JP5024127B2 - Noise measuring device and noise measuring method - Google Patents

Description

  The present invention relates to a measuring apparatus and a measuring method for measuring noise generated from various parts of a specimen having two rotating electric machines and a plurality of input / output rotating shafts such as an HV transaxle. More specifically, the present invention relates to a noise measuring device and a noise measuring method that can individually measure noises generated from each of two rotating electric machines.

  An HV transaxle used in a hybrid vehicle has two motor generators (hereinafter referred to as MG) and a differential, which are connected via various gears. The two MGs are rotated by receiving a driving force from the engine, and rotate output shafts connected to both wheels via various gears and differentials. Hereinafter, the MG on the side to which the input shaft from the engine is connected and which mainly functions as a generator is referred to as MG1. Also, the MG on the side where the output shafts to both wheels are connected via various gears and differentials and which mainly functions as a motor is called MG2. The various gears include a composite planetary gear in which two planetary gear ring gears are integrated. The rotation shaft of MG1 is connected to the sun gear of the Fr planetary gear, and the rotation shaft of MG2 is connected to the sun gear of the Rr planetary gear. Has been.

  When measuring noise such as motor noise and gear noise, it is desirable to measure each noise source as individually as possible. However, since noise is generally measured by collecting sound with a microphone, it is difficult to extract noise generated from a measurement target part separately from drive sound other than the measurement part and noise from the measurement apparatus itself. On the other hand, as a measurement method for gear noise, a measurement method for obtaining background noise using a dummy specimen (see Patent Document 1), and a measurement method for reducing motor noise of a cooling device (see Patent Document 2). Etc. have been proposed.

The conventional noise measurement method for the HV transaxle was as follows. First, the three axes of the input shaft from the engine of the HV transaxle to be measured and the output shaft to both wheels are connected to each axis of the three-axis bench. And when measuring the noise of MG1, the output shaft to both wheels is stopped from the bench side, and torque is generated in MG1 while MG2 is stopped. Further, when measuring the noise of MG2, torque was generated in MG2 and the input shaft from the engine was made free.
JP 2004-101400 A JP 2006-23244 A

  However, in the conventional noise measurement method described above, it is not easy to increase the noise measurement accuracy by MG2. The reason is that if torque is generated in MG2 for noise measurement of MG2, the rotation of MG1 occurs via the composite planetary gear. In addition, the speed ratio between the sun gear and the carrier at this time is in an unstable state, and the amount of noise superimposed by MG1 changes with each measurement. Therefore, there has been a problem that it is difficult to accurately determine the noise due to MG2.

  The present invention has been made to solve the problems of the conventional noise measurement method described above. That is, the problem is to provide a noise measuring device and a noise measuring method capable of increasing the noise measurement accuracy by MG2 with simple control.

  The noise measuring device of the present invention made for the purpose of solving this problem has first and second rotating electric machines, first and second input / output rotating shafts, and includes the first rotating electric machine and the first rotating electric machine. The three rotation speeds of the input / output rotation shaft and the second input / output rotation shaft are in a primary coupling relationship, and the two rotation speeds of the second rotating electrical machine and the second input / output rotation shaft are Is a noise measuring device for measuring the acoustic noise during rotation of the specimens connected by gears so that is proportional to each other, and the rotation for individually operating the rotational speeds of the first and second input / output rotary shafts A speed operation unit; a control unit that controls the rotation speed operation unit; and a noise acquisition unit that acquires acoustic noise of the specimen. The control unit is configured to output the first and second inputs and outputs by the rotation speed operation unit. Set the rotation axis to the rotation speed ratio at which the first rotating electrical machine does not rotate. Rotate, and performs measurement of the first mode of obtaining the acoustic noise of the specimen by the noise acquisition unit in this state.

  According to the noise measuring apparatus of the present invention, since the rotational speeds of the first and second input / output rotational shafts are individually operated by the rotational speed operation unit, the first and second input / output rotational shafts are connected to the first input / output rotational shafts. The rotating electrical machine can be rotated at a rotation speed ratio that does not rotate. That is, the first and second input / output rotation shafts can be rotated so as to cancel the rotation of the first rotating electrical machine when the second rotating electrical machine is rotated. Therefore, it is possible to acquire noise generated from the second rotating electrical machine when the first rotating electrical machine is not rotating. Thereby, the measurement accuracy of noise by the second rotating electrical machine can be increased with simple control. The acoustic noise in the present invention means noise or vibration. Further, the rotational speed ratio in the present invention includes the relationship between the sign, that is, the direction of rotation.

It is desirable that the control unit acquires the acoustic noise of the specimen by the noise acquisition unit during acceleration and deceleration.
If this is the case, it is possible to acquire acoustic noise during acceleration and deceleration that is particularly likely to generate noise.

The control unit rotates the first input / output rotation shaft by the rotation speed operation unit and stops the second input / output rotation shaft, and in this state, acquires the acoustic noise of the specimen by the noise acquisition unit. It is desirable to make measurements.
In this way, it is possible to acquire acoustic noise generated from the first rotating electrical machine while the second rotating electrical machine is not rotating.

The test object has two second input / output rotary shafts, which are coupled to the second rotating electrical machine via a differential, and the rotational speed operation unit has two second input / output rotary shafts. It is desirable to always match the rotation speeds.
In this way, acoustic noise can be measured in a state where the noise generated from the differential is further reduced.

The control unit has a first speed command signal for instructing the rotation speed operation unit to rotate the first input / output rotation shaft at a rotation speed obtained by multiplying the reference rotation speed by a gain, and a second gain for the reference rotation speed. A speed command control unit for outputting a second speed command signal for instructing the rotation speed operation unit to rotate the second input / output rotation shaft at the applied rotation speed, and a speed command for the measurement in the first mode. The ratio between the first gain and the second gain in the control unit is set equal to the gear ratio of the first and second input / output rotating shafts when the first rotating electrical machine is stopped by the specimen. It is desirable to have a gain setting unit.
When the first and second input / output rotary shafts are rotated at a rotational speed ratio equal to the gear ratio of the first and second input / output rotary shafts when the first rotating electrical machine is stopped by the specimen, The second rotating electrical machine can be rotated with the first rotating electrical machine stopped.

It is desirable that the second rotating electrical machine has an operation unit that generates torque, and the control unit performs the measurement in the first mode while the operation unit generates torque in the second rotating electrical machine.
In this way, acoustic noise at the time of torque generation can be measured. Note that it is desirable that the operating unit also generate torque in the first rotating electrical machine.

  The present invention also includes first and second rotating electric machines, first and second input / output rotating shafts, and the first rotating electric machine, the first input / output rotating shaft, and the second input / output shaft. The rotation speeds of the three parties with the rotation shaft are in a primary connection relationship, and the two rotation speeds of the second rotating electrical machine and the second input / output rotation shaft are coupled with each other in a proportional relationship. This is a noise measurement method for measuring acoustic noise during rotation of a test specimen, wherein the first and second input / output rotary shafts are rotated at a rotational speed ratio at which the first rotating electrical machine does not rotate, and the state It extends to the noise measurement method which acquires the acoustic noise of the specimen.

  According to the noise measuring apparatus and the noise measuring method of the present invention, it is possible to increase the noise measurement accuracy by the MG2 by simple control.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode for embodying the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to a measuring apparatus that measures noise of an HV transaxle.

  As shown in FIG. 1, the noise measuring apparatus 1 of this embodiment is used with a specimen 10 attached thereto. A portion surrounded by a thick line in the figure is the specimen 10. First, the specimen 10 which is the measurement target of this embodiment will be described. The specimen 10 of this embodiment is an HV transaxle mounted on an HV vehicle.

  As shown in FIG. 2, the specimen 10 that is the measurement target of this embodiment has two MGs (MG1, MG2) and a differential 13. Further, they are coupled to each other via a composite planetary gear 14 and a counter driven gear 15. MG1 is an MG that mainly functions as a generator, and MG2 is an MG that mainly functions as a motor. Further, an engine shaft 16 that receives driving from the engine in a state where the specimen 10 is mounted on an automobile is disposed at a position coaxial with the rotation shafts 11a and 12a of the rotors of the MG1 and MG2. The left and right shafts of the differential 13 are the left and right drive shaft shafts 17 and 18 coupled to the left and right axles.

  A range indicated by a solid line in FIG. The rotating shaft 11a of MG1, the rotating shaft 12a of MG2, and the engine shaft 16 are coupled via a composite planetary gear 14. The compound planetary gear 14 has two sets of planetary gear mechanisms, that is, an MG1 side Fr planetary gear 14A and an MG2 side Rr planetary gear 14B. Of these, the ring gear 14A1 and the Rr planetary gear 14B of the Fr planetary gear 14A are included. The ring gear 14B1 is integrally formed.

  That is, the composite planetary gear 14 has a large ring gear 14D. The ring gears 14A1 and 14B1 are both formed on the inner surface side of the large ring gear 14D. A counter drive gear 14C is formed on the outer surface side of the large ring gear 14D. The counter drive gear 14 </ b> C meshes with the counter driven gear 15. Thus, the large ring gear 14 </ b> D and the differential 13 are coupled via the counter driven gear 15.

  The relationship of these gears is simplified and shown in FIG. The Fr planetary gear 14A is a combination of a ring gear 14A1, a carrier 14A2, and a sun gear 14A3. The Rr planetary gear 14B is a combination of a ring gear 14B1, a carrier 14B2, and a sun gear 14B3. The carrier 14A2 of the Fr planetary gear 14A is connected to the engine shaft 16, and the sun gear 14A3 is also connected to the rotating shaft 11a of the MG1.

  Further, the rotating shaft 12a of the MG2 is connected to the sun gear 14B3 of the Rr planetary gear 14B. The carrier 14B2 of the Rr planetary gear 14B is fixed. As a result, the counter driven gear 15 and the MG 2 have the same relationship as if they were simply connected by a gear. MG1 corresponds to the first rotating electrical machine, MG2 corresponds to the second rotating electrical machine, the engine shaft 16 corresponds to the first input / output rotating shaft, and the drive shaft shafts 17 and 18 correspond to the second input / output rotating shaft.

  Since these are coupled, the relationship between the rotational speeds of the rotating shaft 11a of the MG1, the engine shaft 16, and the left and right drive shaft shafts 17 and 18 is a primary coupling relationship. That is, one of the three rotation speeds can be expressed by a linear expression using the other two rotation speeds. Here, it is assumed that the rotational speeds of the drive shaft shafts 17 and 18 are equal for reasons described later. Further, the relationship between the rotational speeds of the rotating shaft 12a of the MG 2 and the counter driven gear 15 is a proportional relationship. Therefore, the relationship between the rotational speeds of the left and right drive shaft shafts 17 and 18 and the rotation shaft 12a of MG2 is also proportional. That is, it is a constant multiple. Note that the coefficients of these relationships differ for each type of specimen 10.

  As shown in FIG. 1, the noise measurement device 1 of this embodiment includes an operation measurement panel 20, a battery simulator 21, a torque command control device 22, an inverter 23, a microphone 24, and an FFT device 25. Further, the specimen 10 is arranged and has a three-axis bench 30 for controlling the rotation of each axis. The three-axis bench 30 has three axes: an INPUT shaft 31, a left OUTPUT shaft 32, and a right OUTPUT shaft 33.

  At the time of measurement, as shown in FIG. 2, the engine shaft 16 of the specimen 10 is coupled to the INPUT shaft 31, and the left and right drive shaft shafts 17 and 18 are coupled to the left OUTPUT shaft 32 and the right OUTPUT shaft 33, respectively. In the measurement with the noise measuring apparatus 1 of the present embodiment, the left and right OUTPUT shafts 32 and 33 are always operated to rotate at the same speed or to stop together. That is, the left and right drive shaft shafts 17 and 18 are controlled at a constant speed as if the differential 13 is locked.

  As shown in FIG. 1, in the noise measuring apparatus 1 of the present embodiment, a first torque meter 41 and a first motor 42 (M1) are connected to the INPUT shaft 31. That is, the shaft of the first motor 42 is directly connected to the INPUT shaft 31. A second torque meter 44 and a second motor 45 (M2) are connected to the left OUTPUT shaft 32. Further, a third torque meter 46 and a third motor 47 (M3) are connected to the right OUTPUT shaft 33. The shaft of the second motor 45 is directly connected to the left OUTPUT shaft 32, and the shaft of the second motor 47 is directly connected to the right OUTPUT shaft 33. Servo amplifiers 51, 52, and 53 are connected to the motors 42, 45, and 47, respectively. Both axes are rotationally controlled by a motor that receives input from a servo amplifier. Torque during rotation is measured with a torque meter.

  The operation measurement panel 20 is used by a measurer to set various parameters for measurement and acquire measurement results. The operation measurement panel 20 is provided with an instruction input unit 61, a noise measurement result acquisition unit 62, and a speed command control unit 63. The instruction input unit 61 is used by the measurer to input instructions for starting and ending measurement, the type of the specimen 10, the set torque, the set speed, and the like. This instruction input unit 61 performs overall control of the noise measuring apparatus 1 of the present embodiment. The instruction input unit 61 stores a plurality of types of set speeds v corresponding to the elapsed time from the start of measurement in correspondence with the type of the specimen 10 and the like, and the measurer selects and inputs them. The instruction input unit 61 further receives an input of the type of the specimen 10 and sets speed gains Ka and Kb described later in the speed command control unit 63.

  The noise measurement of this embodiment is intended to measure noise generated during acceleration and deceleration of the rotating shaft 11a of MG1 and the rotating shaft 12a of MG2. For this purpose, the rotational speed of the rotating shaft of the MG to be measured is accelerated from the stop state to the maximum speed at a constant rate, for example, as shown at the top of FIG. 4, and from the maximum speed to the stop state at a constant rate. And a deceleration period for deceleration. This series of speed changes is called speed sweep. The speed change is indicated by the set speed v described above, and the acceleration and the maximum speed to be reached differ depending on the type of the specimen 10 and the measurement conditions.

  The noise measurement result acquisition unit 62 acquires the measurement result, displays it on the operation measurement panel 20, and records it. The speed command control unit 63 is for controlling the rotation speed of each axis of the three-axis bench 30 by a speed command corresponding to the type of the specimen 10 to be measured. The speed command control unit 63 includes an OUTPUT axis control unit 63a and an INPUT axis control unit 63b. The OUTPUT axis control unit 63a outputs a speed command to the servo amplifiers 52 and 53 to control the rotation of the left and right OUTPUT axes 32 and 33. In this embodiment, the speed commands output to the servo amplifiers 52 and 53 are the same. The INPUT axis control unit 63 b is for outputting a speed command to the servo amplifier 51 to control the rotational speed of the INPUT shaft 31.

  The speed command control unit 63 receives the settings of the speed gains Ka and Kb calculated based on the type of the specimen 10 input to the instruction input unit 61 and the measurement target (MG1 or MG2). Alternatively, the speed command control unit 63 may calculate the speed gains Ka and Kb according to the type of the specimen 10. At the time of measurement, the speed command control unit 63 calculates two kinds of speed commands ω2 and ω1 by multiplying the set speed v every moment by speed gains Ka and Kb, respectively. Further, the speed command ω1 is output to the servo amplifier 51, and the speed command ω2 is output to both the servo amplifiers 52 and 53, respectively. A method for calculating the speed gains Ka and Kb will be described later.

  The battery simulator 21 imitates a battery that supplies power to the MG1 and MG2. The battery simulator 21 receives an instruction to start or stop the operation from the operation measurement panel 20 and supplies driving power to the inverter 23 based on various operating conditions set by the instruction input unit 61. is there. The torque command control device 22 outputs a torque command to the inverter 23 in accordance with a measurer's instruction from the instruction input unit 61. If the torque command is outside the allowable range, an error signal is output to the operation measurement panel 20.

  The inverter 23 converts the power supplied from the battery simulator 21 into AC power suitable for driving the specimen 10. At that time, the power value of the AC power is adjusted based on the torque command from the torque command control device 22. The inverter 23 can supply individually adjusted electric power to MG1 and MG2. The microphone 24 collects noise and sends it to the FFT device 25. The FFT device 25 performs frequency analysis on the sound data received from the microphone 24 based on the torque values received from the torque meters 41, 44, 46. This result is input to the noise measurement result acquisition unit 62 of the operation measurement panel 20 as a noise distribution together with the torque values of the torque meters 41, 44 and 46.

  In this embodiment, for example, when the MG 1 is rotated, AC power is supplied from the inverter 23 to the MG 1 based on the torque command from the torque command control device 22. The same applies to MG2. Here, the motors 42, 45, 47 are very heavy when viewed from MG1, MG2. Therefore, the actual rotational speed is governed by each motor. Therefore, for example, for MG1, electric power is applied from the servo amplifier 51 to the motor 42 based on the speed command ω1. As a result, the power is transmitted to the motor 42 → INPUT shaft 31 → engine shaft 16 → carrier 14A2 → sun gear 14A3 → rotation shaft 11a, and MG1 is rotated at a rotational speed based on the speed command ω1.

Next, the measurement method according to this embodiment will be described. Prior to the start of measurement, the measurer attaches the specimen 10 to the noise measurement device 1 of the present embodiment. Further, the measurer inputs the type of the specimen 10 from the instruction input unit 61. In this embodiment, noise measurement is performed in the following two modes.
(1) Measurement of MG2 noise + gear noise (first mode)
(2) MG1 noise measurement (second mode)
It is. In (1), “gear noise” is mainly gear meshing noise such as meshing of the Rr planetary gear 14B and the ring gear 14B1, meshing of the counter driven gear 15, and meshing of the differential 13. These are members that are always rotated in conjunction with the rotation of MG2. Therefore, it is impossible to measure MG2 noise separately from gear noise. In both the measurements (1) and (2), the MG to be measured is swept in speed while the other MG is stopped.

  (1) MG2 noise + gear noise is measured by speed sweeping MG2 while MG1 is stopped. Then, an acceleration period and a deceleration period of MG2 are made possible. Since the rotation speed of MG2 is proportional to the rotation speed of the left and right OUTPUT shafts 32 and 33, the left and right OUTPUT shafts 32 and 33 can be rotated based on the set speed v in order to sweep the rotation speed of MG2. That's fine. That is, since ω2 = v, Ka = 1 may be set.

  On the other hand, in order to stop the MG 1 in a state where the left and right OUTPUT shafts 32 and 33 are rotating, a rotation that cancels the accompanying rotation is given to the INPUT shaft 31. For this purpose, a gear ratio P indicating the ratio of the rotational speed of the OUTPUT shafts 32 and 33 to the rotational speed of the INPUT shaft 31 is obtained, and the speed gain Kb is set to Kb = P. That is, ω1 = v × Kb = vP. This rotation speed is the same as the rotation speed of the INPUT shaft 31 when the left and right OUTPUT shafts 32 and 33 are rotated in a state where the MG 1 is forcibly stopped by some means.

The gear ratio coefficient P can be obtained by the following equation.
P = r1 * r2 * r3
However,
r1 = gear ratio of differential 13 r2 = gear ratio of counter driven gear 15 r3 = gear ratio between carrier 14A2 and ring gear 14A1 when sun gear 14A3 of Fr planetary gear 14A is fixed. Note that the gear ratios r1 to r3 are all ratios on the INPUT side / OUTPUT side.

  That is, in this mode of measurement, Ka = 1 and Kb = P are set. In this way, the speed of MG2 can be swept while MG1 is stopped. The gear ratio P is determined by the gear configuration of the specimen 10. Therefore, the speed gains Ka and Kb are values determined for each specimen 10. Therefore, it is preferable to calculate in advance and store it in the operation measurement panel 20 corresponding to the type of the specimen 10.

  FIG. 4 shows changes in speed at various points during this measurement. When the measurement start is instructed by the measurer, the battery simulator 21 is started to operate, and power is supplied to the inverter 23. Torque is generated in MG2 by the electric power from inverter 23, and speed command ω2 is raised with a slight delay. This time is defined as time t1. At the same time, the speed command ω1 is also raised. Then, the rotational speed of MG2 increases according to the speed command ω2. At this time, MG2 continues to generate torque. A time point when the speed of MG2 reaches a predetermined maximum speed is defined as time t2. When time t2 is reached, the torque generated in MG2 is once reset to zero. The speed command ω2 is held at the maximum speed for a while after time t2. Thereafter, a reverse torque is generated in MG2, and the speed command ω2 is also decreased at the same time. Time t3 when MG2 starts decelerating is time t3. And the time when the rotational speed of MG2 becomes 0 is time t4.

  In this mode, the speed indicated as “M2, M3 axis speed” in the third row in FIG. 4 is the speed of the OUTPUT axes 32, 33, and this is also the set speed v. The rotation of the second motor 45 and the third motor 47 is controlled by the servo amplifiers 52 and 53 based on the speed command ω2 (corresponding to v) so that the speed of the OUTPUT shafts 32 and 33 becomes this speed. On the other hand, the INPUT shaft 31 is rotated based on a speed command ω1 (corresponding to v × Kb). That is, the rotation of the first motor 42 is controlled by the servo amplifier 51 as shown in the first stage of FIG. Thereby, MG1 is held in a stopped state.

  In this embodiment, noise generated during the acceleration period (between t1 and t2) and the deceleration period (between t3 and t4) is collected by the microphone 24 and subjected to FFT analysis. Since MG1 is stopped during this measurement period, the main noise sources are MG2, counter driven gear 15, and differential 13. Therefore, the noise due to MG2 can be measured fairly accurately.

  (2) The noise measurement of MG1 is performed by sweeping the speed of MG1 while MG2 is stopped. The MG 2 can be stopped by stopping the rotation of the left and right OUTPUT shafts 32 and 33. Therefore, ω2 = 0 may be set. That is, Ka = 0 may be set. On the other hand, the INPUT shaft 31 sweeps the speed based on the set speed v. That is, ω1 = v and Kb = 1. Thereby, as shown in the second stage of FIG. 5, the rotational speed of MG1 is controlled. The set speed v may not be the same as in the case of the measurement in (1).

  FIG. 5 shows changes in speed at various points during this measurement. When the measurement start is instructed by the measurer, the battery simulator 21 is started to operate and electric power is sent to the inverter 23. The inverter 23 supplies AC power to the MG 1 based on the torque command from the torque command control device 22. Thereafter, the speed command ω1 is started. Then, the rotation of the first motor 42 is controlled by the servo amplifier 51, whereby the rotation of MG1 is started. This time is defined as time t5. As the speed command ω1 increases, the speed further increases and reaches a predetermined maximum speed. This time is defined as time t6. When time t6 is reached, the torque generated in MG1 is set to zero. Thereafter, a reverse torque is generated in MG1, and at the same time, the speed command ω1 is decreased to decelerate MG1. The time point at which this deceleration starts is defined as time t7. The time point when the speed of MG1 becomes 0 is time t8.

  In this mode, since the speed command ω2 = 0 is set in MG2, the second motor 45 and the third motor 47 are not rotated as shown in the graph in the fourth row in FIG. That is, the left and right OUTPUT shafts 32 and 33 do not rotate. Thus, as shown in the fifth graph of FIG. 5, MG2 does not rotate. In this mode, noise generated during the acceleration period (between t5 and t6) and the deceleration period (between t7 and t8) is collected by the microphone 24 and subjected to FFT analysis. Since MG2 is stopped during this measurement, MG1 is the main noise source. Therefore, the noise due to MG1 can be accurately measured.

As described in detail above, according to the noise measuring apparatus 1 of the present embodiment,
(1) In the measurement of MG2 noise + gear noise, Ka = 1 and Kb = P. Accordingly, the rotation speed of MG2 is swept while the rotation of MG1 is stopped.
(2) In the noise measurement of MG1, Ka = 0 and Kb = 1. Accordingly, the rotation speed of MG1 is swept while the rotation of MG2 is stopped.
Therefore, extra noise from other than the measurement location is very small, and this is a noise measurement method capable of increasing the noise measurement accuracy of MG2 with simple control. Note that the order of measurement in (1) and (2) may be reversed, or only (1) may be performed.

In addition, this form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, in the measurement of (1) in the above form, the set speed v of the OUTPUT shaft 32 is stored and the speed command ω1 of the INPUT shaft 31 is calculated, but this corresponds to the speed command ω1 of the INPUT shaft 31 May be stored as the set speed, and the speed command ω2 of the OUTPUT shaft 32 may be calculated from ω2 = ω1 / P.
Further, if there is no difference in noise depending on whether torque is generated or not, noise may be measured in a state where torque is not generated in MG1 and MG2.
Further, for example, an acceleration pickup can be provided in contact with the specimen instead of the microphone to measure vibration. If a laser is used, vibration can be measured without contact.

It is a schematic block diagram of the noise measuring device which concerns on this form. It is a schematic block diagram of the specimen which is a measuring object of a noise measuring device. It is explanatory drawing which showed typically the gear structure of the test body. It is a time chart at the time of MG2 noise and gear noise measurement. It is a time chart at the time of MG1 noise measurement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Noise measuring device 10 Specimen 20 Operation measurement board 23 Inverter 24 Microphone 42 1st motor 44 2nd motor 47 3rd motor 61 Instruction input part 63 Speed command control part

Claims (7)

The first and second rotating electric machines, the first and second input / output rotating shafts, and the first rotating electric machine, the first input / output rotating shaft, and the second input / output rotating shaft. Rotation of the specimens connected by gears so that the rotational speeds of the two are linearly coupled and the rotational speeds of the second rotating electrical machine and the second input / output rotating shaft are proportional to each other. In the noise measuring device that measures the acoustic noise at the time,
A rotation speed operation unit for individually operating the rotation speeds of the first and second input / output rotation shafts;
A control unit for controlling the rotation speed operation unit;
A noise acquisition unit for acquiring acoustic noise of the specimen,
The control unit rotates the first and second input / output rotating shafts at a rotation speed ratio at which the first rotating electrical machine does not rotate by the rotation speed operation unit, and in that state, the noise acquisition unit causes the specimen to rotate. A noise measurement apparatus that performs measurement in a first mode for acquiring acoustic noise. In the noise measuring device according to claim 1,
The control unit acquires the acoustic noise of the specimen by the noise acquisition unit during acceleration and deceleration. In the noise measuring device according to claim 1 or 2,
The control unit rotates the first input / output rotation shaft by the rotation speed operation unit and stops the second input / output rotation shaft, and acquires the acoustic noise of the specimen by the noise acquisition unit in this state. A noise measuring apparatus that performs two-mode measurement. In the noise measuring device according to any one of claims 1 to 3,
For a specimen having two second input / output rotating shafts, which are coupled to a second rotating electrical machine via a differential,
The noise measuring device characterized in that the rotational speed operation unit always matches the rotational speeds of the two second input / output rotational shafts. In the noise measuring device according to any one of claims 1 to 4,
The controller is
A first speed command signal for instructing the rotation speed operation unit to rotate the first input / output rotation shaft at a rotation speed obtained by multiplying the reference rotation speed by a gain, and rotation by multiplying the reference rotation speed by a second gain. A speed command control unit for outputting a second speed command signal for instructing the rotation speed operation unit to rotate the second input / output rotation shaft at a speed;
During the measurement in the first mode, the ratio between the first gain and the second gain in the speed command control unit is set to the first and second values when the first rotating electrical machine is stopped by the specimen. And a gain setting unit for setting the same as the gear ratio of the input / output rotation shaft. In the noise measuring device according to any one of claims 1 to 5,
An operating unit for generating torque in the second rotating electrical machine;
The noise measurement device, wherein the control unit performs measurement in a first mode while generating torque in the second rotating electrical machine by the operating unit. The first and second rotating electric machines, the first and second input / output rotating shafts, and the first rotating electric machine, the first input / output rotating shaft, and the second input / output rotating shaft. Rotation of the specimens connected by gears so that the rotational speeds of the two are linearly coupled and the rotational speeds of the second rotating electrical machine and the second input / output rotating shaft are proportional to each other. In the noise measurement method to measure acoustic noise at the time,
A noise measuring method characterized in that the first and second input / output rotating shafts are rotated at a rotation speed ratio at which the first rotating electrical machine does not rotate, and the acoustic noise of the specimen is acquired in that state.

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