A cargo vehicle includes a hydraulic pump driven by an engine, a cargo handling apparatus operated by hydraulic oil from the hydraulic pump, a cargo operating unit for performing an instruction operation to operate the cargo handling apparatus, an electromagnetic proportional control valve disposed between the hydraulic pump and the cargo handling apparatus, a valve controller that controls the electromagnetic proportional control valve depending on an operation state of the cargo operating unit, and a revolution detector that detects a revolution of the engine, wherein the valve controller controls the electromagnetic proportional control valve such that an opening degree of the electromagnetic proportional control valve is limited for a certain time when the revolution of the engine detected by the revolution detector is lower than a predetermined value.

An engine idle control method of an off highway vehicle. The method including the steps of: detecting a static load on the engine; detecting a dynamic load on the engine; determining if the static load is below a predetermined static level; determining if the dynamic load is less than a predetermined range; and engaging an auto-idle feature dependent upon both of the determining steps being true.

A hydrostatic drive includes a hydraulic machine, a hydraulic adjusting device, a high-pressure accumulator, an accumulator-closing valve, and an electronic control unit. The hydraulic machine has a swept volume that is adjustable via the hydraulic adjusting device from a maximum positive swept volume to a maximum negative swept volume via a zero swept volume. The hydraulic machine is operated as a pump with positive swept volume and as a motor with negative swept volume. The high-pressure accumulator supplies the hydraulic machine with pressure medium for operation as a motor via a pressure line. The accumulator-closing valve has a first position and a second position and is arranged in the pressure line. A fluidic connection from the high-pressure accumulator to the hydraulic machine is open in the first position and closed in the second position. The accumulator-closing valve is actuated in accordance with signals from the electronic control unit.

An electric or hybrid working machine includes a ground engaging structure, an electrical source of power, an electric motor arrangement, one or more hydraulically actuated devices, and a hydraulic pump configured to supply hydraulic fluid to the one or more hydraulically actuated devices. The working machine also includes a transmission operable to transmit drive from the electric motor arrangement to the ground engaging structure and the hydraulic pump. The transmission has a first input member connected to a first electric motor, a drive train comprising a first input gear connected to the first input member, and a coupling device connected between the first input member and the first input gear to selectively adjust transmission of drive to the hydraulic pump and the ground engaging structure.

A regeneration control hydraulic system for an excavator, including at least one hydraulic pump, an actuator, a regeneration oil path, and a regeneration cut-off oil path. The regeneration oil path is configured to send a return oil as a regeneration oil to a cavity having a negative pressure of the actuator. The regeneration oil path is provided with a regeneration valve and a first control valve. The first control valve is configured to control the regeneration oil to enter the cavity having the negative pressure of the actuator when a working device of the excavator retracts inwards, or to control the oil to be discharged from the actuator to the regeneration cut-off oil path when the working device swings outwards. The regeneration cut-off oil path is configured to send the regeneration oil passing through the regeneration valve or the oil discharged from the actuator to other destinations.

A control system is provided for a work vehicle having a powertrain and at least one implement configured to engage with a material during a dig operation. The control system includes a power source; a transmission configured for selective engagement to transfer the power from the engine and the motor to drive an output shaft of the powertrain of the work vehicle; and a controller. The controller has a processor and memory architecture configured to: receive at least one operational parameter of the work vehicle; evaluate the at least one operational parameter to determine if the at least one operational parameter satisfies a dig preparation condition; and generate, upon satisfying the dig preparation condition, at least one dig preparation command for at least one of the transmission and the engine to prepare the powertrain for the dig operation prior to the at least one implement engaging the material.

A working machine includes a prime mover, a traveling pump driven by a power of the prime mover to deliver operation fluid, a traveling motor rotated by the operation fluid delivered from the traveling pump to have a rotation speed stage shiftable between a first speed stage and a second speed stage higher than the first speed stage, a traveling switching valve shiftable between a first state where the rotation speed stage of the traveling motor is set to the first speed stage and a second state where the rotation speed stage of the traveling motor is set to the second speed stage, an actuation valve configured to change a pilot pressure of a pilot fluid to control a flow of operation fluid delivered from the traveling pump, and a controller configured to control the pilot pressure of the pilot fluid output from the actuation valve so that a value of the pilot pressure differs depending on whether the set rotation speed stage of the traveling motor is the first speed stage or the second speed stage.

A work machine capable of saving works by an operator during traveling is provided. The work machine includes a vehicular main body including a traveling unit, a work implement attached to the vehicular main body, and a controller that automatically controls operations by the work implement. The controller cancels automatic control of operations by the work implement based on a traveling state of the traveling unit.

An infrared light-transmitting system for determining the position (e.g., angle and extension) of a boom is provided. The system includes a vehicle with wheels or a track that move the cab. A chassis or frame supports the cab and boom. In various embodiments, the boom extends and rotates; for example, the boom can rotate in 1 or 2 dimensions. The boom interconnects the chassis at the first end to the attachment at the second end. At least one pivot couples the boom to the chassis to rotate the boom about the pivot relative to the chassis. A transmitter emits infrared light signals that are reflected off a reflector to a detector to determine the real-time position of the attachment and/or boom.

The invention relates to a load-handling vehicle (1) comprising a wheeled chassis (2) and, supported by said chassis (2),—an internal combustion engine (4),—a mechanism (5) for transmitting power from the internal combustion engine (4) to the wheels (3) of the chassis (2),—a bucket (7),—a system for moving said bucket (7),—a control unit (9),—an accelerator pedal (10),—a control member (11) which can be manually actuated by the driver of the vehicle,—a system (12) for detecting movements of the bucket (7). The power transmission mechanism (5) is configured so that a reduction in the rotational speed of the internal combustion engine (4) results in a reduction in the torque supplied to the wheels (3) of the chassis (2) and the vehicle (1) comprises at least one operating mode in which the control unit (9) is configured, in accordance with the data provided by the system (12) for detecting the movements of the bucket (7) and the control instructions of the system for moving the bucket (7), to reduce the rotational speed of the engine (4) to a value lower than the set value for speed control corresponding to the position of the accelerator pedal (10).