CN103899599B - A kind of controlling method of instant flow matches, system and hoist - Google Patents
A kind of controlling method of instant flow matches, system and hoist Download PDFInfo
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- CN103899599B CN103899599B CN201410169396.2A CN201410169396A CN103899599B CN 103899599 B CN103899599 B CN 103899599B CN 201410169396 A CN201410169396 A CN 201410169396A CN 103899599 B CN103899599 B CN 103899599B
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Abstract
The present invention relates to a kind of controlling method of instant flow matches, system and hoist, wherein, the controlling method of instant flow matches comprises the following steps: judge whether to meet imposing a condition of working connection overflow valve by the checkout value of sensor; If imposed a condition described in meeting, then controlled the ratio pump delivery on described working connection by controller; If imposed a condition described in not meeting, then freely can control described ratio pump delivery by Joystick.The present invention maintains the output flow of dosing pump automatically by controller, and finally make the output flow of dosing pump no longer increase, relief valve does not exist spillway discharge, avoids the generation of spill losses, decreases heating value.
Description
Technical field
The present invention relates to engineering machinery field, particularly relate to a kind of controlling method of instant flow matches, system and hoist.
Background technique
The full Terrain Cranes of large-tonnage belongs to high-power machinery, and energy consumption is comparatively large, therefore will consider its fuel economy during design, and avoid unnecessary fuel consumption as far as possible.On Telescopic crane, its principal arm has single oil cylinder, and main arm telescoping can change the length of arm, and flexible power is from telescopic oil cylinder.Due to the needs of application area and operating mode, main arm of crane also has luffing function except having Telescopic, and namely the angle of its principal arm and horizontal plane can change within the specific limits.When telescopic oil cylinder changes with the arm motion of varying number or principal arm angle, the load of telescopic oil cylinder is all in change.
Hoister in large tonnage telescopic hydraulic system passing ratio pump provides oil sources, carry out control ratio pump displacement V(ml/r by the size of electric current) size, electric current more vast scale pump displacement V is larger, according to Q=V × n, n represents the rotating speed (r/min) of motor, thus can control dosing pump output flow Q(ml/min) size.Telescopic oil cylinder motion speed depend on POF number and relief valve spillway discharge number.When telescopic oil cylinder works, when the change angle change of arm is stretched with the different joint arm of drive, the load of telescopic oil cylinder is change, if prolong journey and restriction loss sum in system load, pipeline when reaching the force value of relief valve setting, if now artificial increase ratio pump delivery or open the throttle (raising engine speed), very little to cylinder movement rate, only can increase spill losses, energy consumption and system heating value.Therefore, be necessary to be optimized improvement to control system, avoid unnecessary spill losses, improve fuel economy, reduce heating value.
Summary of the invention
For the problems referred to above, the object of the invention is to propose a kind of controlling method of instant flow matches, system and hoist, it can reduce spillway discharge to greatest extent, saves energy consumption, reduces the heating value of hydraulic oil.
For achieving the above object, the invention provides a kind of controlling method of instant flow matches, comprise the following steps:
Judge whether to meet imposing a condition of working connection overflow valve by the checkout value of sensor;
If imposed a condition described in meeting, then controlled the ratio pump delivery on described working connection by controller;
If imposed a condition described in not meeting, then freely can control described ratio pump delivery by Joystick.
One preferably or in embodiment, if imposed a condition described in meeting, described controller has precedence over described Joystick and goes to control described ratio pump delivery, if now the rotating speed of motor is constant, described controller just controls described ratio pump delivery no longer to be increased; If now the rotating speed of motor increases, described controller just controls the corresponding reduction of described ratio pump delivery.
One preferably or in embodiment, describedly impose a condition as the difference between the outlet pressure of described dosing pump and the setting pressure of described relief valve is less than or equal to 0, and be more than or equal to default threshold value, described sensor setting, in the exit position of described dosing pump, detects the outlet pressure of described dosing pump.
One preferably or in embodiment, describedly impose a condition as there is flow between the main valve plug of described relief valve and pilot valve, described sensor setting, on the oil circuit between the main valve plug and pilot valve of described relief valve, detects the flow between the main valve plug of described relief valve and pilot valve.
One preferably or in embodiment, described in impose a condition as the main valve plug of described relief valve exists displacement amount, described sensor setting, on the main valve plug of described relief valve, detects the displacement amount of the main valve plug of described relief valve.
For achieving the above object, present invention also offers a kind of control system of instant flow matches, comprise and be arranged on sensor in hydraulic system and controller, described sensor electrical connects described controller, and described controller is electrically connected the dosing pump in described hydraulic system; Described sensor is used for checkout value to flow to described controller, and described controller is used for judging whether to meet imposing a condition of working connection overflow valve in described hydraulic system according to the checkout value of described sensor; If imposed a condition described in meeting, then control described ratio pump delivery; If imposed a condition described in not meeting, then freely control described ratio pump delivery by Joystick.
One preferably or in embodiment, described controller also under the state imposed a condition described in meeting, according to the rotating speed of motor, controls described ratio pump delivery, if now the rotating speed of described motor is constant, then controlling described ratio pump delivery no longer increases; If now the rotating speed of described motor increases, then control the corresponding reduction of described ratio pump delivery.
One preferably or in embodiment, described sensor setting is in the exit position of described dosing pump, for detecting the outlet pressure of described dosing pump, describedly to impose a condition as the difference between the outlet pressure of described dosing pump and the setting pressure of described relief valve is less than or equal to 0, and be more than or equal to default threshold value.
One preferably or in embodiment, described sensor setting is on the oil circuit between the main valve plug and pilot valve of described relief valve, for detecting the flow between the main valve plug of described relief valve and pilot valve, described in impose a condition as there is flow between the main valve plug of described relief valve and pilot valve.
One preferably or in embodiment, described sensor setting on the main valve plug of described relief valve, for detecting the displacement amount of the main valve plug of described relief valve, described in impose a condition as the main valve plug of described relief valve exists displacement amount.
For achieving the above object, present invention also offers a kind of hoist, comprise hydraulic system, also comprise the control system of the instant flow matches in above-mentioned any embodiment.
Based on technique scheme, the present invention at least has following beneficial effect:
The present invention judges whether to meet imposing a condition of working connection overflow valve by the checkout value of sensor, impose a condition if met, then control the ratio pump delivery on working connection by controller, its discharge capacity is no longer increased but can be changed to the direction reduced by lever operated its discharge capacity that makes, impose a condition if do not met, then can free control ratio pump delivery by Joystick, the present invention maintains the output flow of dosing pump automatically by controller, the output flow of dosing pump is finally made no longer to increase, there is not spillway discharge in relief valve, if now manual operation wants that the output flow making pump increases, then controller can maintain current output flow by control ratio pump, if manual operation wants that the output flow making pump reduces, dosing pump can make output flow reduce according to the commander of people accordingly, avoid the generation of spill losses, decrease heating value.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, 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 the principle schematic of crane telescopic hydraulic system provided by the invention;
Fig. 2 is the schematic flow sheet of the controlling method of instant flow matches provided by the invention;
Fig. 3 is the principle schematic of the first specific embodiment of the controlling method of the instant flow matches of crane telescopic hydraulic system provided by the invention;
Fig. 4 is the principle schematic of the second specific embodiment of the controlling method of the instant flow matches of crane telescopic hydraulic system provided by the invention;
Fig. 5 is the principle schematic of the 3rd specific embodiment of the controlling method of the instant flow matches of crane telescopic hydraulic system provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on embodiments of the 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.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
On Telescopic crane, telescopic oil cylinder load operationally mainly arm is conducted oneself with dignity along the component in arm direction and the frictional force between arm and arm.Under different change angles, arm deadweight along the component in arm direction and change in friction force very large, thus cause the outer load of telescopic oil cylinder to vary widely scope.In hoister in large tonnage telescopic hydraulic system, oil pump is dosing pump, and the size of its discharge capacity V is regulated with Joystick by operator.The setting pressure of the relief valve on working connection (dosing pump outlet) is steady state value, if now outer load becomes large, the flow Q people of dosing pump is for increasing, can cause that oil cylinder internal pressure becomes large, increasing along stroke pressure loss and restriction loss in pipeline, be easy to cause the pressure of system working connection to reach the setting pressure of relief valve, and produce a large amount of overflows, thus create larger energy loss, heating value increases, the stability of influential system.
As shown in Figure 1, be a specific embodiment of crane telescopic hydraulic system provided by the invention, in this hydraulic system, passing ratio pump 6 provides pressure oil, arranges the maximum pressure that relief valve 1 limits this hydraulic system, and the setting pressure of relief valve 1 is XMPa.In this hydraulic system, the working principle that telescopic oil cylinder 7 stretches is: when solenoid directional control valve Y1 obtains electric, cartridge valve 2 enters telescopic oil cylinder 7 large chamber by equilibrium valve 8 pushed open by pressure oil, and the oil of telescopic oil cylinder 7 loculus is pushed cartridge valve 5 open and flowed back to fuel tank; When solenoid directional control valve Y2 obtains electric, the loculus that cartridge valve 4 enters telescopic oil cylinder 7 pushed open by pressure oil, opens the equilibrium valve 8 of the large side, chamber of telescopic oil cylinder 7 simultaneously, and the oil in the large chamber of telescopic oil cylinder 7 is pushed cartridge valve 3 open and flowed back to fuel tank.
When load become large relief valve 1 there is overflow time, generally that operator makes the discharge capacity V of dosing pump 6 become large by Joystick in prior art, or open the throttle and the rotating speed n of motor is improved, although according to Q=V × n, the output flow Q of dosing pump 6 can be increased, but too increase the spillway discharge of relief valve 1 simultaneously, very little on the movement velocity impact of telescopic oil cylinder 7, cause unnecessary spill losses, reduce fuel economy.
As shown in Figure 2, the controlling method of instant flow matches provided by the invention, has precedence over manual operation, and automatically can maintain the output flow of dosing pump 6, avoid the generation of spill losses, decrease heating value, it comprises the following steps:
Judge whether to meet imposing a condition of working connection overflow valve 1 by the checkout value of sensor 9;
Impose a condition if met, then controlled the discharge capacity of the dosing pump 6 on working connection by controller 10;
Impose a condition if do not met, then can the discharge capacity of free control ratio pump 6 by Joystick.
In above-described embodiment, impose a condition if met, controller 10 just has precedence over the electric current that Joystick removes control ratio pump 6, if now the rotating speed of motor is constant, the discharge capacity of controller 10 just control ratio pump 6 no longer increases; If now the rotating speed of motor increases, the corresponding reduction of discharge capacity of controller 10 just control ratio pump 6; Finally make the output flow of dosing pump 6 no longer increase, there is spillway discharge in relief valve 1, decreases spillway discharge hardly to greatest extent, saves energy consumption, reduce the heating value of hydraulic oil.
Generally, the rotating speed of motor and the rotating speed of dosing pump 6 proportional, under equal conditions open the throttle, the rotating speed of motor increases, and the rotating speed of corresponding dosing pump 6 increases.Without the need to detecting the rotating speed of motor in embodiment provided by the invention, the rotating speed gathering motor is not namely needed to participate in controlling.If be at certain operating mode underflow stream valve 1 edge that will open, the discharge capacity that this Time Controller 10 participates in controlling to make dosing pump 6 is not in increase, make the rotating speed of motor increase if now opened the throttle, a nearly step makes the rotating speed of dosing pump 6 increase, and the output flow of such dosing pump 6 will increase, and system pressure will rise, relief valve 1 will be opened, sensor 9 can detect, the discharge capacity of dosing pump 6 is reduced, till finally making the output flow of dosing pump 6 return to original value.
In above-described embodiment, impose a condition can for the outlet pressure of dosing pump 6 equal or close to and be slightly less than the setting pressure of relief valve 1, sensor 9 is arranged on the exit position of dosing pump 6, the outlet pressure of detection ratio pump 6.
The outlet pressure of dosing pump 6 can less than the setting pressure of relief valve 1 [0 ~ 20] bar, or, difference between the outlet pressure of dosing pump 6 and the setting pressure of relief valve 1 is less than or equal to 0, and is more than or equal to default threshold value, this preset threshold value can between [-20 ~ 0] value.
In above-described embodiment, imposing a condition can for existing flow between the main valve plug 11 of relief valve 1 and pilot valve 12, sensor 9 is arranged on the oil circuit between the main valve plug 11 of relief valve 1 and pilot valve 12, detects the flow between the main valve plug 11 of relief valve 1 and pilot valve 12.
In above-described embodiment, impose a condition and can there is displacement amount for the main valve plug 11 of relief valve 1, sensor 9 is arranged on the main valve plug 11 of relief valve 1, detects the displacement amount of the main valve plug 11 of relief valve 1.
For realizing the controlling method of the instant flow matches in above-mentioned any embodiment, present invention also offers a kind of control system of instant flow matches, this system comprises and is arranged on sensor 9 in hydraulic system and controller 10, sensor 9 is electrically connected controller 10, and controller 10 is electrically connected the dosing pump 6 in hydraulic system; The checkout value of sensor 9 flows to controller 10, and controller 10 judges whether to meet imposing a condition of working connection overflow valve 1 in hydraulic system according to the checkout value of sensor 9; Impose a condition if met, then by the discharge capacity of controller 10 control ratio pump 6; Impose a condition if do not met, then can the discharge capacity of free control ratio pump 6 by Joystick.
In above-described embodiment, meeting under the state imposed a condition, controller 10 can according to system pressure, the discharge capacity of control ratio pump 6.When load is constant, if now the rotating speed of motor is constant, the output flow of system just can be constant, and the discharge capacity of controller 10 just control ratio pump 6 no longer increases; If now the rotating speed of motor increases, the output flow of system just can increase, and the pressure of system can rise, the corresponding reduction of discharge capacity of controller 10 just control ratio pump 6.
In above-described embodiment, sensor 9 can be arranged on the exit position of dosing pump 6, the outlet pressure of detection ratio pump 6, impose a condition can for the outlet pressure of dosing pump 6 equal or close to and be slightly less than the setting pressure of relief valve 1, such as: the outlet pressure of dosing pump 6 can less than the setting pressure of relief valve 1 [0 ~ 20] bar, or, difference between the outlet pressure of dosing pump 6 and the setting pressure of relief valve 1 is less than or equal to 0, and be more than or equal to default threshold value, this preset threshold value can between [-20 ~ 0] value.
In above-described embodiment, sensor 9 can be arranged on the oil circuit between the main valve plug 11 of relief valve 1 and pilot valve 12, detect the flow between the main valve plug 11 of relief valve 1 and pilot valve 12, imposing a condition can for existing flow between the main valve plug 11 of relief valve 1 and pilot valve 12.
In above-described embodiment, sensor 9 can be arranged on the main valve plug 11 of relief valve 1, detects the displacement amount of the main valve plug 11 of relief valve 1, imposes a condition and can there is displacement amount for the main valve plug 11 of relief valve 1.
The relief valve 1 used in the present embodiment comprises main valve plug 11 and pilot valve 12.
Present invention also offers a kind of hoist, it comprises hydraulic system, also comprises the control system of the instant flow matches in above-mentioned any embodiment.
The hydraulic system used in hoist provided by the invention or can be hoisting hydraulic system, Hydraulic slewing system, auxiliary hydraulic system etc. for crane telescopic variable amplitude hydraulic system.
Enumerate the controlling method of instant flow matches provided by the invention below, system is used in three specific embodiments in crane telescopic hydraulic system.
First specific embodiment: as shown in Figure 3, the sensor 9 that crane telescopic hydraulic system is arranged is pressure transducer, pressure transducer is arranged on the working connection between dosing pump 6 and relief valve 1, by the real-time outlet pressure of pressure transducer detection ratio pump 6, pressure transducer electrical connection controller 10, controller 10 is electrically connected dosing pump 6.Detect the real-time outlet pressure with feedback proportional pump 6 in real time by pressure transducer, by the discharge capacity of controller 10 ACTIVE CONTROL dosing pump 6, reduce spillway discharge to greatest extent, save energy consumption, reduce the heating value of hydraulic oil.
The real-time outlet pressure of pressure transducer detection ratio pump 6 in the course of the work:
A is once outlet pressure is close to the setting pressure XMPa of relief valve 1 in real time, and controller 10 just has precedence over the control electric current that Joystick removes to maintain or reduce dosing pump 6, and Joystick control ratio pump 6 electric current can only to the direction change reduced.If the direction operation that now artificial handle increases to control ratio pump 6 electric current or greater engine throttle, just the output flow of dosing pump 6 can be made to increase, make system pressure increase and occur spillway discharge, controller 10 just makes corresponding control, and the output flow of dosing pump 6 is no longer increased.If now engine speed is constant, the discharge capacity of controller 10 just control ratio pump 6 no longer increases, and controls to only have the direction change reduced to discharge capacity with handle; If now engine speed increases, the corresponding reduction of discharge capacity of controller 10 just control ratio pump 6.Be will open but not open in the working state of transition point relief valve 1 controlled, the spillway discharge of the system under maximum load dropped to minimum, reduces the heating value of energy consumption and system.
If the real-time outlet pressure that b detects is less than the setting pressure XMPa of relief valve 1, Joystick just works, can the discharge capacity of free control ratio pump 6.
The control logic of the first specific embodiment is: when solenoid directional control valve Y1 obtains electric, and cartridge valve 2 enters telescopic oil cylinder 7 large chamber by equilibrium valve 8 pushed open by pressure oil, and the oil of telescopic oil cylinder 7 loculus is pushed cartridge valve 5 open and flowed back to fuel tank; When solenoid directional control valve Y2 obtains electric, the loculus that cartridge valve 4 enters telescopic oil cylinder 7 pushed open by pressure oil, opens the equilibrium valve 8 of the large side, chamber of telescopic oil cylinder 7 simultaneously, and the oil in the large chamber of telescopic oil cylinder 7 is pushed cartridge valve 3 open and flowed back to fuel tank.
Second specific embodiment: as shown in Figure 4, the sensor 9 that crane telescopic hydraulic system is arranged is flow transducer, flow transducer is connected on the oil circuit at place between the main valve plug 11 of relief valve 1 and pilot valve 12, detecting the flow between the main valve plug 11 of relief valve 1 and pilot valve 12 in real time by flow transducer, imposing a condition as there is flow between the main valve plug 11 of relief valve 1 and pilot valve 12.
When flow transducer detect there is flow between the main valve plug 11 of relief valve 1 and pilot valve 12 time, characterize the setting pressure of real-time outlet pressure close to relief valve 1, controller 10 just has precedence over the electric current that Joystick removes control ratio pump 6, if now the rotating speed of motor is constant, the discharge capacity of controller 10 just control ratio pump 6 no longer increases; If now the rotating speed of motor increases, the corresponding reduction of discharge capacity of controller 10 just control ratio pump 6; Finally making the output flow of dosing pump 6 no longer increase, there is not spillway discharge in relief valve 1;
When flow transducer does not detect flow between the main valve plug 11 of relief valve 1 and pilot valve 12, characterize the setting pressure that real-time outlet pressure is less than relief valve 1, Joystick just can the discharge capacity of free control ratio pump 6.
The control logic of the second specific embodiment is: when solenoid directional control valve Y1 obtains electric, and cartridge valve 2 enters telescopic oil cylinder 7 large chamber by equilibrium valve 8 pushed open by pressure oil, and the oil of telescopic oil cylinder 7 loculus is pushed cartridge valve 5 open and flowed back to fuel tank; When solenoid directional control valve Y2 obtains electric, the loculus that cartridge valve 4 enters telescopic oil cylinder 7 pushed open by pressure oil, opens the equilibrium valve 8 of the large side, chamber of telescopic oil cylinder 7 simultaneously, and the oil in the large chamber of telescopic oil cylinder 7 is pushed cartridge valve 3 open and flowed back to fuel tank.
3rd specific embodiment: as shown in Figure 5, the sensor 9 that crane telescopic hydraulic system is arranged is displacement transducer, displacement transducer is arranged on the main valve plug 11 of relief valve 1, detected the displacement amount of the main valve plug 11 of relief valve 1 by displacement transducer in real time, impose a condition as the main valve plug 11 of relief valve 1 exists displacement amount.
When displacement transducer detects that the main valve plug 11 of relief valve 1 exists displacement amount, characterize the setting pressure of real-time outlet pressure close to relief valve 1, controller 10 just has precedence over the electric current that Joystick removes control ratio pump 6, if now the rotating speed of motor is constant, the discharge capacity of controller 10 just control ratio pump 6 no longer increases; If now the rotating speed of motor increases, the corresponding reduction of discharge capacity of controller 10 just control ratio pump 6; Finally making the output flow of dosing pump 6 no longer increase, there is not spillway discharge in relief valve 1;
When displacement transducer does not detect main valve plug 11 displacement amount of relief valve 1, characterize the setting pressure that real-time outlet pressure is less than relief valve 1, Joystick can the discharge capacity of free control ratio pump 6.
The control logic of the 3rd specific embodiment is: when solenoid directional control valve Y1 obtains electric, and cartridge valve 2 enters telescopic oil cylinder 7 large chamber by equilibrium valve 8 pushed open by pressure oil, and the oil of telescopic oil cylinder 7 loculus is pushed cartridge valve 5 open and flowed back to fuel tank; When solenoid directional control valve Y2 obtains electric, the loculus that cartridge valve 4 enters telescopic oil cylinder 7 pushed open by pressure oil, opens the equilibrium valve 8 of the large side, chamber of telescopic oil cylinder 7 simultaneously, and the oil in the large chamber of telescopic oil cylinder 7 is pushed cartridge valve 3 open and flowed back to fuel tank.
The concept of instant flow matches is applied in hydraulic system by the present invention, avoids the generation of overflow phenomena, decreases heating value.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request of the present invention protection.
Claims (9)
1. a controlling method for instant flow matches, is characterized in that, it comprises the following steps:
Judge whether to meet imposing a condition of working connection overflow valve by the checkout value of sensor;
If imposed a condition described in meeting, then controlled the ratio pump delivery on described working connection by controller;
If imposed a condition described in not meeting, then freely can control described ratio pump delivery by Joystick;
If imposed a condition described in meeting, described controller has precedence over described Joystick and goes to control described ratio pump delivery, if now the rotating speed of motor is constant, described controller just controls described ratio pump delivery no longer to be increased; If now the rotating speed of motor increases, described controller just controls the corresponding reduction of described ratio pump delivery.
2. the controlling method of instant flow matches according to claim 1, it is characterized in that: described in impose a condition as the difference between the outlet pressure of described dosing pump and the setting pressure of described relief valve is less than or equal to 0, and be more than or equal to default threshold value, described sensor setting, in the exit position of described dosing pump, detects the outlet pressure of described dosing pump.
3. the controlling method of instant flow matches according to claim 1, it is characterized in that: described in impose a condition as there is flow between the main valve plug of described relief valve and pilot valve, described sensor setting, on the oil circuit between the main valve plug and pilot valve of described relief valve, detects the flow between the main valve plug of described relief valve and pilot valve.
4. the controlling method of instant flow matches according to claim 1, it is characterized in that: described in impose a condition as the main valve plug of described relief valve exists displacement amount, described sensor setting, on the main valve plug of described relief valve, detects the displacement amount of the main valve plug of described relief valve.
5. a control system for instant flow matches, is characterized in that: it comprises and is arranged on sensor in hydraulic system and controller, and described sensor electrical connects described controller, and described controller is electrically connected the dosing pump in described hydraulic system; Described sensor is used for checkout value to flow to described controller, and described controller is used for judging whether to meet imposing a condition of working connection overflow valve in described hydraulic system according to the checkout value of described sensor; If imposed a condition described in meeting, then control described ratio pump delivery; If imposed a condition described in not meeting, then freely control described ratio pump delivery by Joystick;
Described controller is also under the state imposed a condition described in meeting, and according to the rotating speed of motor, control described ratio pump delivery, if now the rotating speed of described motor is constant, then controlling described ratio pump delivery no longer increases; If now the rotating speed of described motor increases, then control the corresponding reduction of described ratio pump delivery.
6. the control system of instant flow matches according to claim 5, it is characterized in that: described sensor setting is in the exit position of described dosing pump, for detecting the outlet pressure of described dosing pump, describedly to impose a condition as the difference between the outlet pressure of described dosing pump and the setting pressure of described relief valve is less than or equal to 0, and be more than or equal to default threshold value.
7. the control system of instant flow matches according to claim 5, it is characterized in that: described sensor setting is on the oil circuit between the main valve plug and pilot valve of described relief valve, for detecting the flow between the main valve plug of described relief valve and pilot valve, described in impose a condition as there is flow between the main valve plug of described relief valve and pilot valve.
8. the control system of instant flow matches according to claim 5, it is characterized in that: described sensor setting is on the main valve plug of described relief valve, for detecting the displacement amount of the main valve plug of described relief valve, described in impose a condition as the main valve plug of described relief valve exists displacement amount.
9. a hoist, it comprises hydraulic system, it is characterized in that: it also comprises the control system of the instant flow matches according to any one of claim 5-8.
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| CN110285098A (en) * | 2019-06-25 | 2019-09-27 | 徐州徐工特种工程机械有限公司 | Energy-saving electric machine drive hydraulic system principle and its control method |
| CN113987948B (en) * | 2021-11-03 | 2022-11-04 | 江苏四联水务科技有限公司 | Intelligent measuring and calculating method and system for outlet water flow of pump station |
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