CN101325393B - Transmission system for engineering machinery - Google Patents
Transmission system for engineering machinery Download PDFInfo
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- CN101325393B CN101325393B CN200810133248XA CN200810133248A CN101325393B CN 101325393 B CN101325393 B CN 101325393B CN 200810133248X A CN200810133248X A CN 200810133248XA CN 200810133248 A CN200810133248 A CN 200810133248A CN 101325393 B CN101325393 B CN 101325393B
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Abstract
The invention relates to a driving system used in the engineering mechanism, comprising an engine, a motor and an electric energy adjusting device, wherein the engine drives the motor to run, and the output end of the motor is connected with the electric energy adjusting device, also comprising a load feedback device, a rotating speed computing device and a speed changer, wherein the load feedback device is used for receiving the load status signal, and the rotating speed computing device is used for computing the given rotating speed of the engine according to the load status signal, while the speed changer is used for instructing the engine to run according to the given speed. The invention adjusts the rotating speed of the engine according to the size of the load, makes the rotating speed of the engine adaptable with the load, and makes full use of the braking energy generated when the load brakes to reduce the fuel oil consumption, which has excellent fuel economical efficiency.
Description
Technical field
The present invention relates to the drive system field, particularly relate to a kind of drive system that is used for engineering machinery.
Background technology
Engineering machinery, particularly large-scale engineering machinery is as goliath, excavator etc., but, can not adopt electrical network to provide electric energy for engineering machinery sometimes because of the site environment restriction, engineering machinery is utilized inner electricity generation system generating, and the electric energy that generates is sent to load, to guarantee operate as normal.
Consult Fig. 1, the existing drive system that is used for engineering machinery is shown, comprise engine 11, motor 12, reach electric energy adjustment device 13.Engine 11 can be petrol engine or Diesel engine, and the wheel shaft that engine 11 drives motor 12 runs up, and generates electric energy, again electric energy is supplied with main load by electric energy adjustment device 13, directly offers assistant load simultaneously.
Electric energy adjustment device 13 comprises parallel 8 branch roads that are connected between the positive and negative busbar, and wherein, the 1st, 2,3 branch roads are the input branch road, and the 4th branch road is the voltage stabilizing branch road, and the 5th branch road is the copped wave branch road, and the 6th, 7,8 branch roads are the output branch road.
The 1st branch road comprises the diode D1 and the diode D2 of polyphone, and the negative pole of diode D1 connects positive bus-bar, and the positive pole of diode D2 connects negative busbar, and the common port of diode D1 and diode D2 is connected first input end by inductance L 1; The 2nd branch road comprises the diode D3 and the diode D4 of polyphone, and the negative pole of diode D3 connects positive bus-bar, and the positive pole of diode D4 connects negative busbar, and the common port of diode D3 and diode D4 is connected second input by inductance L 2; The 3rd branch road comprises the diode D5 and the diode D6 of polyphone, and the negative pole of diode D5 connects positive bus-bar, and the positive pole of diode D6 connects negative busbar, and the common port of diode D5 and diode D6 is connected the 3rd input by inductance L 3.
The three-phase alternating current of motor 12 outputs after inductance L 1, inductance L 2, inductance L 3 filtering, is input to the 1st branch road, the 2nd branch road and the 3rd branch road respectively respectively.At the 1st branch road, alternating current is by on the mutual positive bus-bar and negative busbar that put on direct current of diode D1 and diode D2.The operation principle of the 2nd branch road, the 3rd branch road is identical with the 1st branch road, repeats no more.
The 4th branch road comprises the capacitor C 1 and the capacitor C 2 of polyphone, and capacitor C 1 and capacitor C 2 are stablized the voltage between positive and negative busbar by discharging and recharging.
The 5th branch road comprises the power semiconductor P1 and the resistance R 1 of polyphone, and and resistance R 1 antiparallel diode D7.Voltage is excessive when between positive and negative busbar, power controlling semiconductor element P1 conducting, and electric current flows to negative busbar through resistance R 1 from positive bus-bar, and the part electric energy consumes on resistance R 1, prevents that voltage is excessive between positive and negative busbar.
The 6th branch road comprises the power semiconductor P2 and the power semiconductor P3 of polyphone, and the common port of power semiconductor P2 and power semiconductor P3 is connected first output; The 7th branch road comprises the power semiconductor P4 and the power semiconductor P5 of polyphone, and the common port of power semiconductor P4 and power semiconductor P5 is connected second output; The 8th branch road comprises the power semiconductor P6 and the power semiconductor P7 of polyphone, and the common port of power semiconductor P6 and power semiconductor P7 is connected the 3rd output.Each power semiconductor all comprises an antiparallel diode.
At the 6th branch road, the 7th branch road, the 8th branch road, the conducting by power controlling semiconductor element in an orderly manner respectively, end, can be at first output, second output, the controlled three-phase alternating voltage of the 3rd output output frequency, supply load uses.
Drive system mainly is by the adjusting to engine 11 rotating speeds and motor 12 excitations in control, constant with the voltage of the three-phase alternating current of keeping output and frequency.For keeping the constant of output frequency, the rotating speed of engine 11 need be maintained constant.Motor 12 inner excitation unit are by keeping the stable of output voltage to the adjusting of exciting current.
The electric energy of motor 12 outputs directly offers assistant load.
Engineering machinery at work, load is light and the braking situation is more, for example, wait for, descend operation, translation operation etc., the required electric energy of load at this moment is less, but engine 11 is in order to keep the constant of output voltage frequency, in the work gamut, all rotating speed is maintained higher rated speed, as, 1500rpm or 1800rpm influence the economy of fuel oil.
Load actuator is in when braking, can the feedback portion of energy to the positive and negative busbar of electric energy adjustment device 13, make that voltage raises between positive and negative busbar, but this part electric energy is consumed by resistance R 1, can not well be utilized to save fuel oil.
Summary of the invention
Technical problem to be solved by this invention provides a kind of drive system that is used for engineering machinery, and this drive system has good fuel economy.
A kind of drive system that is used for engineering machinery of the present invention, comprise engine, motor, reach electric energy adjustment device, described engine drives described motor operation, described motor output end connects described electric energy adjustment device, also comprise the load feedback device, rotating speed arithmetic unit, and speed setting unit: described load feedback device is used to receive the load state signal; Described rotating speed arithmetic unit is used for the setting rotating speed according to the described engine of this load state calculated signals; Described speed setting unit is used to instruct described engine to move by above-mentioned setting rotating speed.
Preferably, described electric energy adjustment device comprises positive and negative busbar, controlled input, reaches controlled output, and described controlled input and described controlled output are connected in parallel between described positive and negative busbar; Described controlled input receives first control command, is used for being sent to described positive and negative busbar according to the electric energy that described first control command is exported described motor, or the electric energy on the described positive and negative busbar is passed back to described motor; Described controlled output receives second control command, is used for according to described second control command electric energy on the described positive and negative busbar being sent to load, or the electric energy that load is returned is sent on the described positive and negative busbar.
Preferably, described controlled input is made up of 2 branch roads that are connected in parallel between the described positive and negative busbar at least, each branch road all comprises two controllable switch element of polyphone, and the conduction terminal of two controllable switch element is contacted mutually, and the common port of two controllable switch element connects the corresponding output end of described motor.
Preferably, described controllable switch element is a power semiconductor.
Preferably, described electric energy adjustment device also comprises the auxiliary controlled output that is connected between described positive and negative busbar: described auxiliary controlled output, receive the 3rd control command, be used for the electric energy on the described positive and negative busbar being outputed to assistant load according to described the 3rd control command.
Preferably, described auxiliary controlled output comprises positive and negative primary and secondary line, at least 2 branch roads are connected in parallel between the described positive and negative primary and secondary line, each branch road comprises two controllable switch element of polyphone, the conduction terminal of two controllable switch element is contacted mutually, and the common port of two controllable switch element connects the respective input of assistant load.
Preferably, described controllable switch element is a power semiconductor.
Preferably, described electric energy adjustment device also comprises filter circuit, and described filter circuit is connected with described auxiliary controlled output, is used for the voltage of described auxiliary controlled output output is carried out Filtering Processing.
Preferably, described electric energy adjustment device also comprises booster circuit, and described booster circuit is connected on the described positive and negative busbar, is used for when starting, and voltage between described positive and negative busbar raises.
Preferably, described booster circuit comprises accessory power supply U1, inductance L 7, triode Q1, capacitor C 6, diode D2, the positive pole of accessory power supply U1 is by the positive pole of inductance L 7 connection diode D2, and the negative pole of diode D2 connects positive bus-bar, and the negative pole of accessory power supply U1 connects negative busbar; Capacitor C 6 is arranged between the negative pole of diode D2 negative pole and accessory power supply U1, and the collector electrode of triode Q1 connects diode D2 positive pole, and emitter connects the negative pole of accessory power supply U1, the signal that base stage receives control triode Q1 conducting, ends.
Preferably, described booster circuit comprises accessory power supply U1, inductance L 7, capacitor C 6, power semiconductor P20, reaches power semiconductor P21, behind power semiconductor P20 and the power semiconductor P21 polyphone, and capacitor C 6 is connected in parallel between positive and negative busbar, the positive pole of accessory power supply U1 is by the common port of inductance L 7 connection power semiconductor P20 and power semiconductor P21, and the negative pole of accessory power supply U1 connects negative busbar.
Preferably, drive system also comprises voltage check device, torque arithmetic unit, and torque adjustment apparatus: described voltage check device, be used to detect the voltage between described electric energy adjustment device positive and negative busbar, and obtain the voltage detecting value; Described torque arithmetic unit is used for calculating the setpoint torque of described motor according to voltage setting value and above-mentioned voltage detecting value; Described torque adjustment apparatus is used for instructing described motor to move by above-mentioned setpoint torque.
Preferably, drive system also comprises speed detector, power limited device, and the first torque limiting device: described speed detector, be used to detect the rotating speed of described engine, and obtain the rotating speed detected value; Described power limited device is used for the maximum positive of described engine obtaining maximum electronic torque divided by above-mentioned rotating speed detected value; The maximum negative power of described engine divided by above-mentioned rotating speed detected value, is obtained the maximum regeneration torque; The first torque limiting device is used for during greater than the electronic torque of above-mentioned maximum, setpoint torque being adjusted into maximum electronic torque at above-mentioned setpoint torque; During less than above-mentioned maximum regeneration torque, setpoint torque is adjusted into the maximum regeneration torque at above-mentioned setpoint torque.
Preferably, drive system also comprises: the second torque limiting device is used for during greater than the maximum positive torque of described engine, setpoint torque being adjusted into maximum positive torque at above-mentioned setpoint torque; When above-mentioned setpoint torque is born torque less than the maximum of described engine, the setpoint torque value is adjusted into maximum negative torque.
Compared with prior art, the present invention has the following advantages:
Engineering machinery is in when work, the electric energy difference that different operating modes is required, and the present invention adapts engine speed and load according to the rotating speed of load size adjustment engine.In load hour, engine is only kept lower rotating speed, to save fuel oil.With respect to prior art, engine is kept the higher nominal rotating speed at work, and drive system of the present invention has good fuel economy.
The present invention can be sent to load-side with electric energy by motor side neatly by controlled input and controlled output, electric energy can also be transmitted back to motor side by load-side, realizes the two-way flow of electric energy.During the load braking, the unnecessary electric energy of a meeting feedback part, this feedback energy can be back to positive and negative busbar by controlled output, by controlled input this feedback electric energy is back to the motor and the engine of input side again, this moment, engine can significantly reduce oil spout, reached fuel-efficient purpose.
Description of drawings
Fig. 1 is the existing drive system schematic diagram that is used for engineering machinery;
Fig. 2 is used for the drive system schematic diagram of engineering machinery for first embodiment of the invention;
Fig. 3 is the structural representation of first embodiment of the invention electric energy adjustment device;
Fig. 4 is the structural representation of second embodiment of the invention electric energy adjustment device;
Fig. 5 is the circuit diagram of first embodiment of the invention electric energy adjustment device;
Fig. 6 is the circuit diagram of second embodiment of the invention electric energy adjustment device;
Fig. 7 is the circuit diagram of third embodiment of the invention electric energy adjustment device;
Fig. 8 is used for the drive system schematic diagram of engineering machinery for second embodiment of the invention;
Fig. 9 is used for the drive system schematic diagram of engineering machinery for third embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The present invention is by detecting load state, according to the rotating speed of load size adjustment engine, in load hour, reduces engine speed; When load is big, increase engine speed, engine speed and load are adapted, and energy can be by electric energy adjustment device to reach the purpose of two-way flow.The braking power that makes full use of load reduces the fuel consume of engine, to obtain good fuel economy.
Consult Fig. 2, the drive system that first embodiment of the invention is used for engineering machinery is shown, comprise electricity generation system and load feedback system, electricity generation system comprises engine 21, motor 22, reaches electric energy adjustment device 23, the load feedback system comprises load feedback device 24, rotating speed arithmetic unit 25, and speed setting unit 26.
Engineering machinery is in when work, the electric energy difference that different operating modes is required, and the present invention adapts engine 21 rotating speeds and load according to the rotating speed of load size adjustment engine 21.In load hour, 21 in engine is kept lower rotating speed, to save fuel oil.With respect to prior art, engine is kept the higher nominal rotating speed at work, and drive system of the present invention has good fuel economy.
Consult Fig. 3, the structure of first embodiment of the invention electric energy adjustment device 23 is shown, comprise positive and negative busbar 231, controlled input 232, reach controlled output 233.Controlled input 232 and controlled output 233 are connected in parallel between the positive and negative busbar 231.
Controlled input 232 receives first control command, is sent on the positive and negative busbar 231 according to the electric energy of first control command with motor 22 outputs, or the electric energy on the positive and negative busbar 231 is passed back on the motor 22.Controlled output 233 receives second control command, according to second control command electric energy on the positive and negative busbar 231 is outputed to load, or the electric energy that load is returned is sent on the positive and negative busbar 231.Wherein, controlled input 232 and controlled output 233 specific implementation circuit have multiple mode, and as at each input, output circuit uses the controllable switch element of polyphone, the conducting by the control controllable switch element, end, and effectively Control current flows to.
The present invention can be sent to load-side with electric energy by motor 22 sides neatly by controlled input 232 and controlled output 233, electric energy can also be transmitted back to motor 22 sides by load-side, realizes the two-way flow of electric energy.During the load braking, meeting feedback part electric energy, this feedback energy can be back to positive and negative busbar 231 by controlled output 233, by controlled input 232 this feedback electric energy is back to motor 22 again, to save fuel oil.
Consult Fig. 4, the structure of second embodiment of the invention electric energy adjustment device 23 is shown, comprise positive and negative busbar 231, controlled input 232, controlled output 233, auxiliary controlled output 234, reach filter circuit 235.Controlled input 232, controlled output 233, auxiliary controlled output 234 are connected in parallel between the positive and negative busbar 231.
Auxiliary controlled output 234 receives the 3rd control command, according to the 3rd control command the electric energy on the positive and negative busbar 231 is outputed to assistant load.Assistant load can be the signal lamp of engineering machinery, communicator etc.Filter circuit 235 is connected with auxiliary controlled output 234, and the voltage that auxiliary controlled output 234 is exported carries out Filtering Processing.
Auxiliary controlled output 234 is connected in parallel on the positive and negative busbar 231, the energy that is produced during the load braking is back to positive and negative busbar 231 by controlled output 233, output on the assistant load by auxiliary controlled output 234 again, for assistant load provides electric energy, prevent that this part electric energy is consumed on electric energy adjustment device 23, reduce energy consumption, to save fuel oil.
Consult Fig. 5, the circuit of first embodiment of the invention electric energy adjustment device 23 is shown, the three-phase voltage of motor 22 outputs connects the controlled input 232 of electric energy adjustment device 23 respectively by inductance L 1, inductance L 2, inductance L 3.Controlled input 232 is made up of three branch roads that are connected in parallel between the positive and negative busbar 231, and first branch road comprises power semiconductor P1, the power semiconductor P2 of polyphone, and the common port of power semiconductor P1 and power semiconductor P2 is connected inductance L 1; Second branch road comprises power semiconductor P3, the power semiconductor P4 of polyphone, and the common port of power semiconductor P3 and power semiconductor P4 is connected inductance L 2; The 3rd branch road comprises power semiconductor P5, the power semiconductor P6 of polyphone, and the common port of power semiconductor P5 and power semiconductor P6 is connected inductance L 3.
Power semiconductor P1 and power semiconductor P2, power semiconductor P3 and power semiconductor P4, power semiconductor P5 and power semiconductor P6 are complementary relationship, system can by to the control of power semiconductor P1～P6 to reach the purpose of regulating motor output torque.
The present invention realizes that by controlled input 232 electric energy of 231 of motor 22 and positive and negative busbars is mutual, and when load was braked, the feedback energy of generation can be back to motor 22 by positive and negative busbar 231,, to save fuel oil.
Capacitor C 1 and capacitor C 2 are connected between the positive and negative busbar 231, to stablize the voltage of 231 of positive and negative busbars.
After resistance R 1 and the diode D1 inverse parallel, and power semiconductor P7 is connected between the positive and negative busbar 231 positive pole of diode D1 connection power semiconductor P7, negative pole connection positive bus-bar.When between positive and negative busbar during overtension, power semiconductor P7 opens, and electric current flows to negative busbar through resistance R 1 from positive bus-bar, and electric energy consumes on resistance R 1, and the voltage between the control positive and negative busbar 231 is unlikely to too high.Controlled output 233 is made up of three branch roads that are connected in parallel between the positive and negative busbar 231, first branch road comprises power semiconductor P8, the power semiconductor P9 of polyphone, and power semiconductor P8 is connected load input terminal with the common port of power semiconductor P9; Second branch road comprises power semiconductor P10, the power semiconductor P11 of polyphone, and power semiconductor P10 is connected the input of load with the common port of power semiconductor P11; The 3rd branch road comprises power semiconductor P12, the power semiconductor P13 of polyphone, and power semiconductor P12 is connected load input terminal with the common port of power semiconductor P13.
Operation principle by identical with controlled input 232 by controlled output 233, realizes the two-way flow of electric energy between load and the positive and negative busbar 231.
The positive and negative primary and secondary line of auxiliary controlled output 234 is connected on the positive and negative busbar 231, and three identical branch roads of structure are connected in parallel between the positive and negative primary and secondary line.Wherein, first branch road comprises power semiconductor P14, the power semiconductor P15 of polyphone, and the common port of power semiconductor P14 and power semiconductor P15 is connected inductance L 4 one ends, and inductance L 4 other ends connect the assistant load input; Second branch road comprises power semiconductor P16, the power semiconductor P17 of polyphone, and the common port of power semiconductor P16 and power semiconductor P17 is connected inductance L 5 one ends, and inductance L 5 other ends connect the assistant load input; The 3rd branch road comprises power semiconductor P18, the power semiconductor P19 of polyphone, and the common port of power semiconductor P18 and power semiconductor P19 is connected inductance L 6 one ends, and inductance L 6 other ends connect the assistant load input.Capacitor C 3 connects between the output of second, third branch road, and capacitor C 4 connects between the output of first, second branch road, and capacitor C 5 connects between the output of the first, the 3rd branch road.
When the overtension of 231 of positive and negative busbars, the power semiconductor by the auxiliary controlled output 234 of ordered control can be sent to the voltage of 231 of positive and negative busbars between positive and negative primary and secondary line, is loaded into assistant load.When load was braked, the voltage of feedback was transferred to assistant load, to save the consumption of fuel oil.
When motor 22 was asynchronous machine, the excitation of asynchronous machine came from stator side, and during the electricity generation system starting, needing is positive and negative busbar 231 chargings by external booster circuit at first.After the voltage of positive and negative busbar 231 reaches certain numerical value, asynchronous machine is carried out excitation and starts.
Consult Fig. 6, the circuit of second embodiment of the invention electric energy adjustment device 23 is shown, booster circuit comprises accessory power supply U1, K switch 1, inductance L 7, triode Q1, capacitor C 6, diode D2, the positive pole of accessory power supply U1 is connected the positive pole of diode D2 with inductance L 7 by K switch 1, the negative pole of diode D2 connects positive bus-bar, and the negative pole of accessory power supply U1 connects negative busbar.Capacitor C 6 is arranged between the negative pole of diode D2 negative pole and accessory power supply U1, and the collector electrode of triode Q1 connects diode D2 positive pole, and emitter connects the negative pole of accessory power supply U1, the signal that base stage receives control triode Q1 conducting, ends.
Consult Fig. 7, the circuit of third embodiment of the invention electric energy adjustment device 23 is shown, booster circuit comprises accessory power supply U1, K switch 1, inductance L 7, capacitor C 4, power semiconductor P20, reaches power semiconductor P21, behind power semiconductor P20 and the power semiconductor P21 polyphone, and capacitor C 4 is connected in parallel on 231 of positive and negative busbars, the positive pole of accessory power supply U1 passes through K switch 1 is connected power semiconductor P20 and power semiconductor P21 with inductance L 7 common port, and the negative pole of accessory power supply U1 connects negative busbar.
The present invention is by regulating the torque of motor 22, and the voltage on the control electric energy adjustment device 23 on the positive and negative busbar 231 so that during the load braking, more feeds back electric energy and is added on the positive and negative busbar 231, and be back to motor 22, better saves fuel oil.
Consult Fig. 8, the drive system that second embodiment of the invention is used for engineering machinery is shown, comprise electricity generation system, load feedback system, torque reponse system, electricity generation system comprises engine 21, motor 22, reaches electric energy adjustment device 23, the load feedback system comprises load feedback device 24, rotating speed arithmetic unit 25, and speed setting unit 26, the torque reponse system comprises voltage check device 27, torque arithmetic unit 28, and torque adjustment apparatus 29.
The test side of voltage check device 27 is connected with the positive and negative busbar of electric energy adjustment device 23, output is connected with the input of torque arithmetic unit 28, the output of torque arithmetic unit 28 connects the input of torque adjustment apparatus 29, the output of torque adjustment apparatus 29 connects motor 22, Voltage Feedback on electric energy adjustment device 23 positive and negative busbars to motor 22, is effectively regulated the torque of motor 22.
The present invention is by the torque of torque reponse system demodulation motor 22, provide under the situation of enough power to the load use at engine 21, make the voltage of positive and negative busbar 231 can keep stable, when load is braked, the feedback energy that braking is produced can better offer motor 22 sides or auxiliary load side, reduce the consumption of energy, better save fuel oil.
The present invention can also limit above-mentioned setpoint torque by the maximum positive torque of engine 21 rotating speeds and motor 22, maximum negative torque, prevents that setpoint torque is excessive or too small, influences the normal operation of drive system.
Consult Fig. 9, the drive system that third embodiment of the invention is used for engineering machinery is shown, comprise electricity generation system, load feedback system, torque reponse system, and torque limiting system, electricity generation system comprises engine 21, motor 22, and electric energy adjustment device 23, and the load feedback system comprises load feedback device 24, rotating speed arithmetic unit 25, and speed setting unit 26, the torque reponse system comprises voltage check device 27, torque arithmetic unit 28, and torque adjustment apparatus 29.The torque limiting system comprises speed detector 30, power limited device 31, the first torque limiting device 32, reaches the second torque limiting device 33.
The rotating speed of speed detector 30 detection of engine 21 obtains the rotating speed detected value, and this rotating speed detected value is sent to power limited device 31.
Power limited device 31 divided by above-mentioned rotating speed detected value, obtains maximum electronic torque with engine 21 maximum positive; The maximum negative power of described engine divided by above-mentioned rotating speed detected value, is obtained the maximum regeneration torque.Power limited device 31 sends to the first torque limiting device 32 with electronic torque of maximum and maximum regeneration torque.
The first torque limiting device 32 during greater than the electronic torque of maximum, is adjusted into maximum electronic torque with setpoint torque at setpoint torque; During less than above-mentioned maximum regeneration torque, setpoint torque is adjusted into the maximum regeneration torque at setpoint torque.
Setpoint torque is T, and maximum positive is Pmax, and maximum negative power is Pmin, and the current rotating speed of engine is N; Maximum electronic torque T1=Pmax/N; Maximum regeneration torque T2=Pmin/N;
As, T＞T1, then T=T1; T＜T1, then T is constant;
T＜T2, then T=T2; T＞T2, then T is constant.
The second torque limiting device 33 during greater than the maximum positive torque of described engine, is adjusted into maximum positive torque with setpoint torque at above-mentioned setpoint torque; When above-mentioned setpoint torque is born torque less than the maximum of described engine, setpoint torque is adjusted into maximum negative torque.
Maximum positive torque is Tmax, and maximum negative torque is Tmin;
As, T＞Tmax, then T=Tmax; T＜Tmax, then T is constant;
T＜Tmin, then T=Tmin; T＞Tmin, then T is constant.
More than to a kind of drive system that is used for engineering machinery provided by the present invention, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (14)
1. drive system that is used for engineering machinery, comprise engine, motor, reach electric energy adjustment device, described engine drives described motor operation, described motor output end connects described electric energy adjustment device, it is characterized in that, also comprise the load feedback device, rotating speed arithmetic unit, and speed setting unit:
Described load feedback device is used to receive the load state signal;
Described rotating speed arithmetic unit is used for the setting rotating speed according to the described engine of this load state calculated signals;
Described speed setting unit is used to instruct described engine to move by above-mentioned setting rotating speed.
2. drive system as claimed in claim 1 is characterized in that, described electric energy adjustment device comprises positive and negative busbar, controlled input, reaches controlled output, and described controlled input and described controlled output are connected in parallel between described positive and negative busbar;
Described controlled input receives first control command, is used for being sent to described positive and negative busbar according to the electric energy that described first control command is exported described motor, or the electric energy on the described positive and negative busbar is passed back to described motor;
Described controlled output receives second control command, is used for according to described second control command electric energy on the described positive and negative busbar being sent to load, or the electric energy that load is returned is sent on the described positive and negative busbar.
3. drive system as claimed in claim 2, it is characterized in that, described controlled input is made up of 2 branch roads that are connected in parallel between the described positive and negative busbar at least, each branch road all comprises two controllable switch element of polyphone, the conduction terminal of two controllable switch element is contacted mutually, and the common port of two controllable switch element connects the corresponding output end of described motor.
4. drive system as claimed in claim 3 is characterized in that, described controllable switch element is a power semiconductor.
5. drive system as claimed in claim 2 is characterized in that, described electric energy adjustment device also comprises the auxiliary controlled output that is connected between described positive and negative busbar:
Described auxiliary controlled output receives the 3rd control command, is used for according to described the 3rd control command the electric energy on the described positive and negative busbar being outputed to assistant load.
6. drive system as claimed in claim 5, it is characterized in that, described auxiliary controlled output comprises positive and negative primary and secondary line, at least 2 branch roads are connected in parallel between the described positive and negative primary and secondary line, each branch road comprises two controllable switch element of polyphone, the conduction terminal of two controllable switch element is contacted mutually, and the common port of two controllable switch element connects the respective input of assistant load.
7. drive system as claimed in claim 6 is characterized in that, described controllable switch element is a power semiconductor.
8. drive system as claimed in claim 5 is characterized in that described electric energy adjustment device also comprises filter circuit, and described filter circuit is connected with described auxiliary controlled output, is used for the voltage of described auxiliary controlled output output is carried out Filtering Processing.
9. drive system as claimed in claim 2 is characterized in that described electric energy adjustment device also comprises booster circuit, and described booster circuit is connected on the described positive and negative busbar, is used for when starting, and voltage between described positive and negative busbar raises.
10. drive system as claimed in claim 9, it is characterized in that, described booster circuit comprises accessory power supply U1, inductance L 7, triode Q1, capacitor C 6, diode D2, the positive pole of accessory power supply U1 connects the positive pole of diode D2 by inductance L 7, the negative pole of diode D2 connects positive bus-bar, and the negative pole of accessory power supply U1 connects negative busbar; Capacitor C 6 is arranged between the negative pole of diode D2 negative pole and accessory power supply U1, and the collector electrode of triode Q1 connects diode D2 positive pole, and emitter connects the negative pole of accessory power supply U1, the signal that base stage receives control triode Q1 conducting, ends.
11. drive system as claimed in claim 9, it is characterized in that, described booster circuit comprises accessory power supply U1, inductance L 7, capacitor C 6, power semiconductor P20, reaches power semiconductor P21, behind power semiconductor P20 and the power semiconductor P21 polyphone, and capacitor C 6 is connected in parallel between positive and negative busbar, the positive pole of accessory power supply U1 is by the common port of inductance L 7 connection power semiconductor P20 and power semiconductor P21, and the negative pole of accessory power supply U1 connects negative busbar.
12. as each described drive system of claim 1 to 11, it is characterized in that drive system also comprises voltage check device, torque arithmetic unit, and torque adjustment apparatus:
Described voltage check device is used to detect the voltage between described electric energy adjustment device positive and negative busbar, obtains the voltage detecting value;
Described torque arithmetic unit is used for calculating the setpoint torque of described motor according to voltage setting value and above-mentioned voltage detecting value;
Described torque adjustment apparatus is used for instructing described motor to move by above-mentioned setpoint torque.
13. drive system as claimed in claim 12 is characterized in that, drive system also comprises speed detector, power limited device, reaches the first torque limiting device:
Described speed detector is used to detect the rotating speed of described engine, obtains the rotating speed detected value;
Described power limited device is used for the maximum positive of described engine obtaining maximum electronic torque divided by above-mentioned rotating speed detected value; The maximum negative power of described engine divided by above-mentioned rotating speed detected value, is obtained the maximum regeneration torque;
The first torque limiting device is used for during greater than the electronic torque of above-mentioned maximum, setpoint torque being adjusted into maximum electronic torque at above-mentioned setpoint torque; During less than above-mentioned maximum regeneration torque, setpoint torque is adjusted into the maximum regeneration torque at above-mentioned setpoint torque.
14. drive system as claimed in claim 12 is characterized in that, drive system also comprises:
The second torque limiting device is used for during greater than the maximum positive torque of described engine, setpoint torque being adjusted into maximum positive torque at above-mentioned setpoint torque; When above-mentioned setpoint torque is born torque less than the maximum of described engine, setpoint torque is adjusted into maximum negative torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810133248XA CN101325393B (en) | 2008-07-22 | 2008-07-22 | Transmission system for engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810133248XA CN101325393B (en) | 2008-07-22 | 2008-07-22 | Transmission system for engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101325393A CN101325393A (en) | 2008-12-17 |
| CN101325393B true CN101325393B (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810133248XA Expired - Fee Related CN101325393B (en) | 2008-07-22 | 2008-07-22 | Transmission system for engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102916590A (en) * | 2011-08-04 | 2013-02-06 | 宏远创建有限公司 | One-phase-to-triphase economizer |
| CN102817725A (en) * | 2012-08-22 | 2012-12-12 | 中联重科股份有限公司 | Mobile crane and engine revolution speed control method, engine revolution speed control device and engine revolution speed control system thereof |
| CN103291473B (en) * | 2013-06-09 | 2016-06-08 | 华为技术有限公司 | The control method of generating set and device |
| CN106470883B (en) * | 2014-06-20 | 2019-10-25 | 派克汉尼芬公司 | Power efficiency control mechanism for Work machine |
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