CN101246081A - Environment-friendly speed transmission test device and method - Google Patents

Abstract

The present invention provides an environment-protecting speed changer testing device and the method thereof, one set of alternating-current frequency conversion electric motor is adopted for simulating the engine, the output is connected to the speed changer after speed raising, additionally two sets of alternating frequency conversion electric motor are taken as the load of the speed changer, the electrical energy generated by the load motor is used by the driving electric motor with the common direct current generatrix, and at the same time the PC executes rotation velocity control to the driving electric motor and executes torque control to the load motor. The invention has the advantages of good repeatability, high precision accuracy, avoiding the exhaust discharge and noise pollution of the engine, good environment protecting capability, recycling the electrical energy generated by the load motor, being convenient, economical, electricity-saving and energy-saving.

Description

Environment-friendly speed transmission test device and method

Technical field:

The present invention relates to a kind of novel speed transmission test device and method, particularly the test of automatic transmission.

Background technology:

Traditional Transmission Test Bed utilizes engine as driving, and hydraulic dynamometer or electric eddy current dynamometer absorb energy, does not consider the regeneration problem of energy.Cause a large amount of wastes of energy, and the emission of engine and noise pollute to environment, cause the increase of variator cost of development.

Summary of the invention:

Technical matters to be solved by this invention is: solve the problem that above-mentioned prior art exists, and for the test of variator provides a kind of new, environmental protection, energy-saving test unit and method.This test unit and method are a kind of more efficient, more convenient, more economical test battery system, the operating various operating modes of energy simulated automotive, for the exploitation and the test of variator provides a virtual test platform, for the reproduction of experimental enviroment provide may, utilize this system can replace traditional method of utilizing the test site to test, have environmental protection, efficient, energy-saving advantages.

The technical solution used in the present invention is: this environment-friendly speed transmission test method is: adopt an alternating-current variable frequency motor as drive motor, be in electronic, the work of engine in the simulation test, drive motor output connects the transmission test variator after raising speed, adopt two alternating-current variable frequency motors again, load as variator, the simulated roadway load and the moment of resistance, two load motors are in generating, the electric energy that load motor produced is by the shared dc bus of alternating-current variable frequency motor, and feedback is used for drive motor; Meanwhile, PC is connected with the frequency converter of each motor, and drive motor is carried out rotating speed control, and load motor is carried out moment of torsion control.

This environment-friendly speed transmission test device includes 1 drive motor and frequency converter thereof, 2 load motors and frequency converter thereof, also include the raising speed case, dc bus, PC, drive motor and load motor are alternating-current variable frequency motor, be subjected to Frequency Converter Control separately, drive motor is in electronic, simulated engine work, drive motor output is by being connected to variator after the raising speed case raising speed, variator output connects two load motors respectively, two load motors are in generating, the electric energy that produces is connected to drive motor by dc bus, for using, meanwhile, PC passes through sensor, data acquisition box is gathered drive motor respectively, variator, the service data of load motor, and PC connects the frequency converter of controlling and driving motor respectively by order wire, the frequency converter of load motor is carried out rotating speed control to drive motor, and load motor is carried out moment of torsion control.

In the technique scheme, the PC control system comprises simulation of engine module, driver's analog module, load simulation module, standard cycle operating mode module, engine universal characteristic module.

Good effect of the present invention is method and the device that it provides new energy alternate test place to test for variator, good reproducibility not only, the degree of accuracy height, and the present invention adopts alternating-current variable frequency motor as drive motor, can be in the work of not using simulated engine under the engine conditions, reduced the toxic emission in the test, characteristics with environment-friendly high-efficiency, meanwhile, the present invention adopts the load of two alternating-current variable frequency motors as variator, can not only the simulated roadway load and the moment of resistance, substituting traditional test site tests, and adopt the connected mode of dc bus altogether between the frequency converter of each alternating-current variable frequency motor, realize sharing of energy, two load motors are in generating state, the electric energy that is produced uses for drive motor by dc bus, power feedback between drive motor and load motor, external electrical network is the consumption of makeup energy only, obvious energy conservation, a large amount of wastes of traditional transmission test method and test unit energy have been avoided, emissions from engines and noise are to the pollution of environment, and the increase of variator cost of development.

Description of drawings:

Fig. 1 is a system construction drawing of the present invention

Fig. 2 is a system circuit diagram of the present invention

Fig. 3 is the control principle figure of system of the present invention

Fig. 4 is intermodule signal transfer principle figure of the present invention

Fig. 5 is driver's principle of simulation figure of the present invention

Fig. 6 is a simulation of engine schematic diagram of the present invention

Fig. 7 is a load simulation schematic diagram of the present invention

Fig. 8 is state of cyclic operation figure of the present invention

Fig. 9 is the speed of a motor vehicle, air throttle and speed ratio figure in the state of cyclic operation test of the present invention

Figure 10 is the transmission efficiency figure in the state of cyclic operation test of the present invention

Figure 11 is fuel consumption and fuel consume spirogram in the state of cyclic operation test of the present invention

Embodiment:

As shown in Figure 1, system of the present invention uses alternating-current variable frequency motor as driving, the work of simulated automotive engine.Utilize two frequency-conversion alternating current motors as load, suffered moment of resistance when simulated automotive travels.Electric Machine Control utilizes frequency converter to carry out.In this pilot system, utilize a power for the American AB B motor of 90KW as driving, the motor model is QABP280M2A, the American AB B motor of two power 75KW is as load, model is QABP280S4A.What frequency converter adopted is Sweden Emotron company, the frequency converter model of controlling and driving motor is VFX-48-210-54CED-01000, the frequency converter model of control load motor is VFX-48-175-54CED-01000, in the process of the test, drive motor is in motoring condition, drives two load motor rotations.Load motor is in the state of generating.

As shown in Figure 2, by terminals DC+ and DC-, utilize common DC bus that three frequency converters are linked to each other, during pilot system work, drive motor is in electric model.Drive motor is by the raising speed case, and variator drives load motor, and at this moment load motor is in power generation mode.The electric weight that load motor sends is got back to drive motor through dc bus, uses employed electric energy when having saved test for drive motor.PC is connected with frequency converter by 232 order wires, and drive motor is carried out rotating speed control, and load motor is carried out moment of torsion control.

As shown in Figure 3, utilize the work and the simulated roadway load of alternating-current variable frequency motor simulated engine during system works.In the test Control Software, stored the part throttle characteristics table of corresponding engine, and stored the corresponding calculation of resistance parameters needed of automobile.When control, drive motor is in the rotating speed control model.By serial communication, the rotating speed of target of engine is sent to frequency converter, reach needed working speed by the Frequency Converter Control drive motor, to realize simulation to engine.The load of load motor simulated roadway is in torque control mode during control.By serial ports required moment of torsion is sent to frequency converter, the moment of torsion that is sent by the Frequency Converter Control motor reaches needed value.Therefore, total system has realized the simulation of running car and the simulation of engine operation, has realized the no exhaust emission in the process of the test, has reached the purpose of environmental protection.The control of total system is by standard cycle operating mode module, driver's analog module, the realization of cooperating jointly of simulation of engine module, load simulation module.

Be illustrated in figure 4 as the signal transitive graph of each intermodule.The result of each module gained transmits according to shown in the figure.The rotating speed of load motor, drive motor moment of torsion are sent to PC after by sensor acquisition, offer needed each module.

The state of cyclic operation module provides target vehicle speed v for pilot model _Desiredv _DesiredCorresponding with the time, can represent:

v _desired＝f(t)(1)

Many state of cyclic operations are made model be stored in the pilot system, can select needed operating mode at the trial, be illustrated in figure 8 as one of them state of cyclic operation.

Be illustrated in figure 5 as driver's principle of simulation figure.Driver's module provides throttle opening α for the simulation of engine module _e, for the load simulation module provides brake-pedal travel β.Under the closed-loop control situation, α _eBe based on that the difference of the actual vehicle speed and the desirable speed of a motor vehicle regulates.It can be made the PI controller of saturation degree restriction.Promptly

$\left\{\begin{array}{c}\mathrm{\Δv}=v_{\mathrm{desired}}-v_{\mathrm{actual}}\\ {\mathrm{\α}}_e=K_{\mathrm{pt}}\mathrm{\Δv}+K_{\mathrm{it}}\∫\mathrm{\Δvdt}\\ 0\≤{\mathrm{\α}}_e\≤{\mathrm{\α}}_{e,\max }\end{array}\right.---\left(2\right)$

v _Desired-desirable speed of a motor vehicle v _Actual-actual vehicle speed

K _Pt-controller proportional COEFFICIENT K _It-controller integral item coefficient

α _e-throttle opening α _{E, max}-maximum throttle opening, 100%

v _ActualCan try to achieve by (4) according to the load motor rotating speed that records

v _actual＝0.377rn(4)

R-radius of wheel n-vehicle wheel rotational speed, i.e. load motor rotating speed

The same with air throttle, brake-pedal travel is based on that the difference of the actual vehicle speed and the desirable speed of a motor vehicle regulates, and is specially:

$\left\{\begin{array}{c}\mathrm{\&Delta;v}=\max \{v_{\mathrm{actual}}-v_{\mathrm{destred}},0\}\\ \mathrm{\&beta;}=K_{\mathrm{pb}}\mathrm{\&Delta;v}+K_{\mathrm{ib}}\&Integral;\mathrm{\&Delta;vdt}+K_{\mathrm{db}}\frac{\mathrm{d\&Delta;v}}{\mathrm{<figure-callout\; id="0"\; label="dt"\; filenames="A20071003544900153.png,A20071003544900161.png"\; state="\{\{state\}\}">dt</figure-callout>}}\\ 0\&le;\mathrm{\&beta;}\&le;1\end{array}\right.---\left(5\right)$

β-brake-pedal travel K _Pb-controller proportional coefficient

K _Ib-controller integral item coefficient K _Db-controller differential term coefficient

The driving rotating speed of simulation of engine model decision drive motor.

Be illustrated in figure 6 as the simulation of engine schematic diagram.The target throttle valve of being calculated the back acquisition by pilot model is delivered to the simulation of engine model.Simultaneously, sensor is passed the drive motor rotating speed back.Part throttle characteristics according to engine has:

T _e＝f(α，n _e)(6)

The torque that is engine can be by engine air throttle aperture and engine speed decision.Obtain engine current target torque T so utilize target throttle valve and current rotating speed to look into the part throttle characteristics table _e

And current time engine actual torque is the moment of torsion that drive motor sends, and is obtained by sensor acquisition.According to formula (7), according to the target torque and the actual torque of engine, the acceleration of calculation engine is quadratured to it, can obtain the rotating speed of target of engine, i.e. the control rotating speed of drive motor:

${\stackrel{\&CenterDot;}{\mathrm{\&omega;}}}_e=(T_e-T_{\mathrm{in}})/I_e---\left(7\right)$

ω _e＝∫ω _edt(8)

T _eThe target operation torque of-engine

T _mThe load torque that-engine is current, the i.e. current moment of torsion of drive motor

I _eThe moment of inertia of-engine

Be illustrated in figure 7 as the load simulation schematic diagram.The load of pilot system is provided by load motor, and load value is calculated according to the vehicle ' situation of current simulation by load module and obtains.Load torque is made up of two parts, the moment of torsion that a part is produced by car resistance, and a part of braking torque, car resistance square are calculated by the current speed of a motor vehicle and obtain, and the speed of a motor vehicle is calculated according to (4) formula.The brake resistance square can calculate according to current brake-pedal travel and obtain.When setting up the car resistance model, utilize automobile to carry out the road coasting test earlier, obtain to calculate the corresponding relation of the car resistance and the speed of a motor vehicle.

Automobile is when straight travels down, and car resistance can be reduced to:

$F_z=A+B{v}_a+C{v}_a^2+\mathrm{\&delta;}\frac{G}{g}\frac{{\mathrm{dv}}_a}{\mathrm{dt}}---\left(9\right)$

The kinetic equation that automobile slides on straight road is:

$-\mathrm{\&delta;}\frac{G}{g}\frac{{\mathrm{dv}}_a}{\mathrm{dt}}={\mathrm{Gf}}_0(1+f_1{v}_a+f_2{v}_a^2)+\frac{C_{D}A{v}_a^2}{21.15}---\left(10\right)$

After the conversion arrangement:

$-\mathrm{\&delta;}\frac{G}{g}\frac{{\mathrm{dv}}_a}{\mathrm{dt}}=A+B{v}_a+C{v}_a^2---\left(11\right)$

In the formula: A=Gf ₀, B=Gf ₀f ₁, C=C _DA/21.15+Gf ₀f ₂

For trying to achieve running drag model coefficient A, B, C can pass through the trap for automobile coasting test, obtains automobile v of coasting test repeatedly on same road surface _a-t data are converted into v again _a-a data, utilize the nonlinear data match to obtain the relation of retarded velocity and speed:

$\frac{{\mathrm{dv}}_a}{\mathrm{dt}}=\mathrm{\&alpha;}+\mathrm{\&beta;}{v}_a+\mathrm{\&lambda;}{v}_a^2---\left(12\right)$

Contrast can be tried to achieve:

$A=\mathrm{\&alpha;}\frac{G}{g}\mathrm{\&delta;}$ $B=\mathrm{\&beta;}\frac{G}{g}\mathrm{\&delta;}$ $C=\mathrm{\&lambda;}\frac{G}{g}\mathrm{\&delta;}---\left(13\right)$

So the car resistance square is:

$T_z=F_{z}r=(A+{\mathrm{Bv}}_a+C{v}_a^2+\mathrm{\&delta;}\frac{G}{g}\frac{{\mathrm{dv}}_a}{\mathrm{dt}})r---\left(14\right)$

Braking moment is:

T _b＝F _brakeβr(15)

Total moment of resistance:

T＝T _b+T _z(16)

Computing machine is sent to frequency converter with the target moment of resistance through serial ports, again by the moment of torsion of Frequency Converter Control motor to needed moment.

In sum, pilot system is by the controlling and driving rotating speed of motor, and the load of control load motor realizes the analog operation of engine in operational process.Utilize this system to realize the reproduction of experimental enviroment, can carry out long run test same operating mode, and pollution-free, save electric energy.

Fig. 9, Figure 10, Figure 11 are test figure chart of the present invention, from these test figure charts, and outstanding substantive distinguishing features of the present invention as can be seen and obvious improvement, and excellent technical feature.

Claims (3)

1. environment-friendly speed transmission test method, it is characterized in that adopting an alternating-current variable frequency motor as drive motor, be in electronicly, the work of engine in the simulation test, drive motor output connect the transmission gear shift device after raising speed, adopt two alternating-current variable frequency motors again, as the load of variator, the simulated roadway load and the moment of resistance, two load motors are in generating, the electric energy that load motor produced is by the shared dc bus of alternating-current variable frequency motor, and feedback is used for drive motor; Meanwhile, PC is connected with the frequency converter of each motor, and drive motor is carried out rotating speed control, and load motor is carried out moment of torsion control.

2. environment-friendly speed transmission test device, it is characterized in that including 1 drive motor and frequency converter thereof, 2 load motors and frequency converter thereof, also include the raising speed case, dc bus, PC, drive motor and load motor are alternating-current variable frequency motor, be subjected to Frequency Converter Control separately, drive motor is in electronic, simulated engine work, drive motor output is by being connected to variator after the raising speed case raising speed, variator output connects two load motors respectively, two load motors are in generating, the electric energy that produces is connected to drive motor by dc bus, for using, meanwhile, PC passes through sensor, data acquisition box is gathered drive motor respectively, variator, the service data of load motor, and PC connects the frequency converter of controlling and driving motor respectively by order wire, the frequency converter of load motor, drive motor is carried out rotating speed control, load motor is carried out moment of torsion control.

3. a kind of environment-friendly speed transmission test method according to claim 1 is characterized in that the PC control system comprises simulation of engine module, driver's analog module, load simulation module, standard cycle operating mode module, engine universal characteristic module.

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