JP2021081193A - Gear noise measurement method - Google Patents

Abstract

To provide a gear noise measurement method that can simplify the equipment and ensure the quality of measurement by no-load measurement without torque load applied by a work motor.SOLUTION: In an HV transaxle 100 including: a counter gear pair composed of a counter drive gear 110 of an engine shaft 111, a drive gear 120 of a second work motor MG2, and a counter driven gear 131; and a final gear pair composed of a counter-driven gear 132 and a gear 141 of a differential shaft 142, the engine shaft 111 and the differential shaft 142 are rotated so that the drag torque is generated in the counter gear pair and the final gear pair by increasing the rotation speed difference between the engine shaft 111 and the differential shaft 142 without applying current to a first work motor MG1 and the work motor MG2, and the generated gear noise is measured in a gear noise measurement method in the present invention.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for measuring gear noise, and measures 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 (Hybrid Vehicle) transaxle. The present invention relates to a method for measuring gear noise.

The 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 the output shafts connected to both wheels via various gears and differentials. In the following, the MG on the side where the input shafts from the engine are connected and mainly functions as a generator is referred to as MG1. Further, the MG on the side where the output shafts to both wheels are connected via various gears and differentials and mainly functions as a motor is called MG2. The various gears include a counter-driven gear in which the ring gears of the two planetary gears are integrated. The rotating shaft of MG1 is connected to the sun gear of Fr planetary gear, and the rotating shaft of MG2 is connected to the sun gear of Rr planetary gear.

For example, in Patent Document 1, with respect to a specimen having first and second rotary electric machines (MG1 and MG2), the first and second input / output rotation shafts are rotated at a rotation speed ratio at which MG1 does not rotate. ， It is described that the acoustic noise is acquired by the microphone in that state.

JP-A-2009-216486

The gear noise measurement of the HV transaxle controls to drive the MG1 shaft and the MG2 shaft of the work motor, and the four shafts of the engine shaft and the differential shaft on the vehicle side. Then, the work motor performs torque control, and the engine shaft and differential shaft perform rotation speed control that reproduces vehicle acceleration / deceleration, thereby performing sweep control of acceleration and deceleration while applying a torque load to the gear pair.

However, in this control, it is necessary to apply a current to MG1 and MG2 of the work motor to apply a torque load, so that there is a problem that the number of control devices increases and the equipment becomes expensive.

An object of the present invention is to provide a gear noise measuring method capable of simplifying equipment and ensuring the quality of measurement by no-load measurement in which a torque load is not applied by a work motor.

The gear noise measuring method of one embodiment includes a first rotary electric machine, a second rotary electric machine, an engine shaft for transmitting the rotation of the first rotary electric machine and the engine, and a differential shaft, and a counter drive of the engine shaft. The first gear, the drive gear of the second rotary electric machine, and the counter-driven gear form a counter gear pair, and the counter-driven gear and the differential shaft gear form a final gear pair. The engine so that drag torque is generated in the counter gear pair and the final gear pair by increasing the rotation speed difference between the engine shaft and the differential shaft without applying a current to the rotary electric machine and the second rotary electric machine. The shaft and differential shaft were rotated to measure the generated gear noise.

According to the present invention, it is possible to provide a gear noise measuring method capable of simplifying equipment and ensuring the quality of measurement by no-load measurement in which a torque load is not applied by a work motor.

It is a schematic diagram which shows an example of the HV transaxle which is the object of the gear noise measurement which concerns on this embodiment. It is a schematic diagram which shows an example of the HV transaxle which is the object of the gear noise measurement which concerns on this embodiment. It is a block diagram which shows an example of the gear noise measuring apparatus which concerns on this embodiment. It is a graph which shows an example of the sweep control in the conventional method of measuring gear noise. It is a graph which shows an example of the sweep control in the measurement method of the gear noise which concerns on this embodiment.

Embodiments of the present invention Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted as necessary to clarify the explanations.

FIG. 1 is a schematic view showing an example of an HV transaxle that is a target of gear noise measurement according to the present embodiment. Further, FIG. 2 is a schematic view showing an example of an HV transaxle that is a target of gear noise measurement according to the present embodiment. FIG. 2 is a view showing the HV transaxle from an angle different from that of FIG.

In FIGS. 1 and 1, the HV transaxle 100 includes work motors MG1 and MG2, an E / G counter drive gear 110, a Mo drive gear 120, a counter driven gear 130, and a differential 140. Further, when measuring gear noise, the microphone 206 is arranged in the HV transaxle.

MG1 is an MG (Motor Generator) that mainly functions as a generator. Further, MG2 is an MG on the side that mainly functions as a motor. MG1 and MG2 are also called rotary electric machines. Further, at a position coaxial with the rotation shaft 101 of the rotor of the MG1, an engine shaft 111 that receives a drive from an internal combustion engine (not shown) with the HV transaxle 100 mounted on an automobile is arranged.

The E / G counter drive gear 110 includes an engine shaft 111 extending from the center of rotation of the gear to one side and a rotating shaft 101 of MG1 extending from the center of rotation of the gear to the other side. The engine shaft 111 is connected to an internal combustion engine (not shown) to transmit the rotational motion of the internal combustion engine. The rotation shaft 101 of the MG1 is connected to the work motor MG1 to transmit the rotational motion of the work motor MG1.

The rotary shaft 101 and engine shaft 111 of MG1 and the rotary shaft 121 of MG2 are coupled via a counter-driven gear 130. Specifically, in the counter-driven gear 130, the first counter-driven gear 131 and the second counter-driven gear 132 are coaxially coupled. Then, the E / G counter drive gear 110 and the Mo drive gear 120 mesh with the first counter driven gear 131. Further, the gear 141 of the differential 140 meshes with the second counter driven gear 132. As a result, the E / G counter drive gear 110, the Mo drive gear 120, and the differential 140 are coupled via the counter driven gear 130.

A counter gear pair is composed of an E / G counter drive gear 110 of the engine shaft 111, a Mo drive gear 120 of MG2, and a first counter driven gear 131.
Further, the second counter driven gear 132 and the gear 141 of the differential 140 form a final gear pair.

The gear noise measuring method of the present embodiment measures the gear noise generated from the counter gear pair and the final gear pair of the HV transaxle 100 having the above configuration.

Next, the gear noise measuring device used in the gear noise measuring method of the present embodiment will be described. FIG. 3 is a block diagram showing an example of the gear noise measuring device according to the present embodiment. In FIG. 3, the measuring device 200 includes an instruction input unit 201, a speed command control unit 202, a first servo amplifier 203-1, a second servo amplifier 203-2, a first motor 204-1 and a second. It includes a motor 204-2, a first torque meter 205-1, a second torque meter 205-2, a microphone 206, an FFT device 207, and a noise measurement result acquisition unit 208.

The instruction input unit 201 is an interface circuit that receives an input of a speed command.
The speed command control unit 202 is a control circuit that outputs to the first servo amplifier 203-1 and the second servo amplifier 203-2 according to the speed command input from the instruction input unit 201.

The first servo amplifier 203-1 is a servo amplifier that controls the rotation speed of the first motor 204-1 based on the speed command instructed by the speed command control unit 202. The second servo amplifier 203-2 is a servo amplifier that controls the rotation speed of the second motor 204-2 based on the speed command instructed by the speed command control unit 202.

The first motor 204-1 is a motor that rotates the engine shaft 111. The second motor 204-2 is a motor that rotates the differential shaft 142.

The first torque meter 205-1 is a torque meter that measures the torque load applied to the rotating shaft 101 of the MG1. The second torque meter 205-2 is a torque meter that measures the torque load applied to the rotating shaft 121 of the MG2.

The microphone 206 collects the generated gear noise and converts it into an electric signal. Then, the microphone 206 outputs the noise signal converted into the electric signal to the FFT device 207.

The FFT device 207 Fourier transforms the noise signal received from the microphone 206 for frequency analysis. Then, the FFT device 207 outputs the frequency analysis result to the noise measurement result acquisition unit 208. For example, the FFT device is preferably a computer device including a CPU (Central Processing Unit) and a memory.

The noise measurement result acquisition unit 208 displays the result of frequency analysis. For example, the noise measurement result acquisition unit 208 is preferably a liquid crystal display or an organic EL display.

With the above configuration, in the gear noise measuring method of the present embodiment, no current is applied to the first rotating electric machine MG1 and the second rotating electric machine MG2 with respect to the HV transformer axle 100, and the engine shaft 111 and the differential shaft 142 are used. The engine shaft 111 and the differential shaft 142 are rotated so that the drag torque is generated between the counter gear pair and the final gear pair by increasing the difference in the number of rotations of the engine shaft 111, and the generated gear noise is measured. Next, the rotation speed control of the engine shaft 111 and the differential shaft 142 will be described.

FIG. 4 is a graph showing an example of sweep control in the conventional gear noise measuring method. Further, FIG. 5 is a graph showing an example of sweep control in the gear noise measuring method according to the present embodiment. In FIGS. 4 and 5, the vertical axis indicates the rotation speed (rpm) and torque (Nm) of each axis. The horizontal axis shows the time.

FIG. 4 shows the result of rotating the engine shaft and the differential shaft to reproduce vehicle acceleration / deceleration while applying a torque load by passing a current through MG1 and MG2 of the work motor by a conventional method. FIG. 5 shows the result of rotating the engine shaft and the differential shaft to reproduce the vehicle acceleration / deceleration without passing a current through the MG1 and MG2 of the work motor by the method of the present embodiment.

In FIG. 4, the change in the rotation speed of the differential shaft is 12 rpm / s, and the change in the rotation speed of the engine shaft is 24 rpm / s. On the other hand, in FIG. 5, the change in the rotation speed of the differential shaft is 120 rpm / s, and the change in the rotation speed of the engine shaft is 240 rpm / s. Therefore, the difference between the amount of change in the engine speed and the amount of change in the differential shaft speed is 120 rpm / s.

As shown in FIG. 4, conventionally, the work motor itself generates a torque load by controlling the flow of current through the work motor. On the other hand, as shown in FIG. 5, in the present embodiment, a torque load is generated on the work motors MG1 and MG2 by a drag torque load due to inertia that increases the sweep speed at the time of measurement without applying a current to the work motor. I can make you.

As described above, according to the gear noise measuring method of the present embodiment, the work motors MG1 and MG2 are generated by increasing the sweep speed at the time of measurement and generating a torque load on the work motors MG1 and MG2 by the drag torque load due to inertia. Gear noise measurement can be established without applying current to the.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. For example, in the present embodiment, an example in which the change in the rotation speed of the differential shaft is 120 rpm / s and the change in the rotation speed of the engine shaft is 240 rpm / s is described. The amount of change in the rotation speed of the engine shaft may be further increased.

100 HV Transformer Axle 101 Rotating Shaft 110E / G Counter Drive Gear 111 Engine Shaft 120 Mo Drive Gear 121 Rotating Shaft 130 Counter Driven Gear 131 1st Counter Driven Gear 132 2nd Counter Driven Gear 140 Diff 141 Gear 142 Diff Shaft 200 Measuring Device 201 Instruction Input Unit 202 Speed command control unit 203-1 1st servo amplifier 2032 2nd servo amplifier 204-1 1st motor 204-2 2nd motor 205-1 1st torque meter 205-2 2nd torque meter 206 Mike 207 FFT device 208 Noise measurement result acquisition unit MG1, MG2 work motor

Claims (1)

It is provided with a first rotary electric machine, a second rotary electric machine, an engine shaft for transmitting the rotation of the first rotary electric machine and the engine, and a differential shaft.
A counter gear pair is composed of the counter drive gear of the engine shaft, the drive gear of the second rotary electric machine, and the counter driven gear.
For the HV transaxle, which constitutes the final gear pair with the counter-driven gear and the gear of the differential shaft.
No current was applied to the first rotary electric machine and the second rotary electric machine.
By increasing the rotation speed difference between the engine shaft and the differential shaft, the engine shaft and the differential shaft are rotated so that drag torque is generated between the counter gear pair and the final gear pair.
A method of measuring gear noise that measures the generated gear noise.

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