Patent application number | Description | Published |
20100199730 | ANTITHEFT SYSTEM AND METHOD FOR CONSTRUCTION EQUIPMENT - An antitheft system and method for construction equipment is disclosed. The antitheft system and method can prevent the construction equipment from driving if a driver gets out of a cabin in the state in which an ignition is turned on so as to preheat a heater or engine or in a case where a driving unit is not manipulated during a predetermined period. | 08-12-2010 |
20100204873 | CONSTRUCTION EQUIPMENT INCLUDING REAR VIEW CAMERA - Construction equipment including a hydraulic pump driven by an engine, a lower driving structure, an upper swing structure swingably mounted on the lower driving structure, a working device mounted on the upper swing structure and having a boom, an arm, and a bucket respectively driven by a hydraulic cylinder is disclosed. The construction equipment comprises a rear view camera to permit a driver to view rearward traffic conditions. | 08-12-2010 |
20110028268 | SYSTEM AND METHOD FOR CONTROLLING ENGINE REVOLUTIONS FOR HYBRID CONSTRUCTION MACHINE - A system and method for controlling engine revolutions for a hybrid construction machine is provided. The system for controlling engine revolutions for a hybrid construction machine, including an engine, a hydraulic pump which is driven by the engine to drive a hydraulic actuator with discharged hydraulic fluid, a motor-generator which is driven by the engine to generate electricity and to drive the hydraulic pump as a motor supplementing the engine, an energy storage device which is charged with electric energy generated by the motor-generator and which supplies the electric energy for motor operation of the motor-generator, a torque detection means for detecting an output torque of the hydraulic pump that is required to drive the hydraulic actuator, and a hybrid control means for controlling the motor operation of the motor-generator so as to supplement the engine output if the change of the output torque of the hydraulic pump detected by the torque detection means exceeds a predetermined level and it is determined that an engine revolution drop will occur. | 02-03-2011 |
20110154815 | SWING MOTOR CONTROL METHOD IN OPEN CENTER TYPE HYDRAULIC SYSTEM FOR EXCAVATOR - A swing motor control method in an open center type hydraulic system for a hydraulic excavator is provided, which can adjust the speed of a swing motor so that a swing device and a working device harmonize with each other according to a discharge pressure of a hydraulic pump during a multifunctional work of the working device and the swing device. The swing motor control method in an open center type hydraulic system for an excavator including first and second hydraulic pumps, a swing motor, a working device actuator including a boom or arm actuator, a working device control valve controlling a start, a stop, and a direction change of the working device actuator, a discharge pressure sensor sensing the discharge pressure of the second hydraulic pump, and a swing motor controller controlling a speed of the swing motor in accordance with the pressure detected by the discharge pressure sensor, includes controlling the speed of the swing motor during a multifunctional operation of the swing device and the working device, comparing the pressure detected by the hydraulic pump discharge pressure sensor with a preset pump discharge pressure, and controlling a limiting speed of the swing motor in accordance with the result of comparison. | 06-30-2011 |
20130063893 | ENERGY REPOSITORY DISCHARGE SYSTEM FOR CONSTRUCTION MACHINERY - A discharge system of a stored energy for a construction machine is provided, which includes the energy storage, an electric discharge device discharging energy stored in the energy storage, and an energy cooling portion increasing the heat dissipation capacity of the electric discharge device by cooling heat generated in the electric discharge device for a time when the energy stored in the energy storage is discharged to the electric discharge device. Since the heat generated in the electric discharge device is cooled by a cooling device while the energy stored in the energy storage is discharged to the electric discharge device, the heat dissipation capacity of the electric discharge device is increased to shorten the discharge time. Also, the operation period of the cooling device is controlled in proportion to the residual voltage of the energy storage, and thus the cooling efficiency is maximized. | 03-14-2013 |
20130090771 | CONTROL SYSTEM FOR A HYBRID EXCAVATOR - The present invention relates to a control system for a hybrid excavator including an engine, a hydraulic pump driven by the engine to drive a hydraulic actuator by hydraulic fluid, a generator driven by the engine to generate electric energy, and an energy storage device charging the electric energy generated by the generator and supplying the electric energy to an electric actuator, the control system comprising: a required torque detection means for detecting a torque that is required to drive the hydraulic pump; a charge amount detection means for detecting a charge rate (or charge amount) of the electric energy storage device; a memory storing a generation degree (or generation amount) in accordance with the torque and the charge rate (or charge amount); and a hybrid control means for controlling the generator in accordance with the torque value detected by the required torque detection means and the generation amount in a memory means that corresponds to the charge rate value (or charge amount) detected by the charge amount detection means. According to the control system, the fuel efficiency is optimized by driving the electric generator attached to the engine based on the required torque of the hydraulic pump and the preset generation amount value corresponding to the SOC (State Of Charge). | 04-11-2013 |
20130103272 | HORSEPOWER CONTROL SYSTEM OF A HYBRID EXCAVATOR AND CONTROL METHOD THEREFOR - Disclosed are a horsepower control system for a hybrid excavator and a control method thereof which controls the driving of a generator driver or a swing motor driver with a swing power ratio of 1 and a hydraulic power ratio of 1 in a first operation mode, and with a swing power ratio of r (a user set value) and a hydraulic power ratio of 1−r in a second operation mode. When the power required by the user is fully used, energy from an energy storage is used to maximize work capacity. When the total horsepower used is limited to the range of horsepower available, the limited use of the driving device is at a level of horsepower similar to that of a typical system, thereby minimizing fuel consumption. | 04-25-2013 |
20130116897 | SWING CONTROL APPARATUS AND METHOD OF CONSTRUCTION MACHINERY - A swing control apparatus and a swing control method for a construction machine are provided. The swing control apparatus includes a start position estimation unit, a stop target position calculation unit, and a swing motor position control unit. Even if an operator releases a lever or commands a stop at different times, an upper swing structure of the construction machine (for example, excavator) can be stopped within a predetermined range, and thus the inconvenience caused by an additional driving operation, which is required as the stop position differs according to the time point where the stop command starts, can be solved. | 05-09-2013 |
20130245899 | SWING CONTROL SYSTEM FOR HYBRID CONSTRUCTION MACHINE - A swing control system for a hybrid construction machine includes a swing operation lever, a hydraulic pump, an electric swing motor that makes an upper swing structure swing against a lower driving structure in accordance with an electric control signal corresponding to an operation amount of the swing operation lever, a swing parking brake released in accordance with an operation signal of the swing operation lever to drive the swing motor, a control valve which drives a hydraulic cylinder for the swing parking brake by hydraulic fluid from the hydraulic pump to release the swing parking brake if the control valve is shifted by an input of the operation signal from the swing operation lever, and a controller that controls the swing parking brake through shifting of the control valve or controls driving of the swing motor in accordance with the operation signal from the swing operation lever. | 09-19-2013 |
20130268166 | ENGINE IDLING CONTROL DEVICE OF EXCAVATOR AND METHOD THEREOF - An engine idling control device for an excavator and a method thereof are provided, which can recognize the state of an engine, an on/off state of a function selection switch, and a user's intention to work that has maximally been reflected, reduce fuel use and production of carbon dioxide through automatic stopping or driving of the engine in accordance with an operation state of a safety device having convenience, and easily implement an engine stop and start function in accordance with a user's selection. The engine idling control device includes a first signal detection unit, a second signal detection unit, and an engine idling control unit automatically stopping or driving an engine in accordance with the state of the engine, the on/off state of the function selection switch detected by the first signal detection unit, and the operation state of the safety device detected by the second signal detection unit. | 10-10-2013 |
20130269332 | ENERGY RECYCLING SYSTEM FOR A CONSTRUCTION APPARATUS - An energy recycling system is disclosed. When a construction apparatus performs a combined operation of a boom down operation and an arm out operation, hydraulic energy returned in the boom down operation is recycled for the arm out operation by the energy recycling system. An energy recycling system for a construction apparatus according to the present invention includes: a first hydraulic pump; a second hydraulic pump; an arm cylinder including a low-pressure chamber connected to the first hydraulic pump through an arm out supply passage; an arm out return passage connecting a high pressure chamber of the arm cylinder to a hydraulic tank; a boom cylinder including a low-pressure chamber connected to the second hydraulic pump through a boom down supply passage; a boom down return passage connecting a high pressure chamber of the boom cylinder to a hydraulic tank; a joining and recycling passage connecting the boom down return passage and the arm out supply passage to each other in parallel; a recycling passage connecting the boom down return passage and the boom down supply passage to each other in parallel; and a plurality of detecting means that detect pressure of the arm cylinder and pressure of the boom cylinder, respectively, to determine whether a hydraulic fluid, returned from the boom cylinder in a combined operation of a boom down operation and an arm out operation, is recycled. | 10-17-2013 |
20140150416 | HYDRAULIC ACTUATOR DAMPING CONTROL SYSTEM FOR CONSTRUCTION MACHINERY - Disclosed is an actuator damping control system for reducing shocks imparted to a hydraulic actuator caused by a change in load resulting from an abrupt manipulation of a boom or other working device. The hydraulic actuator damping control system for construction machinery according to one embodiment of the present invention comprises: first and second supply passages both supplying a hydraulic flow from a hydraulic pump to an inlet of an actuator; first and second discharge passages, both of which return the hydraulic flow from the actuator to a hydraulic tank; a first meter “in” control valve and a first meter “out” control valve for controlling the hydraulic flow supplied from the hydraulic pump to the actuator inlet and the hydraulic flow returned from the actuator outlet to the hydraulic tank, respectively, in order to control the actuator in a direction; a second meter “in” control valve and a second meter “out” control valve for controlling the hydraulic flow supplied from the hydraulic pump to the actuator inlet and the hydraulic flow returned from the actuator outlet to the hydraulic tank, respectively, in order to control the actuator in another direction; and a controller for outputting control signals for opening either the first or second meter “in” control valve according to the degree to which a joystick is manipulated and the load on the actuator, and for opening either the first or second meter “out” control valve when the load on the actuator exceeds a reference value. | 06-05-2014 |
20140158235 | HYDRAULIC CONTROL SYSTEM FOR CONSTRUCTION MACHINERY - A hydraulic control system for a construction machine is disclosed, which can operate an arm cylinder and a bucket cylinder by supplying hydraulic fluid from respective hydraulic pumps to the arm cylinder and the bucket cylinder during a combined operation, such as an excavating work, in which an arm joystick and a bucket joystick are simultaneously operated. The hydraulic control system includes a first arm control valve installed in a flow path between the first hydraulic pump and the arm cylinder and shifted to control a start, stop, and direction change of the arm cylinder in response to an operation of the arm joystick, a second arm control valve installed in a flow path between the second hydraulic pump and the arm cylinder and shifted to make discharged hydraulic fluid of the second hydraulic pump join hydraulic fluid of the arm cylinder to be supplied if a control signal according to the operation of the arm joystick exceeds a set value, a bucket control valve installed in a path between the second hydraulic pump and the bucket cylinder and shifted to control a start, stop, and direction change of the bucket cylinder in response to the operation of the bucket joystick, and a confluence cutoff proportional valve installed in a path between the second hydraulic pump and the second arm control valve. | 06-12-2014 |
20140174071 | HYDRAULIC CONTROL SYSTEM FOR CONSTRUCTION MACHINERY - The present invention relates to a hydraulic control system for construction machinery capable of variably adjusting a set pressure of a relief valve, which controls a set pressure of a hydraulic system, according to a value inputted by means of pressure in the hydraulic system or the manipulation of a joystick. The hydraulic control system comprises: a flow control valve installed in a passage between a hydraulic pump and a hydraulic actuator, for controlling the driving of the hydraulic actuator by being switched by a control signal according to the manipulation of the joystick; a main relief valve installed in a passage between an upstream-side discharge passage of the hydraulic pump and a hydraulic tank, for returning a working fluid to the hydraulic tank when a high load exceeding a set pressure occurs in the system; a pressure controlling means for controlling, either continuously or in stages, a set pressure of the main relief valve; a pressure sensing means for sensing a pressure at a discharge side of the hydraulic pump; and a controller for determining the value inputted by the manipulation of the joystick, and a required set pressure for the relief valve according to the system pressure sensed by the pressure sensing means, and then outputting a control signal to the pressure controlling means to enable a set pressure of the relief valve to be variably adjusted to a determined set pressure. | 06-26-2014 |
20140244118 | SYSTEM FOR CONTROLLING LAND LEVELING WORK WHICH USES AN EXCAVATOR - A grading control system using an excavator is disclosed, which determines and controls an operation amount of an attachment by combining an estimated pose of the attachment and an operator's operation signal of a joystick when a working mode for grading the ground is selected. The grading control system using an excavator includes an actuator connected to a hydraulic pump, an attachment driven by the actuator, a control valve shifted to drive the actuator, an electric joystick, a pressure detection means, a means for setting a working mode, and a controller, and repeatedly performs receiving a joystick operation signal value, a pressure value of an arm cylinder, and information on whether to set the working mode, calculating an external force that is applied to the attachment by the pressure value generated in the arm cylinder if a grading mode is selected, estimating a pose of the arm by the calculated external force value, performing a signal process by filtering the pose of the arm, and calculating operation amounts of a boom and the arm by combining the estimated pose of the arm and a control signal value according to an operator's operation of the joystick and proceeding to an initial stage. | 08-28-2014 |
20150134209 | BUCKET MOVEMENT CONTROL DEVICE FOR AUTOMATICALLY SHAKING OFF FOREIGN SUBSTANCES AND METHOD THEREFOR - An apparatus for controlling bucket movement for automatically shaking off foreign substances is disclosed, which includes a bucket movement control unit controlling the bucket movement by determining whether to output an automatic control signal for automatically driving the bucket forward and backward at a predetermined speed even if an input value of a joystick is not changed or to output a manual control signal for driving the bucket according to an operation value of the joystick, in accordance with a selection/non-selection of an automatic mode by an automatic mode selection switch, an operation value detected by an operation value detection means, and an operation angle detected by an operation angle detection means, and outputting a corresponding signal to a bucket driving unit. The movement of the bucket can be automatically controlled so as to control the foreign substances contained in the bucket and to sprinkle earth and sand without any separate operation of an operator. | 05-14-2015 |
20150176251 | DRIVING CONTROL METHOD FOR CONSTRUCTION MACHINE - A traveling control method for performing a smoothing work or the like through an operation of a working device during traveling is provided. The traveling control method includes a first step of inputting a set value of a delay time of a traveling switching function of a traveling switching valve; a second step of inputting in real time an operation signal value according to a user's operation of a joystick and a traveling pedal; a third step of determining whether to operate the traveling and working devices according to the operation of the traveling pedal and the joystick; a fourth step of switching the traveling switching valve to a traveling switching mode through control of the electronic valve and returning to the second step when the traveling pedal and the joystick are simultaneously operated; a fifth step of determining whether the traveling pedal is operated and the operation of the joystick is temporarily stopped for a predetermined time; a sixth step of determining whether the set value of the delay time of the traveling switching function is larger than an initially set time required and switching the traveling switching valve to the traveling switching mode if the set value is relatively larger than the initially set time; and a seventh step of releasing the traveling switching mode of the traveling switching valve through control of the electronic valve and returning to the second step in the case where the traveling pedal is not initially operated, in the case where the traveling pedal is operated and the joystick operation has been stopped over the predetermined time, or in the case where the initially set time required is larger than the set value of the delay time. | 06-25-2015 |
20150322648 | DEVICE AND METHOD FOR CONTROLLING FLOW RATE IN CONSTRUCTION MACHINERY - A flow control apparatus and a flow control method for a construction machine are disclosed, which can perform ground leveling work for smoothing the ground by the self weight of a boom without supplying hydraulic fluid from a hydraulic pump to a hydraulic cylinder. The flow control method for a construction machine including a hydraulic pump, a hydraulic actuator connected to the hydraulic pump, a control valve controlling a flow direction of hydraulic fluid supplied to the hydraulic actuator, a work mode switching valve installed in a flow path between the control valve and the hydraulic actuator to perform switching between a normal work mode and a floating mode, a detection means for detecting a boom-down operation amount of an operation lever operated by a user, an electronic proportional valve controlling a discharge flow rate of the hydraulic pump, and a controller, the flow control method including a first step of determining whether the present mode is switched to the floating mode; a second step of changing the discharge flow rate of the hydraulic pump corresponding to the boom-down operation amount detected by the detection means if the present mode is switched to the floating mode; and a third step of outputting an electrical control signal to the electronic proportional valve so that the hydraulic pump can discharge the hydraulic fluid at the changed flow rate corresponding to the boom-down operation amount. | 11-12-2015 |
20150354174 | METHOD FOR CONTROLLING DRIVING SPEED OF CONSTRUCTION MACHINERY - Disclosed is a method for controlling a driving speed of construction machinery for preventing a sudden change in the driving speed during a combined operation for operating a work device while driving an excavator. The method for controlling the driving speed of the construction machinery, according to one embodiment of the present invention, relates to the method for controlling the driving speed of the construction machinery comprising a lower driving body, a turning device for turning an upper turning body with respect to the lower driving body, a driving device, the work device, an electronic proportional valve for controlling the discharge flow rate of a hydraulic pump, and a controller. The method comprises: a first step of detecting the amount of operation of the driving device, the work device, and the turning device according to the operation of same; a second step of calculating a required working oil flow rate corresponding to the amount of operation of the driving device, the work device, and the turning device; a third step of reducing the required working oil flow rate of the driving device calculated in the second step, according to a ratio set by a driver, so that an independent maximum driving speed of the driving device can be reduced by the setting by the driver; and a fourth step of combining the required working oil flow rates calculated in the second step and the third step, and outputting a control signal to the electronic proportional valve so that the combined flow rate is discharged from the hydraulic pump. | 12-10-2015 |
20150370254 | Construction Equipment Driving Control Method - Disclosed is a construction equipment driving control method for controlling machine driving without using an additional straight driving pedal. According to the present invention, the construction equipment driving control method is applied to construction equipment comprising: right and left driving operation devices; a controller; right and left driving motors; right and left forward driving proportional solenoid valves; right and left backward driving proportional solenoid valves; and a setting means for setting the function for moving a machine forward or backward by the operation of the driving operation device, and the method comprises: a first step for moving the machine forward or backward by controlling the right and left driving motors correspondingly to the operation amount of operation pedals if one operation pedal among the driving operation devices is operated after a mode is converted into an activation mode by the operation of the setting means; and a second step for driving or converting, in the driving direction, the machine by controlling the right and left driving motors correspondingly to the operation amounts of the operation pedals of the driving operation devices if the pedals are simultaneously operated after a mode is converted into an inactivation mode by the operation of the setting means. | 12-24-2015 |
Patent application number | Description | Published |
20090133297 | EXCAVATOR MOUNTED WITH TANKS HAVING SIDE DOORS - An excavator mounted with tanks having side doors is provided, in which bend-formed side doors, which are mounted on outer sides of a hydraulic fluid tank and a fuel tank that are welded structures mounted on an upper frame of the excavator, have the same curved surfaces as an external shape of the equipment, so that no precise tank manufacturing work is required and welded portions of the tanks are prevented from being exposed to an outside. The excavator mounted with tanks having side doors includes a lower driving structure; an upper frame mounted on the lower driving structure to be swiveled; a cap and an engine room mounted in front and in the rear of the upper frame, respectively; working devices fixed to the upper frame and composed of a boom, an arm, and a bucket driven by hydraulic cylinders, respectively; a counter weight mounted in the rear of the upper frame to keep the balance of the equipment during working; a hydraulic fluid tank and a fuel tank mounted on the upper frame in front of the engine room; and side doors hingedly fixed to outer sides of the hydraulic fluid tank and the fuel tank, respectively, to form outer side surfaces of the hydraulic fluid tank and the fuel tank. | 05-28-2009 |
20090134302 | HOOD STAY APPARATUS FOR ENGINE ROOM IN HEAVY CONSTRUCTION EQUIPMENT - A hood stay apparatus for an engine room in heavy construction equipment is provided, which can safely keep an engine hood in an open state even if an external force is abruptly generated due to vibration, wind, and the like, and can facilitate an opening/closing operation of the engine hood. The hood stay apparatus which includes a rod guider provided with a guide rail movably coupled to a slider of a stay rod, and fixedly installed on one side of a hood frame so that the slider of the stay rod slides along the guide rail; a support rod guider provided with a support rail formed adjacent to a rear catch part of the guide rail, and installed on an upper part of the guide rail so that one side of an outer periphery of the stay rod is inserted into the support rail when the hood is opened; a control lever provided with a yoke coupled to a handle and one side of a pulling member, the handle being rotatably fixed to an upper part of the hood to generate a pulling force; and a locking stopper provided with a pulling arm coupled to the other side of the pulling member and a locking arm formed to extend from the pulling arm so as to rotate to be adjacent to the support rail, and selectively opening and closing the support rail when the locking arm is rotated by the pulling force generated by the control lever. | 05-28-2009 |
20090295117 | ANTI-SLIP DEVICE FOR HEAVY CONSTRUCTION EQUIPMENT - In an anti-slip device for heavy construction equipment equipped with a plurality of ventilation holes and installed in one side of an equipment body, an anti-slip device for heavy construction equipment comprises a slip prevention plate which includes a support groove curved with a certain interval and disposed closer to the ventilation holes, and a fixing hole which passes through the support groove; and an anti-vibration stopper which includes a head part mounted on an upper side of the fixing hole, and a support part which supports a lower side of the fixing hole, and contacts with the upper surface of the equipment body and the support part, respectively. The anti-slip device for heavy construction equipment can reliably maintain an interval between a slip prevention plate and an equipment body with the help of an anti-vibration stopper for thereby effectively absorbing the weights and vibrations applied to a slip prevention plate. | 12-03-2009 |
20140109998 | FUEL TANK FOR HEAVY CONSTRUCTION EQUIPMENT - A fuel tank for a construction machine is disclosed, which can prevent a diesel heater from being inoperable due to an inflow of moisture that is generated within a fuel tank in an extremely cold area and make the moisture within the fuel tank be filtered through a water separator. The fuel tank for a construction machine includes a baffle plate preventing fuel flow during movement of the machine, a lower cover mounted on a bottom surface of the fuel tank, a drain port mounted on the lower cover to discharge the moisture included in fuel a fuel return port capable of making the fuel from an engine side return to the fuel tank, a fuel suction port mounted on the lower cover to supply the fuel from the fuel tank to the engine side, a suction filter mounted on the fuel suction port. | 04-24-2014 |
20150252594 | LOCK DEVICE FOR HOOD OF ENGINE ROOM OF CONSTRUCTION MACHINE - Disclosed is a lock device for a hood of an engine room of a construction machine, capable of limiting the motion of the hood in the left and right directions and the forward and backward directions by an external force generated by a vibration caused during operation when the hood is closed. The lock device for a hood of an engine room of a construction machine according to the present invention comprises: a catch device mounted on the inner surface of the hood; a latch device including a latch plate mounted on an upper frame and a striker mounted on the latch plate in the forward and backward directions to attach/detach a locker of the catch device, the latch device limiting the motion of the hood in the left and right directions when the hood is closed; and a position guide which is mounted on the inner surface of the hood, and which has, at a lower end thereof, a stopper protrusion to be detachably coupled to the sliding groove formed in one side of the latch plate, the position guide limiting the motion of the hood in the forward and backward directions when the hood is closed. | 09-10-2015 |
20150259961 | HOOD OPENING AND CLOSING DEVICE FOR ZERO TAIL TYPE CONSTRUCTION MACHINERY - The present invention relates to a hood opening and closing device for zero tail type construction machinery that is used to open and close a swing type hood, at which a hinge portion is mounted on a fuel tank in a left-right direction. The hood opening and closing device for zero tail type construction machinery according to the present invention includes: a first sheet that is mounted on an outer side surface of a fuel tank; a pivot plate that is pivotally fixed to the hinge portion which is mounted on the first sheet; the swing type hood that is connected to an upper end of the pivot plate and is opened and closed in the left-right direction through a circular movement about the hinge portion; a second sheet that is mounted on an upper surface of the fuel tank; and a gas spring which has one end fixed to the second sheet and the other end fixed to a bottom surface of the swing type hood and supports, opens, and closes the swing type hood. | 09-17-2015 |