movable structure is within an allowable distance from the defined boundary.

A work machine control system includes an operational input portion that accepts an input operation to change a position of acceptance, maintains the position of acceptance when there is no input operation accepted, and provides an operation command in accordance with change in position of acceptance, an operational force providing portion that provides a plurality of operational forces in correspondence with an amount of change of the position of acceptance, a transmission portion that changes a speed of rotation provided from a drive source to transmit resultant rotation to a drive wheel, and a controller that controls the transmission portion based on a travel speed of the drive wheel in accordance with the operation command.

A work machine includes an engine, a travel drive system, a work implement, an apparatus drive system with a hydraulic pump, an accelerator operating member, a work implement operating member, and a controller. The controller controls the apparatus drive system in accordance with an operating amount of the work implement operating member. The controller determines a target tractive force of the travel drive system based on an operating amount of the accelerator operating member. The controller determines an allowable acceleration of the work machine. The controller determines an upper limit of tractive force of the travel drive system based on the allowable acceleration. The controller corrects the target tractive force so as to be equal to or less than the upper limit when the target tractive force is greater than the upper limit. The controller controls the travel drive system based on the corrected target tractive force.

A work vehicle controls an engine output based on an accelerator operation amount and a work equipment operation amount. A control device for the work vehicle includes an acceleration correction unit, a target vehicle speed determination unit, and a deceleration correction unit. The acceleration correction unit obtains a corrected accelerator operation amount by correcting the accelerator operation amount based on an inching operation amount. The target vehicle speed determination unit determines a target vehicle speed based on the corrected accelerator operation amount and a signal based on an operation of a shift operation member. The deceleration correction unit corrects the target vehicle speed based on the inching operation amount.

A method of controlling a drive device of a construction machine with a split transmission, which is at least coupled, at an input side, to a drive force source and, on the output side, with a drive range change transmission so as to set at least two shiftable drive ranges. The method includes a detection step (S1) for detecting drive dynamic requests for operation of the construction machine and a determination step (S2) for determining whether a drive dynamic request with an increased drive dynamic is present. If a drive dynamic request with increased drive dynamics is determined, then a shifting step (S4) is executed for shifting the drive range change transmission from a second, of the at least two drive ranges, to a first of the at least two drive ranges, to achieve increased driving dynamics of the construction machine.

A drive assembly for a work vehicle includes an electric machine input arrangement with a first electric machine configured to generate a first source of power, an electric machine input gear assembly configured to receive the first source of power from the first electric machine, and a second electric machine configured to generate a second source of power. The drive assembly further includes a combination gear arrangement coupled to selectively receive the first source of power from the electric machine input gear assembly and the second source of power from the second electric machine to produce a combined power; and an electric machine output arrangement configured to receive and transfer the combined power from the combination gear arrangement.

A control device of a work vehicle includes a braking force function determination unit and a required braking force function determination unit. The braking force function determination unit determines at least one of an offset and an inclination for a required braking force in a braking force function which indicates a relationship between a rotational speed of an output shaft of a transmission and the required braking force and in which the required braking force monotonically increases with respect to the rotational speed such that the smaller a stage number of a selected speed stage which is input into a traction force instruction device, the larger an absolute value of at least one of the offset and the inclination. The required braking force function determination unit determines the required braking force based on the rotational speed of the output shaft of the transmission and the braking force function.