JPH06281537A - Torsion vibration applying device - Google Patents

Abstract

PURPOSE:To perform desired vibration application with high efficiency even when an instructed vibration frequency is low. CONSTITUTION:When a speed instruction value N* is inputted, a corresponding torque instruction value tauM4x is applied to an acceleration/deceleration inverter 13. On the other hand, a deviation between a speed feedback signal N corresponding to a rotation speed of an acceleration/deceleration motor 11 and the speed instruction value N* is detected and the acceleration/deceleration motor 11 is controlled such that the deviation value becomes equal to 0. Since a vibration applying inverter 12 is driven in accordance with a torque instruction value tauG* which is an addition value of a load torque instruction value tauD obtained by simulating a load characteristic and a torque ripple instruction value DELTAtauM* obtained by simulating an engine characteristic, sample 2 receives a torque ripple of the engine from a load side, which was originally an input side, and a torque corresponding to the load characteristic from the load side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional vibration exciter suitable for use in testing a device driven by a prime mover having a torque ripple, such as an automobile transmission.

[0002]

2. Description of the Related Art The rotational torque of a motor (engine etc.) of an automobile is not always constant but has a ripple. Therefore, the transmission connected to the prime mover is driven by the drive source having the torque ripple. Therefore, when testing a transmission, even if it is driven by a motor that rotates at a constant torque,
The situation is different from when it was connected to the engine, so I have not tested it. Therefore, when testing the transmission (testing noise, etc.), the transmission T was directly connected to the engine E. That is, there is a problem that the transmission cannot be tested until after the engine has been developed, and the total development time of an automobile or the like takes a very long time.

Further, when an automatic driving test is carried out using an engine, there is a danger that a fire may occur due to heat generation of the engine. The configuration in this case is shown in FIG. A load L simulating an actual machine is connected to the output shaft of the transmission T. The load L simulates an inertial load and running resistance corresponding to the body of the automobile. The inertia equivalent to the vehicle body has a great influence on acceleration / deceleration, and the running resistance corresponds to a steady output.

Therefore, a torsional vibration device has been developed in which the motor is driven so as to have a torque ripple by controlling the inverter, and thereby the rotation of the engine is simulated.

FIG. 3 is a block diagram showing a conventional structure of a torsional vibration device using an inverter. In the figure,
Reference numeral 2 denotes a test piece (transmission in this example), the input shaft of which is connected to the rotary shaft of the induction motor 3, and the output shaft of which is connected to the load 1. The load 1 simulates a device connected to the latter stage of the test piece, and is configured by a simple inertial load, some braking device, or a combination thereof. In this case, in order to simulate the vehicle body's equivalent inertia and running resistance, for example,
A generator is used. Reference numeral 4 is an inverter that supplies a drive current to the motor 3, and the inverter 4 and the motor 3 are
It becomes the drive source that simulates the engine in the actual machine. The inverter 4 supplies a drive current (three-phase alternating current) corresponding to the torque command value τ _N * to the motor 3.

A control unit 9 is composed of a deviation detection point 5, a speed amplifier 7 and an addition point 8, and has a speed command value N.
Depending on * (constant value or gradually changing DC signal) and torque ripple command value Δτ _r * (AC signal),
Create a torque command value τ _N *. At the deviation detection point 5, the deviation between the speed command value N * and the speed feedback value (instantaneous value) N of the motor 3 is taken, this deviation is amplified by the speed amplifier 7 by a predetermined coefficient, and the torque signal τ _N * Becomes At the addition point, the torque ripple command value Δτr * and the torque signal τ _N * are added and output as a torque command value τ _N *. In the above configuration, the speed control loop operates so that the deviation at the deviation detection point 5 becomes 0, and the torque ripple command value Δτ is superimposed on the operation of the speed control loop.
_r * (AC signal) is added. Therefore, the motor 3
Maintains the speed according to the speed command value N *, and generates a torque ripple according to the torque ripple command value Δτ _r *.

[0007]

By the way, in the above-mentioned torsional vibration exciter, since the motor 3 vibrates the specimen, and also accelerates and decelerates itself, the specimen is actually vibrated. If the inertia of the motor 3 is J _M and the inertia of the test piece is J _L , the torque that can be used for the above is reduced to J _L / (J _M + J _L ) times the generated excitation torque. Therefore, it is necessary to reduce the inertia of the motor 3 in order to efficiently apply the vibration torque to the test piece. That is, it is desirable to use a lightweight motor 3. However, when a lightweight motor is used, the output becomes small and the load cannot be speed-controlled sufficiently. Also, when testing the transmission noise against changes in rotation, the same speed changes as those of the actual engine must be applied. In this case, the speed ratio from engine idling to high speed rotation is about 1: 6. Then, when the engine is rotating at a low speed, the frequency of the speed ripple is also low and is about 10 Hz to 30 Hz. However, the low torque ripple command value .DELTA..tau _r * frequencies are vibration command, the speed amplifier 7 ends up response, the speed control loop torque ripple command value .DELTA..tau _r
There was a drawback that it absorbed the speed change accompanying the fluctuation of * and created a ripple-free state. That is,
If the frequency of the vibration command is low, there is a problem that desired vibration cannot be performed. The present invention has been made in view of the above-described circumstances, and it is possible to perform desired vibration even when the frequency of the vibration command is low, and moreover, it is possible to reduce the size of the vibration motor and efficiently perform vibration. It is an object of the present invention to provide a torsional vibration device that can perform

[0008]

In order to solve the above-mentioned problems, in the invention as set forth in claim 1, in a torsional vibration device for applying vibration while controlling the rotational speed of the sample, the sample is An acceleration / deceleration motor connected to the input side, an excitation motor connected to the load side of the sample, and an acceleration / deceleration inverter supplying a drive current corresponding to the supplied torque command value to the acceleration / deceleration motor. , A deviation between a vibration inverter that supplies a driving current corresponding to the supplied torque command value to the vibration motor and a feedback signal corresponding to the rotation speed of the acceleration / deceleration motor, and a speed command value, and the deviation is detected. Is supplied to the acceleration / deceleration inverter, and a torque command value corresponding to the torque ripple of the drive source to be simulated is supplied to the vibration invertor. ; And a torque ripple control means for supplying performs acceleration and deceleration of the specimen by the acceleration and deceleration motor, characterized in providing a torque ripple to the specimen by the vibration motor. In the invention according to claim 2, the torque ripple control means calculates a load torque according to a change in the rotation speed of the acceleration / deceleration motor, and adds the calculation result and the torque ripple command value. It is characterized in that it is supplied to the vibration inverter. According to a third aspect of the present invention, the torque ripple control means according to the first aspect calculates a load torque according to a change in the rotation speed of the acceleration / deceleration motor, and the calculation result indicates the acceleration / deceleration motor. The load torque not depending on the rotation speed is added, the torque ripple command value is added to the added value, and the addition result is supplied to the vibration inverter.

[0009]

The acceleration / deceleration motor performs acceleration / deceleration from the input side of the sample, the vibration motor gives torque ripple from the load side of the sample, and the speed control loop for the acceleration / deceleration motor provides torque ripple. Separated from control, the operation of the speed control loop and the control of torque ripple do not interfere. Further, in the inventions of claims 2 and 3, the vibration motor also serves to simulate the load characteristics.

[0010]

【Example】

A: Configuration of Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In the figure, reference numeral 10 denotes a vibration motor for vibrating, the rotary shaft of which is connected to the load side of the test piece 2. That is, the vibration in this embodiment is performed from the load side of the sample 2. Further, 11 is an acceleration / deceleration motor for performing speed control, and its rotation shaft is connected to the input side of the sample 2. As described above, in this embodiment, the motor for accelerating and decelerating is separated from the motor for oscillating, accelerating and decelerating from the input side of the sample 2, and oscillating from the load side.

Next, 12 is an oscillating inverter for supplying a drive current to the oscillating motor 10, and 13 is the accelerating / decelerating motor 1.
1 is an acceleration / deceleration inverter that supplies a drive current to the drive unit 1. These inverters have drive currents (3
Phase alternating current) is output.

Reference numeral 15 denotes a torque command value calculator, which is a torque command value τ _M * for controlling the acceleration / deceleration inverter 13.
And a load torque command value τ _D * and a torque ripple command value Δτ _M * for controlling the vibration inverter 12.
Here, the load torque command value τ _D * is a torque command value for causing the vibration motor 10 to simulate the load of the actual machine, and a value corresponding to the load to be realized is output. In addition, when testing the noise generated by the transmission, the test may be performed without connecting a load. To cope with such a situation, the load torque command value τ _D
* Is 0.

Next, FIG. 2 is a block diagram showing the configuration of the torque command value calculator 15. In the figure, 20 is a deviation detection point for detecting the deviation between the rotation speed feedback signal N of the acceleration / deceleration motor 11 and the speed command value N *, and the deviation obtained here is amplified by the speed amplifier 21 to generate a torque command. It is output as the value τ _M *. Here, the deviation detection point 20, the speed amplifier 21, the acceleration / deceleration inverter 13, and the acceleration / deceleration motor 11 constitute a speed control loop,
This speed control loop operates so that the deviation obtained at the deviation detection point 20 becomes zero.

Next, reference numeral 22 denotes an arithmetic unit for simulating a portion of the load characteristic which changes according to the speed. The arithmetic operation is performed by using the speed command value N * as an input signal to calculate the torque command value τ.
Generate _L Δ _N *. Torque command value τ in this embodiment
_L Δ _N * simulates the acceleration / deceleration characteristics due to the inertia of the vehicle. Note that the computing unit 22 uses the feedback signal N
The calculation may be performed based on (see the broken line in FIG. 2). 23, torque command value τ _L Δ _N * and the torque command value tau
It is an adder that adds _LR * and outputs the addition result as a load torque command value τ _D *. The torque command value τ _LR * is a constant that does not depend on the speed of the acceleration / deceleration motor 11, and corresponds to running resistance in this embodiment.

Further, the torque ripple command value Δτ _M * is
A waveform corresponding to the torque ripple command value to be simulated is prepared in advance. As described above, the torque ripple command value Δτ _M * and the load torque command value τ _D * output from the torque command value calculator 15 are added to the adder 25.
Is added and supplied as a torque command value τ _G * to the vibration inverter 12.

B: Operation of Embodiment Next, the operation of this embodiment having the above-mentioned configuration will be described. When the speed command value N * is given, the torque command value τ _M * corresponding thereto is output from the speed amplifier 21 and added to the acceleration / deceleration inverter 13. On the other hand, the acceleration / deceleration motor 1
The speed feedback signal N corresponding to the rotation speed of 1 is applied to the deviation detection point 20 and the deviation from the speed command value N * is detected. Then, the above-mentioned loop includes the deviation detection point 20.
Of the acceleration / deceleration motor 1 because it operates so that the deviation of
The rotation speed of 1 corresponds to the speed command value N *.

The vibration inverter 12 is driven by the torque command value τ _G * which is the sum of the load torque command value τ _D simulating the load characteristics and the torque ripple command value Δτ _M * simulating the engine characteristics. Is done,
The test piece 2 receives the torque ripple of the engine originally received from the input side from the load side, and further receives the torque corresponding to the load characteristic from the load side. In this case, the same applies to the test piece 2 from the input side and the load side as long as the torque ripple is given.

In the above operation, the speed control loop is
Not affected by the torque ripple command value Δτ _M *. Therefore, even if the frequency of the torque ripple command value Δτ _M * is low, the torque ripple command value Δτ _M * does not follow the operation and does not absorb the value. In addition, the acceleration / deceleration motor 1
No. 1 does not vibrate, so its inertia may be large. Therefore, a large motor can be used, and the speed of the test piece 2 can be sufficiently controlled.
On the contrary, since the vibration motor 10 does not perform speed control but only applies a vibration torque and a load torque, a small motor can be used and its inertia can be sufficiently reduced.

The influence of the inertia of the vibration motor on the vibration will be described. Now, the excitation torque generated by the excitation motor, that is, the excitation torque command value Δ in the embodiment.
_Assuming that the torque corresponding to τ _M * is τ * (t) and the vibration torque received by the sample is τ (t), the following relationships are substantially established.

[0021]

[Formula 1] τ * (t) = K · τ (t)

Here, K is a constant of 1 or more, and the smaller the value, the better the vibration efficiency. That is, the closer the value of K is to 1, the more effectively the vibration torque supplied to the sample is used for the vibration of the sample. This K
Is determined by the moment of inertia of the vibration motor and the moment of inertia of the load. Then, let the moment of inertia of the load be J
Let _{L be} the moment of inertia of the vibration motor, J _M
(T) is expressed as follows.

[0023]

[Formula 2] τ (t) = (1 / K) · τ * (t) = (J _L / (J _M + J _L )) · τ * (t)

As is clear from the above "Formula 2", according to the present embodiment, the value of J _M can be made sufficiently smaller than J _L , so that the exciting torque can be effectively used. it can.

C: Modification In the above embodiment, the case where the test piece 2 is a transmission is taken as an example, but the present invention is not limited to the transmission, but can be applied to all test pieces that require vibration. it can.

[0026]

As described above, according to the present invention, desired vibration can be performed even when the frequency of the vibration command is low, and the acceleration / deceleration motor is large and the vibration motor is small. Therefore, it is possible to perform efficient vibration while performing sufficient speed control.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a torque command value calculator 1 in the configuration of the embodiment.
5 is a block diagram showing the configuration of FIG.

FIG. 3 is a block diagram showing a configuration of a conventional device.

FIG. 4 is a block diagram showing a configuration when a test is performed using an engine.

[Explanation of symbols]

2 Specimen 10 Vibration motor 11 Acceleration / deceleration motor 12 Vibration inverter 13 Acceleration / deceleration inverter 15 Torque command value calculator (speed control means; torque ripple control means)

Claims (3)

[Claims] 1. A torsional oscillating device for applying vibration while controlling the number of revolutions of a sample, an acceleration / deceleration motor connected to an input side of the sample, and a load side of the sample. Excitation motor, an acceleration / deceleration inverter that supplies the drive current corresponding to the supplied torque command value to the acceleration / deceleration motor, and an excitation motor that supplies the drive current corresponding to the supplied torque command value to the excitation motor. An inverter, and speed control means for detecting a deviation between a feedback signal corresponding to the rotation speed of the acceleration / deceleration motor and a speed command value, and supplying a torque command value that minimizes the deviation to the acceleration / deceleration inverter, And a torque ripple control means for supplying a torque command value corresponding to the torque ripple of the drive source to be simulated to the vibration inverter, A torsional oscillating device, characterized in that the specimen is accelerated and decelerated and a torque ripple is given to the specimen by the oscillating motor. 2. The torque ripple control means calculates a load torque according to a change in the rotational speed of the acceleration / deceleration motor,
The torsional vibration exciter according to claim 1, wherein the calculation result and the torque ripple command value are added and supplied to the vibration inverter. 3. The torque ripple control means calculates a load torque according to a change in rotation speed of the acceleration / deceleration motor, and adds a load torque that does not depend on the rotation speed of the acceleration / deceleration motor to the calculation result. The torsional vibration exciter according to claim 1, further comprising: adding the torque ripple command value to the added value, and supplying the addition result to the vibration inverter.