CN104405003A - Pump and valve synchronous control system - Google Patents
Pump and valve synchronous control system Download PDFInfo
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- CN104405003A CN104405003A CN201410592634.0A CN201410592634A CN104405003A CN 104405003 A CN104405003 A CN 104405003A CN 201410592634 A CN201410592634 A CN 201410592634A CN 104405003 A CN104405003 A CN 104405003A
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Abstract
The invention relates to a control system for an excavator machine, in particular to a pump and valve synchronous control system. The system is applied to an excavator and comprises a pilot unit, an engine, a collection unit, a processing unit, a control unit, a first execution unit and a conversion unit, wherein the conversion unit is connected between the control unit and a second execution unit for receiving a control signal, converting the control signal into an execution signal matched with the second execution unit and outputting the execution signal; the second execution unit is used for executing corresponding action according to the execution signal. Compared with the prior art, the pump and valve synchronous control system have the advantages of small flow loss, good economy and short response time by using a pump-controlled speed adjustment and valve-controlled speed adjustment combined control method.
Description
Technical field
The present invention relates to a kind of excavator machinery control system, particularly relate to a kind of pump valve synchronous control system.
Background technology
Excavator, generally includes a scraper bowl, normally utilizes scraper bowl to excavate the material holding machine side higher or lower than excavator, and loads haulage vehicle or unload the earth moving plant to rickyard.From the development of engineering machinery in recent years, the development of excavator is relatively very fast, and excavator has become one of topmost engineering machinery in engineering construction.Along with the needs of the enhancing of people's environmental consciousness, growth in the living standard and workplace, existing excavator adopts in hydraulic valving systems (as hydraulic pressure valve-controlled cylinder, hydraulic pressure valve-controlled motor) mostly, and two load restrictions of hydraulic valve are that machinery connects firmly.When controlling the opening degree of one of them load restriction, the opening degree of another load restriction is also just determined thereupon, and namely the opening degree of two load restrictions is identical all the time.The effect of load throttling is regulated by hydraulic oil higher for the pressure before entering restriction to become the lower hydraulic oil of pressure, to be met the hydraulic energy source of demand.The pressure differential at restriction two ends is called the pressure loss, and this pressure loss is consumed by the form of heat.Therefore the operating efficiency of general hydraulic valving systems is not high, and radiating effect is poor, there is larger energy waste, and environmental pollution is larger.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of pump valve synchronous control system, be applied to excavator, comprise pilot unit, motor, wherein, comprise
Collecting unit, is arranged at a predetermined function unit place of described excavator, and in order to obtain the collection signal at described predetermined function unit place, and the signal of telecommunication that formation and described collection signal match exports;
Processing unit, connects described collecting unit, for receiving the signal of telecommunication that described collecting unit exports, and forms processed detection signal output;
Control unit, connects described processing unit, for comparing judgement to described detection signal, and forms a control signal output;
First performance element, connects described control unit, is used to described control signal and acts on the work that execution matches with it;
Conversion unit, be connected between described control unit and one second performance element, be converted into the executive signal that matches with described second performance element for receiving described control signal and export, described second performance element performs corresponding action according to described executive signal.
Preferably, described collection signal comprises the pressure signal of output of described engine rotational speed signal, described first performance element, the flow signal of the output of described second performance element, the pressure signal of described pilot unit.
Preferably, described processing unit is used for doing filtering, amplitude limit, computing to the described signal of telecommunication, produces the first performance element pressure signal, the first performance element flow signal, the pilot pressure signal that match with described control unit input, and exports.
Preferably, described control unit comprises power calculation unit, connects described processing unit, for receiving described first performance element pressure signal, the first performance element flow signal, forming a power signal and exporting under a predetermined control method; Invariable power PID, connects described power calculation unit, calibration power signal respectively, for comparing described power signal and described standard signal, producing a comparative result and exporting.
Preferably, described control unit also comprises a pressure conversion unit, connects described processing unit, in order to receive described pilot pressure signal, and is converted into the flow signal output matched with it.
Preferably, described control unit also comprises a subtracter, the input of described subtracter connects the output of described invariable power PID and the output of described pressure conversion unit respectively, forms the output of described control signal in order to deduct described comparative result according to described flow signal.
Preferably, described second performance element also comprises signal lag unit, be connected between described control unit and described second performance element, carry out delay process in order to the described control signal exported described control unit, and form a delay control signal and transfer to described second performance element.
Preferably, described first performance element is formed primarily of the first proportioning valve and main pump, the control end of described first proportioning valve connects the output of described subtracter, the output of described first proportioning valve connects described main pump, in order to receive described control signal, under described control signal effect, control described main pump perform the action matched with described control signal.
Preferably, described second performance element is formed primarily of the second proportioning valve and main valve, the control end of described second proportioning valve connects described signal lag unit, the output of described second proportioning valve connects described main valve, in order to receive described delay control signal, under described delay control signal effect, control described main valve perform the action matched with described delay control signal.
Preferably, the corresponding invariable power of described main pump of described calibration power signal or the invariable power of described motor.
Compared with prior art, the present invention has the following advantages: the control method that the present invention adopts pump control speed governing and valve controlled velocity modulation to combine, such that the flow loss of control system is little, good economy performance, corresponding time is short.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention;
Fig. 2 is the circuit structure block diagram of a kind of detailed description of the invention of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
As shown in Figure 1, a kind of pump valve synchronous control system, be applied to excavator, comprise pilot unit, motor, wherein, comprise collecting unit, be arranged at a predetermined function unit place of excavator, in order to obtain the collection signal at predetermined function unit place, and the signal of telecommunication that formation and collection signal match exports; Collection signal comprises the pressure signal of output of engine rotational speed signal, the first performance element, the flow signal of the output of the second performance element, the pressure signal of pilot unit.
Processing unit, connecting collecting unit, for receiving the signal of telecommunication that collecting unit exports, filtering, amplitude limit, computing being done to the signal of telecommunication, produce the first performance element pressure signal, the first performance element flow signal, the pilot pressure signal that match with control unit input, and export.
Control unit, connection handling unit, for comparing judgement to detection signal, and forms a control signal output;
First performance element, connection control unit, is used to control signal and acts on the work that execution matches with it; First performance element is formed primarily of the first proportioning valve and main pump, the control end of the first proportioning valve connects the output of subtracter, the output of the first proportioning valve connects main pump, in order to reception control signal, controls main pump and perform the action matched with control signal under control signal effect.
Conversion unit, is connected between control unit and one second performance element, is converted into the executive signal that matches with the second performance element and exports for reception control signal, and the second performance element performs corresponding action according to executive signal.Second performance element is formed primarily of the second proportioning valve and main valve, the control end connection control unit of the second proportioning valve, the output of the second proportioning valve connects main valve, and in order to reception control signal, under control signal effect, control bound performs the action matched with delay control signal.
Operating principle of the present invention is: collecting unit obtains the collection signal of predetermined function unit, and the signal of telecommunication that formation and collection signal match exports; Collection signal comprises the pressure signal of engine rotational speed signal, the first performance element, the pressure signal of the second performance element, the pressure signal of pilot unit.Control unit does filtering, amplitude limit, computing to collection signal, draw secondary pilot pressure, main pump pressure, main pump flow control signal, by the instant discharge capacity of secondary pilot pressure determination main pump, draw the flow signal of main pump and the pressure signal deviations amount of main pump according to invariable power PID simultaneously, and then the real time discharge volume control signal of main pump is calculated by a subtracter, the first performance element, the second performance element, conversion unit perform real time discharge volume control signal.The control method that the present invention adopts pump control speed governing and valve controlled velocity modulation to combine, such that the flow loss of control system is little, good economy performance, corresponding time is short.
As further preferred embodiment, as shown in Figure 2, control unit comprises power calculation unit, connection handling unit, for receiving the first performance element pressure signal, the first performance element flow signal, forms a power signal and exports under a predetermined control method; Invariable power PID, connects power calculation unit, calibration power signal respectively, for comparing power signal and standard signal, producing a comparative result and exporting.Invariable power can be the invariable power of main pump, also can be the invariable power of motor, also can be the invariable power that both combine.
The predetermined control method that power calculation unit adopts is:
P=(p
main pump× q
main pump) ÷ 60
Wherein P is main pump power; P main pump is main pump pressure, and q main pump is main pump flow.
As further preferred embodiment, described control unit also comprises a subtracter, the input of described subtracter connects the output of described invariable power PID and the output of described pressure conversion unit respectively, forms the output of described control signal in order to deduct described comparative result according to described flow signal.
As further preferred embodiment, second performance element also can comprise signal lag unit, be connected between control unit and the second performance element, carry out delay process in order to the control signal exported control unit, and form a delay control signal and transfer to the second performance element.Because main valve response speed is higher than main pump response speed, by increasing delay process, making main valve and the speed governing of main pump Synchronization Control, reducing oil consumption.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection domain is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations manual of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (10)
1. a pump valve synchronous control system, is applied to excavator, comprises pilot unit, motor, it is characterized in that, comprise
Collecting unit, is arranged at a predetermined function unit place of described excavator, and in order to obtain the collection signal at described predetermined function unit place, and the signal of telecommunication that formation and described collection signal match exports;
Processing unit, connects described collecting unit, for receiving the signal of telecommunication that described collecting unit exports, and forms processed detection signal output;
Control unit, connects described processing unit, for comparing judgement to described detection signal, and forms a control signal output;
First performance element, connects described control unit, is used to described control signal and acts on the work that execution matches with it;
Conversion unit, be connected between described control unit and one second performance element, be converted into the executive signal that matches with described second performance element for receiving described control signal and export, described second performance element performs corresponding action according to described executive signal.
2. a kind of pump valve synchronous control system according to claim 1, it is characterized in that, described collection signal comprises the pressure signal of output of described engine rotational speed signal, described first performance element, the flow signal of the output of described second performance element, the pressure signal of described pilot unit.
3. a kind of pump valve synchronous control system according to claim 1, it is characterized in that, described processing unit is used for doing filtering, amplitude limit, computing to the described signal of telecommunication, produce the first performance element pressure signal, the first performance element flow signal, the pilot pressure signal that match with described control unit input, and export.
4. a kind of pump valve synchronous control system according to claim 1, it is characterized in that, described control unit comprises
Power calculation unit, connects described processing unit, for receiving described first performance element pressure signal, the first performance element flow signal, forming a power signal and exporting under a predetermined control method;
Invariable power PID, connects described power calculation unit, calibration power signal respectively, for comparing described power signal and described standard signal, producing a comparative result and exporting.
5. a kind of pump valve synchronous control system according to claim 4, it is characterized in that, described control unit also comprises a pressure conversion unit, connects described processing unit, in order to receive described pilot pressure signal, and be converted into the flow signal output matched with it.
6. a kind of pump valve synchronous control system according to claim 5, it is characterized in that, described control unit also comprises a subtracter, the input of described subtracter connects the output of described invariable power PID and the output of described pressure conversion unit respectively, forms the output of described control signal in order to deduct described comparative result according to described flow signal.
7. a kind of pump valve synchronous control system according to claim 1, is characterized in that, described second performance element also comprises signal lag unit,
Be connected between described control unit and described second performance element, carry out delay process in order to the described control signal exported described control unit, and form a delay control signal and transfer to described second performance element.
8. a kind of pump valve synchronous control system according to claim 6, is characterized in that, described first performance element is formed primarily of the first proportioning valve and main pump,
The control end of described first proportioning valve connects the output of described subtracter, the output of described first proportioning valve connects described main pump, in order to receive described control signal, under described control signal effect, control described main pump perform the action matched with described control signal.
9. a kind of pump valve synchronous control system according to claim 7, is characterized in that, described second performance element is formed primarily of the second proportioning valve and main valve,
The control end of described second proportioning valve connects described signal lag unit, the output of described second proportioning valve connects described main valve, in order to receive described delay control signal, under described delay control signal effect, control described main valve perform the action matched with described delay control signal.
10. a kind of pump valve synchronous control system according to claim 4, is characterized in that, the corresponding invariable power of described main pump of described calibration power signal or the invariable power of described motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410592634.0A CN104405003B (en) | 2014-10-28 | 2014-10-28 | Pump and valve synchronous control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410592634.0A CN104405003B (en) | 2014-10-28 | 2014-10-28 | Pump and valve synchronous control system |
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| CN104405003A true CN104405003A (en) | 2015-03-11 |
| CN104405003B CN104405003B (en) | 2017-01-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0572678A1 (en) * | 1991-12-24 | 1993-12-08 | Hitachi Construction Machinery Co., Ltd. | Hydraulic driving apparatus for construction machines |
| CN102011416A (en) * | 2010-11-03 | 2011-04-13 | 三一重机有限公司 | Hydraulic excavator flow rate control method and control loop |
| CN102635137A (en) * | 2011-02-12 | 2012-08-15 | 上海派芬自动控制技术有限公司 | Total power control system of mechanical equipment |
| CN202831052U (en) * | 2012-09-29 | 2013-03-27 | 徐州徐工挖掘机械有限公司 | Hydraulic pressure excavating machine controlling system based on constant power and variable power |
| CN103306329A (en) * | 2013-05-28 | 2013-09-18 | 上海三一重机有限公司 | Control system for micro-controlling hydraulic shear based on excavating machine and method and excavating machine |
-
2014
- 2014-10-28 CN CN201410592634.0A patent/CN104405003B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0572678A1 (en) * | 1991-12-24 | 1993-12-08 | Hitachi Construction Machinery Co., Ltd. | Hydraulic driving apparatus for construction machines |
| CN102011416A (en) * | 2010-11-03 | 2011-04-13 | 三一重机有限公司 | Hydraulic excavator flow rate control method and control loop |
| CN102635137A (en) * | 2011-02-12 | 2012-08-15 | 上海派芬自动控制技术有限公司 | Total power control system of mechanical equipment |
| CN202831052U (en) * | 2012-09-29 | 2013-03-27 | 徐州徐工挖掘机械有限公司 | Hydraulic pressure excavating machine controlling system based on constant power and variable power |
| CN103306329A (en) * | 2013-05-28 | 2013-09-18 | 上海三一重机有限公司 | Control system for micro-controlling hydraulic shear based on excavating machine and method and excavating machine |
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| CN104405003B (en) | 2017-01-25 |
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