CN110725360A - Hydraulic pump control device of electric excavator and control method of hydraulic pump - Google Patents
Hydraulic pump control device of electric excavator and control method of hydraulic pump Download PDFInfo
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- CN110725360A CN110725360A CN201911218804.8A CN201911218804A CN110725360A CN 110725360 A CN110725360 A CN 110725360A CN 201911218804 A CN201911218804 A CN 201911218804A CN 110725360 A CN110725360 A CN 110725360A
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- 238000004891 communication Methods 0.000 description 4
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- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
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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
-
- 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
- E02F9/22—Hydraulic or pneumatic drives
-
- 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
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a hydraulic pump control device of an electric excavator, which comprises an electromagnetic proportional valve, a rotating speed sensor and a control module, wherein the electromagnetic proportional valve is connected with a hydraulic pump of the electric excavator and used for adjusting the output flow of the hydraulic pump; the rotating speed sensor is arranged on a flywheel disc of a motor of the electric excavator and used for detecting the real-time rotating speed of the motor; the control module is used for acquiring the rotating speed of the motor set by the accelerator knob as a reference rotating speed; the control module compares the real-time rotating speed with a reference rotating speed and controls the electromagnetic proportional valve to adjust the output flow of the hydraulic pump according to a comparison result. The hydraulic pump control device of the electric excavator provided by the invention is convenient for automatically adjusting the output flow of the hydraulic pump and improving the efficiency of the hydraulic pump. Meanwhile, the invention also provides a control method of the hydraulic pump of the electric excavator, which is convenient for realizing the automatic regulation of the output flow of the hydraulic pump.
Description
Technical Field
The invention relates to the technical field of hydraulic pump control of electric excavators, in particular to a hydraulic pump control device of an electric excavator and a control method of a hydraulic pump of the electric excavator.
Background
The excavator is the first soldier of engineering machine tool, is used widely in many places such as harbour, cubic metre of earth and rockwork, irrigation and water conservancy, and the vast majority of excavators are all driven with fuel engine at present stage, and its advantage is that mobility is strong, and the off-road nature is high. But simultaneously has the defects of high engine noise, serious exhaust pollution, high use cost and high maintenance cost. With the current increasingly strict emission limit on excavators at home and abroad, clean energy is advocated to be used by the country and the development of related technologies of engineering machinery, and engineering machinery equipment using electricity as a power source gradually becomes a development trend. Electric engineering machinery such as an electric excavator appears in the world, and if the oil which does not reach the standard in emission is eliminated and scrapped, serious waste and economic loss are caused. If the industry is upgraded on the basis, and the electric transformation is carried out, the machine which is about to be eliminated and scrapped can be renewed. In addition, as the excavator continuously develops towards high efficiency and low consumption, the variable pump is very commonly used, the high efficiency region of the variable pump is concentrated in a medium-pressure region and a full-displacement region at present, the efficiency of the medium-and-small displacement region is low, and energy can be seriously wasted due to long-term operation. In the prior art, an engine and a control system are removed after electric modification, so that an excavator cannot realize efficient action and operation of a hydraulic pump through a working device, the hydraulic pump displacement valve is manually adjusted in actual operation, the operation is complex, manual adjustment is realized, the adjustment amount is not easy to control, if the displacement is too large, an oil cylinder is easily positioned at a limit position to generate overflow loss, and the phenomena of speed drop and overload shutdown can be caused in severe cases.
Disclosure of Invention
Aiming at the defects in the prior art, the hydraulic pump control device of the electric excavator provided by the invention is convenient for automatically adjusting the output flow of the hydraulic pump and improving the efficiency of the hydraulic pump.
In a first aspect, the present invention provides a hydraulic pump control device for an electric excavator, including:
the electromagnetic proportional valve is connected with a hydraulic pump of the electric excavator and used for adjusting the output flow of the hydraulic pump;
the rotating speed sensor is arranged on a flywheel disc of a motor of the electric excavator and used for detecting the real-time rotating speed of the motor;
the control module is electrically connected with an accelerator knob on the electric excavator, and is used for setting the rotating speed of the motor and acquiring the rotating speed of the motor set by the accelerator knob as a reference rotating speed;
the control module is respectively electrically connected with the electromagnetic proportional valve and the rotating speed sensor and used for comparing the real-time rotating speed with the reference rotating speed and controlling the electromagnetic proportional valve to adjust the output flow of the hydraulic pump according to the comparison result.
Optionally, the control module is fitted with a programmable controller device.
Optionally, the control module is equipped with a power supply device.
Optionally, a current output sensor is installed on the control module, and the current output sensor is connected to the electromagnetic proportional valve and is used for outputting a current signal to the electromagnetic proportional valve according to a comparison result of the control module.
Optionally, a voltage sensor is installed on the control module, and the voltage sensor is electrically connected with the control module and an accelerator knob of the electric excavator respectively, so as to detect the motor rotation speed set by the accelerator knob and transmit the motor rotation speed set by the accelerator knob to the control module.
According to the technical scheme, the invention has the beneficial effects that: the invention provides a hydraulic pump control device of an electric excavator, which comprises an electromagnetic proportional valve, a rotating speed sensor and a control module, wherein the electromagnetic proportional valve is connected with a hydraulic pump of the electric excavator and used for adjusting the output flow of the hydraulic pump; the rotating speed sensor is arranged on a flywheel disc of a motor of the electric excavator and used for detecting the real-time rotating speed of the motor; the control module is electrically connected with an accelerator knob which is used for setting the rotating speed of the motor and used for collecting the rotating speed of the motor set by the accelerator knob as a reference rotating speed; the control module is respectively electrically connected with the electromagnetic proportional valve and the rotating speed sensor and used for comparing the real-time rotating speed with the reference rotating speed and controlling the electromagnetic proportional valve to adjust the output flow of the hydraulic pump according to the comparison result. The hydraulic pump control device of the electric excavator provided by the invention is convenient for automatically adjusting the output flow of the hydraulic pump and improving the efficiency of the hydraulic pump.
In a second aspect, the invention provides a method for controlling a hydraulic pump of an electric excavator, which specifically includes the following steps:
s1, taking a control module, a rotating speed sensor and an electromagnetic proportional valve for standby, installing the rotating speed sensor on a flywheel disc of a motor of the electric excavator, connecting the electromagnetic proportional valve with a hydraulic pump of the electric excavator, and electrically connecting the control module with the rotating speed sensor, the electromagnetic proportional valve and an accelerator knob of the electric excavator respectively;
s2, when the electric excavator works, the rotating speed sensor detects the real-time rotating speed of the motor, and the control module acquires the real-time rotating speed detected by the rotating speed sensor and compares the real-time rotating speed with the rotating speed of the motor set by the accelerator knob to judge the working condition of the motor;
if the real-time rotating speed is equal to the set rotating speed of the motor, the control module adjusts the output flow of the hydraulic pump by changing the percentage of the electromagnetic proportional valve, so that the output power of the hydraulic pump is matched with the output power of the motor;
and if the real-time rotating speed is less than the set rotating speed of the motor, the control module reduces the output flow of the hydraulic pump through the electromagnetic proportional valve, so that the output power of the hydraulic pump is reduced.
According to the technical scheme, the control method of the hydraulic pump of the electric excavator is convenient for realizing automatic adjustment of the output flow of the hydraulic pump.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals:
101-control module, 102-motor, 103-accelerator knob, 104-hydraulic pump, 105-power supply module.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1, a hydraulic pump control device for an electric excavator according to the present embodiment includes:
an electromagnetic proportional valve connected to the hydraulic pump 104 of the electric excavator to adjust an output flow rate of the hydraulic pump;
a rotation speed sensor mounted on a flywheel disc of the motor 102 of the electric excavator for detecting a real-time rotation speed of the motor;
the control module 101 is electrically connected with an accelerator knob 103 which is arranged on the electric excavator and used for setting the rotating speed of the motor, and is used for collecting the rotating speed of the motor set by the accelerator knob as a reference rotating speed; preferably, a voltage sensor is installed on the control module, and the voltage sensor is electrically connected with the control module and an accelerator knob of the electric excavator respectively and used for detecting the rotating speed of the motor set by the accelerator knob and transmitting the rotating speed of the motor set by the accelerator knob to the control module. In the prior art, the distance of the accelerator knob for setting the rotating speed of the motor is to change the voltage of a rotor of the motor, and the rotating speed of the motor is set by changing the voltage. The voltage sensor measures the voltage set by the accelerator knob, so that the rotating speed of the motor set by the accelerator knob is obtained.
The control module is respectively electrically connected with the electromagnetic proportional valve and the rotating speed sensor and used for comparing the real-time rotating speed with the reference rotating speed and controlling the electromagnetic proportional valve to adjust the output flow of the hydraulic pump according to the comparison result. And the control module is provided with a current output sensor which is connected with the electromagnetic proportional valve and used for outputting a current signal to the electromagnetic proportional valve according to a comparison result of the control module. For example, when the real-time rotating speed is equal to the reference rotating speed, the control module outputs a current signal to the electromagnetic proportional valve through the current output sensor, changes the electromagnetic proportion of the electromagnetic proportional valve, and adjusts the output flow of the hydraulic pump so that the output power of the hydraulic pump is matched with the output power of the motor; when the real-time rotating speed is smaller than the reference rotating speed, the control module outputs a current signal to the electromagnetic proportional valve through the current output sensor, the electromagnetic proportion of the electromagnetic proportional valve is changed, the output flow of the hydraulic pump is reduced, and the output power of the hydraulic pump is reduced. Preferably, the control module is equipped with a programmable controller device. The control module is used for inputting a safety difference value to the control module, when the difference value between the real-time rotating speed and the reference rotating speed is smaller than or larger than the safety difference value, the control module does not adjust the output flow of the hydraulic pump, and when the difference value between the real-time rotating speed and the reference rotating speed is larger than the safety difference value, the control module adjusts the output flow of the hydraulic pump, so that the control module is prevented from frequently adjusting the output flow of the hydraulic pump, and the hydraulic pump is damaged. And the control module is provided with a power supply device for supplying power to the control module. The control module and the power supply module 105 of the electric excavator are both provided with wireless communication devices, and the control module and the power supply module of the electric excavator are in wireless communication connection through the wireless communication devices. The programmable controller device is further configured to input a maximum difference value to the control module, and the control module shuts down the power module via the wireless communication device to stop the motor when the difference value between the real-time rotational speed and the reference rotational speed is greater than the maximum difference value. It is convenient to prevent damage to the motor in the event of a fault. The hydraulic pump control device of the electric excavator provided by the invention is convenient for automatically adjusting the output flow of the hydraulic pump and improving the efficiency of the hydraulic pump.
If an existing electric excavator needs to be modified, a method for controlling a hydraulic pump of an electric excavator provided in another embodiment of the present invention specifically includes the following steps:
s1, taking a control module, a rotating speed sensor and an electromagnetic proportional valve for standby, installing the rotating speed sensor on a flywheel disc of a motor of the electric excavator, connecting the electromagnetic proportional valve with a hydraulic pump of the electric excavator, and electrically connecting the control module with the rotating speed sensor, the electromagnetic proportional valve and an accelerator knob of the electric excavator respectively; and the control module is provided with an electrical interface for butting the hydraulic pump.
S2, when the electric excavator works, the rotating speed sensor detects the real-time rotating speed of the motor, and the control module acquires the real-time rotating speed detected by the rotating speed sensor and compares the real-time rotating speed with the rotating speed of the motor set by the accelerator knob to judge the working condition of the motor;
if the real-time rotating speed is equal to the set rotating speed of the motor, the control module adjusts the output flow of the hydraulic pump by changing the percentage of the electromagnetic proportional valve, so that the output power of the hydraulic pump is matched with the output power of the motor;
and if the real-time rotating speed is less than the set rotating speed of the motor, the control module reduces the output flow of the hydraulic pump through the electromagnetic proportional valve, so that the output power of the hydraulic pump is reduced.
The existing electric excavator adopts a quantitative hydraulic pump, the flow and the pressure are not regulated under a certain rotating speed, the required power is overlarge, and meanwhile, a control system of the existing electric excavator is complex and high in cost, and the existing electric excavator cannot normally work without an engine. The embodiment is provided with the electric interface for butting the hydraulic pump on the control module, the output flow can be automatically adjusted according to the real-time rotating speed of the motor, namely the output flow is small when the real-time rotating speed is high, and the output flow is large when the real-time rotating speed is low, so that the number of hydraulic elements can be saved, an oil circuit system is simplified, and the heating of oil can be reduced.
After the existing excavator is electrically transformed, the original excavator control system is adopted to control the hydraulic pump, and the hydraulic pump can be conveniently and quickly automatically adjusted by adopting the excavator control system, so that the working efficiency is higher, and the adjustment and control are better. Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (6)
1. A hydraulic pump control device for an electric excavator, comprising:
the electromagnetic proportional valve is connected with a hydraulic pump (104) of the electric excavator and used for adjusting the output flow of the hydraulic pump;
the rotating speed sensor is arranged on a flywheel disc of a motor (102) of the electric excavator and used for detecting the real-time rotating speed of the motor;
the control module (101) is electrically connected with an accelerator knob (103) which is used for setting the rotating speed of the motor and arranged on the electric excavator, and is used for collecting the rotating speed of the motor set by the accelerator knob as a reference rotating speed;
the control module is respectively electrically connected with the electromagnetic proportional valve and the rotating speed sensor and used for comparing the real-time rotating speed with the reference rotating speed and controlling the electromagnetic proportional valve to adjust the output flow of the hydraulic pump according to the comparison result.
2. The hydraulic pump control device for an electric excavator according to claim 1, wherein: the control module is equipped with a programmable controller device.
3. The hydraulic pump control device for an electric excavator according to claim 1, wherein: the control module is provided with a power supply device.
4. The hydraulic pump control device for an electric excavator according to claim 1, wherein: and the control module is provided with a current output sensor which is connected with the electromagnetic proportional valve and used for outputting a current signal to the electromagnetic proportional valve according to a comparison result of the control module.
5. The hydraulic pump control device for an electric excavator according to claim 1, wherein: the control module is provided with a voltage sensor which is respectively electrically connected with the control module and an accelerator knob of the electric excavator and used for detecting the rotating speed of the motor set by the accelerator knob and transmitting the rotating speed of the motor set by the accelerator knob to the control module.
6. A control method of a hydraulic pump of an electric excavator is characterized by comprising the following steps:
s1, taking a control module, a rotating speed sensor and an electromagnetic proportional valve for standby, installing the rotating speed sensor on a flywheel disc of a motor of the electric excavator, connecting the electromagnetic proportional valve with a hydraulic pump of the electric excavator, and electrically connecting the control module with the rotating speed sensor, the electromagnetic proportional valve and an accelerator knob of the electric excavator respectively;
s2, when the electric excavator works, the rotating speed sensor detects the real-time rotating speed of the motor, and the control module acquires the real-time rotating speed detected by the rotating speed sensor and compares the real-time rotating speed with the rotating speed of the motor set by the accelerator knob to judge the working condition of the motor;
if the real-time rotating speed is equal to the set rotating speed of the motor, the control module adjusts the output flow of the hydraulic pump by changing the percentage of the electromagnetic proportional valve, so that the output power of the hydraulic pump is matched with the output power of the motor;
and if the real-time rotating speed is less than the set rotating speed of the motor, the control module reduces the output flow of the hydraulic pump through the electromagnetic proportional valve, so that the output power of the hydraulic pump is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911218804.8A CN110725360A (en) | 2019-12-03 | 2019-12-03 | Hydraulic pump control device of electric excavator and control method of hydraulic pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911218804.8A CN110725360A (en) | 2019-12-03 | 2019-12-03 | Hydraulic pump control device of electric excavator and control method of hydraulic pump |
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| CN110725360A true CN110725360A (en) | 2020-01-24 |
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| CN201911218804.8A Pending CN110725360A (en) | 2019-12-03 | 2019-12-03 | Hydraulic pump control device of electric excavator and control method of hydraulic pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565055A (en) * | 2021-07-23 | 2021-10-29 | 徐州徐工挖掘机械有限公司 | Electromagnetic chuck control system and excavator |
| CN113867196A (en) * | 2021-09-14 | 2021-12-31 | 江苏徐工工程机械研究院有限公司 | Intelligent control system and method for vertical lifting drainage vehicle |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2673954Y (en) * | 2004-01-18 | 2005-01-26 | 三一重工股份有限公司 | Limiting load adjusting device for full hydraulic bulldozer |
| JP2007290607A (en) * | 2006-04-26 | 2007-11-08 | Kobelco Contstruction Machinery Ltd | Power source device of hybrid type working machine |
| CN101165282A (en) * | 2006-10-20 | 2008-04-23 | 神钢建设机械株式会社 | Hybrid working machine |
| CN101568692A (en) * | 2007-02-09 | 2009-10-28 | 日立建机株式会社 | Pump torque control device for hydraulic construction machine |
| CN102505996A (en) * | 2011-11-28 | 2012-06-20 | 上海中联重科桩工机械有限公司 | Power matching system for electronic control engine and volume adjustable hydraulic pump and method |
| CN202450561U (en) * | 2011-12-27 | 2012-09-26 | 山重建机有限公司 | Electric hydraulic excavator |
| CN102996265A (en) * | 2012-11-27 | 2013-03-27 | 中联重科股份有限公司渭南分公司 | Engineering mechanical equipment as well as method, device and system for controlling rotation speed of engine of engineering mechanical equipment |
| CN103080430A (en) * | 2010-09-08 | 2013-05-01 | 日立建机株式会社 | Hybrid construction machine |
| CN103384746A (en) * | 2011-03-01 | 2013-11-06 | 日立建机株式会社 | Control device for construction machine |
| CN103562565A (en) * | 2011-05-25 | 2014-02-05 | 神钢建设机械株式会社 | Rotary work machine |
| CN103603407A (en) * | 2013-10-22 | 2014-02-26 | 山重建机(济宁)有限公司 | Oil-electric powered hydraulic gripper control device |
| CN103774711A (en) * | 2012-10-22 | 2014-05-07 | 山重建机有限公司 | Electric excavator controller |
| CN105257632A (en) * | 2015-10-27 | 2016-01-20 | 中联重科股份有限公司 | Hydraulic driving system and control method thereof, and environmental sanitation machine |
| CN211340955U (en) * | 2019-12-03 | 2020-08-25 | 湖南力诚新能源科技有限公司 | Hydraulic pump control device of electric excavator |
-
2019
- 2019-12-03 CN CN201911218804.8A patent/CN110725360A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2673954Y (en) * | 2004-01-18 | 2005-01-26 | 三一重工股份有限公司 | Limiting load adjusting device for full hydraulic bulldozer |
| JP2007290607A (en) * | 2006-04-26 | 2007-11-08 | Kobelco Contstruction Machinery Ltd | Power source device of hybrid type working machine |
| CN101165282A (en) * | 2006-10-20 | 2008-04-23 | 神钢建设机械株式会社 | Hybrid working machine |
| CN101568692A (en) * | 2007-02-09 | 2009-10-28 | 日立建机株式会社 | Pump torque control device for hydraulic construction machine |
| CN103080430A (en) * | 2010-09-08 | 2013-05-01 | 日立建机株式会社 | Hybrid construction machine |
| CN103384746A (en) * | 2011-03-01 | 2013-11-06 | 日立建机株式会社 | Control device for construction machine |
| CN103562565A (en) * | 2011-05-25 | 2014-02-05 | 神钢建设机械株式会社 | Rotary work machine |
| CN102505996A (en) * | 2011-11-28 | 2012-06-20 | 上海中联重科桩工机械有限公司 | Power matching system for electronic control engine and volume adjustable hydraulic pump and method |
| CN202450561U (en) * | 2011-12-27 | 2012-09-26 | 山重建机有限公司 | Electric hydraulic excavator |
| CN103774711A (en) * | 2012-10-22 | 2014-05-07 | 山重建机有限公司 | Electric excavator controller |
| CN102996265A (en) * | 2012-11-27 | 2013-03-27 | 中联重科股份有限公司渭南分公司 | Engineering mechanical equipment as well as method, device and system for controlling rotation speed of engine of engineering mechanical equipment |
| CN103603407A (en) * | 2013-10-22 | 2014-02-26 | 山重建机(济宁)有限公司 | Oil-electric powered hydraulic gripper control device |
| CN105257632A (en) * | 2015-10-27 | 2016-01-20 | 中联重科股份有限公司 | Hydraulic driving system and control method thereof, and environmental sanitation machine |
| CN211340955U (en) * | 2019-12-03 | 2020-08-25 | 湖南力诚新能源科技有限公司 | Hydraulic pump control device of electric excavator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565055A (en) * | 2021-07-23 | 2021-10-29 | 徐州徐工挖掘机械有限公司 | Electromagnetic chuck control system and excavator |
| CN113565055B (en) * | 2021-07-23 | 2023-04-28 | 徐州徐工挖掘机械有限公司 | Electromagnetic chuck control system and excavator |
| CN113867196A (en) * | 2021-09-14 | 2021-12-31 | 江苏徐工工程机械研究院有限公司 | Intelligent control system and method for vertical lifting drainage vehicle |
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Application publication date: 20200124 |