Seoul, South Korea
Seoul, South Korea

Doosan Group is a South Korean conglomerate company. In 2009, the company was placed 471st in the Fortune Global 500. It has been included in the Forbes Global 2000 companies from 2007. It is the parent company of ŠKODA power. Doosan was ranked 4th among the “World’s Best 40 Companies 2009” list, released in the latest issue of BusinessWeek, the U.S. economics magazine in October 2009. Fortune Global 500 Wikipedia.


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Patent
Doosan Infracore | Date: 2016-08-23

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.


Patent
Doosan Infracore | Date: 2017-02-01

An engine may include a cylinder, an intake valve, a piston, an exhaust valve and a crankshaft. The cylinder may include a cylinder bore. The intake valve may be configured to introduce a fuel and an air into the cylinder bore. The piston may be slidably arranged in the cylinder bore. The piston may be configured to convert an explosive power of an exhaust gas, which may be generated by combusting the fuel, into a linear driving force. The exhaust valve may be configured to exhaust the exhaust gas from the cylinder bore. The crankshaft may be connected with the piston to convert the linear driving force into a rotary driving force. The intake valve and the exhaust valve may be simultaneously opened within a rotation angle of about 3 to about 12 of the crankshaft. Thus, the engine may have improved volumetric efficiency of the engine and fuel efficiency of the engine. Further, the engine may satisfy emission regulations with respect to a CH_(4) gas.


Patent
Doosan Infracore | Date: 2017-04-05

An engine control apparatus includes a temperature sensor configured to detect engine-related temperature information, a first calculator configured to calculate a first limit output value of an engine based on the temperature information inputted from the temperature sensor, an oil pressure sensor configured to detect a pressure of engine oil, a second calculator configured to calculate a second limit output value of the engine based on the oil pressure inputted from the oil pressure sensor, and a determiner configured to determine one of the first and second limit output values inputted from the first and second calculators as an optimal limit output value of the engine.


Heat resistant spheroidal graphite cast iron includes carbon (C) in a range of 3.2 - 3.4 wt%, silicon (Si) in a range of 4.3 - 4.8 wt%, manganese (Mn) in a range of 0.2 - 0.3 wt%, molybdenum (Mo) in a range of 0.8 - 1.0 wt%, vanadium (V) in a range of 0.4 - 0.6 wt%, chrome (Cr) in range of 0.2 - 0.4 wt%, niobium (Nb) in a range of 0.2 - 0.4 wt%, inevitable impurities, and a remainder of iron (Fe) based on a total weight of the heat resistant spheroidal graphite cast iron. The heat resistant spheroidal graphite cast iron further includes barium (Ba) in a range of 0.0045 - 0.0075 wt%. A content ratio of chrome (Cr) and barium (Ba) (Cr/Ba) is in a range from about 26 to about 89. The heat resistant spheroidal graphite cast iron may have an improved high temperature tensile strength.


The present disclosure relates to a method for controlling a swing motor in a hydraulic system and a hydraulic system. The method for controlling the swing motor in the hydraulic system and the hydraulic system according to the exemplary embodiment of the present disclosure may ensure the sufficient amount of hydraulic oil in a make-up line in a situation in which the hydraulic oil needs to be supplementarily supplied to the swing motor in the hydraulic system. Therefore, it is possible to prevent the occurrence of cavitation in the swing motor by stably supplying the amount of hydraulic oil at the point in time where the hydraulic oil needs to be supplementarily supplied to the swing motor. In addition, it is possible to prevent the occurrence of abnormal noise which is harsh to the ear when the cavitation occurs.


In a method of displaying a dead zone of a construction machine, actual images with respect to omnidirectional views of a cabin in the construction machine may be obtained. A virtual image with respect to the dead zone generated by a working tool, which may be connected to the cabin, may be obtained from the actual images. The virtual image may be displayed on a monitor in the cabin. Thus, a worker in the cabin may accurately acknowledge whether a man or a fixture may exist or not in a region in front of a rotation direction of a boom by seeing the virtual image. Thus, a negligent accident caused by the rotation of the boom may be prevented.


Provided are an apparatus and a method for variably 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.


Disclosed are an apparatus and a method for controlling an engine of construction equipment, the apparatus including: a vehicle control unit configured to control construction equipment; a lever configured to generate a first signal when a state of the construction equipment is switched to an operation state or a neutral state; an auto idle switch configured to generate a second signal when an auto engine idle mode is on; an engine configured to generate power; and an engine control unit configured to control the engine by an engine speed command of the vehicle control unit, and generate engine torque information of the engine and provide the generated engine torque information to the vehicle control unit, in which when a state of the lever is switched to a neutral state in an on state of the second signal, the vehicle control unit controls the engine control unit so that an engine speed of the engine is reduced to a step engine speed (RS) corresponding to a first speed reducing step, when the first speed reducing step is maintained for a predetermined time, the vehicle control unit controls the engine control unit so that the engine speed of the engine is further reduced to an idle engine speed (RI) corresponding to a second speed reducing step, and when a state of the lever is switched to an operation state while the second speed reducing step is maintained, the vehicle control unit controls the engine control unit so that the engine speed of the engine is returned to the step engine speed (RS) corresponding to the first speed reducing step.


A control system for construction machinery includes first and second hydraulic pumps connected to an engine, a swing control valve and a first boom control valve installed in a first center bypass line connected to the first hydraulic pump, a second boom control valve installed in a second center bypass line connected to the second hydraulic pump, a shutoff valve installed in a control line through which a boom raising pilot signal pressure is supplied to the first boom control valve and configured to selectively open and close the control line, and a control unit configured to electronically control the shutoff valve according to a manipulation signal, wherein the control unit closes the shutoff valve such that the first boom control valve is shifted to a neutral position when a swing operation priority mode is selected.


Disclosed are a device and a method for controlling a hydraulic pump in a construction machine, the method including: an engine dynamic characteristic change checking step S20 of checking whether a dynamic characteristic of an engine deviates from a predetermined permissible range when a load is applied to the hydraulic pump and a pump load reaches pump torque required by the hydraulic pump; a pump load applying step S40 of when the dynamic characteristic of the engine deviates from the predetermined permissible range in the engine dynamic characteristic change checking step S20, applying a pump load to the hydraulic pump so as to increase the pump torque to predetermined torque with a predetermined change rate; an information collecting step S50 of collecting information including engine speed information, swash plate angle information of the pump, and pressure information of discharged working oil, which is generated when the pump load is applied in the pump load applying step S40; a map data generating step S60 of generating a new torque change rate map 220a by generating a torque change rate for each load section based on the information collected in the information collecting step S50; and an updating step S80 for updating an existing torque change rate map 220 to the new torque change rate map 220a generated in the map data generating step S60, in which the hydraulic pump is controlled by the new torque change rate map 220a updated in the updating step S80.

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