An automatic dump control system and method are disclosed for a loader having a boom and a bucket each positionable by hydraulic cylinders actuated by a hydraulic circuit. The control system includes a source of image data of a receptacle and a source of position data for the boom and the bucket. The control system includes a controller that: determines a height of the receptacle based on the image data; determines a difference between the height of the receptacle and a height of the bucket based on the position data; outputs one or more control signals to the hydraulic circuit to position at least one of the boom and the bucket at a target height above the receptacle; determines that the bucket is positioned over the receptacle; and outputs one or more control signals to the hydraulic circuit to dump a load in the bucket into the receptacle.

In a hydraulic driving system for construction machines, when track motors 3f and 3g are operated and the delivery pressure of a main pump 2 increases to a second value PS2 of the set pressure of a main relief valve 14, the set pressure of a signal pressure relief valve 16 increases from a third value PA1 to a fourth value PA2, which is smaller than the second value PS2 of the set pressure of the main relief valve 14, the difference between the second value PS2 and the fourth value PA2 being smaller than the target LS differential pressure. With such a structure, even if one of actuators reaches the stroke end and the delivery pressure of the hydraulic pump rises to the set pressure of the main relief valve, the other actuators do not stop, and further when the main relief valve is configured to increase the set pressure during operation of a specific actuator, the load pressure of the specific actuator does not increase to the increased set pressure of the main relief valve.

The present invention relates to a power transmission arrangement for a construction vehicle, comprising an engine, a hydraulic power system for powering work hydraulics of the construction vehicle, which is feedable with power from the engine, the hydraulic power system including a power limiter for limiting the power supply of the engine to the hydraulic power system to different power limit values, a drivetrain power system for powering locomotion of the construction vehicle, the drivetrain power system being feedable with power from the engine, a determining device for determining an operational state of the construction vehicle, and a controller configured to control the power limiter to limit the power supply of the engine to the hydraulic power system to different power limit values, these power limit values being set depending on the operational state of the construction vehicle determined by the determining device. Furthermore, the present invention relates to a construction vehicle including such a power transmission arrangement and a method of controlling such a power transmission arrangement.

A monitoring system of a working machine including a first wireless communicator arranged at and/or around a storage area of the working machine, a second wireless communicator arranged on the working machine and configured to communicate with the first wireless communicator in wireless, and a monitor to watch the working machine having the second wireless communicator when a signal intensity of radio wave received from the second wireless communicator by the first wireless communicator is equal to or more than a threshold intensity.

Systems and methods are disclosed for managing task assignments for a plurality of work machines at a site. An assignment engine may: receive first state data for a work machine including historical data, operating condition, and location data, and second state data for the site including characteristic data for materials and a plurality of available tasks; predict performance data and energy consumption data of the work machine for a task; select a task for the work machine by inputting first state data and second state data into a trained reinforcement-learning model, wherein: the model has been trained to learn an assignment policy that optimizes a reward function such that the learned policy selects a task for at least one work machine from the plurality of tasks available at the site; and cause the at least one work machine to be operated according to the at least one task assignment.

A vehicle traction control system for a vehicle includes a prime mover, at least one wheel for providing tractive effort on a support surface, and a ground-engaging implement moveable relative to the support surface. The traction control system also includes a controller operable to monitor wheel slip of the at least one wheel. The controller is operable to move the ground-engaging implement at a rate proportional to an amount of wheel slip.

A hydraulic excavator (1) includes a wireless authentication device (42) performing wireless authentication with a portable key device (41) and a vehicle body controller (39) allowing or prohibiting start of the engine (15) on the basis of authentication by the wireless authentication device (42) and an operation of a power switch (12). The wireless authentication device (42) transmits a request signal within an authenticable range and performs authentication when it receives an ID code for authentication replied from the portable key device (41) on the basis of the transmitted request signal. The vehicle body controller (39) allows start of the engine (15) by the power switch (12) when a gate lock lever (13) is switched to a lock position and the wireless authentication device (42) performs authentication by the portable key device (41).

A hybrid power train system for a tractor scraper is provided. The hybrid power train system may include a primary power source coupled to a first set of traction devices, a generator coupled to the primary power source, a first electric motor coupled to a second set of traction devices, an inverter circuit coupled to the generator and the first electric motor, an energy storage device coupled to the inverter circuit, and a controller operatively coupled to the inverter circuit. The controller may be configured to engage a first operation mode enabling electrical energy, supplied by the generator and the first electric motor, to be stored in the energy storage device, and engage a second operation mode enabling electrical energy, stored in the energy storage device, to be supplied to the first electric motor to drive the second set of traction devices.

A work vehicle includes a drive unit, a fan motor, a fan configured to be driven by the fan motor, an overrun state detecting unit configured to detect an overrun state of the drive unit, and a control unit. The control unit is configured to control a rotational speed of the fan to reach a first fan rotational speed by increasing the rotational speed of the fan when a detection value detected by the overrun state detecting unit becomes greater than or equal to a first threshold. The control unit is configured to control the rotational speed of the fan to reach a second fan rotational speed higher than the first fan rotational speed when the detection value becomes greater than or equal to a second threshold greater than the first threshold.

Provided is a pump diagnostic device and construction machine capable of performing precise and accurate diagnosis. A diagnostic device 40 for a hydraulic pump 1 includes an action instruction section 42 that outputs an action instruction for causing a hydraulic actuator 29 of a hydraulic excavator 200 to perform a specific action, a measurement condition setting section 44 that sets a sampling condition in measurement of a pressure of the hydraulic pump 1 during the specific action, a calculation section 46 that acquires a measured value of the pressure sampled during the specific action under the set sampling condition, and calculates a pressure pulsation amplitude of the hydraulic pump 1, an anomaly determination section 47 that determines whether there is an anomaly in the hydraulic pump 1 based on the calculated pressure pulsation amplitude, and an output section 48 that outputs a determination result obtained by the anomaly determination section 47.