Abstract: A device for use in a work vehicle such as a wheel loader, capable of reliably preventing engine stall due to rapid application of high hydraulic load, without causing problems such as deterioration in fuel efficiency or vehicle performance and waste of energy. When determining that an engine speed detected by the engine speed detecting sensor has been decreased to the threshold value or lower, the controller implements a control to reduce the absorption torque of the variable displacement hydraulic pump. The hydraulic load is thus shifted to a low hydraulic load line. The change of the hydraulic load from the high hydraulic load to the low hydraulic load gives a margin to the current torque of the engine with respect to the low hydraulic load. Consequently, the actual speed of the engine is increased to return onto the regulation line, exceeding the threshold value.

Abstract: A load control device for an engine of a work vehicle that purposes to render the work vehicle, such as a wheel loader or the like, capable of raising a vehicle speed in a short period of time by providing a sufficient traction force when a high traveling load is imposed, without causing degradation of a vehicle body performance, waste of energy, and other problems. The load control device is provided with variable displacement hydraulic pumps (7, 8, 9) being provided with absorption torque changing means (19, 22) for changing absorption torque. A controller (18) determines whether a traveling load is in a high state, and when it has been determined that the traveling load is in the high state, control for lowering the absorption torque for the hydraulic pumps (7, 8, 9) is carried out. This control is carried out, provided, for example, that a “power mode” is selected with the power mode switch (31).

Abstract: A load control device for an engine of a work vehicle that purposes to render the work vehicle, such as a wheel loader or the like, capable of raising a vehicle speed in a short period of time by providing a sufficient traction force when a high traveling load is imposed, without causing degradation of a vehicle body performance, waste of energy, and other problems. The load control device is provided with variable displacement hydraulic pumps (7, 8, 9) being provided with absorption torque changing means (19, 22) for changing absorption torque. A controller (18) determines whether a traveling load is in a high state, and when it has been determined that the traveling load is in the high state, control for lowering the absorption torque for the hydraulic pumps (7, 8, 9) is carried out. This control is carried out, provided, for example, that a “power mode” is selected with the power mode switch (31).

Abstract: A device for use in a work vehicle such as a wheel loader, capable of reliably preventing engine stall due to rapid application of high hydraulic load, without causing problems such as deterioration in fuel efficiency or vehicle performance and waste of energy. When the operator rapidly operates the loader operating lever to the raising direction while operating the steering handle, the hydraulic load in the steering hydraulic pump and the loader hydraulic pump is increased rapidly. The hydraulic load is thus shifted to a high hydraulic load line. Therefore, the engine tries to raise the torque to match the same with the high hydraulic load. However, the increase of the engine torque cannot keep up with the rapid increase of the hydraulic load (time delay occurs), resulting in that the actual speed of the engine becomes a threshold value or lower.

Abstract: A load control device for an engine of a work vehicle that purposes to render the work vehicle, such as a wheel loader or the like, capable of raising a vehicle speed in a short period of time by providing a sufficient traction force when a high traveling load is imposed, without causing degradation of a vehicle body performance, waste of energy, and other problems. The load control device is provided with variable displacement hydraulic pumps (7, 8, 9) being provided with absorption torque changing means (19, 22) for changing absorption torque. A controller (18) determines whether a traveling load is in a high state, and when it has been determined that the traveling load is in the high state, control for lowering the absorption torque for the hydraulic pumps (7, 8, 9) is carried out. This control is carried out, provided, for example, that a “power mode” is selected with the power mode switch (31).

Abstract: A display device that has a display screen is disclosed that has the ability to prevent reflections of the display screen from appearing on glass, without lowering the visibility of a display portion of the display screen. The brightness of the display color of either the background portion 31 on a display screen 30 or the background portion 31 of such one of display portions 32 and 33 as occupies the larger area of the lit portion of the display screen 30 is changed according to the control of a control switch 23. If the brightness of the display color of the background portion 31 is lowered (from the “thin light blue” to the “thick light blue”, for example) at the nighttime, its reflection on the glass around a cabin 40 can be reduced without lowering the luminance of the display screen 30. Alternatively, the saturation or hue of the display color can be changed to obtain a similar effect.

Abstract: To prevent a display screen from being reflected on glass shields, without lowering the visibility of a display portion.