CN103774712B - A kind of positive flow hydraulic control energy saving of system control method - Google Patents
A kind of positive flow hydraulic control energy saving of system control method Download PDFInfo
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- CN103774712B CN103774712B CN201310690454.1A CN201310690454A CN103774712B CN 103774712 B CN103774712 B CN 103774712B CN 201310690454 A CN201310690454 A CN 201310690454A CN 103774712 B CN103774712 B CN 103774712B
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Abstract
The invention discloses a kind of positive flow hydraulic control energy saving of system control method, belong to Mechanical course field, be applicable to positive flow hydraulic control system, comprise: the signal according to described some pilot handles calculates guide's demand volume; Main pump maximum stream flow is calculated according to the signal of described main pump; Stall value according to described motor exports as moment of torsion bears control amount by PID mode; Calculate pressure reduction before and after spool according to the upstream pressure of described spool and downstream pressure, export as spool bears control amount by PID mode; Using the smaller value of described guide's demand volume and main pump maximum stream flow as controlling flow, and deduct moment of torsion and bear control amount and spool bears control amount as final output flow.Technical scheme of the present invention optimizes mating of discharge capacity and valve core opening characteristic, reduces spool crushing, reaches energy-saving effect.
Description
Technical field
The invention belongs to plant equipment control field, relate to a kind of energy-saving control method, particularly relate to one and be applicable to positive flow hydraulic control energy saving of system control method.
Background technology
Hydraulic pump, as the hydraulic power output source of hydraulic crawler excavator, is and important building block in excavator.For coordinating the work of whole hydraulic system efficient stable, the control mode of hydraulic pump of the prior art generally adopts the mode of electric liquid Comprehensive Control.Gather various control and feedback signal by electrical control system, judge and the output of passing ratio valve hydraulic control pumpage.Positive flow hydraulic control system is exactly wherein a kind of.
A kind of positive flow hydraulic control flow system flow as shown in Figure 1 controls general principle.Through the corresponding each pilot handle demand volume of pilot pressure that pilot handle controls, and the maximum value of getting each demand volume is as guide's demand volume.According to the main pump pressure determination main pump maximum stream flow of main pump Pressure-flow curves and collection.The minimum value of getting guide's demand volume and main pump maximum stream flow, as control flow, deducts moment of torsion PID output flow as final output flow.
But in prior art, the design of guide's demand volume is poor with the open nature matching of spool, can cause pressure reduction excessive before and after spool, cause unnecessary energy dissipation.
Summary of the invention
In view of this, the present invention is by detecting pressure reduction before and after spool. and increase pressure differential detection PID before and after spool and export spool and bear control amount, impact exports discharge capacity, thus optimizes mating of discharge capacity and valve core opening characteristic, and reduction spool crushing, reaches energy-saving effect.
For achieving the above object, concrete technical scheme is as follows:
A kind of positive flow hydraulic control energy saving of system control method, be applicable to positive flow hydraulic control system, described hydraulic system comprises main pump and motor, and described main pump is connected with control valve, described control valve is provided with spool and some pilot handles, and described energy-saving control method comprises:
Step 1, the signal according to described some pilot handles calculates guide's demand volume;
Step 2, calculates main pump maximum stream flow according to the signal of described main pump;
Step 3, the stall value according to described motor exports as moment of torsion bears control amount by PID mode;
Step 4, calculates pressure reduction before and after spool according to the upstream pressure of described spool and downstream pressure, exports as spool bears control amount by PID mode;
Step 5, using the smaller value of described guide's demand volume and main pump maximum stream flow as controlling flow, and deducts moment of torsion and bears control amount and spool bears control amount as final output flow.
Preferably, guide's demand volume is calculated according to the pilot pressure of described some pilot handles in described step 1.
Preferably, calculate some demand volumes according to the pilot pressure of described some pilot handles in described step 1 by pilot pressure-flow curve, the maximum value of getting in some demand volumes is guide's demand volume.
Preferably, main pump maximum stream flow is calculated according to the pressure gauge of described main pump in described step 2.
Preferably, main pump maximum stream flow is calculated by main pump Pressure-flow curves according to the pressure of described main pump in described step 2.
Preferably, described in described step 2, main pump is operated on invariable power curve.
Preferably, also comprise connected controller and pressure sensor, described pressure sensor is located on described main pump, pilot handle and spool.
Relative to prior art, the advantage of technical scheme of the present invention has:
1, by increasing pressure differential detection PID before and after spool, make to provide discharge capacity and valve core opening characteristic matched well, the pressure reduction before and after reduction spool, reaching can effect;
2, because positive flow control system adds pressure differential detection PID before and after spool, can mildness be increased, reduce the compression shock in system cloud gray model.
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 that in prior art, positive flow hydraulic control flow system flow controls schematic diagram;
Fig. 2 is the control flow schematic diagram of the embodiment of the present invention.
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.
The excavator of a kind of positive flow hydraulic control energy saving of system control method of embodiments of the invention as shown in Figure 2.Be applicable to positive flow hydraulic control system, hydraulic system comprises main pump and motor, and main pump is connected with control valve, and control valve is provided with spool and some pilot handles.Energy-saving control method comprises:
Step 1, calculates guide's demand volume according to the signal of some pilot handles;
By installing each pilot handle pressure sensor, controller gathers pressure on each pilot handle, draws the demand output flow of each pilot pressure to front and back pump by pilot pressure-flow curve each in controller.By contrasting each action demand output flow maximum value, finally draw pilot handle-front and back demand pump output flow controlling value.
Step 2, calculates main pump maximum stream flow according to the signal of main pump;
Maximumly utilize engine output for meeting, for real engine match condition, the operating pressure according to pump carries out invariable power restriction.By at main pump body setting pressure sensor, gather the actual pressure output situation of main pump, limit for the main pump flow upper limit.Main pump is operated on invariable power curve.According to the main pump pressure determination main pump maximum stream flow of main pump Pressure-flow curves and collection.
Step 3, the stall value according to described motor exports as moment of torsion bears control amount by PID mode;
When considering that load increases, motor can occur certain to fall speed.Using the input quantity of stall value as moment of torsion PID, export as moment of torsion bears control amount.
Step 4, calculates pressure reduction before and after spool according to the upstream pressure of described spool and downstream pressure, exports as spool bears control amount by PID mode;
Crushing excessive before and after spool is caused for positive flow and valve core opening characteristics match missionary society, cause energy loss, embodiments of the invention are by detecting upstream pressure (p1), downstream pressure (p2), calculate pressure reduction before and after spool (Δ p), and increase pressure reduction before and after spool (Δ p) and detect PID.Δ p detects PID and exports spool and bear control amount, and impact finally exports discharge capacity, thus optimizes mating of discharge capacity and valve core opening characteristic, and reduction spool crushing, reaches energy-saving effect.In addition, positive flow control system adds Δ p and detects PID, can increase mildness, reduce the compression shock in system cloud gray model.
Step 5, using the smaller value of guide's demand volume and main pump maximum stream flow as controlling flow, and deducts moment of torsion and bears control amount and spool bears control amount as final output flow.
Embodiments of the invention calculate pressure reduction before and after spool by detection upstream pressure, downstream pressure. and increase pressure differential detection PID before and after spool, detect PID and export negative control amount, impact exports discharge capacity, thus optimize and provide mating of discharge capacity and valve core opening characteristic, reduce spool crushing, reach energy-saving effect.
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 (5)
1. a positive flow hydraulic control energy saving of system control method, be applicable to positive flow hydraulic control system, described hydraulic system comprises main pump and motor, described main pump is connected with control valve, described control valve is provided with spool and some pilot handles, it is characterized in that, described energy-saving control method comprises:
Step 1, the signal according to described some pilot handles calculates guide's demand volume;
Step 2, calculates main pump maximum stream flow according to the signal of described main pump;
Step 3, the stall value according to described motor exports as moment of torsion bears control amount by PID mode;
Step 4, calculates pressure reduction before and after spool according to the upstream pressure of described spool and downstream pressure, exports as spool bears control amount by PID mode;
Step 5, using the smaller value of described guide's demand volume and main pump maximum stream flow as controlling flow, and deducts moment of torsion and bears control amount and spool bears control amount as final output flow;
Wherein, guide's demand volume is calculated according to the pilot pressure of described some pilot handles in described step 1;
Calculate some demand volumes by pilot pressure-flow curve according to the pilot pressure of described some pilot handles in described step 1, the maximum value of getting in some demand volumes is guide's demand volume.
2. positive flow hydraulic control energy saving of system control method as claimed in claim 1, is characterized in that, calculate main pump maximum stream flow in described step 2 according to the pressure gauge of described main pump.
3. positive flow hydraulic control energy saving of system control method as claimed in claim 2, is characterized in that, calculates main pump maximum stream flow in described step 2 according to the pressure of described main pump by main pump Pressure-flow curves.
4. positive flow hydraulic control energy saving of system control method as claimed in claim 3, it is characterized in that, described in described step 2, main pump is operated on invariable power curve.
5. positive flow hydraulic control energy saving of system control method as claimed in claim 1, it is characterized in that, also comprise connected controller and pressure sensor, described pressure sensor is located on described main pump, pilot handle and spool.
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| CN201310690454.1A CN103774712B (en) | 2013-12-16 | 2013-12-16 | A kind of positive flow hydraulic control energy saving of system control method |
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| CN201310690454.1A CN103774712B (en) | 2013-12-16 | 2013-12-16 | A kind of positive flow hydraulic control energy saving of system control method |
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| CN103774712B true CN103774712B (en) | 2016-04-27 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047328B (en) * | 2014-06-24 | 2017-01-18 | 上海华兴数字科技有限公司 | Excavator positive flow control method |
| CN107201761B (en) * | 2017-06-05 | 2020-07-17 | 柳州柳工挖掘机有限公司 | Electric control positive flow control method for excavator |
| CN110685310A (en) * | 2019-10-11 | 2020-01-14 | 徐州徐工基础工程机械有限公司 | Engine extreme load control method and system based on neural network and engineering vehicle |
| CN115355212A (en) * | 2022-07-11 | 2022-11-18 | 上海诺玛液压系统有限公司 | Intelligent control digital multi-way valve working connection |
| CN115478581B (en) * | 2022-10-27 | 2024-04-16 | 潍柴动力股份有限公司 | Control method and control device of hydraulic system and engineering vehicle |
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| CN102296665A (en) * | 2011-06-23 | 2011-12-28 | 上海三一重机有限公司 | Excavator hydraulic system carrying load sensing main valve and positive flow pump |
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| JPH02128026A (en) * | 1988-11-07 | 1990-05-16 | Hitachi Constr Mach Co Ltd | Hydraulic circuit of hydraulic system excavator |
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| US6253136B1 (en) * | 1999-03-31 | 2001-06-26 | Caterpillar Inc. | Method and apparatus for a limp home mode |
| CN102296665A (en) * | 2011-06-23 | 2011-12-28 | 上海三一重机有限公司 | Excavator hydraulic system carrying load sensing main valve and positive flow pump |
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