WO2015046901A1 - 선회 브레이크를 이용한 선회 전동기 제어 장치 및 그 방법 - Google Patents
선회 브레이크를 이용한 선회 전동기 제어 장치 및 그 방법 Download PDFInfo
- Publication number
- WO2015046901A1 WO2015046901A1 PCT/KR2014/008934 KR2014008934W WO2015046901A1 WO 2015046901 A1 WO2015046901 A1 WO 2015046901A1 KR 2014008934 W KR2014008934 W KR 2014008934W WO 2015046901 A1 WO2015046901 A1 WO 2015046901A1
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- WO
- WIPO (PCT)
- Prior art keywords
- swing
- turning
- upper body
- motor
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
- E02F9/12—Slewing or traversing gears
- E02F9/121—Turntables, i.e. structure rotatable about 360°
- E02F9/123—Drives or control devices specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
- E02F9/12—Slewing or traversing gears
- E02F9/121—Turntables, i.e. structure rotatable about 360°
- E02F9/128—Braking systems
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
- E02F9/2095—Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/24—Safety devices, e.g. for preventing overload
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
Definitions
- An embodiment of the present invention relates to a swing motor control apparatus using a swing brake and a method thereof, and more particularly, to overheat the swing motor by using a mechanical brake when the swing motor is overheated in a hybrid construction machine in which the swing upper body is driven by an electric motor.
- the present invention relates to a turning motor control apparatus using a turning brake and a method thereof, which can prevent the turning.
- construction machinery such as excavators have a structure in which the upper swing structure is pivotably coupled to the lower traveling body for the purpose of expanding the work efficiency and the work range.
- Hydraulic excavators are all implemented through hydraulic devices, such as turning the upper swing and driving the bucket. The hydraulic excavator is controlled so that the turning brake is automatically released when the operator manipulates any of the boom, arm, bucket and the turning joystick.
- hybrid systems include hybrid systems for heavy equipment such as hybrid cars and excavators.
- the upper swing body can pivot on the lower travel body through drive means such as a swing motor.
- drive means such as a swing motor.
- the upper swing structure stops by the stopping of the swing motor.
- the swing brake device can be driven to brake the upper swing structure and to fix the upper swing body to any external force and inertia.
- Hybrid excavators in which the swinging upper body is driven by an electric motor, generate turning torques unlike ordinary hydraulic excavators. To this end, the hybrid excavator controls the current of the turning motor. Torque is generated in proportion to the amount of current in the swing motor.
- hybrid excavators unlike engine-type excavators, are subjected to severe working conditions in which the turning motor can suddenly overheat if it is operated for a long time on slope.
- the upper body is loaded by gravity, and a large current flows in the turning motor of the hybrid excavator to prevent rotation by the load of the upper body.
- the heating value of the swing motor is proportional to the square of the magnitude of current, the swing motor may overheat if it is operated for a long time in the skim.
- the cooling system must be designed with sufficient capacity so that the turning motor of the hybrid excavator does not overheat.
- the cooling system is to ensure stability.
- the turning motor cooling system capacity must be extremely large.
- Embodiments of the present invention when a high current flows to the turning motor for a long time in the working environment (eg, slope or slope workplace) to continuously maintain the upper body posture of the hybrid construction machine driven by the electric motor, that is, emergency stop
- the switch detects that the switch is operated or when the upper body is in a stopped state and the temperature of the turning motor is higher than or equal to the preset threshold temperature
- the turning brake is mechanically fastened to fix the upper body and cut off the current of the turning motor.
- the present invention relates to a turning motor control device using a turning brake and a method thereof, which can prevent overheating and protect from overheating.
- an upper body swing control apparatus of a hybrid construction machine includes a swing electric motor for turning an upper body of a hybrid construction machine, a swing joystick for controlling the swing motor to control a swing motion of the upper body; A turning brake for limiting turning operation of the upper body, a turning brake control valve for controlling the turning brake and the turning joystick are judged that the turning brake is not operated, or the turning brake is released, If it is determined that overheating or a current of more than a threshold current is continuously applied for a predetermined time or more, the controller controls the turning brake control valve to operate the turning brake and cuts off the current supplied to the turning motor. It features.
- the swing brake control valve is selectively connected to the first high pressure line and the hydraulic oil tank through the first solenoid valve SV1, and the first solenoid valve is electrically connected to the emergency stop switch to be controlled by the emergency stop switch signal. It features.
- the swing brake control valve is hydraulically connected to the second solenoid valve SV2 so as to be selectively supplied with the swing joystick signal pressure and the pilot signal pressure.
- RTD resistance temperature detector
- an upper body swing control method of a hybrid construction machine which operates a swing joystick to control a swing motor and pivots or stops the upper body by an operation of the swing motor, wherein the swing joystick is operated. Detecting whether or not rotation of the upper body is stopped and determining whether the turning joystick is not operated or the upper body is stopped according to a detection result, and wherein the temperature of the turning motor is equal to or higher than a set temperature or is critical to the turning motor. Checking whether the current more than the current is continuously applied for a predetermined time and operating the swing brake to limit the swing operation of the upper body, and at the same time blocking the current supplied to the swing motor. .
- Embodiments of the present invention has the effect of preventing the phenomenon that the turning motor is overheated during non-degreasing operation in a hybrid construction machine driven by the turning upper body is a turning motor. That is, the embodiments of the present invention have the effect of preventing overheating of the turning motor by maintaining the posture with the turning brake in a state where the turning motor is overheated (the slope or the slope workplace), and cutting off the current of the turning motor. .
- embodiments of the present invention has the effect that the stability of the hybrid construction machine can be increased regardless of the workplace.
- the embodiments of the present invention can increase the reliability by reducing the occurrence of failure by controlling the operation of the turning brake in the same mechanical manner as in most general non-emergency or special working conditions, the general engine construction machine.
- embodiments of the present invention have the effect of miniaturizing the overall size by designing a smaller cooling system of the swinging motor for preventing overheating of the swinging motor.
- FIG. 1 is a block diagram of a hybrid excavator to which a turning motor control device according to an embodiment of the present invention is applied.
- FIG. 2 is a configuration diagram of a turning motor control apparatus using a turning brake according to an exemplary embodiment of the present invention.
- FIG. 3 is a block diagram of the emergency stop turning brake operated by a solenoid valve according to an embodiment of the present invention.
- FIG. 4 is a flowchart illustrating a turning motor control method using a turning brake according to an exemplary embodiment of the present invention.
- FIG. 1 is a block diagram of a hybrid excavator to which a turning motor control device according to an embodiment of the present invention is applied.
- the hybrid excavator includes an engine 10, a generator 20, a pump 30, a control valve 40, a boom / arm / bucket / driving actuator 50, and an energy storage device 60. And a turning electric motor 70.
- the hybrid construction machine operates the generator 20 and the pump 30 by the power of the engine 10.
- the generator 20 generates electrical energy
- the pump 30 generates hydraulic energy.
- the generator 20 generates electric energy to operate the turning electric motor 70, and the surplus electric energy is stored in the energy storage device 60.
- the swinging motor 70 may be operated as a generator during deceleration to produce electrical energy.
- the swing motor 70 may be operated by the electric energy charged in the energy storage device (60).
- the pump 30 discharges hydraulic oil, and the hydraulic oil is provided to the actuator 50 by various control valves 40. That is, the pump 30 is directly coupled to the engine 10 to supply hydraulic oil to the control valve 40. The pump 30 is rotated by the rotational force of the engine 10, and the hydraulic oil discharged from the pump 30 is supplied to the control valve 40.
- the actuator 50 is composed of an actuator including a boom actuator, an arm actuator, a bucket actuator, a traveling motor, an optional device, and the like.
- the turning motor 70 when turning the upper body, the turning motor 70 is controlled by the current value separately from the boom / arm / bucket / driving actuator 50, and the upper part is operated by the turning motor 70.
- Sieve turns when turning the upper body, the turning motor 70 is controlled by the current value separately from the boom / arm / bucket / driving actuator 50, and the upper part is operated by the turning motor 70.
- the swing motor 70 is driven by receiving electrical energy from the energy storage device 60, and the energy storage device 60 receives power from the generator 20. In the situation where the swing motor 70 is decelerated, the kinetic energy of the swing device is regenerated by the energy storage device 60, and the power lost by friction is supplied from the generator 20, so that the voltage of the energy storage device 60 is increased. Keep it at an appropriate level.
- FIG. 2 is a configuration diagram of a turning motor control apparatus using a turning brake according to an exemplary embodiment of the present invention.
- the swing motor control device includes a swing state detecting unit 210, a brake control unit 220, and a swing brake 230.
- the turning motor control device 200 receives the turning joystick pressure, the turning motor speed, the current, and the temperature to determine the turning operation state and whether overheating.
- the turning joystick controls the turning electric motor to steer the turning motion of the upper body.
- the turning motor control device 200 cuts off the current of the turning motor 70 to protect the turning motor 70 when the turning motor current for maintaining the turning stop state is excessive and overheating is expected. do.
- the turning motor control device 200 may fasten the turning brake 230 to maintain the posture of the upper body.
- the swing motor control apparatus 200 according to the embodiment of the present invention may be applied to a hybrid excavator in which the swing upper body is driven by the swing motor, but may also be applicable to other construction machines having the swing upper body.
- the swing brake 230 fixes the upper body of the construction machine, and releases the swing lock when any one of the boom, the arm, the bucket, or the swing joystick is operated.
- the turning brake 230 may be fastened or released according to an operation signal of the first and second solenoid valves for turning fixing provided in the turning brake 230.
- the turning state detecting unit 210 detects that the emergency stop switch is operated or detects that the upper body is in a stopped state and the temperature of the turning motor 70 is higher than or equal to a preset threshold temperature.
- the hybrid construction machine may be equipped with a swing joystick pressure sensor, a swing motor speed sensor, a swing motor current sensor and a swing motor temperature sensor.
- the hybrid construction machine may be equipped with an emergency stop switch to stop the pivoting upper body in an emergency.
- the turning state detecting unit 210 may detect that the upper body is in a stopped state or the temperature of the turning motor is greater than or equal to a predetermined threshold temperature from the sensor or the emergency stop switch.
- the turning state detecting unit 210 detects the turning joystick pressure to recognize whether the driver operates the upper body, and detects the turning motor speed to recognize whether the upper body is stopped.
- the turning state detector 210 determines whether the coil temperature of the turning motor is greater than or equal to a preset threshold temperature through a resistance temperature detector (RTD) sensor to recognize the overheating state of the turning motor.
- RTD resistance temperature detector
- an AC (active current) motor used in a hybrid excavator the shape of the current flowing through the coil is a sine wave. The amount of heat generated by the current during rotation may be relatively small.
- the brake control unit 220 when the turning state detection unit 210 detects the operation of the emergency stop switch or when the upper body is in a stopped state and the temperature of the turning motor is detected to be above the predetermined threshold temperature, the brake brake 230 The upper body is fixed by fastening and cuts off the current of the turning motor. That is, when it is detected that the turning is not manipulated by the turning joystick pressure sensor of the hybrid excavator, the brake controller 220 may fasten the turning brake 230 to fix the upper body.
- the brake control unit 220 engages the turning brake 230, while the turning motor 70 of the turning motor 70 It can be controlled to cut off the current.
- FIG. 3 is a block diagram of the emergency stop turning brake operated by a solenoid valve according to an embodiment of the present invention.
- the swing brake 230 includes a first solenoid valve 231, a second solenoid valve 232, a swing brake 233, and a swing brake control valve 234.
- the brake control unit 220 sets the operation signals of the first and second solenoid valves 231 and 232 to low, and when the turning state detecting unit 210 detects a stop state and whether or not there is an overheat, And the operation signals of the second solenoid valves 231 and 232 may be changed to high to engage the brake 233. In addition, if necessary, the turning brake 233 requires an emergency turning brake designed to be fastened immediately.
- the swing brake control valve 234 is a brake that controls the swing brake.
- the swing brake control valve 234 is selectively connected to the first high pressure line and the hydraulic oil tank 235 through the first solenoid valve SV1 231, and the first solenoid valve 231 is connected to the emergency stop switch signal. It is electrically connected to an emergency stop switch (not shown) to be controlled by.
- the swing brake control valve 234 is hydraulically connected to the second solenoid valve (SV2) 232 so as to selectively receive the swing joystick signal pressure and the pilot signal pressure.
- the brake control unit 220 controls the turning brake 233 by applying a driving voltage to the first solenoid valve SV1 231 and the second solenoid valve SV2 232.
- the first solenoid valve SV1 231 operates as a solenoid valve for turning brake emergency fastening. That is, the first solenoid valve SV1 231 is a solenoid driving valve which drains the pressure for releasing the turning brake in an emergency so that the brake 233 is immediately engaged.
- the second solenoid valve SV2 232 operates as an SH pressure shutoff solenoid valve. That is, the second solenoid valve SV2 232 is a solenoid driven valve for blocking the control flow path of the swing brake in an emergency.
- the PG shown in Figure 3 is always maintained at a high pressure
- SH is a high pressure when operating the joystick.
- FIG. 4 is a flowchart illustrating a turning motor control method using a turning brake according to an exemplary embodiment of the present invention.
- the brake controller 220 sets the first operation signal p1 and the second operation signal p2 of the first and second solenoid valves 231 and 232 to low (S402).
- the swing brake is controlled in the same mechanical manner as the engine type construction machine in accordance with the swing joystick operation state. That is, when any one of the boom, the arm, the bucket or the swing joystick is operated, the swing brake 230 is released.
- the turning state detecting unit 210 detects that the emergency stop switch is operated through the following steps S404 to S410, or detects that the upper body is in a stopped state and the temperature of the turning motor is greater than or equal to a preset threshold temperature.
- the turning state detecting unit 210 checks whether the turning emergency stop switch is OFF (S404). That is, the turning state detecting unit 210 detects whether a fault occurs in the turning motor control device 200 to operate the emergency stop switch.
- the turning state detecting unit 210 checks whether the turning joystick pressure signals s1 and s2 are "0" (S406). That is, the turning state detecting unit 210 senses the turning joystick pressure to detect whether the driver is willing to stop the upper body.
- the turning state detecting unit 210 checks whether the coil temperature of the turning motor is greater than or equal to a predetermined threshold temperature (S408).
- the turning state detecting unit 210 detects the temperature of the turning motor to determine a case where the temperature rises above the set value and the overheat is detected.
- the coil temperature of the turning motor is sensed by using a RTD sensor to recognize a case where the coil temperature is greater than or equal to a set value (eg, 90) as an overheating step approaching a fault level.
- the swing state detector 210 checks whether the speed of the swing motor is greater than or equal to “0” (S410). That is, the turning state detecting unit 210 detects the turning motor speed and detects whether the upper body is stopped.
- the purpose of detecting the stationary state by detecting the speed of the turning motor is that even if the turning joystick is operated in neutral by the inertia of the turning upper body, it requires a certain time until the turning upper body stops.
- the turning state detecting unit 210 performs a process S410 for checking whether the speed of the turning motor is "0".
- the brake control unit 220 sets the first operation signal p1 and the second operation signal p2 of the first and second solenoid valves to high, and turns the motor current. Is changed to 0A (S412). And the brake control unit 220 performs again from the process S404.
- the first operation signal p1 and the second operation signal p2 of the first and second solenoid valves 231 and 232 are changed to high, the turning brake 230 is released even if the driver operates the joystick. It is not immediately concluded.
- the turning state detection unit 210 determines that the emergency, the first operation signal (p1) and the first operation signal of the first and second solenoid valve 2 Set the operation signal p2 to High and change the turning motor current to 0A.
- the above-described swing brake control method can be implemented in a software program and recorded in a computer-readable predetermined recording medium.
- the recording medium may be a hard disk, a flash memory, a RAM, a ROM, or the like as an internal type of each playback device, or an optical disc such as a CD-R or a CD-RW, a compact flash card, a smart media, a memory stick, or a multimedia card as an external type. have.
- the program recorded on the computer-readable recording medium is a superstructure swing control method of the hybrid construction machine which controls the swing motor by operating the swing joystick, and swings or stops the upper body by the operation of the swing motor.
- the method may further include detecting whether the swing joystick is operated or whether the upper body is stopped rotating, and checking whether the swing joystick is not operated or the upper body is stopped according to a detection result, and the temperature of the swing motor is set. Checking whether the current above the temperature or above the threshold current is continuously applied to the swing motor for a predetermined time and operating the swing brake to limit the swing operation of the upper body, and at the same time interrupting the current supplied to the swing motor. You can run the step.
- Implementations described in the specification of the present invention may be implemented in digital electronic circuitry, computer software, firmware or hardware, or a combination of one or more of them. Implementations described in the specification of the present invention are one or more modules relating to computer program instructions encoded on a program storage medium of tangible type for controlling or by the operation of one or more computer program products, ie data processing apparatuses. It can be implemented as.
- the present invention can protect the swing motor from overheating when a high current flows to the swing motor for a long time in a workplace where the hybrid excavator is to maintain the posture of the upper body (for example, the slope sloping workshop).
- the invention is a commercially available invention because the possibility of marketing or operating the applied device is not only sufficient for the use of the related technology, but also practically evident as it exceeds the limitation of the existing technology.
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Abstract
Description
Claims (9)
- 하이브리드 건설 기계의 상부체를 선회시키는 선회 전동기;상기 선회 전동기를 제어하여 상기 상부체의 선회동작을 조종하는 선회 조이스틱;상기 상부체의 선회 동작을 제한하는 선회 브레이크;상기 선회 브레이크를 제어하는 선회 브레이크 제어밸브; 및상기 선회 조이스틱이 조작되고 있지 않다고 판단되거나 상기 선회 브레이크가 해제되었다고 판단되고 상기 선회 전동기에 설정 온도 이상의 과열이 발생하거나 임계 전류 이상의 전류가 일정 시간 이상 지속적으로 인가되고 있다고 판단되면, 상기 선회 브레이크가 작동하도록 상기 선회 브레이크 제어밸브를 제어하고, 상기 선회 전동기로 공급되는 전류를 차단하는 제어부를 포함하는 하이브리드 건설기계의 상부체 선회 제어장치.
- 제 1 항에 있어서,상기 선회 브레이크 제어밸브는 제1 솔레노이드 밸브(SV1)를 통해 제1 고압라인과 작동유 탱크에 선택적으로 연결되고, 상기 제1 솔레노이드 밸브는 비상 정지 스위치 신호에 의해 제어되도록 비상 정지 스위치에 전기적으로 연결된 것을 특징으로 하는 하이브리드 건설기계의 상부체 선회 제어장치.
- 제 1항에 있어서,상기 선회 브레이크 제어밸브는 상기 선회 조이스틱 신호압과 파일롯 신호압을 선택적으로 공급받아 전환되도록 제2 솔레노이드 밸브(SV2)와 유압적으로 연결된 것을 특징으로 하는 하이브리드 건설기계의 상부체 선회 제어장치.
- 제 1 항에 있어서,상기 선회 전동기의 코일 온도를 측정하여 측정값을 제어부에 전달하는 측온 저항체(RTD: Resistance Temperature Detector) 센서를 더 포함하는 것을 특징으로 하는 하이브리드 건설기계의 상부체 선회 제어장치.
- 선회 조이스틱을 조작하여 선회 전동기를 제어하고, 상기 선회 전동기의 동작에 의해 상부체를 선회 또는 정지시키는 하이브리드 건설기계의 상부체 선회 제어 방법에 있어서,상기 선회 조이스틱의 조작여부 또는 상기 상부체의 회전정지 여부를 검출하고, 검출 결과에 따라 상기 선회 조이스틱이 조작되지 않거나 상기 상부체가 정지 상태인지 확인하는 단계;상기 선회 전동기의 온도가 설정 온도 이상이거나 상기 선회 전동기에 임계 전류 이상의 전류가 일정 시간 이상 지속적으로 인가되는지 확인하는 단계; 및상기 상부체의 선회 동작을 제한하도록 선회 브레이크를 작동시키고, 이와 동시에 상기 선회 전동기로 공급되는 전류를 차단하는 단계를 포함하는 하이브리드 건설기계의 상부체 선회 제어방법.
- 제5항에 있어서,상기 상기 상부체가 정지 상태인지 확인하는 단계에서,상기 선회 조이스틱의 조작여부 또는 상기 상부체의 회전정지 여부를 검출하기 위하여 상기 선회 조이스틱의 압력을 감지하는 단계를 더 포함하는 것을 특징으로 하는 하이브리드 건설기계의 상부체 선회 제어방법.
- 제5항에 있어서,상기 선회 브레이크를 작동시키고, 이와 동시에 상기 선회 전동기로 공급되는 전류를 차단하는 단계 이전에,비상 정지 스위치로부터 발생된 비상 정지 신호가 제어부에 인가되면,상기 선회 브레이크를 작동시키고, 이와 동시에 상기 선회 전동기로 공급되는 전류를 차단하는 단계를 수행하는 것을 특징으로 하는 하이브리드 건설기계의 상부체 선회 제어방법.
- 제5항에 있어서,상기 선회 브레이크는 상기 선회 조이스틱 신호압과 파일롯 신호압을 선택적으로 공급받아 전환되는 것을 특징으로 하는 하이브리드 건설기계의 상부체 선회 제어방법.
- 제5항에 있어서,상기 선회 전동기의 온도는 상기 선회 전동기의 코일 온도를 측온 저항체 센서를 통해 측정하는 특징으로 하는 하이브리드 건설기계의 상부체 선회 제어방법.
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| KR1020167006049A KR101739710B1 (ko) | 2013-09-26 | 2014-09-25 | 선회 브레이크를 이용한 선회 전동기 제어 장치 및 그 방법 |
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| KR20130114346 | 2013-09-26 | ||
| KR10-2013-0114346 | 2013-09-26 |
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| PCT/KR2014/008934 Ceased WO2015046901A1 (ko) | 2013-09-26 | 2014-09-25 | 선회 브레이크를 이용한 선회 전동기 제어 장치 및 그 방법 |
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| WO2016204321A1 (ko) * | 2015-06-16 | 2016-12-22 | 볼보 컨스트럭션 이큅먼트 에이비 | 건설기계용 선회 제어장치 및 그 제어방법 |
| WO2024253807A1 (en) * | 2023-06-09 | 2024-12-12 | Caterpillar Inc. | Swing motion variable control system |
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| US12416133B2 (en) | 2023-06-09 | 2025-09-16 | Caterpillar Inc. | Swing motion variable control system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20160045743A (ko) | 2016-04-27 |
| KR101739710B1 (ko) | 2017-05-25 |
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