CN103277201A - Electronic-controlled engine, energy-saving method of electronic-controlled engine, energy-saving device of electronic-controlled engine and engineering machine - Google Patents
Electronic-controlled engine, energy-saving method of electronic-controlled engine, energy-saving device of electronic-controlled engine and engineering machine Download PDFInfo
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- CN103277201A CN103277201A CN201310144842XA CN201310144842A CN103277201A CN 103277201 A CN103277201 A CN 103277201A CN 201310144842X A CN201310144842X A CN 201310144842XA CN 201310144842 A CN201310144842 A CN 201310144842A CN 103277201 A CN103277201 A CN 103277201A
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Abstract
The invention discloses an electronic-controlled engine, an energy-saving method of the electronic-controlled engine, an energy-saving device of the electronic-controlled engine and an engineering machine. The energy-saving method of the electronic-controlled engine comprises the steps of obtaining output power of the electronic-controlled engine according to actual operation working conditions of the engineering machine, determining the current operation mode of the electronic-controlled engine according to the output power, determining an universal characteristic curve corresponding to the current operation mode according to the current operation mode, according to the universal characteristic curve, determining the optimal rotation speed of the electronic-controlled engine, adjusting the current actual rotation speed of the electronic-controlled engine into the optimal rotation speed, and enabling the electronic-controlled engine to operate in an optimal oil consumption area corresponding to the current working condition. Therefore, the optimal oil consumption area can be correspondingly set according to loads, and the purpose of effectively reducing energy consumption of the whole engine can be achieved according to the working condition with different loads.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of electric-control motor and power-economizing method thereof, energy saving device and engineering machinery.
Background technique
Along with development of global economy, engineering machinery has obtained developing on an unprecedented scale, wherein, though hydraulic shovel can carry out high-power, highly sensitive various operations, but the overall utilization of its energy only about 20%, huge energy loss makes power-saving technology become current major subjects.Wherein, motor is the power source of excavator, along with the enhancing of the whole world to environmental consciousness, carries the more and more of Europe III, Europe IV electric-control motor, how to optimize the oil consumption that improves electric-control motor, will become the main flow of hydraulic shovel control system from now on.
At present, traditional excavator adopts mechanical type oil-fired system motor mostly, according to the difference of operation operating mode, system is divided into heavy duty (H) and two kinds of mode of operations of underloading (L).Under traditional heavy duty (H), underloading (L) pattern, universal characteristic curve of engine is certain, and mechanical type oil-fired system motor can't be set many universal characteristic curves, can not allow heavy duty (H), underloading (L) all be operated in the optimum oil consumption district of motor.
In addition, existing electric-control motor is with engine speed and the baseband signal of load as reflection motor actual conditions, determine basic fuel injection quantity and injection timing with reference to corresponding fuel injection quantity and the injection timing arteries and veins spectrogram of each operating mode of motor that is drawn by test, according to various factors (as water temperature, oil temperature, atmospheric pressure etc.) it is carried out various compensation then, thereby obtain best fuel injection quantity and injection timing or ignition timing, control output by final controlling element then.Though the energy-saving scheme of existing electric-control motor can realize that excavator is energy-conservation, has following problem:
As shown in Figure 1, though the energy-saving scheme that has according to changing load the external characteristic curve of motor, that is to say, maximum output to motor simply limits, but the specific fuel consumption curve in the universal characteristic curve of motor is not carried out corresponding demarcation, namely to when reducing engine power, realize reducing oil consumption.In addition, the optimum oil consumption district is close underloading (L) pattern often, during heavy duty (H) high capacity, and the power height, corresponding oil consumption also can't improve, and therefore can not both take into account simultaneously, so oil-saving effect is limited.
Summary of the invention
In view of this, the present invention proposes a kind of electric-control motor and power-economizing method, energy saving device and engineering machinery, can be at the optimum oil consumption district of the regulating working conditions correspondence of different load, thus reach energy-conservation purpose.
For achieving the above object, technological scheme of the present invention is achieved in that
On the one hand, the invention provides a kind of power-economizing method of electric-control motor, this method comprises:
According to the actual job operating mode of engineering machinery, obtain the output power of electric-control motor, determine the work pattern that electric-control motor is current according to described output power, and determine corresponding with it universal characteristic curve according to current work pattern; According to described universal characteristic curve, determine the optimum speed of described electric-control motor, and the current actual speed of described electric-control motor is adjusted to optimum speed, described electric-control motor is moved in the optimum oil consumption zone of corresponding current working.
Further, in the said method, the obtain manner of described universal characteristic curve comprises:
Gather moment of torsion and rotating speed under the electric-control motor different work pattern; Described moment of torsion and rotating speed are demarcated, set up the relation of rotating speed and moment of torsion, make corresponding with work pattern respectively electric-control motor universal characteristic curve.
Further, in the said method, described work pattern comprises: underloading work pattern and heavily loaded work pattern;
Described universal characteristic curve comprises: underloading work pattern universal characteristic curve and heavily loaded work pattern universal characteristic curve; Described underloading work pattern universal characteristic curve is corresponding to the underloading work pattern; Heavy duty work pattern universal characteristic curve is corresponding to heavily loaded work pattern.
Further, in the said method, the current work pattern of described definite electric-control motor comprises:
According to the size of the output power of described electric-control motor, judge whether it falls into the power range of underloading work pattern correspondence, if then the current work pattern of described electric-control motor is the underloading work pattern; Otherwise the current work pattern of electric-control motor is heavily loaded work pattern.
Alternatively, in the said method, work pattern comprises: underloading work pattern, one-level heavy duty work pattern, secondary heavy duty work pattern, three grades of heavily loaded work patterns; Described universal characteristic curve comprises: underloading work pattern universal characteristic curve, one-level heavy duty work pattern universal characteristic curve, secondary heavy duty work pattern universal characteristic curve, and three grades of heavily loaded work pattern universal characteristic curves.
With respect to prior art, the present invention has following advantage:
The power-economizing method of the electric-control motor of the embodiment of the invention is by extracting the actual load operating point, and according to as underloading, severe duty, the corresponding universal characteristic curve of formulating electric-control motor, by the demarcation to electric-control motor rotating speed and load, obtain corresponding operating mode in the optimum oil consumption zone, and need not to change external characteristic curve, namely under equal power rating, can be at the height of load, correspondence arranges the optimum oil consumption district, thereby at the operating mode of different load, reach the purpose of effective reduction complete machine energy consumption.
On the other hand, the present invention also provides a kind of energy saving device of electric-control motor, and this energy saving device comprises: storage is configured to store the universal characteristic curve for the optimum speed of determining electric-control motor; Acquisition instrument, the output power that is configured to gather described electric-control motor; Controller, be configured to the affiliated work pattern of definite described output power, and according to the described work pattern selection universal characteristic curve corresponding with described work pattern, and determine the optimum speed of described electric-control motor by described universal characteristic curve, and be configured to the current actual speed of described electric-control motor is adjusted to optimum speed.
Further, in the said apparatus, described work pattern comprises underloading work pattern and heavily loaded work pattern, and described universal characteristic curve comprises underloading work pattern universal characteristic curve and heavily loaded work pattern universal characteristic curve; Wherein, described underloading work pattern universal characteristic curve is corresponding to the underloading work pattern; Heavy duty work pattern universal characteristic curve is corresponding to heavily loaded work pattern.
Further, in the said apparatus, work pattern comprises: underloading work pattern, one-level heavy duty work pattern, secondary heavy duty work pattern, three grades of heavily loaded work patterns; Described universal characteristic curve comprises: underloading work pattern universal characteristic curve, one-level heavy duty work pattern universal characteristic curve, secondary heavy duty work pattern universal characteristic curve, and three grades of heavily loaded work pattern universal characteristic curves.
Another aspect also proposes a kind of electric-control motor, is provided with above-mentioned any described energy saving device in this electric-control motor.
With respect to prior art, the present invention has following advantage:
The present invention is fixed at the enterprising rower of existing electric-control motor, so reforming cost is low.The present invention is according to operating modes such as underloading, heavy duties, be provided with the universal characteristic curve of two groups or more motor, by the setting to engine speed and load, realize that corresponding operating mode is in the optimum oil consumption zone, thereby effectively reduce the complete machine energy consumption, and need not to change external characteristic curve, oil-saving effect is obvious.
Correspondingly, the present invention also proposes a kind of engineering machinery, is provided with above-mentioned any described electric-control motor.
Because above-mentioned any electric-control motor has above-mentioned technique effect, therefore, the engineering machinery that is provided with this electric-control motor also should possess corresponding technique effect.
Description of drawings
The accompanying drawing that constitutes a part of the present invention is used to provide 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 constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic representation that engine load data is gathered in the correlation technique;
Fig. 2 is the schematic flow sheet of the power-economizing method of embodiment of the invention electric-control motor;
Fig. 3 is the structural representation of embodiment of the invention electric-control motor load data collecting device;
Fig. 4 is the light load universal characteristic curve of engine schematic representation of the embodiment of the invention;
Fig. 5 is the heavy-duty engine universal characteristic curve schematic representation of the embodiment of the invention;
Fig. 6 is the energy saving device structured flowchart of embodiment of the invention electric-control motor.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technological scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment who obtains under the creative work prerequisite.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the present invention can make up mutually.
Basic thought of the present invention is: design a kind of power-economizing method of electric-control motor, make the universal characteristic curve that has corresponding relation with the output power of electric-control motor, and determine corresponding with it universal characteristic curve according to the output power of electric-control motor; According to described universal characteristic curve, determine the optimum speed of described electric-control motor, and the current actual speed of described electric-control motor is adjusted to optimum speed, described electric-control motor is moved in the optimum oil consumption zone of corresponding current working, thereby reach purpose of energy saving.
Below in conjunction with accompanying drawing, each preferred embodiment of the present invention is described further:
The power-economizing method embodiment of electric-control motor
With reference to Fig. 2, it shows the power-economizing method of embodiment of the invention electric-control motor.
Need to prove that in the present embodiment, by hour oil consumption of engineering machinery (present embodiment is example with the excavator) is done following analysis as can be known, hour oil consumption of excavator is H=W*r/0.85/1000, wherein:
H---hour oil consumption, the L/h of unit;
R---specific fuel consumption value, the g/kWh of unit;
W---engine output, the kW of unit;
Therefore, under with constant power W, as long as the relatively variation of specific fuel consumption value r can obtain hour comparing result of oil consumption H, thereby, can choose the corresponding rotating speed of value that hour oil consumption H is less as to the optimum speed of motor under current working.So, for solve exist in the prior art can't compatible different load operating mode carry out effective problem of energy saving, a kind of power-economizing method of electric-control motor is proposed, may further comprise the steps:
Present embodiment is the power-economizing method that example is introduced electric-control motor with the excavator: present embodiment can be according to the high and low load area of excavator operation, carry out the actual job of excavator, by electric-control motor ECM(Engine Control Module, moment of torsion and rotating speed distribute when engine control module) obtaining actual job, this parameter by the electric-control motor stand test, is set the universal characteristic curve MAP figure of two groups of electric-control motors.Can guarantee to be operated in the optimum oil consumption district of motor at traditional underloading work pattern (L), be operated in the optimum oil consumption district of motor simultaneously at heavily loaded work pattern (H) too, realize energy-conservation.
S102: gather moment of torsion and the rotating speed of electric-control motor, and it is put in order;
Wherein, this step can for example at the high and low load area of excavator operation, be obtained load data such as moment of torsion and the rotation speed change parameter of motor according to the actual conditions of engineering machinery such as excavator by the ECM of electric-control motor.
And, can gather and put in order described load data by data collecting instrument herein, thus the underloading of acquisition electric-control motor and heavy duty load distributed data.
S104: by the electric-control motor stand test described moment of torsion and rotating speed are demarcated, and made the universal characteristic curve of electric-control motor; Wherein, the output power of this universal characteristic curve and described electric-control motor has corresponding relation;
In this step, the universal characteristic curve of making electric-control motor comprises the steps:
S1041: determine actual speed and the moment of torsion relation of electric-control motor, and in described universal characteristic curve, demarcate the specific fuel consumption curve;
S1042: obtain under constant power the optimum oil consumption zone.
Need to prove that present embodiment can arrange according to underloading and two kinds of work patterns of heavy duty, described universal characteristic curve comprises: underloading work pattern universal characteristic curve and heavily loaded work pattern universal characteristic curve.
Need to prove that all carry out when above-mentioned steps does not need to use the power-economizing method of present embodiment at every turn, above-mentioned steps is used for obtaining the universal characteristic curve of electric-control motor.Usually, the obtain manner of described universal characteristic curve comprises: gather moment of torsion and rotating speed under the electric-control motor different work pattern; Described moment of torsion and rotating speed are demarcated, set up the relation of rotating speed and moment of torsion, make corresponding with work pattern respectively electric-control motor universal characteristic curve.
S106: obtain the output power of electric-control motor, determine the work pattern that electric-control motor is current according to described output power, and determine corresponding with it universal characteristic curve according to current work pattern;
For example, when described universal characteristic curve comprises underloading, heavily loaded work pattern universal characteristic curve, describedly determine that according to described output power corresponding with it universal characteristic curve comprises the steps:
S1061: the size according to the output power of described electric-control motor arranges underloading work pattern and heavily loaded work pattern;
S1062: described underloading work pattern universal characteristic curve is corresponding to the underloading work pattern; Heavy duty work pattern universal characteristic curve is corresponding to heavily loaded work pattern;
S1063: judge whether accessed described output power drops in the underloading work pattern;
S1064: if drop in the underloading work pattern, then according to the described underloading work pattern universal characteristic curve corresponding with described underloading work pattern, the actual speed that described electric-control motor is current is adjusted to optimum speed;
S1065: if do not drop in the underloading work pattern, then it falls into described heavily loaded work pattern as can be known, according to the heavily loaded work pattern universal characteristic curve corresponding with described heavily loaded work pattern, the actual speed that described electric-control motor is current is adjusted to optimum speed.
S108: according to described universal characteristic curve, determine the optimum speed of described electric-control motor, and the current actual speed of described electric-control motor is adjusted to optimum speed, described electric-control motor is moved in the optimum oil consumption zone of corresponding current working.
Below in conjunction with an example, above-mentioned power-economizing method is described:
With reference to Fig. 3, it shows the implementation procedure of power-economizing method of the electric-control motor of this example.In this example, when excavator carried out actual underloading and heavily loaded operation, motor ECM sent the load distributed data of motor by the CAN bus, and these data are gathered by data collecting instrument.By underloading and the heavy duty load distributed data of arrangement motor, the underloading data are demarcated by the electric-control motor stand test, make the universal characteristic curve MAP figure that obtains under the electric-control motor underloading load condition.For example, with reference to Fig. 4, it has gone out the electric-control motor universal characteristic curve embodiment under the light load operating mode.Among the universal characteristic curve MAP figure shown in Figure 4, the optimum oil consumption zone is the a-quadrant.Adopt similar mode, make heavily loaded universal characteristic curve MAP figure, among the electric-control motor universal characteristic curve embodiment under the load condition as shown in Figure 5, the optimum oil consumption zone is the C zone.
It is pointed out that traditional energy-conservation pattern that arranges, can only guarantee the energy-conservation of underloading or severe duty, and can not be at different operating modes.Optimum oil consumption zone as shown in Figure 4, as the a-quadrant, and heavy duty zone shown in Figure 5 is less economical at Fig. 4 intermediate fuel oil, as the B zone.Be 230g/kWh in the center region as this regional specific fuel consumption value of Fig. 4, and equal high-load region specific fuel consumption value is 205g/kWh among Fig. 5, than the fuel-efficient pact of traditional approach (230-205)/230=10.9%, can realize simultaneously that excavator is regional as Fig. 4 and high-load region such as Fig. 5 fuel economy in larger scope in light load, the sharpest edges of performance electric-control motor.
Optionally, in above-described embodiment, can also be set to more than two groups according to the described universal characteristic curve of operation operating mode.
For example, four groups of following universal characteristic curves are set: underloading work pattern universal characteristic curve, one-level heavy duty work pattern universal characteristic curve, secondary heavy duty work pattern universal characteristic curve, and three grades of heavily loaded work pattern universal characteristic curves.The work pattern that these universal characteristic curves are corresponding different, respectively corresponding four work patterns of above-mentioned four universal characteristic curves.
Need to prove that in more than two groups work pattern, definite mode that definite mode of the universal characteristic curve corresponding with this work pattern and two above-mentioned group job patterns adopt is similar, can be by that analogy.
In the present embodiment, can be according to engineering machinery actual job operating mode, obtain the real output of electric-control motor, determine electric-control motor present located work pattern, and determine the optimum speed of electric-control motor in this work pattern according to the universal characteristic curve corresponding with this work pattern, and its actual speed is adjusted to this optimum speed.
Need to prove, optimum speed described in the various embodiments described above refers to: in the universal characteristic curve of electric-control motor, put corresponding engine speed along constant power curve and specific fuel consumption contact of a curve, under constant power, the rotating speed of the electric-control motor that oil consumption is hour the most corresponding.
From the various embodiments described above as seen, the power-economizing method of the electric-control motor of the embodiment of the invention extracts the actual load operating point by electric-control motor ECM, and according to underloading, severe duty, formulate the universal characteristic curve MAP figure of two groups of motors, by the demarcation to engine speed and load, obtain corresponding operating mode in the optimum oil consumption zone, thereby can effectively reduce the complete machine energy consumption at the operating mode of different load.
And the power-economizing method of the electric-control motor of present embodiment is by realizing surely that at the enterprising rower of existing electric-control motor reforming cost is low.By revising the universal characteristic curve MAP figure of electric-control motor, be that the software change can realize, engine body and other hardware need not change, namely can realize the optimum oil consumption curve of underloading, two kinds of operating modes of heavy duty, adopt the oil-saving effect of this power-economizing method remarkable.
Need to prove that electric-control motor power-economizing method and the device of the embodiment of the invention need not to change external characteristic curve, namely under equal power rating, can be at the height of load, correspondence arranges the optimum oil consumption district.
The energy saving device embodiment of electric-control motor
More than be the explanation to electric-control motor power-economizing method embodiment of the present invention, here, for realizing said method, the embodiment of the invention also proposes following energy saving device.
With reference to Fig. 6, it shows the energy saving device of the electric-control motor of present embodiment, and this energy saving device adopts the described power-economizing method of above-mentioned arbitrary embodiment.The energy saving device of present embodiment comprises:
Storage is configured to store the universal characteristic curve for the optimum speed of determining electric-control motor;
Acquisition instrument is configured to gather the real output of described electric-control motor;
Controller, be configured to the affiliated work pattern of definite described real output, and according to the described work pattern selection universal characteristic curve corresponding with described work pattern, and determine the optimum speed of described electric-control motor by described universal characteristic curve, and be configured to the current actual speed of described electric-control motor is adjusted to optimum speed.
In above-described embodiment, described work pattern comprises underloading work pattern and heavily loaded work pattern, and described universal characteristic curve comprises underloading work pattern universal characteristic curve and heavily loaded work pattern universal characteristic curve; Wherein, described underloading work pattern universal characteristic curve is corresponding to the underloading work pattern; Heavy duty work pattern universal characteristic curve is corresponding to heavily loaded work pattern.
Therefore, the energy saving device of the electric-control motor of the embodiment of the invention is by extracting the actual load operating point, and according to as underloading, severe duty, formulate the universal characteristic curve MAP figure of two groups of corresponding with it motors, by the demarcation to engine speed and load, obtain corresponding operating mode in the optimum oil consumption zone, thereby can effectively reduce the complete machine energy consumption at the operating mode of different load.
In addition, the energy saving device of the electric-control motor of present embodiment is by realizing surely at the enterprising rower of existing electric-control motor, reforming cost is low, engine body and other hardware need not change, and also need not to change external characteristic curve, namely under equal power rating, can be at the height of load, correspondence arranges the optimum oil consumption district.
Electric-control motor embodiment
Accordingly, can't take into account the problem of different operating modes at existing energy-saving scheme, the embodiment of the invention also proposes a kind of electric-control motor, and this electric-control motor is provided with the described energy saving device of above-mentioned any embodiment.According to underloading, severe duty, be provided with the universal characteristic curve MAP figure of two groups of motors in the control machine of this electric-control motor, by the setting to engine speed and load, realize corresponding operating mode in the optimum oil consumption zone, thereby effectively reduce the complete machine energy consumption.
In the present embodiment, high and low load area according to excavator operation, carry out the actual job of excavator, moment of torsion and rotation speed change parameter distributions when obtaining actual job by electric-control motor ECM, these parameters by the electric-control motor stand test, are set the universal characteristic curve MAP figure of two groups of above electric-control motors by the height correspondence of load.Can guarantee to be operated in the optimum oil consumption district of motor at traditional underloading work pattern (L), be operated in the optimum oil consumption district of motor simultaneously at heavily loaded work pattern (H) too, realization is energy-conservation at different operating modes.
The power-economizing method and the device that it is emphasized that the embodiment of the invention need not to change external characteristic curve, namely under equal power rating, can realize that high and low load really is operated in the optimum oil consumption district.
From the various embodiments described above as can be seen, compared with prior art, the embodiment of the invention has following advantage:
The embodiment of the invention is fixed at the enterprising rower of existing electric-control motor, and reforming cost is low.The embodiment of the invention is provided with the universal characteristic curve MAP figure of two groups or more motor according to operating modes such as underloading, heavy duties, by the setting to engine speed and load, realizes corresponding operating mode in the optimum oil consumption zone, thereby effectively reduces the complete machine energy consumption.That is to say, the embodiment of the invention is by revising the universal characteristic curve MAP figure of electric-control motor, namely the software in the controller of electric-control motor is changed and can be realized, engine body and other hardware need not change, can realize the optimum oil consumption curve as underloading, two kinds of operating modes of heavy duty.
What is particularly worth mentioning is that the energy-saving scheme of the embodiment of the invention and adopt the oil-saving effect of electric-control motor of this energy-saving scheme obvious.
The embodiment of the invention also provides a kind of engineering machinery, for example excavator, grader, loader, this project machinery is provided with above-mentioned any described electric-control motor, because above-mentioned any electric-control motor has above-mentioned technique effect, therefore, the engineering machinery that is provided with this electric-control motor also should possess corresponding technique effect, and its specific implementation process is similar to the above embodiments, does not give unnecessary details now.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation 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 each integrated circuit module respectively, 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.Described storage device is nonvolatile memory, as: ROM/RAM, flash memory, magnetic disc, CD etc.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the power-economizing method of an electric-control motor is characterized in that, comprising:
According to engineering machinery actual job operating mode, obtain the output power of electric-control motor, determine the work pattern that electric-control motor is current according to described output power, and determine corresponding with it universal characteristic curve according to current work pattern;
According to described universal characteristic curve, determine the optimum speed of described electric-control motor, and the current actual speed of described electric-control motor is adjusted to optimum speed, described electric-control motor is moved in the optimum oil consumption zone of corresponding current working.
2. the power-economizing method of electric-control motor according to claim 1 is characterized in that, the obtain manner of described universal characteristic curve comprises:
Gather moment of torsion and rotating speed under the electric-control motor different work pattern;
Described moment of torsion and rotating speed are demarcated, set up the relation of rotating speed and moment of torsion, make corresponding with work pattern respectively electric-control motor universal characteristic curve.
3. the power-economizing method of electric-control motor according to claim 1 and 2 is characterized in that,
Described work pattern comprises: underloading work pattern and heavily loaded work pattern;
Described universal characteristic curve comprises: underloading work pattern universal characteristic curve and heavily loaded work pattern universal characteristic curve; Described underloading work pattern universal characteristic curve is corresponding to the underloading work pattern; Heavy duty work pattern universal characteristic curve is corresponding to heavily loaded work pattern.
4. the power-economizing method of electric-control motor according to claim 3 is characterized in that, the current work pattern of described definite electric-control motor comprises:
According to the size of the output power of described electric-control motor, judge whether it falls into the power range of underloading work pattern correspondence, if then the current work pattern of described electric-control motor is the underloading work pattern; Otherwise the current work pattern of electric-control motor is heavily loaded work pattern.
5. the power-economizing method of electric-control motor according to claim 1 is characterized in that,
Work pattern comprises: underloading work pattern, one-level heavy duty work pattern, secondary heavy duty work pattern, three grades of heavily loaded work patterns;
Described universal characteristic curve comprises: underloading work pattern universal characteristic curve, one-level heavy duty work pattern universal characteristic curve, secondary heavy duty work pattern universal characteristic curve, and three grades of heavily loaded work pattern universal characteristic curves.
6. the energy saving device of an electric-control motor is characterized in that, comprising:
Storage is configured to store the universal characteristic curve for the optimum speed of determining electric-control motor;
Acquisition instrument, the output power that is configured to gather described electric-control motor;
Controller, be configured to the affiliated work pattern of definite described output power, and according to the described work pattern selection universal characteristic curve corresponding with described work pattern, and determine the optimum speed of described electric-control motor by described universal characteristic curve, and the current actual speed of described electric-control motor is adjusted to optimum speed.
7. the energy saving device of electric-control motor according to claim 6 is characterized in that,
Described work pattern comprises underloading work pattern and heavily loaded work pattern, and described universal characteristic curve comprises underloading work pattern universal characteristic curve and heavily loaded work pattern universal characteristic curve;
Wherein, described underloading work pattern universal characteristic curve is corresponding to the underloading work pattern; Heavy duty work pattern universal characteristic curve is corresponding to heavily loaded work pattern.
8. the energy saving device of electric-control motor according to claim 6 is characterized in that,
Work pattern comprises: underloading work pattern, one-level heavy duty work pattern, secondary heavy duty work pattern, three grades of heavily loaded work patterns;
Described universal characteristic curve comprises: underloading work pattern universal characteristic curve, one-level heavy duty work pattern universal characteristic curve, secondary heavy duty work pattern universal characteristic curve, and three grades of heavily loaded work pattern universal characteristic curves.
9. an electric-control motor is characterized in that, is provided with in this electric-control motor as each described energy saving device of claim 6 to 8.
10. an engineering machinery is characterized in that, is provided with electric-control motor as claimed in claim 9.
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