JP2002071520A - Device for testing power transmitting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make generable an expected excitation phenomenon, and to prevent the damage of a power transmitting system or the like due to an unexpected vibration. SOLUTION: A base torque command signal, excitation frequencies, and excitation amplitude are generated from a computer controller 15, a torque command signal is generated from an adder 14, an input side dynamo-meter 10 is driven, and a resonance rate characteristic curve with the base torque command signal and the excitation frequencies as parameters is recorded. Also, a resonance rate is read from the resonance rate curve, and the inverse number and the set excitation amplitude are inputted to a multiplier 16 so that corrected excitation amplitude can be calculated, and the corrected excitation amplitude and the excitation frequencies are added to a function generator 12, and the base torque command is added to an adder 14, and the input side dynamo-meter 10 is driven according to the obtained torque command signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing a power transmission system (power train).

[0002]

2. Description of the Related Art Generally, in a production line of a power transmission system (power train) of an automobile, a performance test is performed to confirm final quality. By the way, one of the main causes of failure of a power transmission system of an automobile is an explosion torque ripple of an engine, and this explosion torque ripple is generated by a subtle variation in a combustion state in each cylinder of the engine. In a dynamometer, it is difficult to control a torque on a small order such as an explosion torque ripple, so that in a test of a blast torque ripple, a power transmission system was driven by an engine. However, in the case of a test of a power transmission system driven by an engine, reproducibility was poor because changes in conditions around the engine affected the test results. Particularly, there is a problem in safety in a long-term durability test, and the test may be interrupted due to an engine failure.

Therefore, a power transmission system testing device having a function of generating a torque ripple simulating an explosion torque ripple without using an engine and capable of performing a test of the explosion torque ripple is disclosed in Utility Model Registration No. 2584924. Proposed by This proposal will be described with reference to FIG. In the figure, reference numeral 1 denotes a power transmission system which is a device 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 the three-phase power supply 5 and controls the driving of the induction motor 2. Inverter 4
In the inverter control unit 6 for controlling the reference signal wave, 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 serving as a carrier. 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.

In the power transmission system test apparatus described above, the reference signal wave is distorted by shifting the amplitude and phase of the reference signal generated from the reference signal wave generation circuit 7 or superimposing a DC component. , Thereby the induction motor 2
A ripple component is generated in the output torque of the power transmission system 1, and various performance tests of the power transmission system 1 are performed using the torque ripple component as a pseudo component of the explosion torque ripple of the engine.

[0005] In the above apparatus, the vibration control for reproducing the explosion vibration of the engine is performed. Similarly, the prior art will be described with reference to FIG. In FIG. 4, an input dynamometer 1 is provided on the input side of a power transmission system 1 to be tested.
0 is connected, and the output side dynamometer 11 is connected to the output side of the power transmission system. Function generator 1
The vibration frequency (explosion vibration frequency, which is determined by the input shaft rotation speed of the power transmission system 1 and the number of engine cylinders to be simulated) and the vibration amplitude set by the vibration amplitude setting unit 13 are input to 2. Then, the excitation torque command signal of this frequency and amplitude is input to the adder 14.

The adder 14 has an input dynamometer 10
, A vibration torque command signal is added to the base torque command signal, and the inverter 4 is controlled as a torque command signal. To generate 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 represented by the relationship between the excitation frequency and the resonance ratio (the ratio between the detected torque of the input dynamometer 10 and the command torque). In some cases, the resonance ratio becomes considerably larger than 1.

[0007]

As described above, in the conventional power transmission system test apparatus, a vibration command is issued in response to a torque control command of the input dynamometer 10 (including the induction motor 2). Although provided as a feedforward element, 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) uses the excitation frequency and the base torque command as parameters. It has mechanical resonance characteristics, and the above-mentioned excitation control circuit does not always obtain the intended excitation amplitude, and cannot avoid the effect of resonance phenomena due to the excitation frequency. May be considerably larger than 1, and the power transmission system 1 and the like may be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can cause an intended vibration phenomenon, and a power transmission system and its driving unit and load can be caused by a resonance phenomenon caused by a vibration frequency. It is an object of the present invention to obtain a power transmission system test device capable of preventing the occurrence of breakage in a part.

[0009]

A power transmission system test apparatus according to the present invention includes a vibration torque command signal generating section for generating a frequency and amplitude variable vibration torque command signal, and a base torque command signal for a drive section. And an excitation torque command signal to generate a torque command signal. The addition section controls the drive section with the torque command signal, and adds the base torque command signal to the addition section. And a characteristic recording unit that records a resonance ratio characteristic curve using the base torque command signal and the excitation frequency as parameters when the drive unit is controlled by the torque command signal obtained by adding the , A base torque command signal setting unit that sets a base torque command signal and adds it to an addition unit and a characteristic recording unit, and calculates a vibration frequency to generate a vibration torque command signal generation unit and a characteristic acquisition unit. The excitation frequency calculation section to be added to the section, the excitation amplitude setting section to set the excitation amplitude, and the reciprocal of the resonance ratio obtained by inputting the base torque command signal and the excitation frequency to the characteristic recording section, and the excitation A multiplication unit is provided for obtaining a corrected vibration amplitude by multiplication with the amplitude and adding the corrected vibration amplitude to the vibration torque command signal generating unit.

[0010]

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. Reference numeral 15 denotes a computer control apparatus that performs control calculations, 16 denotes a multiplier that multiplies a set vibrating amplitude by 1 / resonance ratio, and 17 denotes an input-side dynamometer This is an FFT analyzer that receives a detection torque of the meter 10 and performs frequency analysis. Other configurations are the same as the conventional one.

Next, the operation of the above configuration will be described. When performing the vibration control, the resonance characteristic recording operation is performed in advance in a state where the power transmission system 1, which is the device under test, is set. That is, the base torque command signal, the excitation frequency and the excitation amplitude are variously changed and output from the computer control device 15, and the excitation frequency and the excitation amplitude are input to the function generator 12,
A vibration torque command signal of the vibration frequency and the vibration 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 a vibration torque command signal is added to the base torque command signal, which is 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 to apply rotational vibration to the input-side dynamometer 10. At this time, the torque of the input-side dynamometer 10 is detected and input to the FFT analyzer 17. The FFT analyzer 17 analyzes the frequency 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 between the detected torque and the command torque in the input 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.

Next, during the actual vibration operation, a current base torque command signal from a base torque setter (not shown) and a power transmission system 1 in a vibration frequency calculator (not shown).
The excitation frequency calculated from the input rotation speed and the number of cylinders of the simulation engine is input to the computer controller 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 vibration amplitude and the reciprocal of the resonance ratio set by the vibration amplitude setting unit 13, calculates the corrected vibration amplitude by multiplying the obtained values, and outputs the corrected vibration amplitude to the function generator 12. In the function generator 12, the above-described excitation frequency and the corrected excitation amplitude are input, and an excitation torque command signal of this frequency and amplitude is output to the adder 14, which is added to the base torque command signal to obtain an inverter torque command signal. It is added 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 to generate torque ripple.

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. During the actual excitation operation, the resonance ratio characteristic curve is used. The corrected vibration amplitude is calculated from the reciprocal of the resonance ratio and the vibration amplitude, and the corrected vibration amplitude is added to the function generator 12. At this time, the inverter 4 is controlled by the inverter torque command signal output from the adder 14. By controlling, the input side dynamometer 10 generates torque ripple. Therefore, since the set excitation amplitude is multiplied by the reciprocal of the resonance ratio, the resonance ratio can always be set to 1 at the detection level, and the excitation phenomenon as set can be caused. And the dynamometers 10 and 11 can be prevented from being damaged.

[0014]

As described above, according to the present invention, the corrected excitation amplitude is obtained by multiplying the reciprocal of the resonance ratio by the excitation amplitude.
The corrected vibration amplitude is applied to the vibration torque command signal generator, so that the resonance ratio can always be 1 and the vibration phenomenon as set can be caused. It is possible to prevent the power transmission system drive unit and the load unit from being damaged.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power transmission system test 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 device.

FIG. 4 is a configuration diagram of another conventional device.

[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 control device 16 ... Multiplier 17 ... FFT analyzer

Claims (1)

[Claims] 1. A power transmission system test apparatus for connecting a drive unit to an input side of a power transmission system, connecting a load unit to an output side of the power transmission system, and performing a performance test of the power transmission system. A torque command signal is generated by adding a vibration torque command signal generating section for generating a variable amplitude vibration torque command signal, and a base torque command signal and a vibration torque command signal of a driving section, and driving is performed using the torque command signal. An addition unit that controls the unit, a base torque command signal is added to the addition unit, and a vibration frequency and a vibration amplitude are added to a vibration torque command signal generation unit, and the driving unit is controlled by the torque command signal obtained by the addition. And a characteristic recording section that records the resonance ratio characteristic curve using the base torque command signal and the excitation frequency as parameters, and a base torque command signal that is set and added to the addition section and the characteristic recording section. Source torque command signal setting unit, an excitation frequency calculation unit that calculates the excitation frequency and adds it to the excitation torque command signal generation unit and the characteristic recording unit, an excitation amplitude setting unit that sets the excitation amplitude, and a characteristic recording unit A multiplication unit that obtains a corrected vibration amplitude by multiplying a reciprocal of a resonance ratio obtained by inputting a base torque command signal and a vibration frequency to the vibration amplitude, and adds the corrected vibration amplitude to a vibration torque command signal generation unit. A test device for a power transmission system, characterized in that: