Abstract: An exemplary embodiment of the present disclosure relates to a construction machine starting assist system including: an engine of a construction machine; an input unit which receives a key-on signal and a key-off signal of the engine; a hydraulic pump which is operated by the engine; an actuator which is operated by hydraulic oil discharged from the hydraulic pump; a regeneration valve which is switched so that a part or an entirety of the hydraulic oil returned from the actuator; an accumulator which is charged with the hydraulic oil supplied from the regeneration valve; a charging valve which is controlled so that the hydraulic oil is discharged from the accumulator when the key-on signal is inputted into the input unit; and a hydraulic motor connected to the engine and configured to assist in starting the engine.

Abstract: The present disclosure relates to a safety system for a construction machine, and the safety system for a construction machine according to the exemplary embodiment of the present disclosure includes: a pilot pump which supplies a pilot working fluid; multiple spools which are operated by the pilot working fluid to control a supply of a main working fluid and each have a signal unit formed in one region thereof; a signal line which sequentially connects the pilot pump and the signal units of the multiple spools and discharges the pilot working fluid, which is supplied by the pilot pump, to a hydraulic tank; and a pressure sensor which measures pressure in the signal line.

Abstract: Provided are an apparatus and a method for controlling spool displacement of a construction machine, which are capable of improving regeneration efficiency of the construction machine, and improving a fuel efficiency characteristic of the construction machine by reducing pressure loss in the operating mode by adjusting the quantity of spool displacement in a regeneration mode when a current pressure of a main pump is less than a predetermined operating pressure, and determining whether the construction machine is in an operating mode or the regeneration mode in real time according to an operating angle of a joystick and the current pressure of the main pump when the current pressure of the main pump is greater than or equal to the predetermined operating pressure to variably change the quantity of spool displacement in the operating mode.

Abstract: The present disclosure relates to a control device and a control method for a construction machine. The control device and the control method for the construction machine according to the exemplary embodiment of the present disclosure may adjust an engine revolutions per minute (rpm) according to a load applied to the construction machine, thereby controlling an output of equipment. In the control device and the control method for the construction machine according to the exemplary embodiment of the present disclosure, an output of a pump is increased at an appropriate time, so that good operation performance may be maintained, and in the case of an operation pattern, in which a load is low, the engine rpm is adjusted to be decreased, thereby improving fuel efficiency.

Abstract: A hydraulic control apparatus for construction machinery, includes an accumulator to accumulate a high-pressure hydraulic oil discharged from a boom cylinder for driving a boom of the construction machinery, a hydraulic pump connected to the accumulator and driven by the high-pressure hydraulic oil, a pressure sensor configured to detect a pressure of the accumulator, and a control unit connected to the accumulator and the hydraulic motor and configured to control operations of the accumulator and the hydraulic motor, and having a determiner that receives a pressure value of the accumulator and number of revolution of the hydraulic motor to determine whether or not the hydraulic motor fails when the hydraulic oil accumulated in the accumulator is supplied to the hydraulic motor.

Abstract: A hydraulic system for construction machinery includes a boom cylinder, a main control valve including a boom control spool that is configured to selectively supply a hydraulic oil from a hydraulic pump to a boom head chamber and a boom rod chamber of the boom cylinder, a regeneration device connected to the boom head chamber of the boom cylinder through a hydraulic regeneration line, a regeneration valve unit installed in the regeneration line, and a control unit connected to the main control valve and the regeneration valve unit, wherein in a boom down low speed mode the hydraulic oil is drained through the regeneration device to lower the boom at a first speed, and in a boom down high speed mode the hydraulic oil is drained through the regeneration device and the main control valve to lower the boom at a second speed greater than the first speed.

Abstract: A control system for construction machinery includes a main control valve installed in a hydraulic line between a hydraulic pump and actuators, and including a first group of electro proportional pressure reducing valves outputting a secondary pressure in proportion to an external pressure command signal to a first spool for controlling a first group of actuators of the actuators, and a second group of electro proportional pressure reducing valves outputting a secondary pressure in proportion to an external pressure command signal to a second spool for controlling a second group of actuators of the actuators, a first pressure sensor configured to detect the secondary pressure outputted from the first group of electro proportional pressure reducing valves and a second pressure sensor configured to detect the secondary pressure outputted from the second group of electro proportional pressure reducing valves, and a controller configured to output pressure command signals to the electro proportional pressure redu

Abstract: The present invention relates to a control device and control method for a construction machine. A control device and control method for a construction machine according to the embodiments of the present invention can determine a need for the operation of the alternator by taking into account required electrical energy and the current charge amount of a battery when auxiliary power is received from the auxiliary power device, and can thus decrease an engine RPM in a situation in which power generation is not required, thereby improving the fuel efficiency of a construction machine.

Abstract: A cooling device for a reducing agent injection module, includes a reducing agent injection module installed in an exhaust pipe to inject a reducing agent into the exhaust pipe and having a module cooling channel therein through which a coolant flows to cool the reducing agent injection module, a coolant pump configured to supply the coolant to the module cooling channel, a coolant circulation line including a coolant supply line and a coolant recovery line to connect the coolant pump and the module cooling channel, and a coolant recovery portion installed in the coolant recovery line to store the coolant flowing through the reducing agent injection module and positioned higher than the reducing agent injection module along a gravitational direction.

Abstract: In a load weighing method for a wheel loader, an inclined angle of a ground surface on a slope where the wheel loader is working is detected. A change in a boom angle and a change in a pressure of a boom cylinder are detected while pivoting the boom and an attachment connected to the boom when a load is placed on the attachment. Weight of the load is calculated using the inclined angle of the ground surface, the change in the boom angle, and the change in the pressure of the boom cylinder as variables of a rotational dynamic equation for the pivot of the boom.

Abstract: A control system for construction machinery includes a first hydraulic pump, first and second actuators connected to the first hydraulic pump through first and second hydraulic lines respectively, first and second control valves installed in the first and second hydraulic lines respectively and configured to control operations of the first and second actuators, and a controller configured to adjust a spool displacement amount of the first control valve according to an amount of working oil to be supplied to the first actuator when the first actuator performs a single or multiple operation by self-load.

Abstract: The present invention relates to an apparatus and method for controlling a construction machine. An apparatus for controlling a construction machine according to an embodiment of the present invention may compare a fuel efficiency gain expected when engine revolutions per minute (RPM) is decreased with a fuel efficiency gain expected when a current torque curve is changed to a torque curve corresponding to a condition in which auxiliary power is provided and selected from among the plurality of torque curves and then the latter torque curve is selectively applied, based on the fuel efficiency map, and may control an engine by means of a method by which a larger fuel efficiency gain is expected.

Abstract: The present disclosure relates to a hydraulic circuit system for forced regeneration of a diesel particulate filter, and more particularly, to a hydraulic circuit system for forced regeneration of a diesel particulate filter (DPF), which prevents a working machine from being operated when the diesel particulate filter is forcedly regenerated by combusting particulate matters (PM) in a case in which the diesel particulate filter is installed in a construction machine with a diesel engine and particulate matters contained in exhaust gas are collected in the diesel particulate filter.

Abstract: The present specification relates to a system and a method for preventing overheating of an axle in a construction equipment. A system for preventing overheating of an axle in a construction equipment is mounted in the construction equipment and transmits driving power of an engine to a wheel, and the system includes: a brake pedal; a brake sensor which detects displacement of the brake pedal when the brake pedal is manipulated by an operator; an exhaust brake which is mounted in the engine and operates and controls an opening degree of an exhaust gas discharge passageway of the engine; and a control unit which adjusts the opening degree of the exhaust gas discharge passageway by controlling the exhaust brake corresponding to the displacement of the brake pedal when manipulation of the brake pedal is detected by the brake sensor.

Abstract: An exhaust gas post-processing system according to an embodiment of the present invention includes: an exhaust flow path for moving an exhaust gas discharged from an engine; at least one aftertreatment device installed on the exhaust flow path and purifying the exhaust gas; a burner installed on the exhaust flow path and heating the exhaust gas upstream of the at least one aftertreatment device; a fuel supplier for supplying a fuel to the burner; and an air supply flow path for supplying an air to the burner. The air supply flow path supplies a part of the exhaust gas discharged from the engine as the air to the burner.

Abstract: A dust preventing seal may include a body and first and second dust lips. The body may be installed at a locking portion between an arm and a bucket of a construction machine. The body may have an annular shape. The first and second dust lips may be protruded from an outer surface of the body to the outside.

Abstract: A hydraulic system for construction machinery comprises a regeneration valve unit including a first opening/closing valve installed in a first hydraulic line which connects a head-side chamber of a boom cylinder and a drain tank, to open and close the first hydraulic line, and a second opening/closing valve installed in a second hydraulic line which is branched from the first hydraulic line and is connected to a rod-side chamber of the boom cylinder, to open and close the second hydraulic line, a first check valve installed in the second hydraulic line between the rod-side chamber and the regeneration valve unit and configured to selectively drain a working oil discharged from the rod-side chamber to the drain tank, and a control unit configured to control opening and closing of the first opening/closing valve, the second opening/closing valve and the first check valve according to a control mode.

Abstract: A power apparatus including a reducing agent supply control system includes: an engine configured to emit exhaust gas containing nitrogen oxide by burning air and fuel at a preset air-fuel ratio; an exhaust passage configured such that the exhaust gas emitted by the engine moves therethrough; a pressure sensor configured to actually measure the pressure of air which is supplied to the engine; a nitrogen oxide concentration sensor installed on the exhaust passage, and configured to measure the nitrogen oxide (NOx) concentration of the exhaust gas; a reducing agent supply unit configured to supply a reducing agent to the exhaust gas which moves along the exhaust passage; and a control unit configured to determine the amount of reducing agent to be supplied based on information received from the pressure sensor and the nitrogen oxide concentration sensor, and to control the reducing agent supply unit.

Abstract: In a method of controlling a main control valve of an excavator, when speeds of a boom cylinder and an arm cylinder is increased by handling a boom joystick and an arm joystick, a second arm control spool between a first hydraulic pump and the arm cylinder may be closed. A first boom control spool between the first hydraulic pump and the boom cylinder may be opened to supply a first flux generated from the first hydraulic pump to the boom cylinder. A second boom control spool between a second hydraulic pump and the boom cylinder may be closed. A first arm control spool between the second hydraulic pump and the arm cylinder may be opened to supply a second flux generated from the second hydraulic pump to the arm cylinder.