A hydrostatic transmission system includes a fluid-driven motor and an integrated pump assembly connected to the fluid-driven motor to provide fluid to operate the fluid-driven motor. The integrated pump assembly includes a pump with at least one fluid driver comprising a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from a first port of the pump to a second port of the pump. The pump assembly also includes two valve assembles to isolate the pump from the system. The hydrostatic transmission system also includes a controller that establishes at least one of a speed and a torque of the at least one prime mover to exclusively adjust at least one of a flow and a pressure in the hydrostatic transmission system to an operational set point.

A hydrostatic transmission system includes a fluid-driven motor and an integrated pump assembly connected to the fluid-driven motor to provide fluid to operate the fluid-driven motor. The integrated pump assembly includes a pump with at least one fluid driver comprising a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from a first port of the pump to a second port of the pump. The pump assembly also includes two valve assembles to isolate the pump from the system. The hydrostatic transmission system also includes a controller that establishes at least one of a speed and a torque of the at least one prime mover to exclusively adjust at least one of a flow and a pressure in the hydrostatic transmission system to an operational set point.

A method for controlling the acceleration of a vehicle includes: receiving a demand for acceleration from an operator input device; applying an initial transmission ratio to provide a vehicle acceleration whilst maintaining a current engine speed; and applying a loading transmission ratio to increase the output from the engine, wherein the loading transmission ratio is determined using the vehicle acceleration.

A method for controlling the acceleration of a vehicle includes: receiving a demand for acceleration from an operator input device; applying an initial transmission ratio to provide a vehicle acceleration whilst maintaining a current engine speed; and applying a loading transmission ratio to increase the output from the engine, wherein the loading transmission ratio is determined using the vehicle acceleration.

A loading vehicle is capable of improving work efficiency by adjusting engine rotational speed with high accuracy in accordance with an operation state of the working device. An HST traveling driven wheel loader has an electrically controlled HST pump. A controller is configured to control input torque of the HST pump 31 and solenoid proportional pressure reducing valve is configured to generate control pressure for controlling displacement volume of the pump based on a control signal from the controller. The controller is configured to calculate the displacement volume q of the HST pump based on discharge pressure Pf of a loading hydraulic pump so that maximum input torque Thst of the HST pump decreases as the discharge pressure Pf or input torque of the loading hydraulic pump increases, and output a control signal corresponding to the calculated displacement volume q to the solenoid proportional pressure reducing valve.

A pump, including: a cylinder block including two through-bores and two pistons disposed in the through-bores; a drive shaft to rotate the cylinder block; a swash plate to displace the pistons within the through-bores to draw fluid through an inlet port into the through-bores; and expel the fluid from the through-bores into the outlet port; a torque sensor arranged to measure torque on the drive shaft and transmit a torque signal, including the measured torque, to a processor; and an actuator to receive, from the processor, a control signal generated using the torque signal and pivot the swash plate about a first axis, transverse to the axis of rotation, or maintain a circumferential position of the swash plate about the first axis; or pivot the cylinder block about a second axis, transverse to the axis of rotation, or maintain a circumferential position of the cylinder block about the second axis.

A pump, including: a cylinder block including two through-bores and two pistons disposed in the through-bores; a drive shaft to rotate the cylinder block; a swash plate to displace the pistons within the through-bores to draw fluid through an inlet port into the through-bores; and expel the fluid from the through-bores into the outlet port; a torque sensor arranged to measure torque on the drive shaft and transmit a torque signal, including the measured torque, to a processor; and an actuator to receive, from the processor, a control signal generated using the torque signal and pivot the swash plate about a first axis, transverse to the axis of rotation, or maintain a circumferential position of the swash plate about the first axis; or pivot the cylinder block about a second axis, transverse to the axis of rotation, or maintain a circumferential position of the cylinder block about the second axis.

A hydraulic pump is driven by an engine. A hydraulic motor is driven by hydraulic fluid discharged from the hydraulic pump thereby causing a vehicle to travel. A controller controls a rotation speed of the engine and a displacement of the hydraulic pump. The controller acquires a tractive force of the vehicle. The controller changes the rotation speed of the engine to a low speed side in accordance with a reduction in the tractive force.

To improve working efficiency in an eco mode when a power mode and the eco mode have been set in a wheel loader, the wheel loader is provided with a controller having an eco mode characteristic line, a power mode characteristic line, and a lifting operation characteristic line having a matching point C located between a matching point A between a working device operating engine torque characteristic line and the eco mode characteristic line and a matching point B between the working device operating engine torque characteristic line and the power mode characteristic line. The controller includes a control portion, which controls a HST pump in accordance with the lifting operation characteristic line when lifting operation of a lift arm is detected while the eco mode has been selected by a work mode selecting portion.

To improve working efficiency in an eco mode when a power mode and the eco mode have been set in a wheel loader, the wheel loader is provided with a controller having an eco mode characteristic line, a power mode characteristic line, and a lifting operation characteristic line having a matching point C located between a matching point A between a working device operating engine torque characteristic line and the eco mode characteristic line and a matching point B between the working device operating engine torque characteristic line and the power mode characteristic line. The controller includes a control portion, which controls a HST pump in accordance with the lifting operation characteristic line when lifting operation of a lift arm is detected while the eco mode has been selected by a work mode selecting portion.