CN103233494B - A kind of energy-saving control system, excavator and method - Google Patents
A kind of energy-saving control system, excavator and method Download PDFInfo
- Publication number
- CN103233494B CN103233494B CN201310170562.6A CN201310170562A CN103233494B CN 103233494 B CN103233494 B CN 103233494B CN 201310170562 A CN201310170562 A CN 201310170562A CN 103233494 B CN103233494 B CN 103233494B
- Authority
- CN
- China
- Prior art keywords
- valve
- oil passage
- energy
- pump
- saving control
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- 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
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
- E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2282—Systems using center bypass type changeover valves
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
-
- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a kind of energy-saving control system, excavator and method, belong to Mechanical course field, energy-saving control system comprises adjuster (1), main pump (2) and main valve (3), central oil passage (4) is provided with in main valve (3), central oil passage (4) is provided with import and outlet, adjuster (1), the import of main pump (2) and central oil passage (4) communicates successively, main valve (3) is provided with pilot pressure sensor (5), the exit of central oil passage (4) is also provided with electromagnetic proportional valve (6), pilot pressure sensor (5) is connected with controller (7) with electromagnetic proportional valve (6).Energy-saving control method comprise setting central oil passage (4) estimate recirculating oil quantity Q
0; Calculate the actual recirculating oil quantity Q of main valve (3) central oil passage (4); As Q > Q
0, then controller (7) controls the aperture reduction of electromagnetic proportional valve (6), reduces the recirculating oil quantity of central oil passage (4).Technical scheme of the present invention, by controlling the recirculating oil quantity of solenoid-operated proportional valve regulation central oil passage, improves the operating efficiency of machine, reduce oil consumption, and response is higher.
Description
Technical field
The invention belongs to plant equipment control field, relate to a kind of energy-saving control system and method, particularly relate to a kind of energy-saving control system, excavator and the method that are applicable to excavator.
Background technology
At present, the main valve that domestic and international excavator uses has two kinds: open center type and close center type.Domestic excavator producer uses out center type system substantially, and abroad the excavator producer of some advanced persons has brought into use and closes center type system." open " center " system price low, but maneuverability is poor; " maneuverability of closing " center " system is good, and efficiency is high, but price is more expensive.
What domestic excavator producer used opens center type system, when excavator fine motion is done, when valve core of main valve is not opened completely, a hydraulic oil part for main pump supply enters equipment, a part flows back to fuel tank by the central oil passage of main valve, makes this part and has become energy dissipation by the hydraulic oil that central oil passage refluxes.
Summary of the invention
In view of this, the present invention is by controlling the recirculating oil quantity of solenoid-operated proportional valve regulation central oil passage, effectively can control the loss of excavator meta oil return when microoperation, make excavator when fine motion is done, the hydraulic oil that main pump provides almost all enters equipment, direct convenience, improves the operating efficiency of machine, reduce oil consumption, and response is higher.
For achieving the above object, concrete technical scheme is as follows:
On the one hand, a kind of energy-saving control system, comprise adjuster, main pump and main valve, central oil passage is provided with in described main valve, described central oil passage is provided with import and outlet, the import of described adjuster, main pump and central oil passage communicates successively, described main valve is provided with the pilot pressure sensor measuring aperture, also comprise electromagnetic proportional valve and controller, described electromagnetic proportional valve is located at the exit of described central oil passage, described pilot pressure sensor is connected with controller with electromagnetic proportional valve, and described controller controls the aperture size of described electromagnetic proportional valve.
Preferably, the exit of the central oil passage of described main valve is also provided with the flow transmitter measuring recirculating oil quantity, and described controller is connected with described flow transmitter.
Preferably, the exit of described main pump is also provided with pressure sensor, and described controller is connected with described pressure sensor.
Preferably, described in described step 3, adjuster is provided with proportioning valve, and described controller reduces the fuel delivery of described main pump by controlling described proportioning valve.
Preferably, described excavator is also provided with the motor with described main pump interlock, and described motor is connected with described controller.
Preferably, described proportioning valve comprises front pump proportioning valve and rear pump proportioning valve, and described main pump comprises front pump and rear pump, and described main valve comprises front valve core and back valve core, described front pump proportioning valve, front pump, front valve core communicate successively, and described rear pump proportioning valve, rear pump, back valve core communicate successively.
On the other hand, a kind of energy-saving control method, described excavator comprises energy-saving control system described above, and described energy-saving control method comprises:
Step 1, what described controller set the central oil passage of described main valve estimates recirculating oil quantity Q
0;
Step 2, described pilot pressure sensor measures the pilot pressure of described main valve, and transfers to described controller, and described controller calculates the actual recirculating oil quantity Q of the central oil passage of described main valve;
Step 3, described controller relatively described in estimate recirculating oil quantity Q
0with actual recirculating oil quantity Q, as Q > Q
0, then described controller controls the aperture reduction of described electromagnetic proportional valve, reduces the recirculating oil quantity of described central oil passage.
Preferably, described method also comprises:
Step 1, described controller sets described main pump hydraulic oil outlet place and estimates pressure P
0;
Step 2, the actual recirculating oil quantity Q of the central oil passage of described front valve core, the central oil passage of described back valve core measured by described flow transmitter
1, Q
2; Described pressure sensor measures described front pump hydraulic oil outlet place and rear pump hydraulic oil outlet place actual pressure P
1, P
2;
Step 3, as Q
1> Q
0or Q
2> Q
0, then described controller controls the aperture reduction of described electromagnetic proportional valve; As Q
1< Q
0or Q
2< Q
0, P
1> P
0or P
2> P
0, then described controller controlled adjuster reduces the fuel delivery of described front pump or described rear pump, when the fuel delivery of described main pump is minimum, and still there is Q
1< Q
0or Q
2< Q
0, P
1> P
0or P
2> P
0time, the rotating speed that described controller controls described motor reduces.
On the other hand, a kind of excavator, comprises energy-saving control system described above.
Relative to prior art, the advantage of technical scheme of the present invention has:
1, install electromagnetic proportional valve, flow transmitter in main valve central oil passage exit, direct-detection is recirculating oil quantity when machine fine motion is done, direct convenience, and response is higher.
2, effectively can be controlled the loss of excavator meta oil return when microoperation by the control of controller, make excavator when fine motion is done, the hydraulic oil that main pump provides all enters equipment, improves the operating efficiency of machine, reduces oil consumption.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that the embodiment of the present invention is provided with the excavator of energy-saving control system;
Fig. 2 is the control flow schematic diagram of the energy-saving control method of the embodiment of the present invention.
Wherein, 1 be adjuster, 2 be main pump, 22 be front pump, 21 be rear pump, 3 be main valve, 32 be front valve core, 31 be pilot pressure sensor, 6 be electromagnetic proportional valve, 62 be front electromagnetic proportional valve, 61 be rear electromagnetic proportional valve, 7 be controller, 8 be flow transmitter, 82 be front flow transmitter, 81 be rear flow transmitter, 9 be pressure sensor, 92 be front pressure sensor, 91 be rear pressure sensor, 10 be proportioning valve, 12 be front pump proportioning valve, 11 be rear pump proportioning valve for oil duct, 5 centered by back valve core, 4.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to accompanying drawing, concrete explaination is done to embodiments of the invention.
A kind of excavator energy-saving control system of embodiments of the invention and method, as shown in fig. 1, energy-saving control system comprises adjuster 1, main pump 2 and main valve 3, central oil passage 4 is provided with in main valve 3, central oil passage 4 is provided with import and outlet, the import of adjuster 1, main pump 2 and central oil passage 4 communicates successively, and main valve 3 is provided with the pilot pressure sensor 5 measuring aperture, and the exit of central oil passage 4 is also provided with electromagnetic proportional valve 6.Pilot pressure sensor 51 is connected with controller 7 with electromagnetic proportional valve 6.
Energy-saving control method of the present invention comprises:
Step 1, what controller 7 set main valve 3 central oil passage 4 estimates recirculating oil quantity Q
0;
Step 2, pilot pressure sensor 5 measures the aperture of main valve 3, and transfers to controller 7, and controller 7 calculates the actual recirculating oil quantity Q of main valve 3 central oil passage 4;
Step 3, controller 7 compares estimates recirculating oil quantity Q
0with actual recirculating oil quantity Q, as Q > Q
0, then controller 7 controls the aperture reduction of electromagnetic proportional valve 6, reduces the recirculating oil quantity of central oil passage 4.
The present invention is by controlling the recirculating oil quantity of solenoid-operated proportional valve regulation central oil passage, effectively can control the loss of excavator meta oil return when microoperation, make excavator when fine motion is done, the hydraulic oil that main pump provides almost all enters equipment, direct convenience, improve the operating efficiency of machine, reduce oil consumption, and response is higher.
As shown in fig. 1, in an embodiment of the present invention, the motor with main pump 2 interlock is also provided with in preferred energy-saving control system; The exit of main valve 3 central oil passage 4 is also provided with flow transmitter 8, and controller 7 is connected with flow transmitter 8; Main pump 2 hydraulic oil outlet place is also provided with pressure sensor 9; Be provided with proportioning valve 10 in adjuster 1, controller 7 reduces the fuel delivery of main pump 2 by control ratio valve 10.
In addition, as shown in fig. 1, in the Energy Saving Control system of embodiments of the invention, proportioning valve 10 comprises front pump proportioning valve 12 and rear pump proportioning valve 11, main pump 2 comprises front pump 22 and rear pump 21, and pressure sensor 9 comprises front pressure sensor 92 and rear pressure sensor 91, and main valve 3 comprises front valve core 32 and back valve core 31, electromagnetic proportional valve 6 comprises front electromagnetic proportional valve 62 and rear electromagnetic proportional valve 61, and flow transmitter 8 comprises front flow transmitter 82 and rear flow transmitter 81.
The front central oil passage 4 of front pump proportioning valve 12, front pump 22, front pressure sensor 92, front valve core 32, front electromagnetic proportional valve 62, front flow transmitter 82 communicate successively; Rear center's oil duct 4 of rear pump proportioning valve 11, rear pump 21, rear pressure sensor 91, back valve core 31, rear electromagnetic proportional valve 61, rear flow transmitter 81 communicate successively, and combine as shown in Figure 2, and the energy-saving control method of the embodiment of the present invention comprises:
Step 1, what controller 7 set the central oil passage 4 of front valve core 32 and the central oil passage 4 of back valve core 31 estimates recirculating oil quantity Q
0; What controller 7 set the central oil passage 4 of front valve core 32 and the central oil passage 4 of back valve core 31 estimates pressure P
0;
Step 2, signals collecting: flow transmitter 8, namely the actual recirculating oil quantity Q of the central oil passage 4 of front valve core 32, the central oil passage 4 of back valve core 32 measured respectively by flow transmitter 81, flow transmitter 82
1, Q
2; Pressure sensor 9, and the actual pressure P of the central oil passage 4 of front valve core 32, the central oil passage 4 of back valve core 31 measured respectively by front pressure sensor 92, rear pressure sensor 91
1, P
2;
Step 3, whether flow number is greater than preset value: as Q
1> Q
0or Q
2> Q
0then controller 7 controls electromagnetic proportional valve 6, and namely, the aperture of electromagnetic proportional valve 62 or rear electromagnetic proportional valve 61 reduces, and controls aperture reduce preferably by output than current value little under normal circumstances, prevent the hydraulic oil of central oil passage from flowing back to fuel tank, make it substantially all to enter equipment;
Judge whether overflow: as Q
1< Q
0or Q
2< Q
0, P
1> P
0or P
2> P
0then overflow risk increases, controller 7 controlled adjuster 1, namely control front pump proportioning valve 12 or rear pump proportioning valve 11 reduce main pump 2, i.e. the fuel delivery of front pump 22 or rear pump 21, control aperture preferably by the less current value of output, prevent main pump overflow from causing energy dissipation, when main pump 2, when namely the fuel delivery of front pump 22 or rear pump 21 is minimum, the rotating speed that controller 7 controls motor reduces.
A kind of excavator is also comprised in embodiments of the invention, wherein, be provided with above-mentioned energy-saving control system, because above-mentioned energy-saving control system has above-mentioned technique effect, therefore, the excavator being provided with this energy-saving control system also should possess corresponding technique effect, and its specific implementation process is similar to the above embodiments, does not hereby repeat
Be described in detail specific embodiments of the invention above, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and substituting also all among category of the present invention.Therefore, equalization conversion done without departing from the spirit and scope of the invention and amendment, all should contain within the scope of the invention.
Claims (7)
1. an energy-saving control system, comprise adjuster (1), main pump (2) and main valve (3), central oil passage (4) is provided with in described main valve (3), described central oil passage (4) is provided with import and outlet, described adjuster (1), the import of main pump (2) and central oil passage (4) communicates successively, described main valve (3) is provided with pilot pressure sensor (5), it is characterized in that, also comprise electromagnetic proportional valve (6) and controller (7), described electromagnetic proportional valve (6) is located at the exit of described central oil passage (4), described pilot pressure sensor (5) is connected with controller (7) with electromagnetic proportional valve (6), described controller (7) controls the aperture size of described electromagnetic proportional valve (6), the exit of the central oil passage (4) of described main valve (3) is also provided with the flow transmitter (8) measuring recirculating oil quantity, described controller (7) is connected with described flow transmitter (8).
2. energy-saving control system as claimed in claim 1, it is characterized in that, the exit of described main pump (2) is also provided with pressure sensor (9), and described controller (7) is connected with described pressure sensor (9).
3. energy-saving control system as claimed in claim 2, it is characterized in that, described adjuster (1) is provided with proportioning valve (10), and described controller (7) reduces the fuel delivery of described main pump (2) by controlling described proportioning valve (10).
4. energy-saving control system as claimed in claim 3, it is characterized in that, be also provided with the motor with described main pump (2) interlock, described motor is connected with described controller (7).
5. energy-saving control system as claimed in claim 4, it is characterized in that, described proportioning valve (10) comprises front pump proportioning valve (12) and rear pump proportioning valve (11), described main pump (2) comprises front pump (22) and rear pump (21), described main valve (3) comprises front valve core (32) and back valve core (31), described front pump proportioning valve (12), front pump (22), front valve core (32) communicate successively, and described rear pump proportioning valve (11), rear pump (21), back valve core (31) communicate successively.
6. an energy-saving control method, is characterized in that, is applicable to energy-saving control system as claimed in claim 5, and described energy-saving control method comprises:
Step 1, what described controller (7) set the central oil passage (4) of described main valve (3) estimates recirculating oil quantity Q
0;
Step 2, described pilot pressure sensor (5) measures the pilot pressure of described main valve (3), and transferring to described controller (7), described controller (7) calculates the actual recirculating oil quantity Q of the central oil passage (4) of described main valve (3);
Step 3, described controller (7) relatively described in estimate recirculating oil quantity Q
0with actual recirculating oil quantity Q, as Q > Q
0, then described controller (7) controls the aperture reduction of described electromagnetic proportional valve (6), reduces the recirculating oil quantity of described central oil passage (4).
7. an excavator, is characterized in that, comprises the energy-saving control system as described in any one of claim 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310170562.6A CN103233494B (en) | 2013-05-09 | 2013-05-09 | A kind of energy-saving control system, excavator and method |
| PCT/CN2014/073924 WO2014180189A1 (en) | 2013-05-09 | 2014-03-24 | Energy-saving control system, excavator and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310170562.6A CN103233494B (en) | 2013-05-09 | 2013-05-09 | A kind of energy-saving control system, excavator and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103233494A CN103233494A (en) | 2013-08-07 |
| CN103233494B true CN103233494B (en) | 2015-09-16 |
Family
ID=48881558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310170562.6A Expired - Fee Related CN103233494B (en) | 2013-05-09 | 2013-05-09 | A kind of energy-saving control system, excavator and method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103233494B (en) |
| WO (1) | WO2014180189A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233494B (en) * | 2013-05-09 | 2015-09-16 | 上海三一重机有限公司 | A kind of energy-saving control system, excavator and method |
| CN103452162A (en) * | 2013-08-19 | 2013-12-18 | 山重建机有限公司 | Negative-flow energy saving device of hydraulic excavator |
| CN104153925B (en) * | 2014-08-19 | 2017-03-29 | 上海三一重机有限公司 | A kind of excavator fuel oil automatic fitration structure and its filter method and its excavator |
| CN105133687B (en) * | 2015-09-14 | 2017-09-15 | 山河智能装备股份有限公司 | Excavator energy saver opens and closes control method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08128406A (en) * | 1994-10-31 | 1996-05-21 | Hitachi Constr Mach Co Ltd | Hydraulic driving device |
| JP4302017B2 (en) * | 2004-08-27 | 2009-07-22 | 株式会社小松製作所 | Hydraulic circuit for construction machinery |
| CN202401511U (en) * | 2011-11-25 | 2012-08-29 | 徐州徐工挖掘机械有限公司 | Novel current-limiting control system of excavator |
| CN202450565U (en) * | 2011-12-22 | 2012-09-26 | 福田雷沃国际重工股份有限公司 | Automatic boosting device of excavator |
| CN102937085A (en) * | 2012-11-16 | 2013-02-20 | 无锡汇虹机械制造有限公司 | Displacement adjusting method for positive-flow hydraulic pump of excavator |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3550260B2 (en) * | 1996-09-30 | 2004-08-04 | コベルコ建機株式会社 | Actuator operating characteristic control device |
| JP3533085B2 (en) * | 1998-04-23 | 2004-05-31 | コベルコ建機株式会社 | Pump control device for construction machinery |
| JP5380240B2 (en) * | 2009-10-13 | 2014-01-08 | 日立建機株式会社 | Hydraulic drive device for work machine |
| JP2011106591A (en) * | 2009-11-18 | 2011-06-02 | Hitachi Constr Mach Co Ltd | Hydraulic driving device of construction machine |
| CN102011416B (en) * | 2010-11-03 | 2012-07-18 | 三一重机有限公司 | Hydraulic excavator flow rate control method and control loop |
| CN102733442B (en) * | 2011-04-02 | 2015-07-22 | 柳工常州机械有限公司 | Gyration energy recycling system of hydraulic excavator |
| CN103233494B (en) * | 2013-05-09 | 2015-09-16 | 上海三一重机有限公司 | A kind of energy-saving control system, excavator and method |
-
2013
- 2013-05-09 CN CN201310170562.6A patent/CN103233494B/en not_active Expired - Fee Related
-
2014
- 2014-03-24 WO PCT/CN2014/073924 patent/WO2014180189A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08128406A (en) * | 1994-10-31 | 1996-05-21 | Hitachi Constr Mach Co Ltd | Hydraulic driving device |
| JP4302017B2 (en) * | 2004-08-27 | 2009-07-22 | 株式会社小松製作所 | Hydraulic circuit for construction machinery |
| CN202401511U (en) * | 2011-11-25 | 2012-08-29 | 徐州徐工挖掘机械有限公司 | Novel current-limiting control system of excavator |
| CN202450565U (en) * | 2011-12-22 | 2012-09-26 | 福田雷沃国际重工股份有限公司 | Automatic boosting device of excavator |
| CN102937085A (en) * | 2012-11-16 | 2013-02-20 | 无锡汇虹机械制造有限公司 | Displacement adjusting method for positive-flow hydraulic pump of excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014180189A1 (en) | 2014-11-13 |
| CN103233494A (en) | 2013-08-07 |
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