CN102493953B - Energy-saving control system, truck crane and energy-saving control method - Google Patents
Energy-saving control system, truck crane and energy-saving control method Download PDFInfo
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Abstract
The invention provides an energy-saving control system. The energy-saving control system comprises an operating device, a pressure sensor, a frequency converter, a controller and a variable displacement pump, wherein the operating device is used for transmitting the flow required by the variable displacement pump to the controller; the pressure sensor senses a load pressure signal of an actuating mechanism and transmits the load pressure signal to the controller; the frequency converter feeds back a current rotating speed signal and a current torque signal of a motor to the controller so as to adjust the rotating speed and the torque of the motor according to a first adjusting command; the controller is connected to the frequency converter, the variable displacement pump and the pressure sensor, calculates an initial rotating speed value and an initial torque value of the motor and a displacement value of the variable displacement pump according to the required flow, the current rotating speed signal, the current torque signal and the load pressure signal, generates the first adjusting command and sends the first adjusting command to the frequency converter, and generates a second adjusting command and sends the second adjusting command to the variable displacement pump; and the variable displacement pump adjusts the displacement according to the second adjusting command. The high-efficiency combined control over the rotating speed and the torque of the motor and the displacement of the variable displacement pump starting from a required variable, namely the single variable of the variable displacement pump is realized.
Description
Technical field
The present invention relates to a kind of energy-saving control system, in particular to energy-saving control system, truck crane and energy-saving control method.
Background technique
At present, in the system by motoring oil hydraulic pump, be mainly the rotating speed of adjusting pedal and adjust motor by frequency, energy-saving efficiency is not very high, can not guarantee that moment of torsion is enough simultaneously and well hydraulic system be protected; And in system by diesel engine drives oil hydraulic pump, mainly rotating speed and the hydraulic pressure pump delivery of adjusting motor by controller, adjustment of rotational speed precision is not high, the mode complexity that rotating speed is chosen simultaneously, and the oil consumption of motor also will change with its accumulated operating time.
In correlation technique, energy-saving control system as shown in Figure 1, it adjusts rotating speed and the hydraulic pressure pump delivery of motor by controller, adopt this power save mode, it is not high that the speed of motor is adjusted precision, and moment of torsion is uncontrollable, may cause causing engine misses because of moment of torsion deficiency; Speed is chosen mode complexity; The oil consumption meeting of motor is with the fluctuation of motor Cumulative Elapsed Time, and optimum oil consumption point cannot be proofreaied and correct.
Summary of the invention
Consider above-mentioned background technology, a technical problem to be solved by this invention is to provide a kind of energy-saving control system, another technical problem to be solved by this invention is to provide a kind of truck crane with this energy-saving control system, another technical problem to be solved by this invention is to provide a kind of energy-saving control method, can realize the jointly controlling of rotating speed, moment of torsion and variable displacement pump discharge capacity of motor.
According to an aspect of the present invention, a kind of energy-saving control system is provided, comprise motor and variable displacement pump, described motor is in order to drive described variable displacement pump, described energy-saving control system also comprises controller, operation equipment, pressure transducer, frequency variator, wherein, described operation equipment is connected to described controller in order to the required flow of variable displacement pump is sent to described controller; The load pressure signal of pressure sensor senses actuator is also sent to described controller by described load pressure signal; Frequency variator is between described motor and described controller, in order to by the current tach signal of described motor and current torque signal feed back to described controller, and in the time of the first regulating command receiving from described controller, regulate rotating speed and the moment of torsion of described motor, to mate the initial speed value and the initial torque value that are calculated by described controller; Described controller, be connected to described frequency variator, described variable displacement pump and described pressure transducer, calculate the displacement value of the described initial speed value of described motor, described initial torque value and described variable displacement pump according to described required flow, described current tach signal, described current torque signal and described load pressure signal, generate described the first regulating command and be sent to described frequency variator according to described initial speed value and described initial torque value, generating the second regulating command and be sent to described variable displacement pump according to the displacement value of described variable displacement pump; Described variable displacement pump, is connected to described motor and described controller, in the time receiving described the second regulating command, regulates its discharge capacity, the described displacement value calculating to meet described controller.
In technique scheme, preferably, described controller can also comprise Energy Saving Algorithm module, wherein said Energy Saving Algorithm module specifically comprises: the first computing unit, calculate the initial speed value scope of described motor according to the response time of the acceleration of the current tach signal of motor, described motor and described motor based on acceleration formula, according to variable displacement pump formula for displacement calculation, described initial speed value scope and described required flow, calculate described variable pump delivery scope; The second computing unit, calculates the torque value scope of described motor according to described variable pump delivery scope and described load pressure signal based on torque arithmetic formula; The 3rd computing unit, according to the loss of torque model of described initial speed value scope and described variable displacement pump, determine in the loss of machine of torque amount initial speed value of described motor and the corresponding displacement value of described variable displacement pump hour, calculate in loss of machine of torque amount described initial torque value hour according to described corresponding displacement value, described load pressure signal and described torque arithmetic formula, wherein, described loss of torque model is the discrete data set of loss of machine of torque amount that variable displacement pump is set up according to actual tests test data under various rotating speeds, various discharge capacity.
In technique scheme, preferably, described controller can also comprise judging unit, for judging whether the initial torque value of being calculated by described the 3rd computing unit belongs within the scope of the torque value that described the second computing unit calculates, whether the result of calculation of determining described the second computing unit with this is correct, and in the time that result of calculation is correct, judge whether the current torque value that described current torque signal is corresponding meets the initial torque value calculating, if judged result is no, regulate the output torque of described motor.
In technique scheme, preferably, described variable displacement pump formula for displacement calculation is Q
flow=Q
discharge capacity× n, described Q
flowthe required flow of described variable displacement pump, described Q
discharge capacitydescribed variable pump delivery, the rotating speed that described n is described motor.
In technique scheme, preferably, described torque arithmetic formula is
described T is the moment of torsion of described motor, and described Δ P is institute's load pressure signal, described Q
discharge capacityfor described variable pump delivery, described η
mhfor mechanical-hydraulic efficiency.
In technique scheme, preferably, described controller obtains current tach signal and the current torque signal of described motor by CAN bus.
According to technological scheme of the present invention, by the direct corresponding flow of operation equipment, rotating speed, moment of torsion and variable pump delivery to motor jointly control, realize the control that is converted into unitary variant by the control of multiple variable, make control mode more effective, realize maximum energy-saving target, improved to a great extent energy-saving efficiency.In continuous regular time interval, the rotating speed by controller to motor and moment of torsion and variable pump delivery are optimized.
Also, by reasonably limiting the acceleration of motor, reduce the impact of motor to system, make electrical network (energy storage device) and element can receive protection.In addition, flow, for hydraulic system provides working flow, has reduced the off-load flow of hydraulic system according to demand, and then has reduced the idle work of hydraulic system, has also protected pipeline and the solenoid valve of hydraulic system simultaneously, has extended the working life of parts.
According to a further aspect in the invention, also provide a kind of truck crane, comprised the energy-saving control system described in above arbitrary technological scheme.
According to a further aspect of the invention, a kind of energy-saving control method is also provided, for passing through motoring variable displacement pump, comprise the following steps: step 202, obtain the required flow of variable displacement pump by operation equipment, by the load pressure signal of pressure sensor senses actuator and obtain current tach signal and the current torque signal of motor by frequency variator; Step 204, calculates the displacement value of initial speed value, initial torque value and the variable displacement pump of described motor according to described required flow, described current tach signal, described current torque signal and described load pressure signal; Step 206, regulate the rotating speed of described electric motor car by described frequency variator, the described initial speed value of calculating with coupling, regulate the input torque of described electric motor car by described frequency variator, the described initial torque value of calculating with coupling and the displacement value that regulates described variable displacement pump, to mate the displacement value of the described variable displacement pump calculating.
In technique scheme, preferably, described step 204 can also comprise: the initial speed value scope that calculates described motor based on acceleration formula according to the response time of the acceleration of the current tach signal of motor, described motor and described motor, according to variable displacement pump formula for displacement calculation, described initial speed value scope and described required flow, calculate described variable pump delivery scope; Calculate the torque value scope of described motor according to described variable pump delivery scope and described load pressure signal based on torque arithmetic formula; According to the loss of torque model of described initial speed value scope and described variable displacement pump, determine in the loss of machine of torque amount initial speed value of described motor and the corresponding displacement value of described variable displacement pump hour, calculate in loss of machine of torque amount described initial torque value hour according to described corresponding displacement value, described load pressure signal and described torque arithmetic formula, wherein, described loss of torque model is the discrete data set of loss of machine of torque amount that variable displacement pump is set up according to actual tests test data under various rotating speeds, various discharge capacity.
In technique scheme, preferably, described step 204 can also comprise: whether the initial torque value that judgement is calculated belongs within the scope of the torque value calculating, determine that with this whether result of calculation is correct, and in the time that result of calculation is correct, whether the judgement current torque value corresponding with described current torque signal meets the initial torque value calculating, if judged result is no, regulates the output torque of described motor.
In technique scheme, preferably, described variable displacement pump formula for displacement calculation is Q
flow=Q
discharge capacity× n, described Q
flowthe required flow of described variable displacement pump, described Q
discharge capacitydescribed variable pump delivery, the rotating speed that described n is described motor.
In technique scheme, preferably, described torque arithmetic formula is
described T is the moment of torsion of described motor, and described Δ P is the induced pressure value that described load pressure signal is corresponding, described Q
discharge capacityfor described variable pump delivery, described η
mhfor mechanical-hydraulic efficiency.
In technique scheme, preferably, described operation equipment comprises operating grip, provides the required flow of described variable displacement pump by described operating grip.
According to technological scheme of the present invention, by the direct corresponding flow of operation equipment, rotating speed, moment of torsion and variable pump delivery to motor jointly control, realize the control that is converted into unitary variant by the control of multiple variable, make control mode more effective, realize maximum energy-saving target, improved to a great extent energy-saving efficiency.In continuous regular time interval, the rotating speed by controller to motor and moment of torsion and variable pump delivery are optimized.
Also, by reasonably limiting the acceleration of motor, reduce the impact of motor to system, make electrical network (energy storage device) and element can receive protection.In addition, flow, for hydraulic system provides working flow, has reduced the off-load flow of hydraulic system according to demand, and then has reduced the idle work of hydraulic system, has also protected pipeline and the solenoid valve of hydraulic system simultaneously, has extended the working life of parts.
Brief description of the drawings
Fig. 1 is the schematic diagram of the energy-saving control system in correlation technique;
Fig. 2 shows the schematic diagram of energy-saving control system according to an embodiment of the invention;
Fig. 3 shows the block diagram of controller according to an embodiment of the invention; And
Fig. 4 shows the flow chart of energy-saving control method according to an embodiment of the invention.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.
Set forth in the following description a lot of details so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
For those skilled in the art are understood better according to technological scheme of the present invention, will describe according to energy-saving control system of the present invention example below.
Fig. 2 shows the schematic diagram of energy-saving control system according to an embodiment of the invention.
As shown in Figure 2, energy-saving control system comprises motor 104 and variable displacement pump 114 according to an embodiment of the invention, described motor 104 is in order to drive described variable displacement pump 114, described energy-saving control system also comprises operation equipment 116, pressure transducer, frequency variator 110, controller 112 and actuator 102, wherein:
Operation equipment 116, can comprise operating grip, and it is connected to controller 112, in order to the required flow of variable displacement pump 114 is sent to controller 112;
Pressure transducer is also sent to controller 112 by this load pressure signal in order to the load pressure signal of sensing (hydraulic system) actuator 102;
Frequency variator 110 is between motor 104 and controller 112, in order to by the current tach signal of motor 104 and current torque signal feed back to controller 112, and in the time receiving the first regulating command of self-controller 112, regulate rotating speed and the moment of torsion of motor 104, to mate the initial speed value and the initial torque value that are calculated by controller 112;
Controller 112, be connected to frequency variator 110, variable displacement pump 114 and pressure transducer, calculate the displacement value of initial speed value, initial torque value and the variable displacement pump of motor 104 according to required flow, current tach signal, current torque signal and load pressure signal, generate the first regulating command and be sent to frequency variator 110 according to initial speed value and initial torque value, generate the second regulating command and be sent to variable displacement pump 114 according to the displacement value of variable displacement pump 114;
Variable displacement pump 114, is connected to motor 104 and controller 112, in the time receiving the second regulating command, regulates its discharge capacity, the displacement value calculating to meet controller 112.
Like this, the required flow of the variable displacement pump providing by operation equipment just can be adjusted the rotating speed of motor and moment of torsion, variable pump delivery is adjusted simultaneously, realized the control that is converted into unitary variant (as the required flow of variable displacement pump) by the control of multiple variable (as the rotating speed of motor and moment of torsion, variable pump delivery).
Wherein, preferably, as shown in Figure 3, controller 112 can comprise Energy Saving Algorithm module 118, and Energy Saving Algorithm module 118 specifically can comprise:
The first computing unit 120, calculate the initial speed value scope of motor 104 according to the response time of the acceleration of the current tach signal of motor 104, motor 104 and motor 104 based on acceleration formula, according to variable displacement pump formula for displacement calculation, initial speed value scope and required flow, calculate the discharge capacity scope of variable displacement pump 114;
The second computing unit 122, calculates the torque value scope of motor 104 according to the discharge capacity scope of variable displacement pump 114 and load pressure signal based on torque arithmetic formula;
The 3rd computing unit 124, according to the loss of torque model of initial speed value scope and variable displacement pump 114, determine in the loss of machine of torque amount initial speed value of motor 104 and the corresponding displacement value of variable displacement pump 114 hour, calculate in loss of machine of torque amount initial torque value hour according to corresponding displacement value, load pressure signal and torque arithmetic formula, wherein, loss of torque model is the discrete data set of loss of machine of torque amount that variable displacement pump 114 is set up according to actual tests test data under various rotating speeds, various discharge capacity.
From above-mentioned computational process, technological scheme of the present invention is without considering oil consumption fluctuation, adopt motoring oil hydraulic pump, and the tachometer value of motor and torque value, variable pump delivery directly calculate by controller, utilize frequency variator can accurately control rotating speed and the moment of torsion of motor, to mate result of calculation.
At this, it should be appreciated by those skilled in the art, loss of torque model provides the corresponding points of a series of rotating speed, discharge capacity and loss of machine of torque amount, therefore the initial speed value scope based on calculating, can find out within the scope of this, the point of loss of machine of torque amount minimum, has determined discharge capacity and initial speed value that this point is corresponding, then corresponding displacement value and induced pressure value substitution torque arithmetic formula just can be calculated in the initial torque value of hour motor of loss of machine of torque amount.
Therefore, can consider the acceleration of motor, response time and the induced pressure of motor, calculate the rotating speed and moment of torsion and the variable pump delivery that meet the motor under this operating mode, and can make the loss of machine of torque amount minimum of motor, realize energy-efficient.
It should be noted that, variable displacement pump 114 and actuator 102 are arranged in hydraulic system.
In addition, controller 112 can also comprise judging unit 126, for judging whether the initial torque value of being calculated by the 3rd computing unit 124 belongs within the scope of the torque value that the second computing unit 122 calculates, whether the result of calculation of determining the second computing unit 122 with this is correct, if incorrect, current external information (current rotating speed and the moment of torsion of motor of the system of Resurvey, induced pressure) recalculate suitable torque value), and in the time that result of calculation is correct, further can also judge whether the current torque value that current torque signal is corresponding meets the initial torque value calculating, if judged result is no, need to regulate the output torque of motor 104.
Wherein, variable displacement pump formula for displacement calculation is Q
flow=Q
discharge capacity× n, Q
flowthe required flow of variable displacement pump, Q
discharge capacitythe discharge capacity of variable displacement pump 114, n is the rotating speed of motor 104.Torque arithmetic formula is
t is the moment of torsion of motor 104, and Δ P is the induced pressure value that load pressure signal is corresponding, Q
discharge capacityfor the discharge capacity of variable displacement pump 114, η
mhfor mechanical-hydraulic efficiency.
It should be noted that, controller 112 can obtain by CAN bus current tach signal and the current torque signal of motor 104.
Operation equipment 116 can comprise operating grip, by the aperture determining positions of operating grip the required flow of variable displacement pump, provide the required flow of variable displacement pump by operating grip.
Therefore, energy-saving control system according to the present invention provides the required flow of variable displacement pump by operating grip and detects the induced pressure of actuator by pressure transducer; Obtain the current speed of motor and moment of torsion by CAN bus; Utilize the Energy Saving Algorithm module of controller to calculate motor optimized rotating speed, optimum moment of torsion and variable displacement pump discharge capacity; Regulate rotating speed and the moment of torsion of motor, to mate the above-mentioned motor optimized rotating speed calculating, optimum moment of torsion, and while Moderator Variable pump delivery, make it the variable displacement pump discharge capacity that coupling is calculated.
Can be applied to truck crane according to energy-saving control system of the present invention, should be appreciated that, can also be applied to the engineering machinery of other use motoring hydraulic systems.
Fig. 4 shows the flow chart of energy-saving control method according to an embodiment of the invention.
As shown in Figure 4, energy-saving control method comprises according to an embodiment of the invention, for passing through motoring variable displacement pump, following steps: step 202, obtain the required flow of variable displacement pump by operation equipment, by the load pressure signal of pressure sensor senses actuator and obtain current tach signal and the current torque signal of motor by frequency variator; Step 204, calculates the displacement value of initial speed value, initial torque value and the variable displacement pump of motor according to required flow, current tach signal, current torque signal and load pressure signal; Step 206, regulate the rotating speed of electric motor car by frequency variator, to mate the described initial speed value of calculating, regulate the input torque of electric motor car by frequency variator, initial torque value and the Moderator Variable pump delivery value calculated with coupling, to mate the displacement value of the variable displacement pump calculating.
In technique scheme, preferably, step 204 can also comprise: the initial speed value scope that calculates motor based on acceleration formula according to the current tach signal of motor, the acceleration of motor and the response time of motor, according to variable displacement pump formula for displacement calculation, initial speed value scope and required flow, calculate variable pump delivery scope; Calculate the torque value scope of motor according to variable pump delivery scope and load pressure signal based on torque arithmetic formula; According to the loss of torque model of initial speed value scope and variable displacement pump, determine in the loss of machine of torque amount initial speed value of motor and the corresponding displacement value of variable displacement pump hour, calculate in loss of machine of torque amount initial torque value hour according to corresponding displacement value, load pressure signal and torque arithmetic formula, wherein, loss of torque model is the discrete data set of loss of machine of torque amount that variable displacement pump is set up according to actual tests test data under various rotating speeds, various discharge capacity.
Because the acceleration magnitude of motor has determined the impact to electric wiring, reasonably accekeration, system allow response time (response time of motor) and the current rotating speed of motor can determine the scope of motor speed, for example suppose that the current rotating speed of motor is 600rpm, suppose that acceleration is 100 turn/s, system response time (or response time of motor) is 2s, and the initial speed value that can calculate motor according to acceleration formula is 400～800rpm.
In technique scheme, preferably, step 204 can also comprise: whether the initial torque value that judgement is calculated belongs within the scope of the torque value calculating, determine that with this whether result of calculation is correct, and in the time that result of calculation is correct, judge whether the current torque value corresponding with current torque signal meets the initial torque value calculating, if judged result is no, regulate the output torque of motor.
At this, should be appreciated that, the flow providing according to operation equipment needs signal and the definite load pressure signal of pressure transducer to revise the initial torque value of the above-mentioned motor calculating and initial speed value, variable pump delivery, can be within fixing continuously system response time, rotating speed, moment of torsion and variable pump delivery to motor are optimized.
Wherein, variable displacement pump formula for displacement calculation is Q
flow=Q
discharge capacity× n, Q
flowthe required flow of variable displacement pump, Q
discharge capacityvariable pump delivery, the rotating speed that n is motor.
Wherein, torque arithmetic formula is
t is the moment of torsion of motor, and Δ P is the induced pressure value that load pressure signal is corresponding, Q
discharge capacityfor variable pump delivery, η
mhfor mechanical-hydraulic efficiency.
Operation equipment 116 to be to comprise operating grip, by the aperture determining positions of operating grip the required flow of variable displacement pump, provide the required flow of variable displacement pump by operating grip.
It should be noted that, controller 112 can obtain by CAN bus current tach signal and the current torque signal of motor 104.
According to technological scheme of the present invention, by the direct corresponding flow of operation equipment, rotating speed, moment of torsion and variable pump delivery to motor jointly control, realize the control that is converted into unitary variant by the control of multiple variable, make control mode more effective, realize maximum energy-saving target, improved to a great extent energy-saving efficiency.In continuous regular time interval, the rotating speed by controller to motor and moment of torsion and variable pump delivery are optimized.
Also, by reasonably limiting the acceleration of motor, reduce the impact of motor to system, make electrical network (energy storage device) and element can receive protection.In addition, flow, for hydraulic system provides working flow, has reduced the off-load flow of hydraulic system according to demand, and then has reduced the idle work of hydraulic system, has also protected pipeline and the solenoid valve of hydraulic system simultaneously, has extended the working life of parts.
These are only the preferred embodiments of the present invention, be not limited to the present invention, 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 amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (14)
1. an energy-saving control system, comprises motor (104) and variable displacement pump (114), and described motor, in order to drive described variable displacement pump, is characterized in that, described energy-saving control system also comprises:
Controller (112), operation equipment (116), pressure transducer, frequency variator (110), wherein,
Described operation equipment (116) is connected to described controller (112), in order to the required flow of described variable displacement pump (114) is sent to described controller (112);
Described pressure transducer is sent to described controller (112) in order to the load pressure signal of sensing actuator (102) and by described load pressure signal;
Described frequency variator (110) is positioned between described motor (104) and described controller (112), in order to by the current tach signal of described motor (104) and current torque signal feed back to described controller (112), and in the time of the first regulating command receiving from described controller (112), regulate rotating speed and the moment of torsion of described motor (104), to mate the initial speed value and the initial torque value that are calculated by described controller (112);
Described controller (112) is connected to described frequency variator (110), described variable displacement pump (114) and described pressure transducer, according to described required flow, described current tach signal, described current torque signal and described load pressure signal calculate the described initial speed value of described motor (104), the displacement value of described initial torque value and described variable displacement pump (114), generate described the first regulating command and be sent to described frequency variator (110) according to described initial speed value and described initial torque value, generate the second regulating command and be sent to described variable displacement pump (114) according to the displacement value of described variable displacement pump (114),
Described variable displacement pump (114) is connected to described motor (104) and described controller (112), in the time receiving described the second regulating command, regulate its discharge capacity, the described displacement value calculating to meet described controller (112);
Wherein, described controller (112) comprises Energy Saving Algorithm module (118), and wherein said Energy Saving Algorithm module (118) specifically comprises:
The first computing unit (120), calculate the initial speed value scope of described motor (104) according to the response time of the acceleration of the current tach signal of motor (104), described motor (104) and described motor (104) based on acceleration formula, according to variable displacement pump (114) formula for displacement calculation, described initial speed value scope and described required flow, calculate the discharge capacity scope of described variable displacement pump (114);
The 3rd computing unit (124), according to the loss of torque model of described initial speed value scope and described variable displacement pump (114), determine in the loss of machine of torque amount initial speed value of described motor (104) and the corresponding displacement value of described variable displacement pump (114) hour, according to described corresponding displacement value, described load pressure signal and torque arithmetic formula calculate in loss of machine of torque amount described initial torque value hour, wherein, described loss of torque model is that variable displacement pump (114) is at various rotating speeds, the discrete data set of the loss of machine of torque amount of setting up according to actual tests test data under various discharge capacities.
2. energy-saving control system according to claim 1, it is characterized in that, described Energy Saving Algorithm module (118) also comprises: the second computing unit (122), calculates the torque value scope of described motor (104) according to the discharge capacity scope of described variable displacement pump (114) and described load pressure signal based on torque arithmetic formula.
3. energy-saving control system according to claim 2, is characterized in that, described controller (112) also comprises:
Judging unit (126), for judging whether the initial torque value of being calculated by described the 3rd computing unit belongs within the scope of the torque value that described the second computing unit calculates, whether the result of calculation of determining described the second computing unit with this is correct, and in the time that result of calculation is correct, judge whether the current torque value that described current torque signal is corresponding meets the initial torque value calculating, if judged result is no, regulate the output torque of described motor (104).
4. energy-saving control system according to claim 2, is characterized in that, described variable displacement pump formula for displacement calculation is Q
flow=Q
discharge capacity× n, described Q
flowfor the required flow of described variable displacement pump (114), described Q
discharge capacityfor the discharge capacity of described variable displacement pump (114), described n is the rotating speed of described motor (104).
5. energy-saving control system according to claim 2, is characterized in that, described torque arithmetic formula is
described T is the moment of torsion of described motor (104), and described Δ P is institute's load pressure signal, described Q
discharge capacityfor the discharge capacity of described variable displacement pump (114), described η
mhfor mechanical-hydraulic efficiency.
6. according to the energy-saving control system described in any one in claim 1 to 5, it is characterized in that, described controller (112) obtains current tach signal and the current torque signal of described motor (104) by CAN bus.
7. according to the energy-saving control system described in any one in claim 1 to 5, it is characterized in that, described operation equipment (116) comprises operating grip, provides the required flow of described variable displacement pump by described operating grip.
8. a truck crane, is characterized in that, comprises the energy-saving control system as described in any one in claim 1 to 7.
9. an energy-saving control method, for by motoring variable displacement pump, is characterized in that, comprises the following steps:
Step 202, obtains the required flow of variable displacement pump by operation equipment, by the load pressure signal of pressure sensor senses actuator and obtain current tach signal and the current torque signal of motor by frequency variator;
Step 204, calculates the displacement value of initial speed value, initial torque value and the variable displacement pump of described motor according to described required flow, described current tach signal, described current torque signal and described load pressure signal;
Step 206, regulate the rotating speed of described motor by described frequency variator, the described initial speed value of calculating with coupling, regulate the input torque of described motor by described frequency variator, the described initial torque value of calculating with coupling and the displacement value that regulates described variable displacement pump, the displacement value of the described variable displacement pump calculating with coupling
Wherein, described step 204 also comprises:
Calculate the initial speed value scope of described motor according to the response time of the acceleration of the current tach signal of motor, described motor and described motor based on acceleration formula;
According to the loss of torque model of described initial speed value scope and described variable displacement pump, determine in the loss of machine of torque amount initial speed value of described motor and the corresponding displacement value of described variable displacement pump hour, calculate in loss of machine of torque amount described initial torque value hour according to described corresponding displacement value, described load pressure signal and torque arithmetic formula, wherein, described loss of torque model is the discrete data set of loss of machine of torque amount that variable displacement pump is set up according to actual tests test data under various rotating speeds, various discharge capacity.
10. energy-saving control method according to claim 9, is characterized in that,
Described step 204 also comprises:
According to variable displacement pump formula for displacement calculation, described initial speed value scope and described required flow, calculate described variable pump delivery scope;
Calculate the torque value scope of described motor according to described variable pump delivery scope and described load pressure signal based on torque arithmetic formula.
11. energy-saving control methods according to claim 10, is characterized in that, described step 204 also comprises:
Whether the initial torque value that judgement is calculated belongs within the scope of the torque value calculating, determine that with this whether result of calculation is correct, and in the time that result of calculation is correct, whether the judgement current torque value corresponding with described current torque signal meets the initial torque value calculating, if judged result is no, regulate the output torque of described motor.
12. energy-saving control methods according to claim 10, is characterized in that, described variable displacement pump formula for displacement calculation is Q
flow=Q
discharge capacity× n, described Q
flowfor the required flow of described variable displacement pump, described Q
discharge capacityfor described variable pump delivery, the rotating speed that described n is described motor.
13. energy-saving control methods according to claim 10, is characterized in that, described torque arithmetic formula is
described T is the moment of torsion of described motor, and described Δ P is the induced pressure value that described load pressure signal is corresponding, described Q
discharge capacityfor described variable pump delivery, described η
mhfor mechanical-hydraulic efficiency.
14. according to the energy-saving control method described in any one in claim 9 to 13, it is characterized in that, described operation equipment comprises operating grip, provides the required flow of described variable displacement pump by described operating grip.
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| CN103062027B (en) * | 2012-12-24 | 2013-12-25 | 北汽福田汽车股份有限公司 | Control method used for concrete pumping machinery and controller |
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