Noise determination device

Abstract

To enable enhancing accuracy of identifying an occurrence factor of noise.SOLUTION: A processing circuit of a noise determination device is configured to: in a case where a frequency of noise included in sound data collected while a vehicle driving device actuates and a meshing primary frequency of a planetary gear mechanism coincide with each other (S19:YES), determine, when starting an engine, or stopping actuating the engine (S23:YES), that the noise is caused by contact between a plurality of teeth of mutually meshed rotating elements in the planetary gear mechanism is sound (S25); and on the other hand, when the engine is neither started nor actuated (S23:NO), determine that the planetary gear mechanism is an occurrence source of the noise (S27).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a abnormal sound determination device.

Background Art

[0002] Patent Document 1 discloses an abnormal sound analysis device that identifies a rotating body that is a sound source from among a plurality of rotating bodies. The device calculates an order that does not depend on the rotation speed of the rotating body based on data of sound or vibration generated as the rotating body rotates. Then, the device identifies the rotating body that is the sound source based on the order.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to improve the accuracy of identifying the cause of abnormal sound.

Means for Solving the Problems

[0005] The abnormal noise determination device for solving the above problems is applied to a vehicle drive device that includes an engine, a first motor generator, and a second motor generator as power sources of a vehicle, and the engine, the first motor generator, and the second motor generator are connected via a planetary gear mechanism. When the frequency of the abnormal noise included in the sound data collected by the microphone during the operation of the vehicle drive device matches the meshing primary frequency of the planetary gear mechanism, when starting the engine or stopping the operation of the engine, it is determined that the abnormal noise is a sound caused by the contact of the teeth of the rotating elements meshing with each other in the planetary gear mechanism, and when it is neither at the start nor at the stop of the engine operation, it is determined that the planetary gear mechanism is the source of the abnormal noise.

Effect of the Invention

[0006] According to the above abnormal noise determination device, the accuracy of specifying the cause of the abnormal noise can be improved.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0008] Hereinafter, an embodiment of the abnormal noise determination device will be described with reference to FIGS. 1 to 3. FIG. 1 shows an abnormal noise determination device 30 and a vehicle drive device 10. <Configuration of Vehicle Drive Device> The vehicle drive device 10 is mounted on a hybrid vehicle. The vehicle drive device 10 includes an engine 11, a first motor generator 12, and a second motor generator 13 as power sources of the vehicle. Hereinafter, the first motor generator 12 is referred to as "first MG12", and the second motor generator 13 is referred to as "second MG13".

[0009] The vehicle drive device 10 includes a planetary gear mechanism 15. The planetary gear mechanism 15 has a plurality of rotating elements that mesh with each other. The crankshaft 11a of the engine 11 is connected to the carrier C of the planetary gear mechanism 15. The rotating shaft 12a of the first MG12 is connected to the sun gear S of the planetary gear mechanism 15. The rotating shaft 13a of the second MG13 is connected to the ring gear R of the planetary gear mechanism 15.

[0010] <Configuration of abnormal noise determination device> The abnormal noise determination device 30 includes a notification device 31 and a control device 40. The notification device 31 notifies an operator who uses the abnormal noise determination device 30 of the information transmitted from the control device 40. The notification device 31 has, for example, a display and a speaker. Sound data collected by a microphone 20 installed inside the vehicle is input to the control device 40. The microphone 20 is installed at a position where the operating sound of the vehicle drive device 10 can be collected. For example, the microphone 20 is installed in the engine room of the hybrid vehicle or inside the vehicle cabin.

[0011] The processing circuit 41 of the control device 40 has a CPU 42, a first memory 43, and a second memory 44. A program executed by the CPU 42 is stored in the first memory 43. The calculation results of the CPU 42 and the like are stored in the second memory 44. By the CPU 42 executing the program in the first memory 43, the processing circuit 41 identifies the cause of the abnormal noise in the planetary gear mechanism 15.

[0012] <Cause determination process> Referring to FIG. 2, a series of processes, namely, the cause determination process, for identifying the cause of the abnormal noise in the planetary gear mechanism 15 will be described.

[0013] In step S11, the processing circuit 41 identifies the vehicle type. In the next step S13, the processing circuit 41 acquires the gear ratio of the planetary gear mechanism 15 and the number of teeth of each gear mounted on the vehicle of the identified vehicle type.

[0014] In the subsequent step S15, the processing circuit 41 acquires the sound data collected by the microphone 20. In the next step S17, the processing circuit 41 calculates the meshing fundamental frequency of the planetary gear mechanism 15 based on the rotational speed Nmg1 of the first MG12, the engine rotational speed Ne, and the wheel speed Vw. In the subsequent step S19, the processing circuit 41 determines whether the frequency of the vibration included in the sound data matches the meshing fundamental frequency. If the processing circuit 41 determines that they match (S19: YES), the process proceeds to step S23. On the other hand, if the processing circuit 41 determines that they do not match (S19: NO), the process proceeds to step S21.

[0015] In step S21, the processing circuit 41 determines that no abnormal noise is generated from the planetary gear mechanism 15, and the process proceeds to step S29. In step S23, the processing circuit 41 determines whether at least one of the conditions that it is the start time of the engine 11 and that it is the stop time of the operation of the engine 11 is satisfied. If at least one of the conditions that it is the start time of the engine 11 and that it is the stop time of the operation of the engine 11 is satisfied (S23: YES), the process proceeds to step S25. On the other hand, if neither of the conditions that it is the start time of the engine 11 and that it is the stop time of the operation of the engine 11 is satisfied (S23: NO), the process proceeds to step S27.

[0016] In step S25, the processing circuit 41 determines that abnormal noise has occurred in the planetary gear mechanism 15 due to the start or stop of the engine 11. When the engine 11 starts or stops, noise may occur due to the contact between the teeth of the rotating elements that mesh with each other in the planetary gear mechanism 15. In step S25, the processing circuit 41 determines that such noise has occurred. Then, the processing circuit 41 transfers the process to step S29.

[0017] In step S27, the processing circuit 41 determines that the planetary gear mechanism 15 is the source of the abnormal noise. Then, the processing circuit 41 transfers the process to step S29. In step S29, the processing circuit 41 causes the notification device 31 to notify the determination result. After that, the processing circuit 41 ends the cause determination process.

[0018] <Actions and Effects of the Present Embodiment> Referring to FIG. 3, the actions and effects of the present embodiment will be described. As shown in FIGS. 3(A) to 3(E), the meshing fundamental frequency of the planetary gear mechanism 15 decreases as the rotational speed Nmg1 of the first MG12 increases. When the accelerator opening starts to increase at timing t1, the engine 11 starts at subsequent timing t2. Then, the MG1 torque, which is the output torque of the first MG12, fluctuates. At this time, abnormal noise due to the start of the engine 11 occurs in the planetary gear mechanism 15.

[0019] In the present embodiment, even when the frequency of the abnormal noise included in the sound data matches the meshing fundamental frequency, it is determined that the abnormal noise caused by the start of the engine 11 has occurred temporarily. That is, it is determined that the source of the abnormal noise is not the planetary gear mechanism 15.

[0020] Note that even when the engine 11 stops operating, the torque of MG1 fluctuates. Therefore, abnormal noise caused by the stoppage of the engine 11 occurs in the planetary gear mechanism 15. At this time, even if the frequency of the abnormal noise included in the sound data matches the meshing fundamental frequency, it is determined that the abnormal noise caused by the stoppage of the engine 11 is temporarily generated. That is, it is determined that the source of the abnormal noise is not the planetary gear mechanism 15.

[0021] On the other hand, when it is neither the start nor the stop of the engine 11, if the frequency of the abnormal noise included in the sound data matches the meshing fundamental frequency, it is determined that the source of the abnormal noise is the planetary gear mechanism 15.

[0022] Therefore, the abnormal noise determination device 30 can improve the accuracy of identifying the cause of the abnormal noise.

Explanation of Reference Numerals

[0023] 10…Vehicle drive device, 11…Engine, 12…First motor generator (first MG), 13…Second motor generator (second MG), 15…Planetary gear mechanism, 20…Microphone, 30…Abnormal noise determination device, 40…Control device, 41…Processing circuit.

Claims

【Claim 1】 It is applied to a vehicle drive device that includes an engine, a first motor generator, and a second motor generator as power sources for the vehicle, and the engine, the first motor generator, and the second motor generator are connected via a planetary gear mechanism. When the frequency of the abnormal noise included in the sound data collected by the microphone during the operation of the vehicle drive device matches the meshing primary frequency of the planetary gear mechanism. At the start of the engine or when the engine stops operating, it is determined that the abnormal noise is a sound caused by contact between the teeth of the rotating elements that mesh with each other in the planetary gear mechanism. When it is neither at the start of the engine nor when the engine stops operating, it is determined that the planetary gear mechanism is the source of the abnormal noise. Abnormal noise determination device.

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