CN102705211B - A kind of variable pump small displacement and little pressure control loop and control method thereof - Google Patents
A kind of variable pump small displacement and little pressure control loop and control method thereof Download PDFInfo
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- CN102705211B CN102705211B CN201210220469.7A CN201210220469A CN102705211B CN 102705211 B CN102705211 B CN 102705211B CN 201210220469 A CN201210220469 A CN 201210220469A CN 102705211 B CN102705211 B CN 102705211B
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Abstract
The invention discloses a kind of variable pump small displacement and little pressure control loop and control method thereof, the automatically controlled end of electromagnetic valve, the automatically controlled end of proportional pressure-reducing valve is connected with controller respectively with engine speed sensor, accumulator is connected with the pioneer pump of one way valve with variable pump control loop through the first electromagnetic valve, accumulator is connected with the discharge capacity drive circuit hydraulic fluid port of variable pump control loop with proportional pressure-reducing valve through the first electromagnetic valve, described accumulator is connected with the displacement control hydraulic fluid port of variable pump control loop with one way valve through the second electromagnetic valve, the 3rd described electromagnetic valve is connected with the oil-out of variable pump control loop with the 4th electromagnetic valve, speed probe detects the rotating speed of the output shaft that motor is connected with variable pump.Present invention achieves the control of minimum injection rate to variable pump and minimum pressure, oil consumption when effectively reducing the starting load of motor and run.
Description
Technical field
The present invention relates to a kind of variable pump control loop, particularly relate to a kind of variable pump small displacement and little pressure control loop, the invention still further relates to the control method of this variable pump small displacement and little pressure control loop.
Background technology
Hydraulic system is relied on to be the motion of equipment by the changes mechanical energy of motor under excavator regular situation, as rising, the decline of working arm, adduction or put outward, the actions such as the revolution of car load.And the conversion of whole Process Energy is realized by hydraulic pump band hydraulic cylinder and hydraulic motor, under normal circumstances, motor needs to bear hydraulic pump to carry out starting or running, the product of hydraulic pressure pump delivery and outlet pressure determines the size of load torque value in engine start or operation, in the application practice of excavator, when the load that hydraulic pump brings to motor increases engine start on the one hand, the electric current of starter and the burden of storage battery, bring the problems such as difficulty in starting simultaneously at low temperatures; On the other hand, this load causes the loss of engine operation energy.Therefore, in order to reduce engine start and operating load, solving engine start and reducing oil consumption problem, proposing the present invention, a kind of variable pump small displacement, little pressure control loop and control method.
Summary of the invention
First technical problem to be solved by this invention be to provide a kind of effectively can reduce motor starting load and run time the variable pump small displacement of oil consumption and little pressure control loop.
Second technical problem to be solved by this invention be to provide a kind of realize effectively reducing motor starting load and run time the variable pump small displacement of oil consumption and the control method of little pressure control loop.
In order to solve above-mentioned first technical problem, variable pump small displacement provided by the invention and little pressure control loop, comprise variable pump control loop and proportional pressure-reducing valve, described variable pump control loop comprises variable pump control loop, variable pump control loop and pioneer pump control loop, the shaft detection that speed probe and motor are connected with variable pump connects, accumulator is connected with the pioneer pump of the first one way valve with described variable pump control loop through the first electromagnetic valve, described accumulator is connected with control loop flow-control mouth with described proportional pressure-reducing valve through the first described electromagnetic valve, described accumulator is through the second electromagnetic valve, second one way valve is connected with the flow-control hydraulic fluid port of the 3rd one way valve with described variable pump control loop, 3rd electromagnetic valve is connected with the oil-out of described variable pump control loop respectively with the 4th electromagnetic valve, the first described electromagnetic valve, second electromagnetic valve, the automatically controlled end of the 3rd electromagnetic valve and the 4th electromagnetic valve, automatically controlled end and the described speed probe of described proportional pressure-reducing valve are electrically connected with controller respectively.
Described first electromagnetic valve, the second electromagnetic valve, the 3rd electromagnetic valve and the 4th electromagnetic valve are switching value electromagnetic valve.
Described variable pump is axial plunger type variable capacity pump.
Described variable delivery side of pump is provided with pressure sensor, and described pressure sensor is connected with described controller.
In order to solve above-mentioned second technical problem, the control method realizing variable pump small displacement and little pressure control loop provided by the invention, comprises the following steps;
Step s1: on the controller after electricity, controller detects the rotating speed of motor, and by the signal of speed probe, the state of controller to motor judges, judges that motor is in and prepares starting state or normal operating condition;
Step s2: when speed probe detection signal is less than 200 revs/min, controller sends a control signal to electromagnetic valve and proportional pressure-reducing valve respectively, makes electromagnetic valve and proportional pressure-reducing valve be in opening;
Step s3: the pressure oil of accumulator is transported to the displacement control loop hydraulic fluid port of variable pump control loop respectively by the second electromagnetic valve, the second one way valve and the 3rd one way valve;
Step s4: the pressure oil of accumulator is transported to the control loop flow-control mouth place of proportional pressure-reducing valve and variable pump control loop respectively by the first electromagnetic valve;
Step s5: the output oil port of variable pump is connected with fuel tank with the 4th electromagnetic valve respectively by the 3rd electromagnetic valve, makes the pressure of variable pump delivery outlet very low like this;
Step s6: after speed probe detection signal is greater than 200 revs/min and time delay a period of time, controller controls variable pump according to the instruction of system and operating condition, makes variable pump be in small displacement and little pressure state at the same time or separately;
Step s7: when motor normally runs, controller realizes pressurising and the holding pressure control of accumulator by the break-make of control first electromagnetic valve.
Described minimum injection rate be discharge capacity close to 0 position.
Described minimum pressure is close to the minimum return pressure 0.2MPa of system.
Adopt the variable pump small displacement of technique scheme and little pressure control loop and control method thereof, the basis of original variable pump systems adopt controller and accumulator, electromagnetic valve, one way valve coordinate running, by controller opens electromagnetic valve, the drive access of conducting accumulator, achieve the small displacement to variable pump and little Stress control, oil consumption when effectively reducing the starting load of motor and run.
In sum, present invention achieves the control of minimum injection rate to variable pump and minimum pressure, oil consumption when effectively reducing the starting load of motor and run.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is control method flow chart of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention will be further described in detail.
Shown in Figure 1, in a specific embodiment of the present invention, this main pump small-displacement starts control method and comprises variable pump control loop 11, controller 13, accumulator 1, the first electromagnetic valve 2, second electromagnetic valve 3, the 3rd electromagnetic valve 4, the 4th electromagnetic valve 5, proportional pressure-reducing valve 6, first one way valve 7, second one way valve 8, the 3rd one way valve 9, speed probe 12, motor 10.Variable pump control loop 11 comprises variable pump control loop 11a, variable pump control loop 11b and arrive first pump control loop, first electromagnetic valve 2, second electromagnetic valve 3, the automatically controlled end of the 3rd electromagnetic valve 4 and the 4th electromagnetic valve 5, automatically controlled end and the speed probe 12 of proportional pressure-reducing valve 6 are electrically connected with controller 13 respectively, accumulator 1 is connected with the pioneer pump of variable pump control loop 11 with the first one way valve 7 through the first electromagnetic valve 2, accumulator 1 is connected with control loop flow-control mouth with proportional pressure-reducing valve 6 through the first electromagnetic valve 2 simultaneously, accumulator 1 is through the second electromagnetic valve 3, second one way valve 8 is connected with the flow-control hydraulic fluid port of variable pump control loop 11 with the 3rd one way valve 9, 3rd electromagnetic valve 4 is connected with the oil-out of variable pump control loop 11 respectively with the 4th electromagnetic valve 5, speed probe 12 detects the rotating speed of the axle that motor 10 is connected with variable pump.First electromagnetic valve 2, second electromagnetic valve 3, the 3rd electromagnetic valve 4 and the 4th electromagnetic valve 5 are switching value electromagnetic valve, and variable pump is axial plunger type variable capacity pump.
Fig. 2 is the control flow chart of this kind of variable pump small displacement, little pressure-activated control method, and it comprises the following steps:
Step s1: after controller 13 powers on, controller 13 detects the rotating speed of motor 10, and by the signal of speed probe 12, the state of controller 13 pairs of motors 10 judges, judges that motor is in and prepares starting state or normal operating condition;
In this step, speed probe 12 is used for detecting the rotating speed of output shaft that motor 10 is connected with variable pump, and before motor 10 starts, the rotating speed of output shaft is 0 rev/min, and normally after startup, minimum speed is more than 500 revs/min;
Step s2: when speed probe 12 detection signal is less than 200 revs/min, controller 13 sends a control signal to the first electromagnetic valve 2, second electromagnetic valve 3, the 3rd electromagnetic valve 4, the 4th electromagnetic valve 5 and proportional pressure-reducing valve 6 respectively, makes the first electromagnetic valve 2, second electromagnetic valve 3, the 3rd electromagnetic valve 4, the 4th electromagnetic valve 5 and proportional pressure-reducing valve 6 be in opening;
Step s3: the pressure oil of accumulator 1 is transported to the flow-control hydraulic fluid port of variable pump control loop 11 respectively by the second electromagnetic valve 3, second one way valve 8 and the 3rd one way valve 9;
Step s4: the pressure oil of accumulator 1 is transported to proportional pressure-reducing valve 6 and variable pump control loop flow-control mouth respectively by the first electromagnetic valve 2, makes variable pump be in minimum injection rate position;
Step s5: the delivery outlet of variable pump is connected with fuel tank with the 4th electromagnetic valve 5 respectively by the 3rd electromagnetic valve 4, makes the pressure of variable pump delivery outlet very low like this;
Through step 4 and step 5, variable pump is in small displacement and little pressure state, because the power of variable pump is very little, thus alleviates the load of motor 10, the startup of motor 10 is become and is more prone to;
Step s6: after speed probe 12 detection signal is greater than 200 revs/min and time delay a period of time, controller 13 stops transmitting control signal to the second electromagnetic valve 3, the 3rd electromagnetic valve 4, the 4th electromagnetic valve 5 and proportional pressure-reducing valve 6;
In this step, controller 13 can control variable pump according to the instruction of system and operating condition, variable pump can be made to be in small displacement and little pressure state at the same time or separately, minimum pressure close to the minimum return pressure 0.2Mpa of system, minimum injection rate be discharge capacity close to 0 position;
Step s7: when motor 10 normally runs, controller 13 realizes pressurising and the holding pressure control of accumulator 1 by the break-make of control first electromagnetic valve 2.
Further, native system is in order to ensure normal operation, and can increase p1 and p2 pressure sensor as shown in Figure 1, p1 with p2 pressure sensor is connected with controller 13, for the running status of detection variable pump, realizes Redundant Control.Electromagnetic valve in above-described embodiment, can replace by adoption rate valve.Even if controller 13 breaks down, the power-off working position of electromagnetic valve also can ensure that original system normally works.The present invention is bivariate pumping system, applicable equally for single argument pumping system.
A kind of variable pump small displacement of the present invention, little pressure control loop and control method, the basis of original variable pump systems adopt controller and accumulator, electromagnetic valve, one way valve coordinate running, by controller opens electromagnetic valve, the drive access of conducting accumulator, achieve the small displacement to variable pump and little Stress control, oil consumption when effectively reducing the starting load of motor and run.
Claims (7)
1. a variable pump small displacement and little pressure control loop, comprise variable pump control loop (11) and proportional pressure-reducing valve (6), described variable pump control loop (11) comprises the first variable pump control loop (11a), second variable pump control loop (11b) and pioneer pump control loop, it is characterized in that: the shaft detection that speed probe (12) is connected with variable pump with motor (10) connects, accumulator (1) is connected with the pioneer pump of the first one way valve (7) with described variable pump control loop (11) through the first electromagnetic valve (2), described accumulator (1) is connected with control loop flow-control mouth with described proportional pressure-reducing valve (6) through described the first electromagnetic valve (2), described accumulator (1) is through the second electromagnetic valve (3), second one way valve (8) is connected with the flow-control hydraulic fluid port of the 3rd one way valve (9) with described variable pump control loop (11), 3rd electromagnetic valve (4) is connected with the oil-out of described variable pump control loop (11) respectively with the 4th electromagnetic valve (5), described the first electromagnetic valve (2), second electromagnetic valve (3), the automatically controlled end of the 3rd electromagnetic valve (4) and the 4th electromagnetic valve (5), automatically controlled end and the described speed probe (12) of described proportional pressure-reducing valve (6) are electrically connected with controller (13) respectively.
2. variable pump small displacement according to claim 1 and little pressure control loop, is characterized in that: described the first electromagnetic valve (2), the second electromagnetic valve (3), the 3rd electromagnetic valve (4) and the 4th electromagnetic valve (5) are switching value electromagnetic valve.
3. variable pump small displacement according to claim 1 and 2 and little pressure control loop, is characterized in that: described variable pump is axial plunger type variable capacity pump.
4. variable pump small displacement according to claim 1 and 2 and little pressure control loop, is characterized in that: described variable delivery side of pump is provided with pressure sensor, and described pressure sensor is connected with described controller (13).
5. realize the control method of variable pump small displacement according to claim 1 and little pressure control loop, it is characterized in that: comprise the following steps;
Step s1: on the controller after electricity, controller detects the rotating speed of motor, and by the signal of speed probe, the state of controller to motor judges, judges that motor is in and prepares starting state or normal operating condition;
Step s2: when speed probe detection signal is less than 200 revs/min, controller sends a control signal to electromagnetic valve and proportional pressure-reducing valve respectively, makes electromagnetic valve and proportional pressure-reducing valve be in opening;
Step s3: the pressure oil of accumulator is transported to the displacement control loop hydraulic fluid port of variable pump control loop respectively by the second electromagnetic valve, the second one way valve and the 3rd one way valve;
Step s4: the pressure oil of accumulator is transported to the control loop flow-control mouth place of proportional pressure-reducing valve and variable pump control loop respectively by the first electromagnetic valve;
Step s5: the output oil port of variable pump is connected with fuel tank with the 4th electromagnetic valve respectively by the 3rd electromagnetic valve, makes the pressure of variable pump delivery outlet very low like this;
Step s6: after speed probe detection signal is greater than 200 revs/min and time delay a period of time, controller controls variable pump according to the instruction of system and operating condition, makes variable pump be in small displacement and little pressure state at the same time or separately;
Step s7: when motor normally runs, controller realizes pressurising and the holding pressure control of accumulator by the break-make of control first electromagnetic valve.
6. the control method realizing variable pump small displacement and little pressure control loop according to claim 5, is characterized in that: described small displacement be discharge capacity close to 0 position.
7. the control method realizing variable pump small displacement and little pressure control loop according to claim 5 or 6, is characterized in that: described little pressure is close to the minimum return pressure 0.2MPa of system.
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| CN201210220469.7A CN102705211B (en) | 2012-06-29 | 2012-06-29 | A kind of variable pump small displacement and little pressure control loop and control method thereof |
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| CN201210220469.7A CN102705211B (en) | 2012-06-29 | 2012-06-29 | A kind of variable pump small displacement and little pressure control loop and control method thereof |
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| CN102705211B true CN102705211B (en) | 2015-12-23 |
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| CN104480991B (en) * | 2014-12-16 | 2016-09-07 | 山河智能装备股份有限公司 | A kind of hydraulic pump of excavator controls loop and control method thereof |
| CN107161898B (en) * | 2017-07-06 | 2018-11-06 | 杭州流控机器制造有限公司 | A kind of hydraulic control system and its method of tension windlass |
| CN110219845B (en) * | 2019-06-24 | 2024-12-24 | 江西鑫通机械制造有限公司 | A hydraulic system with total power control |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101748767A (en) * | 2009-12-17 | 2010-06-23 | 三一重机有限公司 | Excavating machine starting control method and device thereof |
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| GB2394318B (en) * | 1999-10-19 | 2004-06-09 | Sumitomo | Control unit for construction machine |
| JP2010121726A (en) * | 2008-11-20 | 2010-06-03 | Caterpillar Japan Ltd | Hydraulic control system in work machine |
| JP5380240B2 (en) * | 2009-10-13 | 2014-01-08 | 日立建機株式会社 | Hydraulic drive device for work machine |
| KR20120026199A (en) * | 2010-09-09 | 2012-03-19 | 볼보 컨스트럭션 이큅먼트 에이비 | Hydraulic pump control system for construction machine |
| CN102221021B (en) * | 2011-06-23 | 2013-06-12 | 三一重机有限公司 | Main pump small-displacement start control loop and control method |
| CN102304934B (en) * | 2011-06-27 | 2015-07-15 | 浙江苏强格液压股份有限公司 | Hydraulic system of excavator |
| CN202718847U (en) * | 2012-06-29 | 2013-02-06 | 山河智能装备股份有限公司 | Small-displacement and small-pressure control loop for variable pump |
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| CN101748767A (en) * | 2009-12-17 | 2010-06-23 | 三一重机有限公司 | Excavating machine starting control method and device thereof |
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