CN102913332A - Hydraulic system, power distribution method and power distribution device thereof - Google Patents
Hydraulic system, power distribution method and power distribution device thereof Download PDFInfo
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Abstract
The invention provides a hydraulic system, a power distribution method and a power distribution device thereof. The power distribution method of the hydraulic system comprises the steps of obtaining a target rotating speed and an actual rotating speed of an engine; carrying out rotation speed sensitive control on the engine according to the deviation between the target rotation speed and the actual rotation speed so as to control the rotation speed of the engine to be stabilized at the target rotation speed; and distributing the target output power corresponding to the target rotating speed to the variable pumps according to a preset distribution scheme. By applying the technical scheme of the invention, the hydraulic system ensures that the engine works at the optimal working point through the rotating speed sensitive control according to the working environment of the engine, avoids the occurrence of the phenomenon of 'holding back the car', distributes the optimal output power of the engine to the variable displacement pump according to the preset distribution scheme, and has the optimal working efficiency and low oil consumption characteristic under the condition of ensuring the normal work of the hydraulic system.
Description
Technical field
The present invention relates to engineering machinery field, in particular to a kind of hydraulic system and power distribution method and power distribution unit.
Background technique
In hydraulic system, motor is main power source, and power distribution unit is distributed to each hydraulic pressure installation with the output power of motor, by hydraulic pressure installation drive actions actuator.For the engineering machinery such as large hydraulic excavator of the many valves of many pumps, it is a plurality of hydraulic system supply powers such as rotary system, cooling system, pilot system simultaneously that motor needs.And the power of hydraulic system equals the pressure of this hydraulic system and the flow product of this system liquid force feed, and the pressure of hydraulic system is to be determined by load, and hydraulic oil is supplied with by oil hydraulic pump, and its flow equals the product of hydraulic pressure pump delivery and rotating speed.Motor drives each oil hydraulic pump by gearbox and rotates, and such as main pump, rotary pump, coolant pump, pioneer pump etc., realizes the transmission of power.
When engineer machinery operation, when the power sum of all hydraulic pump reached motor theoretical maximum output power, flame-out phenomenon easily occured in motor, and the motor that namely is commonly called as is suppressed car.Suppressing car has affected the normal operation of motor, when serious even can produce motor and damage.Therefore the power division problem of engine power is a difficult point for large-scale engineering machinery always.
May surpass maximum power output for all hydraulic pump power sum in the prior art and cause motor to suppress the problem of car, not yet propose effective solution.
Summary of the invention
The present invention aims to provide a kind of hydraulic system and power distribution method and power distribution unit, and all hydraulic pump power sum may cause motor to suppress the problem of car above maximum power output in the prior art to solve.
To achieve these goals, according to an aspect of the present invention, provide a kind of power distribution method of hydraulic system.
The power distribution method of hydraulic system provided by the invention, hydraulic system wherein comprise that this power distribution method comprises by engine-driven a plurality of variable displacement pumps: rotating speed of target and the actual speed of obtaining motor; According to the deviation of rotating speed of target and actual speed motor is carried out the responsive control of rotating speed, with the control engine stabilization of speed at rotating speed of target; According to default allocative decision the target output corresponding with rotating speed of target distributed to a plurality of variable displacement pumps.
Further, distributing to a plurality of variable displacement pumps according to the default allocative decision target output that rotating speed of target is corresponding comprises: be preferential pump and non-preferential pump with a plurality of variable displacement pumps according to the actuator's classification of type that drives; The output power of motor is distributed to preferential pump according to the demand power of preferential pump; Remaining engine output is distributed to non-preferential pump after will distributing to preferential pump.
Further, the output power of motor being distributed to preferential pump according to the demand power of preferential pump comprises: the induced pressure and the flow that obtain respectively each preferential pump; Calculate respectively the demand power of each preferential pump according to induced pressure and flow, this demand power equals the product of induced pressure and flow; According to the demand power of each preferential pump respectively to each preferential pump power output.
Further, the demand power according to each preferential pump comprises to each preferential pump power output respectively: calculate respectively the Proportional valve electric current corresponding with the demand power of each preferential pump; Respectively to each preferential pump export ratio valve electric current.
Further, will distribute to behind the preferential pump remaining engine output distributes to non-preferential pump and comprises: calculation engine remaining power behind all preferential pump power outputs; Determine the power division ratio of each non-preferential pump according to the operating mode of hydraulic system; Give each non-preferential pump according to the power division ratio with remaining power division.
Further, determine that according to the operating mode of hydraulic system the power division ratio of each non-preferential pump also comprises before: the state that obtains the control mechanism of hydraulic system; Determine the operating mode of hydraulic system according to the state of control mechanism.
Further, comprise to each non-preferential pump remaining power division according to the power division ratio: according to the distribution power of power division ratio and remaining each non-preferential pump of power calculation; Calculate respectively the Proportional valve electric current corresponding with the distribution power of each non-preferential pump; Respectively to each non-preferential pump export ratio valve electric current.
A kind of power distribution unit of hydraulic system is provided according to another aspect of the present invention.The power distribution unit of this hydraulic system comprises: the engine parameter acquisition module, for rotating speed of target and the actual speed of obtaining motor; The control of engine speed module is used for according to the deviation of rotating speed of target and actual speed motor being carried out the responsive control of rotating speed, with the control engine stabilization of speed at rotating speed of target; Variable displacement pump power division module is used for according to default allocative decision the target output corresponding with rotating speed of target being distributed to a plurality of variable displacement pumps.
Further, variable displacement pump power division module comprises: priority is determined submodule, and being used for a plurality of variable displacement pumps is preferential pump and non-preferential pump according to the actuator's classification of type that drives; Preferential pump power distribution sub module is used for the output power of motor is distributed to preferential pump according to the demand power of preferential pump; Non-preferential pump power distribution sub module, remaining engine output is distributed to non-preferential pump after being used for distributing to preferential pump.
Further, the power distribution unit of this hydraulic system also comprises the power current conversion module, is used for calculating respectively the Proportional valve electric current corresponding with the demand power of each variable displacement pump, and exports corresponding Proportional valve electric current to each variable displacement pump.
According to another aspect of the present invention, provide a kind of hydraulic system.This hydraulic system comprises motor, a plurality of variable displacement pump and multi-shaft transmission case, wherein, a plurality of variable displacement pumps are by engine-driving, multi-shaft transmission case is used for respectively connecting engine and a plurality of variable displacement pump, further, also comprise: power distribution unit, this power distribution unit are above-mentioned any power distribution unit.
Further, each variable displacement pump comprises pressure transducer and flow transducer, and power distribution unit and pressure transducer and flow transducer are connected respectively, also are used for obtaining pressure and the flow of variable displacement pump, and according to the demand power of pressure and flow rate calculation variable displacement pump.
Use technological scheme of the present invention, hydraulic system is according to the working environment of motor, by the responsive control of rotating speed, guarantee that motor is working under the optimal working point, avoid the generation of " suppressing car " phenomenon, the motor optimum output power is distributed to variable displacement pump according to default allocative decision, in the situation that guarantee the hydraulic system normal operation, can have optimum working efficiency and low oil consumption characteristic.Characteristic according to motor is distributed power, has solved all hydraulic pump power sum and has caused motor to suppress the problem of car above maximum power output.
Description of drawings
The Figure of description that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the hydraulic system of the embodiment of the invention;
Fig. 2 is the schematic diagram according to the power distribution unit of the hydraulic system of the embodiment of the invention;
Fig. 3 is the schematic diagram according to the variable displacement pump power division module of the power distribution unit of the hydraulic system of the embodiment of the invention;
Fig. 4 is the schematic diagram according to the power distribution method of the hydraulic system of the embodiment of the invention;
Fig. 5 is the control flow schematic diagram of the power distribution method of hydraulic system of the present invention.
Embodiment
Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
The embodiment of the invention provides a kind of hydraulic system, Fig. 1 is the schematic diagram according to the hydraulic system of the embodiment of the invention, as shown in Figure 1, this hydraulic system comprises motor 11, a plurality of variable displacement pump and multi-shaft transmission case 12, wherein, a plurality of variable displacement pumps are driven by motor 11, multi-shaft transmission case 12 is used for respectively connecting engine 11 and a plurality of variable displacement pump, except with the upper-part, the hydraulic system of the embodiment of the invention has also been set up: the responsive control gear 14 of engine speed, for rotating speed of target and the actual speed of obtaining motor 11; Deviation according to rotating speed of target and actual speed is carried out the responsive control of rotating speed to motor 11; Power distribution unit 15 is distributed to a plurality of variable displacement pumps according to default allocative decision control multi-shaft transmission case 12 with the target output corresponding with motor 11 rotating speed of target.
Motor 11 moves under the working state of its best operating point, and motor 11 is in optimum performance, power transfer most effective, and also motor 11 operations are the most stable, are conducive to improve operating life and the functional reliability of motor 11.At the hydraulic system of the embodiments of the invention working environment according to motor 11, by the responsive control of rotating speed, guarantee that motor 11 is working under the optimal working point, avoid the generation of " suppressing car " phenomenon, motor 11 optimum output power are distributed to variable displacement pump according to default allocative decision, in the situation that guarantee the hydraulic system normal operation, can have optimum working efficiency and low oil consumption characteristic.Characteristic according to motor 11 is distributed power, has solved all hydraulic pump power sum and has caused motor 11 to suppress the problem of car above motor 11 maximum outputs.
The responsive control gear 14 of above-mentioned engine speed and power distribution unit 15 can arrange respectively, also can be integrated in the same controller, for example are integrated in the master control programmable logic controller (PLC) (PLC) of engineering machinery.
Wherein, each variable displacement pump is provided with pressure transducer and flow transducer, is respectively applied to pressure p and the flow Q of measurand pump, wherein, the pressure p of variable displacement pump determines flow Q=q*n by the pressure of load, q is this variable pump delivery in formula, and n is the real-time rotate speed of this pump.The pressure transducer of power distribution unit 15 and each variable displacement pump and flow transducer are connected respectively, are used for obtaining force value and the flow value of variable displacement pump, and calculate the demand power V of variable displacement pump according to this force value and flow value, and formula is V=p*Q.
The responsive control gear 14 of power distribution unit 15 in the hydraulic system of the present embodiment and engine speed is as the part of hydraulic system, and the below is elaborated to the power distribution unit of hydraulic system provided by the invention.
Fig. 2 is the schematic diagram according to the power distribution unit of the hydraulic system of the embodiment of the invention, as shown in Figure 2, the power distribution unit of the hydraulic system of this embodiment of the invention comprises: engine parameter acquisition module 21, for rotating speed of target and the actual speed of obtaining motor; Control of engine speed module 23 is used for according to the deviation of rotating speed of target and actual speed motor being carried out the responsive control of rotating speed, with the control engine stabilization of speed at rotating speed of target; Variable displacement pump power division module 25 is used for according to default allocative decision the target output corresponding with the engine target rotating speed being distributed to a plurality of variable displacement pumps.
The power distribution unit of above-mentioned hydraulic system utilizes engine parameter acquisition module 21 and control of engine speed module 23, determine the rotating speed of target of motor according to the performance characteristic (oil consumption, power, speed governing rate etc.) of motor, utilize the responsive control of rotating speed to carry out the responsive control of rotating speed (ESS according to the actual measurement rotating speed of motor and the deviation of rotating speed of target, Engine Speed Sensing) guarantees that the motor smooth running at best operating point, operates under the rotating speed of target state motor.Then utilize target input Power Distribution that variable displacement pump power division module 25 will be corresponding with the engine target rotating speed to each variable displacement pump, thereby the power of motor does not cause the phenomenon of " suppressing car " because of the sudden change of load, and has satisfied the power demand of different variable displacement pumps.
Fig. 3 is the schematic diagram according to the variable displacement pump power division module of the power distribution unit of the hydraulic system of the embodiment of the invention, variable displacement pump power division module 25 specifically can comprise: priority is determined submodule 251, and being used for a plurality of variable displacement pumps is preferential pump and non-preferential pump according to the actuator's classification of type that drives; Preferential pump power distribution sub module 253 is used for the output power of motor is distributed to preferential pump according to the demand power of preferential pump; Non-preferential pump power distribution sub module 255, remaining engine output is distributed to non-preferential pump after being used for distributing to preferential pump.
Usually, independent rotary pump, coolant pump, pioneer pump etc. can be defined as preferential pump for the change displacement hydraulic pump that guarantees the excavator normal operation; And main pump, walking pump etc. provide the change displacement hydraulic pump of power can be defined as non-preferential pump for equipment or some power unit.If preferential pump power demand is not satisfied the damage that may cause excavator or is forced to and stops, if but not preferential pump power demand is not satisfied the reduction that may cause overall performance, but can not cause the unrepairable damage to car load.Therefore the present embodiment utilizes priority to determine that submodule 251 determines its priority according to the job specification of variable displacement pump.At first satisfied the power demand of all preferential pumps by preferential pump power distribution sub module 253, then distributed between non-preferential pump by 255 pairs of remaining power of non-preferential pump power distribution sub module.
Wherein, the specific works flow process of preferential pump power distribution sub module 253 can be: the induced pressure and the flow that obtain respectively each preferential pump; Calculate respectively the demand power of each preferential pump according to induced pressure and flow; According to the demand power of each preferential pump respectively to each preferential pump power output.Namely calculate in real time the realtime power of preferential pump, and then accumulation calculating goes out the total output of all preferential pumps.Engine power is at first distributed according to the power requirements of preferential pump.Step to each preferential pump power output is specially the respectively calculating Proportional valve electric current corresponding with the demand power of each preferential pump; Respectively to each preferential pump export ratio valve electric current.
The specific works flow process of non-preferential pump power distribution sub module 255 can be: calculation engine remaining power behind all preferential pump power outputs; Determine the power division ratio of each non-preferential pump according to the operating mode of hydraulic system; Give each non-preferential pump according to the power division ratio with remaining power division.The power division mode of non-preferential pump is more flexible, wherein the scheme than simple possible is: judge the working state of present hydraulic system according to the handle signal of this variable displacement pump, then determine the power division percentage vector of each non-preferential pump according to design of Hydraulic System.And then draw the power that each non-preferential pump should be got.Namely obtain the state of the control mechanism of hydraulic system; According to the operating mode of the true hydraulic system of state of control mechanism, determine that then each non-preferential pump is to the allocation proportion of surplus power.
Giving the step of each non-preferential pump according to the power division ratio with remaining power division is to comprise: according to the distribution power of power division ratio and remaining each non-preferential pump of power calculation; Calculate respectively each Proportional valve electric current corresponding with the distribution power of non-preferential pump; Respectively to each non-preferential pump export ratio valve electric current.The Proportional valve electric current has directly been controlled the flow value of variable displacement pump, thereby makes power corresponding to the uninterrupted of variable displacement pump consistent with the demand power that calculates in advance.
Control through preferential pump power distribution sub module 253 and non-preferential pump power distribution sub module 255, load according to preferential pump has distributed necessary output power, then with remaining power each non-preferential pump of relation allocation proportionally, the power of all variable displacement pumps conforms to the output power of motor at best operating point.Guaranteed the working efficiency of whole system.
The power distribution unit of the hydraulic system of the embodiment of the invention can also comprise the power current conversion module.Above is that the control electric current can be carried out by the power current conversion module with power transfer.This power current conversion module is used for calculating the demand power of each variable displacement pump, calculates respectively the Proportional valve electric current corresponding with the demand power of each variable displacement pump, and exports corresponding Proportional valve electric current to each variable displacement pump respectively.Namely the power current conversion module is according to the power gearshift function that becomes displacement hydraulic pump, the pump power of target is converted to the Proportional valve electric current exports.
The embodiment of the invention also provides a kind of power distribution method of hydraulic system, the power distribution unit of any hydraulic system that the power distribution method of this hydraulic system can provide by the above embodiment of the present invention is carried out, and, the power distribution method of this hydraulic system can be applied to comprise the hydraulic system with upper controller, Fig. 4 is the schematic diagram according to the power distribution method of the hydraulic system of the embodiment of the invention, and the power distribution method of this hydraulic system comprises:
Step S41 obtains rotating speed of target and the actual speed of motor;
Step S43 carries out the responsive control of rotating speed according to the deviation of rotating speed of target and actual speed to motor, with the control engine stabilization of speed at rotating speed of target;
Step S45 distributes to a plurality of variable displacement pumps according to default allocative decision with the target output corresponding with the engine target rotating speed.
Wherein, step S45 specifically can comprise:
Step S451 is preferential pump and non-preferential pump with a plurality of variable displacement pumps according to the actuator's classification of type that drives;
Step S453 distributes to preferential pump with the output power of motor according to the demand power of preferential pump;
Step S455, will distribute to preferential pump after remaining engine output distribute to non-preferential pump.
The preferential pump power of the distribution of step S453 specifically can comprise: the induced pressure and the flow that obtain respectively each preferential pump; Calculate respectively the demand power of each preferential pump according to induced pressure and flow; According to the demand power of each preferential pump respectively to each preferential pump power output.Wherein, the demand power according to each preferential pump can comprise to each preferential pump power output respectively: calculate respectively the Proportional valve electric current corresponding with the demand power of each preferential pump; Respectively to each preferential pump export ratio valve electric current;
The non-preferential pump power of the distribution of step S455 specifically can comprise: calculation engine remaining power behind all preferential pump power outputs; Determine the power division ratio of each non-preferential pump according to the operating mode of hydraulic system; Give each non-preferential pump according to the power division ratio with remaining power division.Wherein, determine that according to the operating mode of hydraulic system the power division ratio of each non-preferential pump also comprises before: the state that obtains the control mechanism of hydraulic system; Determine the operating mode of hydraulic system according to the state of control mechanism.Can comprise to each non-preferential pump remaining power division according to the power division ratio: according to the distribution power of power division ratio and remaining each non-preferential pump of power calculation; Calculate respectively the Proportional valve electric current corresponding with the distribution power of each non-preferential pump; Respectively to each non-preferential pump export ratio valve electric current.
Below respectively the mode of priority of the power distribution method of the hydraulic system of the embodiment of the invention is described, Fig. 5 is the control flow schematic diagram of the power distribution method of hydraulic system of the present invention, as shown in Figure 5, at first, according to the performance characteristic (oil consumption, power, speed governing rate etc.) of motor, provide the rotating speed of target of motor.Utilize the ESS control module, carry out the responsive control of rotating speed according to the actual measurement rotating speed of motor and the deviation of rotating speed of target, under target/optimal working point, protect simultaneously motor to avoid " suppressing car " to guarantee engine operation.Because the operation of motor all meets its speed power curve, so motor is under target/optimal working point, and the output power of motor keeps target power.Thereby ESS control provides the current target working power of motor.
On the other hand, by the hydraulic system self-characteristic, determine preferential pump and non-preferential pump.Usually, independent rotary pump, coolant pump, pioneer pump etc. can be defined as preferential pump for the change displacement hydraulic pump that guarantees the excavator normal operation; And main pump, walking pump etc. provide the change displacement hydraulic pump of power can be defined as non-preferential pump for equipment or some power unit.If preferential pump power demand is not satisfied the damage that may cause excavator or is forced to and stops, if but not preferential pump power demand is not satisfied the reduction that may cause overall performance, but can not cause the unrepairable damage to car load.
Main purpose of the present invention is to stablize the operation point of motor in the target operation point, guarantees the energy-conservation work of engine high-efficiency.On the other hand, satisfy the power demand of all preferential pumps, last, be that non-preferential pump carries out power division according to the target power of motor and the power demand of preferential pump.Thereby guarantee system in the situation that normal operation can have optimum working efficiency and low oil consumption characteristic.
Preferential pump power calculates, according to real-time induced pressure and the flow/discharge capacity of each preferential pump, according to formula V=p*Q(wherein V be the power of certain pump, p is its induced pressure, and Q=q*n is its flow, and q is this pump delivery, n is the real-time rotate speed of this pump), calculate their realtime power.And then calculate the total output of all preferential pumps.
Non-preferential pump power distributes, and mainly non-preferential pump is carried out power division.Its power division mode is a lot, and wherein the scheme than simple possible is: judge the working state of present excavator according to the handle signal, then determine the power division percentage vector of each non-preferential pump according to design of Hydraulic System.And then draw the power that each non-preferential pump should be got.
The power current conversion module is according to the power gearshift function that becomes displacement hydraulic pump, the pump power of target is converted to the Proportional valve electric current exports.
Utilize the mode of priority of this power distribution method to carry out power division, preferentially guarantee the power demand of preferential pump, to guarantee the normal operation of complete machine.Based on preferential pump realtime power calculating non-preferential pump is carried out power division, can utilize to greatest extent engine power, thereby guarantee working efficiency.Owing to introducing the power division module of non-preferential pump, so that system can carry out the real-time intelligent power division to non-preferential pump according to concrete operating mode, having guaranteed the optimum of power division.Insert the ESS module, guaranteed in the excavator work, motor works in all the time wishes near the operation point, reaches the fuel-economizing purpose, and the ESS module is when avoiding excessive in load moment, and motor falls speed and too much causes " suppressing car ", has reached the purpose of protection motor.
Use technological scheme of the present invention, hydraulic system is according to the working environment of motor, by the responsive control of rotating speed, guarantee that motor is working under the optimal working point, avoid the generation of " suppressing car " phenomenon, the motor optimum output power is distributed to variable displacement pump according to default allocative decision, in the situation that guarantee the hydraulic system normal operation, can have optimum working efficiency and low oil consumption characteristic.Characteristic according to motor is distributed power, has solved all hydraulic pump power sum and has caused motor to suppress the problem of car above maximum power output.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general computing device, they can concentrate on the single computing device, perhaps be distributed on the network that a plurality of computing devices form, alternatively, they can be realized with the executable program-code of computing device, thereby, they can be stored in the storage device and be carried out by computing device, perhaps they are made into respectively each integrated circuit module, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the power distribution method of a hydraulic system, described hydraulic system comprise by engine-driven a plurality of variable displacement pumps, and it is characterized in that, the power distribution method of described hydraulic system comprises:
Obtain rotating speed of target and the actual speed of described motor;
Deviation according to described rotating speed of target and described actual speed is carried out the responsive control of rotating speed to described motor, is stabilized in described rotating speed of target to control described engine speed;
According to default allocative decision the target output corresponding with described rotating speed of target distributed to described a plurality of variable displacement pump.
2. power distribution method according to claim 1 is characterized in that, will the target output corresponding with described rotating speed of target distributes to described a plurality of variable displacement pump according to default allocative decision and comprises:
Be preferential pump and non-preferential pump with described a plurality of variable displacement pumps according to the actuator's classification of type that drives;
The output power of described motor is distributed to described preferential pump according to the demand power of described preferential pump;
Remaining engine output is distributed to described non-preferential pump after will distributing to described preferential pump.
3. power distribution method according to claim 2 is characterized in that, the output power of described motor is distributed to described preferential pump according to the demand power of described preferential pump comprise:
Obtain respectively induced pressure and the flow of each described preferential pump;
Calculate respectively the demand power of each described preferential pump according to described induced pressure and flow, described demand power equals the product of described induced pressure and described flow;
According to the demand power of described each preferential pump respectively to described each preferential pump power output.
4. power distribution method according to claim 3 is characterized in that, comprises to described each preferential pump power output respectively according to the demand power of described each preferential pump:
Calculate respectively the Proportional valve electric current corresponding with the demand power of each described preferential pump;
Export described Proportional valve electric current to described each preferential pump respectively.
5. power distribution method according to claim 2 is characterized in that, will distribute to behind the described preferential pump remaining engine output and distribute to described non-preferential pump and comprise:
Calculate described motor remaining power behind all preferential pump power outputs;
Determine the power division ratio of each described non-preferential pump according to the operating mode of described hydraulic system;
Give each described non-preferential pump according to described power division ratio with described remaining power division.
6. power distribution method according to claim 5 is characterized in that, determines that according to the operating mode of described hydraulic system the power division ratio of each described non-preferential pump also comprises before:
Obtain the state of the control mechanism of described hydraulic system;
Determine the operating mode of described hydraulic system according to the state of described control mechanism.
7. power distribution method according to claim 6 is characterized in that, comprises to each described non-preferential pump described remaining power division according to described power division ratio:
Distribution power according to described power division ratio and described remaining each described non-preferential pump of power calculation;
Calculate respectively the described Proportional valve electric current corresponding with the distribution power of each described non-preferential pump;
Export described Proportional valve electric current to each described non-preferential pump respectively.
8. the power distribution unit of a hydraulic system is characterized in that, comprising:
The engine parameter acquisition module is for rotating speed of target and the actual speed of obtaining described motor;
The control of engine speed module is used for according to the deviation of described rotating speed of target and described actual speed described motor being carried out the responsive control of rotating speed, is stabilized in described rotating speed of target to control described engine speed;
Variable displacement pump power division module is used for according to default allocative decision the target output corresponding with described rotating speed of target being distributed to described a plurality of variable displacement pump.
9. power distribution unit according to claim 8 is characterized in that, described variable displacement pump power division module comprises:
Priority is determined submodule, and being used for described a plurality of variable displacement pumps is preferential pump and non-preferential pump according to the actuator's classification of type that drives;
Preferential pump power distribution sub module is used for the output power of described motor is distributed to described preferential pump according to the demand power of described preferential pump;
Non-preferential pump power distribution sub module, remaining engine output is distributed to described non-preferential pump after being used for distributing to described preferential pump.
10. power distribution unit according to claim 9, it is characterized in that, also comprise the power current conversion module, be used for calculating respectively the Proportional valve electric current corresponding with the demand power of each described variable displacement pump, and export corresponding described Proportional valve electric current to described each variable displacement pump.
11. a hydraulic system comprises motor, a plurality of variable displacement pump and multi-shaft transmission case, wherein, described a plurality of variable displacement pumps are by described engine-driving, and described multi-shaft transmission case is used for connecting described motor and described a plurality of variable displacement pump respectively, it is characterized in that, also comprises:
Power distribution unit, this power distribution unit are the power distribution unit of any one in the claim 8 to 10.
12. hydraulic system according to claim 11, it is characterized in that, each described variable displacement pump comprises pressure transducer and flow transducer, described power distribution unit and described pressure transducer be connected flow transducer and be connected respectively, also be used for obtaining pressure and the flow of described variable displacement pump, and according to the demand power of described pressure and the described variable displacement pump of flow rate calculation.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557151A (en) * | 2013-11-15 | 2014-02-05 | 中联重科股份有限公司 | Displacement control method and device of multi-variable pump and concrete pumping equipment |
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| CN115434819A (en) * | 2022-08-12 | 2022-12-06 | 中联重科股份有限公司 | Method and device for controlling power matching, electronic equipment and engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103557151B (en) * | 2013-11-15 | 2015-11-25 | 中联重科股份有限公司 | Displacement control method and device of multi-variable pump and concrete pumping equipment |
| CN103557151A (en) * | 2013-11-15 | 2014-02-05 | 中联重科股份有限公司 | Displacement control method and device of multi-variable pump and concrete pumping equipment |
| CN105525905A (en) * | 2014-09-28 | 2016-04-27 | 徐工集团工程机械股份有限公司 | Power self-adaptive control system of rotary drilling rig and power self-adaptive control method of rotary drilling rig |
| CN105525905B (en) * | 2014-09-28 | 2019-02-26 | 徐工集团工程机械股份有限公司 | A kind of rotary drilling rig adaptive power control system and method |
| CN108131364A (en) * | 2017-12-25 | 2018-06-08 | 徐州重型机械有限公司 | A kind of power drive system and its control method |
| CN115434819B (en) * | 2022-08-12 | 2024-04-12 | 中联重科股份有限公司 | Method and device for controlling power matching, electronic equipment and engineering machinery |
| CN115434819A (en) * | 2022-08-12 | 2022-12-06 | 中联重科股份有限公司 | Method and device for controlling power matching, electronic equipment and engineering machinery |
| 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 |
| CN116792350A (en) * | 2023-08-11 | 2023-09-22 | 北京碎得环保科技有限公司 | Hydraulic system power distribution method and device and hydraulic system |
| CN116792350B (en) * | 2023-08-11 | 2024-04-30 | 北京碎得环保科技有限公司 | Hydraulic system power distribution method and device and hydraulic system |
| CN117341535A (en) * | 2023-12-04 | 2024-01-05 | 四川鼎鸿智电装备科技有限公司 | Intelligent electric engineering machinery energy management method and system |
| CN117341535B (en) * | 2023-12-04 | 2024-02-06 | 四川鼎鸿智电装备科技有限公司 | Intelligent electric engineering machinery energy management method and system |
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