JP4016582B2 - Power transmission system test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power transmission system (powertrain) testing apparatus.
[0002]
[Prior art]
Generally, a performance test is performed on a production line of a power transmission system (power train) of an automobile for final quality confirmation. By the way, one of the main causes of failure of the power transmission system of an automobile is an engine explosion torque ripple, and this explosion torque ripple is generated by a subtle variation in the combustion state in each cylinder of the engine. In a dynamometer, it is difficult to control the torque of minute orders such as explosion torque ripple, so the power transmission system was driven by the engine in the blast torque ripple test. However, in the case of a power transmission system test driven by an engine, a change in conditions around the engine affects the test result, so the reproducibility was poor. In particular, a long-term durability test has a safety problem, and the test may be interrupted due to an engine failure.
[0003]
Therefore, a utility model registration No. 2584924 has proposed a power transmission system testing device that has a function of generating a torque ripple that simulates an explosion torque ripple without using an engine, and that can test the explosion torque ripple. It was. This proposal will be described with reference to FIG. In the figure, reference numeral 1 denotes a power transmission system that is a machine under test. The power transmission system 1 is driven by an induction motor 2, and its output is absorbed by a load unit 3. The inverter 4 is connected to a three-phase power source 5 and drives and controls the induction motor 2. In the inverter control unit 6 that controls the inverter 4, the reference signal wave generation circuit 7 generates a three-phase reference signal wave, and the triangular wave generation circuit 8 generates a triangular wave as a carrier wave. The PWM modulation circuit 9 PWM-modulates the reference signal wave based on the triangular wave, and generates a control pulse signal for the main circuit of the inverter 6.
[0004]
In the power transmission system testing apparatus described above, the reference signal wave generated from the reference signal wave generating circuit 7 is shifted in amplitude and phase, or a direct current component is superimposed to cause distortion in the reference signal wave. A ripple component is generated in the output torque of the induction motor 2, and various performance tests of the power transmission system 1 are performed using this torque ripple component as a pseudo component of the engine explosion torque ripple.
[0005]
In the above apparatus, vibration control is performed to reproduce the explosion vibration of the engine. Similarly, the prior art will be described with reference to FIG. In FIG. 4, an input dynamometer 10 is connected to the input side of the power transmission system 1 to be tested, and an output dynamometer 11 is connected to the output side of the power transmission system. The function generator 12 has an excitation frequency (determined by the explosion vibration frequency, the input shaft speed of the power transmission system 1 and the number of engine cylinders to be simulated) and the excitation amplitude set by the excitation amplitude setting unit 13. And an excitation torque command signal having this frequency and amplitude are input to the adder 14.
[0006]
A base torque command signal that is a torque command signal of the input-side dynamometer 10 is also input to the adder 14, and the excitation torque command signal is added to the base torque command signal, and the inverter 4 is controlled as a torque command signal. In response, the inverter 4 drives the input-side dynamometer 10 and generates torque ripple in the input-side dynamometer 10. The resonance ratio characteristic curve in this case is as shown in FIG. 4, and the resonance ratio characteristic curve is shown by the relationship between the excitation frequency and the resonance ratio (the ratio of the detected torque of the input-side dynamometer 10 to the command torque). In some cases, the resonance ratio is considerably larger than 1.
[0007]
[Problems to be solved by the invention]
As described above, in the conventional power transmission system testing device, the excitation command is given as a feedforward element to the torque control command of the input-side dynamometer 10 (including the induction motor 2). An actual system including the input-side dynamometer 10, the power transmission system 1, and the output-side dynamometer 11 (including the load unit 3) has mechanical resonance characteristics using the excitation frequency and the base torque command as parameters. Therefore, the above-described excitation control circuit does not always obtain the intended excitation amplitude, and the influence of the resonance phenomenon due to the excitation frequency cannot be avoided, and the resonance ratio may be considerably larger than 1. There was also a risk of damage to the power transmission system 1 and the like.
[0008]
The present invention has been made to solve the above-described problems, can cause an intended vibration phenomenon, and damages the power transmission system and its drive and load sections due to a resonance phenomenon caused by the vibration frequency. An object of the present invention is to obtain a power transmission system test apparatus capable of preventing the occurrence of the above-mentioned.
[0009]
[Means for Solving the Problems]
The power transmission system testing apparatus according to the present invention is a means for outputting a base torque command signal, an excitation frequency, and an excitation amplitude of the drive unit in various ways, and an excitation frequency and an excitation amplitude among them are input. The torque command signal is generated by adding the excitation torque command signal having the excitation frequency and the excitation amplitude, and the excitation torque command signal and the base torque command signal, and driving the torque command signal. A means for generating rotational vibrations in the drive unit, a torque detection unit for detecting the torque of the drive unit at this time, a frequency analysis unit for receiving a detected torque from the torque detection unit and performing frequency analysis; The analysis result from the frequency analysis unit is input, the resonance ratio change using the base torque and the excitation frequency as parameters, that is, the means for creating and storing the characteristic curve of the resonance ratio in advance, and during the excitation operation The means for obtaining the resonance ratio from the set base torque command signal, the calculated excitation frequency, and the resonance ratio characteristic curve recorded in advance, and the set excitation amplitude and the inverse of the resonance ratio are input and corrected by multiplication. Means for obtaining a vibration amplitude, means for inputting the calculated vibration frequency and corrected vibration amplitude, outputting a vibration torque command signal of this frequency and amplitude, and a base torque command set with the vibration torque command signal And a means for giving a torque command signal obtained by adding the signals to the drive unit to generate rotational vibration in the drive unit .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a power transmission system test apparatus according to this embodiment, 15 is a computer control apparatus that performs control calculation, 16 is a multiplier that multiplies a set vibration amplitude and 1 / resonance ratio, and 17 is an input-side dynamo. This is an FFT analyzer that receives the detected torque of the meter 10 and performs frequency analysis. Other configurations are the same as those of the prior art.
[0011]
Next, the operation of the above configuration will be described. When the vibration control is performed, the resonance characteristic recording operation is performed in advance with the power transmission system 1 being the device under test being set. That is, the base torque command signal, the vibration frequency and the vibration amplitude are output from the computer controller 15 with various changes, and the function generator 12 receives the vibration frequency and the vibration amplitude. An excitation torque command signal having a frequency and an excitation amplitude is input to the adder 14. A base torque command signal, which is a basic torque command signal of the input-side dynamometer 10, is also input to the adder 14, and the excitation torque command signal is added to the base torque command signal and input to the inverter 4 as an inverter torque command signal. Is done. In response to this, the inverter 4 drives the input-side dynamometer 10 and applies rotational vibration to the input-side dynamometer 10. The torque of the input side dynamometer 10 at this time is detected and input to the FFT analyzer 17, which performs frequency analysis and inputs the result to the computer control device 15. Thus, the characteristic recording operation is performed, and the computer controller 15 changes the resonance ratio (the ratio of the detected torque and the command torque in the input-side dynamometer 10) using the base torque and the excitation frequency as parameters as shown in FIG. That is, a resonance ratio characteristic curve is created and stored.
[0012]
Next, during actual excitation operation, the current base torque command signal from a base torque setter (not shown), and the excitation frequency calculation unit (not shown) are calculated from the input rotation speed of the power transmission system 1 and the number of cylinders of the simulation engine. The excitation frequency is input to the computer control device 15, the resonance ratio is obtained from the resonance ratio characteristic curve recorded in advance, and the reciprocal thereof is output to the multiplier 16. The multiplier 16 receives the excitation amplitude set by the excitation amplitude setting unit 13 and the reciprocal of the resonance ratio, obtains a corrected excitation amplitude by performing multiplication, and outputs it to the function generator 12. The function generator 12 receives the above-described excitation frequency and corrected excitation amplitude, and an excitation torque command signal having this frequency and amplitude is output to the adder 14 and added to the base torque command signal to be used as an inverter torque command signal. Applied to the inverter 4. In response to this, the inverter 4 drives the input-side dynamometer 10 to generate rotational vibration in the input-side dynamometer 10 and generate torque ripple.
[0013]
In the above-described embodiment, the resonance characteristic recording operation is performed in advance to obtain the resonance ratio characteristic curve using the base torque and the excitation frequency as parameters, and the resonance ratio is obtained from this resonance ratio characteristic curve during actual excitation operation. Then, a corrected excitation amplitude is obtained from the reciprocal of the resonance ratio and the excitation amplitude, and this corrected excitation amplitude is added to the function generator 12, and at this time, the inverter 4 is controlled by the inverter torque command signal output from the adder 14, Torque ripple is generated in the input-side dynamometer 10. Therefore, since the set excitation amplitude is multiplied by the reciprocal of the resonance ratio, the resonance ratio can always be 1 at the detection level, the excitation phenomenon as set can be caused, and the power transmission system 1 caused by unexpected vibration. In addition, the dynamometers 10 and 11 can be prevented from being damaged.
[0014]
【The invention's effect】
As described above, according to the present invention, the corrected excitation amplitude is obtained by multiplying the reciprocal of the resonance ratio and the excitation amplitude, and this corrected excitation amplitude is added to the excitation torque command signal generator. The ratio can always be 1, so that an excitation phenomenon as set can be caused, and it is possible to prevent the power transmission system drive unit and the load unit from being damaged by a resonance phenomenon caused by the excitation frequency.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a power transmission system testing apparatus according to the present invention;
FIG. 2 is a resonance ratio characteristic curve according to the present invention.
FIG. 3 is a configuration diagram of a conventional apparatus.
FIG. 4 is a configuration diagram of another conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Power transmission system 4 ... Inverter 10 ... Input side dynamometer 11 ... Output side dynamometer 12 ... Function generator 13 ... Excitation amplitude setting device 14 ... Adder 15 ... Computer controller 16 ... Multiplier 17 ... FFT analyzer

Claims (1)

In a power transmission system testing device for connecting a drive unit to the input side of the power transmission system and connecting a load unit to the output side of the power transmission system to test the performance of the power transmission system, the base torque command signal of the drive unit , Means for outputting the vibration frequency and the vibration amplitude with various changes, means for inputting the vibration frequency and vibration amplitude, and outputting a vibration torque command signal of the vibration frequency and vibration amplitude And a means for adding the excitation torque command signal and the base torque command signal to create a torque command signal, supplying the torque command signal to the drive unit to generate rotational vibration in the drive unit, and driving at this time Torque detection means for detecting the torque of the part, a frequency analysis part for receiving the detected torque from the torque detection means, and an analysis result from the frequency analysis part being inputted, a base torque and an excitation frequency Resonance ratio change using as a parameter, that is, a means to create and store a resonance ratio characteristic curve in advance, a base torque command signal set during excitation operation, a calculated excitation frequency, and a resonance ratio recorded in advance A means for obtaining the resonance ratio from the characteristic curve, a means for obtaining the set excitation amplitude and the reciprocal of the resonance ratio and inputting the corrected excitation amplitude by multiplication, and the calculated excitation frequency and the corrected excitation amplitude are input. The torque command signal obtained by adding the excitation torque command signal having the frequency and amplitude and the excitation torque command signal and the set base torque command signal is supplied to the drive unit. A power transmission system testing device comprising: means for generating rotational vibration .

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