CN102536761A - Engineering machinery as well as power control system and power control method of non-electrically-controlled hydraulic pump - Google Patents
Engineering machinery as well as power control system and power control method of non-electrically-controlled hydraulic pump Download PDFInfo
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- CN102536761A CN102536761A CN2011104419398A CN201110441939A CN102536761A CN 102536761 A CN102536761 A CN 102536761A CN 2011104419398 A CN2011104419398 A CN 2011104419398A CN 201110441939 A CN201110441939 A CN 201110441939A CN 102536761 A CN102536761 A CN 102536761A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 238000001595 flow curve Methods 0.000 claims description 8
- 239000003921 oil Substances 0.000 description 85
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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Abstract
The invention provides engineering machinery as well as a power control system and a power control method of a non-electrically-controlled hydraulic pump, wherein the control system comprises a power regulator; the power regulator is connected with an actuating element, and is connected with a first signal oil input inlet and a second signal oil input inlet of the non-electrically-controlled hydraulic pump through a first signal oil channel and a second signal oil channel respectively so as to control the displacement of the non-electrically-controlled hydraulic pump according to the load pressure; a third signal oil channel is further arranged between the second signal oil input inlet of the non-electrically-controlled hydraulic pump and an output outlet of the non-electrically-controlled hydraulic pump, and is provided with an electrically controlled valve; and a control end of the electrically controlled valve is connected with a control module. The engineering machinery comprises the non-electrically-controlled hydraulic pump, and the system above is adopted as the power control system of the non-electrically-controlled hydraulic pump. The control method comprises the following steps of: determining the operation state of an engine, and controlling the non-electrically-controlled hydraulic pump to be switched to the corresponding operating mode according to the operation state of the engine. The secondary regulation of the power for the non-electrically-controlled hydraulic pump can be realized through the control system and the control method.
Description
Technical field
The present invention relates to non-electric-controlled hydraulic pump, particularly a kind of power control system of non-electric-controlled hydraulic pump and controlling method, and relate to the engineering machinery that adopts this power control system.
Background technique
Because non-electric-controlled hydraulic pump (like BOSCH-REXROTH A11VO75LRDS series) the higher reason of cost performance has obtained using widely at present on mini-excavator.In order to reach purpose of energy saving, in the using process of excavator, generally can select different engine speed according to the difference of operation operating mode.But the non-electric-controlled hydraulic pump of A11VO75LRDS series only has a pressure flow curve (P-Q curve) (as shown in Figure 2), so under the different work operating mode, the motor of said non-electric-controlled hydraulic pump and the power match problem between the oil hydraulic pump just become core.
As shown in Figure 1, in the correlation technique, when engine running, oil hydraulic pump 1 is pumped into executive component 2 from fuel tank through the P mouth with hydraulic oil, and executive component 2 feeds back to induced pressure the B mouth of power governor 3 in when action through LS mouth (feedback signal is oily).Power governor 3, is wherein set up pressure from the signal oil of C mouth at the D of oil hydraulic pump 1 mouth the swash plate of oil hydraulic pump 1 is promoted clockwise from E mouth and C mouth output signal oil according to the pressure of B mouth; Set up pressure from the signal oil of E mouth at the F of oil hydraulic pump 1 mouth the swash plate of oil hydraulic pump 1 is rotated counterclockwise, the swash plate of oil hydraulic pump 1 keeps several angle to export corresponding flow when the pressure balance of D mouth and F mouth.Fig. 2 is the pressure flow curve of the oil hydraulic pump 1 in the correlation technique.
There is following defective in correlation technique: 1. the absorbed power owing to oil hydraulic pump only is directly proportional with induced pressure and flow product; When under the certain situation of engine throttle, needing reduction oil hydraulic pump absorbed power to hang down loaded work piece in the real work (for example smooth operation); Power control system in the correlation technique can't be realized the secondary adjustment, does not therefore reach purpose of energy saving.2. the absorption moment of torsion of motor oil hydraulic pump when little throttle is worked may cause motor flame-out phenomenon when the slow-speed of revolution, possibly occur greater than engine output torque.
Summary of the invention
The present invention aims to provide a kind of power control system, Poewr control method of improved non-electric-controlled hydraulic pump, and the engineering machinery that has this control system.
The present invention provides a kind of power control system of non-electric-controlled hydraulic pump; Comprise power governor; This power governor is connected with executive component; And be connected the first signal oil inlet opening and secondary signal oil inlet opening of said non-electric-controlled hydraulic pump respectively through the first signal oil passage and secondary signal oil passage, to control said non-electric-controlled hydraulic pump delivery according to induced pressure, between the delivery outlet of oily inlet opening of the secondary signal of said non-electric-controlled hydraulic pump and said non-electric-controlled hydraulic pump the 3rd signal oil passage is set; Said the 3rd signal oil passage is provided with electric control valve, and the control end of this electric control valve connects a control module.
Preferably, said control module comprises:
Sensing cell is used for the rotating speed of detection of engine;
Storage unit is used to preset a critical value; With
Control unit; Be connected with said sensing cell; When being used for tachometer value in the output of said sensing cell less than said critical value; Control said electric control valve and open, make the 3rd signal oil passage, participate in control said non-electric-controlled hydraulic pump displacement to the secondary signal oil inlet opening of said non-electric-controlled hydraulic pump input signal oil.
Preferably, said control unit also connects a power control switching, is used for manually controlling the state of said electric control valve.
Preferably, said control module comprises a power control switching, is used for manually controlling the state of said electric control valve.
The present invention also provides a kind of engineering machinery, comprises non-electric-controlled hydraulic pump and above-mentioned power control system in each.
The present invention also provides a kind of Poewr control method of non-electric-controlled hydraulic pump, and this non-electric-controlled hydraulic pump comprises first mode of operation and second mode of operation, and said non-electric-controlled hydraulic pump has different pressure flow curves under said first, second mode of operation; This Poewr control method comprises the steps:
Judge the working state of motor;
According to the working state of motor, control said non-electric-controlled hydraulic pump and switch under the corresponding work mode.
Preferably, the step of the working state of said judgement motor comprises: the rotating speed of detection of engine, and with detected rotating speed and a critical value comparison of presetting.
Preferably, said working state according to motor, control the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode and comprise:
When the rotating speed of motor during more than or equal to said critical value, said non-electric-controlled hydraulic pump switches to first mode of operation;
When the rotating speed of motor during less than said critical value, said non-electric-controlled hydraulic pump switches to second mode of operation.
Preferably, this Poewr control method also comprises the steps:
A power governor is provided; This power governor is connected with executive component; And be connected the first signal oil inlet opening and the oily inlet opening of secondary signal of said non-electric-controlled hydraulic pump respectively through the first signal oil passage and secondary signal oil passage, to control said non-electric-controlled hydraulic pump delivery according to induced pressure;
One the 3rd signal oil passage is provided, and the 3rd signal oil passage is arranged between the delivery outlet of secondary signal oil inlet opening and said non-electric-controlled hydraulic pump of said non-electric-controlled hydraulic pump, and said the 3rd signal oil passage is provided with electric control valve;
Wherein, Said working state according to motor; Controlling the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode comprises: according to the working state of motor, control said electric control valve and close or open, so that said non-electric-controlled hydraulic pump switches under the corresponding work mode.
Preferably, said working state according to motor, control the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode and comprise:
The rotating speed of detection of engine, and with detected rotating speed and a critical value comparison of presetting;
When the rotating speed of motor during more than or equal to said critical value, said electric control valve is closed, and said non-electric-controlled hydraulic pump switches to said first mode of operation;
When the rotating speed of motor during less than said critical value; Said electric control valve is opened; Make said the 3rd signal oil passage to the secondary signal oil inlet opening of said non-electric-controlled hydraulic pump input signal oil; Participation is to the control of said non-electric-controlled hydraulic pump displacement, and said non-electric-controlled hydraulic pump switches to said second mode of operation.
Preferably; Said working state according to motor; Controlling the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode comprises: according to the working state of motor; Manually the said electric control valve of control is closed or is opened, so that said non-electric-controlled hydraulic pump switches to corresponding work mode.
Compare with correlation technique, power control system of the present invention and controlling method can realize the secondary adjustment of non-electric-controlled hydraulic pump absorbed power when the motor underloading is worked, reach purpose of energy saving.
In addition; Power control system of the present invention and method; Can make motor when the slow-speed of revolution, automatically the absorption moment of torsion of oil hydraulic pump reduced (moment of torsion is directly proportional with power under the certain situation of rotating speed), prevent that low engine speed is flame-out, thereby can prolong the working life of motor.
Description of drawings
Fig. 1 is the schematic diagram of the power control system of the non-electric-controlled hydraulic pump in the correlation technique.
Fig. 2 is the pressure flow curve of non-electric-controlled hydraulic pump in the correlation technique.
Fig. 3 is the schematic diagram of the power control system of the non-electric-controlled hydraulic pump in the some embodiments of the invention.
Fig. 4 is the pressure flow curve of the non-electric-controlled hydraulic pump in the some embodiments of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done explanation further.
Fig. 3 shows the schematic diagram of the power control system of the non-electric-controlled hydraulic pump in the some embodiments of the invention.As shown in Figure 3; The power control system of this non-electric-controlled hydraulic pump can comprise power governor 3; Power governor 3 is connected with executive component 2, and power governor 3 connects the first signal oil inlet opening D of oil hydraulic pump 1 through the first signal oil passage 4, and passes through the secondary signal oil inlet opening F that secondary signal oil passage 5 connects oil hydraulic pumps 1; With angle, and then control non-electric-controlled hydraulic pump delivery according to the swash plate of induced pressure control oil hydraulic pump 1.Between the secondary signal oil inlet opening F of oil hydraulic pump 1 and the delivery outlet P of oil hydraulic pump 1 the 3rd signal oil passage 6 is set; The 3rd signal oil passage 6 is provided with electric control valve 7; The control end of electric control valve 7 connects a control module 8, in order to realize the secondary adjustment of non-electric-controlled hydraulic pump absorbed power.
In certain embodiments, control unit 81 also can connect a power control switching 83, is used for manually controlling the state of electric control valve 7.When the state of this power control switching 83 changes, the state turnover of control unit 81 output SC sigmal control electric control valves 7.Therefore, the operator can not only enrich the ability of applicable working condition according to the absorbed power of actual conditions through power control switching 83 selection oil hydraulic pumps 1, has also practiced thrift energy consumption simultaneously, makes and operates hommization more.
Above-mentioned power control system can be realized the secondary power control of non-electric-controlled hydraulic pump 1 through automatic control mode and manual control mode.
Automatic control mode is following:
The rotating speed of detection of engine; Compare with the critical value that presets; When critical value that sensing cell 82 detected engine speed preset in more than or equal to storage unit, control unit 81 stops to make electric control valve 7 be in power failure state to electric control valve 7 output signals; Therefore the pressure of the outlet P1 of electric control valve 7 output is zero; This moment, hydraulic system only depended on the absorbed power of 3 pairs of oil hydraulic pumps 1 of self power governor to adjust, and the adjustment principle is identical with correlation technique with process, that is: when engine running; Oil hydraulic pump 1 is pumped into executive component 2 with hydraulic oil from the delivery outlet P of fuel tank through oil hydraulic pump 1, and executive component 2 feeds back to induced pressure the B mouth of power governor 3 through the LS mouth when action.Power governor 3 is exported signal oil according to the pressure of B mouth from E mouth and C mouth, wherein sets up swash plate that pressure in the direction of the clock promote oil hydraulic pump 1 through the first signal oil passage 4 at the first signal oil inlet opening D of oil hydraulic pump 1 from the signal oil of C mouth; Signal oil from the E mouth is set up pressure by the swash plate that counterclockwise promotes oil hydraulic pump 1 through secondary signal oil passage 5 at the secondary signal oil inlet opening F of oil hydraulic pump 1; The swash plate of oil hydraulic pump 1 keeps several angle when the pressure balance of two signal oil inlet opening D and F, exports corresponding flow.At this moment, oil hydraulic pump 1 works in first mode of operation, and the pressure flow curve of oil hydraulic pump 1 is shown in the curve among Fig. 4 41.
When critical value that sensing cell 82 detected engine speed preset in less than storage unit; Control unit 81 is to electric control valve 7 output signals; Make electric control valve 7 be in electricity condition, electric control valve 7 outlet this moment P1 can export setup pressure value, the secondary signal oil inlet opening F that this force value directly is loaded into oil hydraulic pump 1 forces the swash plate of oil hydraulic pump 1 to be rotated counterclockwise; Till the pressure balance of oil hydraulic pump 1 two signal oil inlet openings D and F; Hydraulic system also receives the influence of electric control valve 7 outlet pressures except that the absorbed power of leaning on 3 pairs of oil hydraulic pumps 1 of self power governor is adjusted at this moment, and promptly the 3rd signal oil passage 6 has been participated in the angle control to the swash plate of oil hydraulic pump 1; Realized the secondary adjustment of oil hydraulic pump power; At this moment, oil hydraulic pump 1 works in second mode of operation, the pressure flow curve of oil hydraulic pump 1 such as the curve 42 among Fig. 4.
Manual control mode is following:
When motor is in the large throttle working state but needs the work of oil hydraulic pump small-power, can pass through operand power control switch 83 closures, after being grounded, control unit 81 stitch that be connected with power control switching 83 this moment are in low level; When control unit 81 detects this stitch and is low level immediately to electric control valve 7 output signals, electric control valve 7 electric after, the 3rd signal oil passage 6 is connected; Participation is to the angle control of the swash plate of oil hydraulic pump 1; Make oil hydraulic pump 1 work in second mode of operation, otherwise, power control switching 83 is broken off; Then can make oil hydraulic pump 1 work in first mode of operation, thereby realize carrying out the purpose of power control according to operator's wish.
Among some embodiments, electric control valve 7 adopts solenoid valve.
Among some embodiments, control module 8 can not comprise power control switching 83, includes only control unit 81, sensing cell 82 and storage unit, can realize the secondary adjustment of non-electric-controlled hydraulic pump 1 absorbed power like this according to engine speed automatically.
And in other embodiment; Control module 8 also can not comprise control unit 81, sensing cell 82 and storage unit; Include only a power control switching; This power control switching is connected in the control end of electric control valve 7, is used to change the state of electric control valve 7, can realize the secondary adjustment of non-electric-controlled hydraulic pump 1 absorbed power like this through manually-operable.
Be appreciated that ground, among some embodiments, control module 8 can adopt other sensing cell that is used to test the speed to come the rotating speed of detection of engine.Can use the internal storage unit or the above-mentioned critical value of external cell stores of control unit 81.
In the foregoing description; The power control system of this non-electric-controlled hydraulic pump and controlling method describe to be applied to inclined disc type variable displacement pump; Through to the angle control of the swash plate of inclined disc type variable displacement pump with control hydraulic pressure pump delivery; Be appreciated that ground, the power control system and the controlling method of the non-electric-controlled hydraulic pump of the present invention also can be used for the clino-axis type variable displacement pump.
Above-mentioned various power control system all can be applicable to comprise the engineering machinery of non-electric-controlled hydraulic pump, like excavator etc.And, in certain embodiments, the control unit 81 that is used to control electric control valve 7 in the power control system can adopt the control unit able to programme of this project machinery self (Programmable Logic Controller, PLC); In other embodiment, control unit 81 also can adopt an independently PLC; Perhaps control unit 81 also can adopt common microprocessor.
The above only is a preferred implementation of the present invention, and protection scope of the present invention also not only is confined to the foregoing description, and all technological schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art in the some improvement and the retouching that do not break away under the principle of the invention prerequisite, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (11)
1. the power control system of a non-electric-controlled hydraulic pump; Comprise power governor; This power governor is connected with executive component; And be connected the first signal oil inlet opening and secondary signal oil inlet opening of said non-electric-controlled hydraulic pump respectively through the first signal oil passage and secondary signal oil passage, to control said non-electric-controlled hydraulic pump delivery according to induced pressure, it is characterized in that: between the delivery outlet of oily inlet opening of the secondary signal of said non-electric-controlled hydraulic pump and said non-electric-controlled hydraulic pump the 3rd signal oil passage is set; Said the 3rd signal oil passage is provided with electric control valve, and the control end of this electric control valve connects a control module.
2. power control system according to claim 1 is characterized in that, said control module comprises:
Sensing cell is used for the rotating speed of detection of engine;
Storage unit is used to preset a critical value; With
Control unit; Be connected with said sensing cell; When being used for tachometer value in the output of said sensing cell less than said critical value; Control said electric control valve and open, make the 3rd signal oil passage, participate in control said non-electric-controlled hydraulic pump displacement to the secondary signal oil inlet opening of said non-electric-controlled hydraulic pump input signal oil.
3. power control system according to claim 2 is characterized in that, said control unit also connects a power control switching, is used for manually controlling the state of said electric control valve.
4. power control system according to claim 1 is characterized in that, said control module comprises a power control switching, is used for manually controlling the state of said electric control valve.
5. an engineering machinery comprises non-electric-controlled hydraulic pump, it is characterized in that, also comprises each described power control system of claim 1-4.
6. the Poewr control method of a non-electric-controlled hydraulic pump, this non-electric-controlled hydraulic pump comprises first mode of operation and second mode of operation, said non-electric-controlled hydraulic pump has different pressure flow curves under said first, second mode of operation; This Poewr control method comprises the steps:
Judge the working state of motor;
According to the working state of motor, control said non-electric-controlled hydraulic pump and switch under the corresponding work mode.
7. Poewr control method according to claim 6 is characterized in that, the step of the working state of said judgement motor comprises: the rotating speed of detection of engine, and with detected rotating speed and a critical value comparison of presetting.
8. Poewr control method according to claim 7 is characterized in that, said working state according to motor is controlled the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode and comprised:
When the rotating speed of motor during more than or equal to said critical value, said non-electric-controlled hydraulic pump switches to first mode of operation;
When the rotating speed of motor during less than said critical value, said non-electric-controlled hydraulic pump switches to second mode of operation.
9. Poewr control method according to claim 6 is characterized in that this Poewr control method also comprises the steps:
A power governor is provided; This power governor is connected with an executive component; And be connected the first signal oil inlet opening and the oily inlet opening of secondary signal of said non-electric-controlled hydraulic pump respectively through the first signal oil passage and secondary signal oil passage, to control said non-electric-controlled hydraulic pump delivery according to induced pressure;
One the 3rd signal oil passage is provided, and the 3rd signal oil passage is arranged between the delivery outlet of secondary signal oil inlet opening and said non-electric-controlled hydraulic pump of said non-electric-controlled hydraulic pump, and said the 3rd signal oil passage is provided with electric control valve;
Wherein, Said working state according to motor; Controlling the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode comprises: according to the working state of motor, control said electric control valve and close or open, so that said non-electric-controlled hydraulic pump switches under the corresponding work mode.
10. Poewr control method according to claim 9 is characterized in that, said working state according to motor is controlled the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode and comprised:
The rotating speed of detection of engine, and with detected rotating speed and a critical value comparison of presetting;
When the rotating speed of motor during more than or equal to said critical value, said electric control valve is closed, and said non-electric-controlled hydraulic pump switches to said first mode of operation;
When the rotating speed of motor during less than said critical value; Said electric control valve is opened; Said the 3rd signal oil passage is to the secondary signal oil inlet opening of said non-electric-controlled hydraulic pump input signal oil; Participation is to the control of said non-electric-controlled hydraulic pump displacement, and said non-electric-controlled hydraulic pump switches to said second mode of operation.
11. Poewr control method according to claim 9; It is characterized in that; Said working state according to motor; Controlling the step that said non-electric-controlled hydraulic pump switches under the corresponding work mode comprises: according to the working state of motor, manually control said electric control valve and close or open, said non-electric-controlled hydraulic pump switches to corresponding work mode.
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| CN201110441939.8A CN102536761B (en) | 2011-12-26 | 2011-12-26 | Engineering machinery as well as power control system and power control method of non-electrically-controlled hydraulic pump |
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| CN201110441939.8A CN102536761B (en) | 2011-12-26 | 2011-12-26 | Engineering machinery as well as power control system and power control method of non-electrically-controlled hydraulic pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711598A (en) * | 2013-12-03 | 2014-04-09 | 中联重科股份有限公司 | Hydraulic system adjusting equipment, hydraulic system adjusting method, hydraulic system power matching control system and engineering machinery |
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| CN1008388B (en) * | 1984-11-30 | 1990-06-13 | 株式会社小松制作所 | Fluid operated pump displacement control system |
| US5993168A (en) * | 1995-05-16 | 1999-11-30 | Brueninghaus Hydromatik Gmbh | Settable choke device to control the power setting of a variable displacement hyraulic pump |
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| CN103711598A (en) * | 2013-12-03 | 2014-04-09 | 中联重科股份有限公司 | Hydraulic system adjusting equipment, hydraulic system adjusting method, hydraulic system power matching control system and engineering machinery |
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Application publication date: 20120704 Assignee: Shaanxi Zhonglian Western earthwork Machinery Co.,Ltd. Assignor: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Contract record no.: X2023980042754 Denomination of invention: Power Control System and Control Method for Construction Machinery and Its Non Electric Hydraulic Pumps Granted publication date: 20150107 License type: Common License Record date: 20231010 |
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Application publication date: 20120704 Assignee: Zoomlion earth moving machinery Co.,Ltd. Assignor: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Contract record no.: X2023980043517 Denomination of invention: Power Control System and Control Method for Construction Machinery and Its Non Electric Hydraulic Pumps Granted publication date: 20150107 License type: Common License Record date: 20231017 |