CN103774712A - Energy-saving control method for positive flow control hydraulic system - Google Patents
Energy-saving control method for positive flow control hydraulic system Download PDFInfo
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- CN103774712A CN103774712A CN201310690454.1A CN201310690454A CN103774712A CN 103774712 A CN103774712 A CN 103774712A CN 201310690454 A CN201310690454 A CN 201310690454A CN 103774712 A CN103774712 A CN 103774712A
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Abstract
The invention discloses an energy-saving control method for a positive flow control hydraulic system, and belongs to the field of mechanical control. The energy-saving control method is suitable for the positive flow control hydraulic system and includes the steps that a precursor requirement flow is calculated according to a plurality of signals of a precursor handle; the maximum flow of a main pump is calculated according to signals of the main pump; the torque load control amount is output in a PID mode according to the stall value of an engine; the upstream and downstream differential pressure of a valve element is calculated according to upstream pressure and downstream pressure of the valve element and output in a PID mode to serve as the valve element load control amount; the smaller value of the precursor requirement flow and the maximum flow of the main pump serves as a control flow, and the control flow minus the torque load control amount and the valve element load control amount to serve as the final output flow. According to the technical scheme, the match between the discharge capacity and opening characteristics of the valve element is optimized, press loss of the valve element is reduced, and the energy-saving effect is achieved.
Description
Technical field
The invention belongs to plant equipment control field, relate to a kind of energy-saving control method, relate in particular to one and be applicable to positive flow control hydraulic system energy-saving 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 the also output of passing ratio valve control hydraulic pump discharge.Positive flow control hydraulic system is exactly wherein a kind of.
A kind of positive flow control flow rate of hydraulic system control basic principle as shown in Figure 1.Through the corresponding each pilot handle demand volume of pilot pressure of pilot handle control, and the maximum value of getting each demand volume is as guide's demand volume.Determine main pump maximum stream flow according to the main pump pressure of main pump pressure-flow curve and collection.Get the minimum value of guide's demand volume and main pump maximum stream flow as controlling flow, deduct moment of torsion PID output flow as final output flow.
But the design of guide's demand volume is poor with the open nature matching of spool in prior art, can cause the excessive pressure reduction in spool front and back, 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 the negative control amount of pressure differential detection PID output spool before and after spool, and impact output discharge capacity, thus optimize mating of discharge capacity and valve core opening characteristic, reduction spool crushing, reaches energy-saving effect.
For achieving the above object, concrete technical scheme is as follows:
A kind of positive flow control hydraulic system energy-saving control method, be applicable to positive flow control hydraulic 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, goes out guide's demand volume according to the calculated signals of described some pilot handles;
Step 2, goes out main pump maximum stream flow according to the calculated signals of described main pump;
Step 3, is output as the negative control amount of moment of torsion according to the stall value of described motor by PID mode;
Step 4, calculates spool front and back pressure reduction according to the upstream pressure of described spool and downstream pressure, is output as the negative control amount of spool 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 the negative control amount of moment of torsion and the negative control amount of spool as final output flow.
Preferably, in described step 1, calculate guide's demand volume according to the pilot pressure of described some pilot handles.
Preferably, in described step 1, calculate some demand volumes according to the pilot pressure of described some pilot handles and by pilot pressure-flow curve, the maximum value of getting in some demand volumes is guide's demand volume.
Preferably, in described step 2, calculate main pump maximum stream flow according to the pressure gauge of described main pump.
Preferably, in described step 2, calculate main pump maximum stream flow according to the pressure of described main pump and by main pump pressure-flow opisometer.
Preferably, described in described step 2, main pump is operated in permanent power curve.
Preferably, also comprise connected controller and pressure sensor, described pressure sensor is located on described main pump, pilot handle and spool.
With respect 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, reduce the pressure reduction of spool front and back, reaching can effect;
2, because positive flow control system has increased spool front and back pressure differential detection PID, can increase mildness, reduce the operating compression shock of system.
Accompanying drawing explanation
The accompanying drawing that forms 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 is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is positive flow control flow rate of hydraulic system control schematic diagram in prior art;
Fig. 2 is the control flow schematic diagram of the embodiment of the present invention.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the present invention can combine mutually.
Below with reference to accompanying drawing, embodiments of the invention are done to concrete explaination.
The excavator of a kind of positive flow control hydraulic system energy-saving control method of embodiments of the invention as shown in Figure 2.Be applicable to positive flow control hydraulic 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, goes out guide's demand volume according to the calculated signals of some pilot handles;
By each pilot handle pressure sensor is installed, controller gathers pressure on each pilot handle, draws the demand output flow of each pilot pressure to front and back pump by each pilot pressure-flow curve 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, goes out main pump maximum stream flow according to the calculated signals of main pump;
Utilize engine output for meeting maximum, for real engine match condition, carry out permanent Power Limitation according to the operating pressure of pump.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 in permanent power curve.Determine main pump maximum stream flow according to the main pump pressure of main pump pressure-flow curve and collection.
Step 3, is output as the negative control amount of moment of torsion according to the stall value of described motor by PID mode;
Consider that when load increases, certain speed of falling can occur motor.Input quantity using stall value as moment of torsion PID, is output as the negative control amount of moment of torsion.
Step 4, calculates spool front and back pressure reduction according to the upstream pressure of described spool and downstream pressure, is output as the negative control amount of spool by PID mode;
Cause the excessive crushing in spool front and back for positive flow and valve core opening characteristic matching 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) detects PID.Δ p detects the negative control amount of PID output spool, the final output of impact discharge capacity, thus optimize mating of discharge capacity and valve core opening characteristic, reduction spool crushing, reach energy-saving effect.In addition, positive flow control system has increased Δ p and has detected PID, can increase mildness, has reduced the operating compression shock of system.
Step 5, using the smaller value of guide's demand volume and main pump maximum stream flow as controlling flow, and deducts the negative control amount of moment of torsion and the negative control amount of spool as final output flow.
Embodiments of the invention calculate spool front and back pressure reduction by detection upstream pressure, downstream pressure. and increase spool front and back pressure differential detection PID, detect the negative control amount of PID output, impact output discharge capacity, provide mating of discharge capacity and valve core opening characteristic thereby optimize, reduce spool crushing, reach energy-saving effect.
Above specific embodiments of the invention be have been described in detail, 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 alternative also all among category of the present invention.Therefore, equalization conversion and the modification done without departing from the spirit and scope of the invention, all should contain within the scope of the invention.
Claims (7)
1. a positive flow control hydraulic system energy-saving control method, be applicable to positive flow control hydraulic 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, goes out guide's demand volume according to the calculated signals of described some pilot handles;
Step 2, goes out main pump maximum stream flow according to the calculated signals of described main pump;
Step 3, is output as the negative control amount of moment of torsion according to the stall value of described motor by PID mode;
Step 4, calculates spool front and back pressure reduction according to the upstream pressure of described spool and downstream pressure, is output as the negative control amount of spool 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 the negative control amount of moment of torsion and the negative control amount of spool as final output flow.
2. positive flow control hydraulic system energy-saving control method as claimed in claim 1, is characterized in that, in described step 1, calculates guide's demand volume according to the pilot pressure of described some pilot handles.
3. positive flow control hydraulic system energy-saving control method as claimed in claim 2, it is characterized in that, in described step 1, calculate some demand volumes according to the pilot pressure of described some pilot handles and by pilot pressure-flow curve, the maximum value of getting in some demand volumes is guide's demand volume.
4. positive flow control hydraulic system energy-saving control method as claimed in claim 1, is characterized in that, in described step 2, calculates main pump maximum stream flow according to the pressure gauge of described main pump.
5. positive flow control hydraulic system energy-saving control method as claimed in claim 4, is characterized in that, in described step 2, calculates main pump maximum stream flow according to the pressure of described main pump and by main pump pressure-flow opisometer.
6. positive flow control hydraulic system energy-saving control method as claimed in claim 5, is characterized in that, described in described step 2, main pump is operated in permanent power curve.
7. positive flow control hydraulic system energy-saving control method as claimed in claim 1, 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047328A (en) * | 2014-06-24 | 2014-09-17 | 上海华兴数字科技有限公司 | Excavator positive flow control method |
| CN107201761A (en) * | 2017-06-05 | 2017-09-26 | 柳州柳工挖掘机有限公司 | Excavate Electrical Control positive flow control method |
| 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 |
| CN115478581A (en) * | 2022-10-27 | 2022-12-16 | 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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047328A (en) * | 2014-06-24 | 2014-09-17 | 上海华兴数字科技有限公司 | Excavator positive flow control method |
| 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 |
| CN107201761A (en) * | 2017-06-05 | 2017-09-26 | 柳州柳工挖掘机有限公司 | Excavate Electrical Control positive flow control method |
| 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 |
| CN115478581A (en) * | 2022-10-27 | 2022-12-16 | 潍柴动力股份有限公司 | Control method and control device of hydraulic system and engineering vehicle |
| 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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| CN103774712B (en) | 2016-04-27 |
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