WO2019044329A1

WO2019044329A1 - Diagnosis device and diagnosis method

Info

Publication number: WO2019044329A1
Application number: PCT/JP2018/028556
Authority: WO
Inventors: 田中　英一; 友紀東海林
Original assignee: いすゞ自動車株式会社
Priority date: 2017-08-31
Filing date: 2018-07-31
Publication date: 2019-03-07
Also published as: JP2019045263A; JP6907826B2; CN111051844A; CN111051844B

Abstract

A diagnosis device for a release bearing 27 of a clutch device 20 that is capable of cutting off the power transmitted from a drive source 10 installed in a vehicle 1 to a transmission 40, said diagnosis device comprising a microphone 80 for acquiring the actual operating sound of the release bearing 27 and a failure diagnosis unit 100 for predicting the failure of the release bearing 27 on the basis of the actual operating sound acquired by the microphone 80 and a reference operating sound that is from a failed release bearing and has been acquired beforehand.

Description

Diagnostic device and diagnostic method

The present disclosure relates to a diagnostic device and a diagnostic method, and more particularly to failure diagnosis of a release bearing of a clutch device capable of connecting and disconnecting power transmitted from a drive source mounted on a vehicle to a transmission.

Conventionally, various techniques have been proposed to appropriately notify the driver that the parts need to be replaced if the possibility of breakage or the like is generated by predicting the life of various parts mounted on a vehicle. (See, for example, Patent Documents 1 and 2).

Japanese Patent Application Laid-Open No. 2013-231673 Japanese Patent Application Laid-Open No. 2002-92137

By the way, in a general clutch device, a release bearing is interposed between the diaphragm spring and the release fork so as to make them relatively rotatable. When such a release bearing is gradually deteriorated or damaged, it generates an abnormal noise having a peak value in the sound pressure level in a specific frequency range, that is, an operating noise having a characteristic different from that of a normal release bearing. It will be.

This abnormal noise is a precursor to the failure of the release bearing, and if the vehicle continues to travel in such a state, the release bearing may cause seizing due to thermal deterioration of the grease and the like, leading to failure. In particular, since the release bearing is covered by the clutch housing, it is difficult for the driver in the vehicle compartment to detect abnormal noise, and it is impossible for the driver to detect in advance hearing failure of the release bearing. There is a problem such as

Further, the degree of deterioration of the release bearing changes in accordance with the driver of the vehicle and the driving situation (such as the driving frequency and the size of the load). For this reason, the failure occurrence time of the release bearing is also different for each vehicle depending on the driver of the vehicle and the driving situation, and it is difficult to uniformly set an appropriate parts replacement time based on the traveling distance and the traveling time There is also a problem such as

If the release bearing fails, power can not be transmitted from the drive source to the transmission, and the vehicle can not run on the road. Therefore, by effectively predicting the failure occurrence time and notifying the driver appropriately It is desirable to prevent the road breakdown of the vehicle in advance.

The technique of the present disclosure aims to effectively predict the occurrence of a failure of a release bearing.

The device of the present disclosure is a diagnostic device of a release bearing of a clutch device capable of connecting and disconnecting power transmitted from a drive source mounted on a vehicle to a transmission, and a sound collecting device acquires an actual operating sound of the release bearing. And failure diagnosis means for predicting the occurrence of a failure of the release bearing based on the actual operation sound acquired by the sound collection means and the reference operation sound of the release bearing of the failed product acquired in advance. It is characterized by

In addition, the failure diagnosis means may travel until the failure occurs in the release bearing based on the difference between the peak value of the sound pressure level of the reference operation sound and the peak value of the sound pressure level of the actual operation sound. The possible distance or the possible travel time may be estimated, and it may be determined that the release bearing may have a failure possibility when the possible travel distance or the possible travel time is less than a predetermined threshold.

Further, the failure diagnosis means determines a difference between the peak value of the sound pressure level of the actual operation sound collected this time and the peak value of the sound pressure level of the actual operation sound collected last time By dividing by the traveling distance or period traveling time obtained by subtracting the traveling distance or traveling time at the previous sound collection from the traveling time, the rate of change of the actual operating sound from the previous sound collection to the current sound collection The travelable distance or the travel can be calculated by dividing the difference between the peak value of the sound pressure level of the reference operation sound and the peak value of the sound pressure level of the actual operation sound collected this time by the change rate The possible time may be calculated.

The sound collecting means may be a unidirectional, sharp directional or superdirective microphone, and the microphone may be fixed to the front wall of the transmission.

The information processing apparatus may further include notification means for notifying the driver of the information when it is determined by the failure diagnosis means that there is a possibility of occurrence of a failure in the release bearing.

A method of the present disclosure is a diagnostic method of a release bearing of a clutch device capable of connecting and disconnecting power transmitted from a drive source mounted on a vehicle to a transmission, and acquiring an actual operation noise of the release bearing. It is characterized in that the occurrence of a failure of the release bearing is predicted based on the actual operation noise and a reference operation noise of a release bearing of a failed product obtained in advance.

Further, the diagnostic method can travel until the failure occurs in the release bearing based on the difference between the peak value of the sound pressure level of the reference operation sound and the peak value of the sound pressure level of the actual operation sound. Calculating the distance or the travelable time, and determining whether the travelable distance or the travelable time is less than or equal to a predetermined threshold, the travelable distance or the travelable time It may be determined that the release bearing has a possibility of occurrence of failure when it is determined that the value is equal to or less than a predetermined threshold value.

In the diagnostic method, the difference between the peak value of the sound pressure level of the actual operation sound collected this time and the peak value of the sound pressure level of the actual operation sound collected last time is the traveling distance or traveling at the time of current collection. Calculate the rate of change of the actual operation sound from the previous sound collection to the current sound collection by dividing it by the period travel distance or period travel time obtained by subtracting the travel distance or travel time at the previous sound collection from time. In the step of calculating the travelable distance or the travelable time, the difference between the peak value of the sound pressure level of the reference operation sound and the peak value of the sound pressure level of the actual operation sound collected this time is The travelable distance or the travelable time may be calculated by dividing by the change rate.

According to the technology of the present disclosure, it is possible to effectively predict the occurrence of failure of the release bearing.

FIG. 1 is a schematic overall configuration diagram of a vehicle equipped with a diagnostic device according to an embodiment of the present disclosure. FIG. 2 is a schematic functional block diagram showing a diagnostic device according to an embodiment of the present disclosure. FIG. 3 is a schematic view showing an example of an operation sound map according to an embodiment of the present disclosure. FIG. 4 is a flowchart illustrating a diagnosis process according to an embodiment of the present disclosure.

Hereinafter, a diagnostic device and a diagnostic method according to an embodiment of the present disclosure will be described based on the attached drawings. The same parts are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description about them will not be repeated.

FIG. 1 is a schematic overall configuration diagram of a vehicle 1 equipped with a diagnostic device according to the present embodiment. An input shaft 42 of a transmission 40 is connected to a crankshaft 11 of the engine 10 via a clutch device 20 so as to be able to be connected and disconnected.

The transmission case 41 of the transmission 40 includes a substantially cylindrical side wall case portion 41A, a front cover portion (an example of a front wall portion) 41B covering the front end opening of the side wall case portion 41A, and a rear end of the side wall case portion 41A. And a rear cover portion 41C covering the opening. An input shaft 42 is rotatably supported by the front cover portion 41B via a bearing (not shown). An output shaft 43 is rotatably supported by a rear cover portion 41C via a bearing (not shown). Further, a countershaft 44 disposed in parallel with the input shaft 42 and the output shaft 43 is rotatably supported by the front and

rear cover portions

41B and 41C via bearings (not shown). On each of these shafts 42 to 44, a plurality of transmission gear trains 45, a synchronization mechanism (not shown) and the like are arranged. Further, left and right driving wheels are connected to the output shaft 43 via a propeller shaft 47, a differential device (not shown), and left and right driving shafts.

The clutch device 20 is, for example, a dry single-plate clutch device, and the output side end of the crankshaft 11 and the input side end of the input shaft 42 are disposed in the clutch housing 21.

At the input end of the input shaft 42, a clutch disc 22 is provided movably in the axial direction. The clutch disc 22 is provided with a damper spring (not shown) and a clutch facing 23.

The flywheel 12 is fixed to the output end of the crankshaft 11, and a clutch cover 24 is provided on the rear side surface of the flywheel 12. A pressure plate 25 and a diaphragm spring 26 are disposed between the flywheel 12 and the clutch cover 24.

The release fork 28 is provided swingably around the fulcrum 19. The release fork 28 has one end side housed in the clutch housing 21 and the other end side protruding outside the clutch housing 21.

The release bearing 27 is provided between the inner peripheral edge of the diaphragm spring 26 and one end of the release fork 28 to allow the diaphragm spring 26 and the release fork 28 to rotate relative to each other. More specifically, the release bearing 27 includes an inner ring (rotating ring) A with which the inner peripheral edge of the diaphragm spring 26 contacts, an outer ring (non-rotating ring) C to which one end of the release fork 28 is connected, and the inner ring A and the outer ring And a sphere B rotatably disposed between C. The release bearing 27 is moved to the output side (right direction in the figure) by the elastic force of the diaphragm spring 26 at the time of contact operation when the clutch device 20 switches from disconnection to contact, and at the time of disconnection operation when the clutch device 20 switches from connection to disconnection. It is pushed by the release fork 28 and moved to the input side (left direction in the drawing).

A release cylinder 30 is provided outside the clutch housing 21. The release cylinder 30 is movably accommodated inside the cylinder body 31 and has a piston 32 defining an oil pressure chamber, a proximal end fixed to the piston 32, and a push whose distal end abuts against the release fork 28 A rod 33 and a spring 34 provided in the cylinder body 31 to hold the push rod 33 between the piston 32 and the release fork 28 are provided. The release cylinder 30 is connected to the master cylinder 60 via a pipe 35.

The master cylinder 60 has a reserve tank 61 for storing hydraulic oil, a piston 63 movably accommodated in the cylinder body 62 to define an oil pressure chamber, a proximal end fixed to the piston 63, and a distal end And a clutch pedal 70, and a return spring 65 provided in the hydraulic pressure chamber for biasing the piston 63. Further, the master cylinder 60 is provided with a stroke sensor 56 that detects the stroke amount (clutch engagement / disengagement) of the rod 64. A sensor value of the stroke sensor 56 is input to an electrically connected electronic control unit (hereinafter, ECU) 100.

In the clutch device 20, when the driver depresses the clutch pedal 70, the piston 32 moves in a stroke together with the push rod 33 by the hydraulic pressure supplied from the master cylinder 60 to the release cylinder 30, and the release fork 28 is counterclockwise in FIG. By rotating around and pressing the release bearing 27, it is possible to switch from "contact" to "disconnect". On the other hand, in the clutch device 20, when the driver releases the clutch pedal 70, the clutch facing 23 of the clutch disc 22 is pressed against the flywheel 12 by the elastic force of the diaphragm spring 26, thereby switching from "disconnected" to "connected". It is supposed to be

In the present embodiment, in the clutch housing 21, a microphone 80 as a sound collector (sound collection unit) for acquiring the operation sound of the release bearing 27 is provided. The microphone 80 is, for example, a microphone with single directivity, sharp directivity, super directivity or the like that can easily capture sound incident from a specific direction, and can effectively collect the operation sound of the release bearing 27 In the direction of the release bearing 27. The microphone 80 is preferably fixed to the front cover portion 41 B of the transmission case 41 where the strength is most easily secured around the release bearing 27 so as not to be affected by disturbances such as vibration. The operation noise of the release bearing 27 collected by the microphone 80 is input to the electrically connected ECU 100.

The ECU 100 performs various controls of the vehicle 1 and includes a known CPU, ROM, RAM, input port, output port, and the like. Further, as shown in FIG. 2, the ECU 100 has an operating sound change rate calculation unit 110, a remaining life calculation unit 120, and a failure diagnosis unit 130 as a part of functional elements. Although each of these functional elements is described as being included in the ECU 100 which is an integral hardware, any part of these may be provided in a separate hardware.

The operation sound change rate calculation unit 110 calculates a change rate S% of the sound pressure level of the operation sound emitted from the release bearing 27. More specifically, the memory of the ECU 100 stores an operation sound map M (see FIG. 3) that defines the relationship between the frequency (kHz) of the operation sound of the release bearing 27 and the sound pressure level (dB). . In the operating sound map M, a faulty product operating sound line L _F having a peak value P _Max at the sound pressure level in a specific frequency region is set. The defective product operation sound line L _F is a value obtained by collecting the operation sound (an example of the reference operation sound) of the release bearing 27 of the defective product in advance by experiment or the like. For example, the operation noise emitted from the release bearing 27 of the defective product when the engine speed is increased by setting each gear of the transmission 40 to neutral with the clutch device 20 in contact. A sound or an operation sound emitted from the release bearing 27 of the defective product when the engine speed is increased with the clutch device 20 disconnected may be acquired by the microphone inserted in the clutch housing 21. The operating sound map M does not necessarily have to be stored graphically and may be stored as numerical data.

Operation sound change rate arithmetic unit 110 first peak value difference between the peak value P _N of the sound pressure level of the current collected by the operation sound, the peak value P _N-1 of the sound pressure level of the operation sound of the previously collected Calculate ΔP _N. Then, the operation sound change rate arithmetic unit 110 calculates the period travel distance [Delta] D _N from the difference between the travel distance D _N-1 and the travel distance D _N of the current time of pickup of the previous pickup. Then, the operating sound change rate calculation unit 110 divides the peak value difference ΔP _N by the period travel distance ΔD _N to obtain the peak value P of the current sound pressure level with respect to the previous peak value P _N−1 of the sound pressure level. _N rate of change _{_{_{S% N (= (P N}}} -P N-1) / (D N -D N-1)) for calculating a. The calculation of the change rate S% _N is not limited to the traveling distance, and may be performed based on the traveling time.

Remaining life calculation unit 120, the current change rate S% _N and, based on the difference between the peak value P _Max and the peak value P _N of the current collected by the sound pressure level fault product of the sound pressure level, the release bearing 27 The _drivable distance D _RN is calculated as the remaining life until the occurrence of a failure. More specifically, the remaining life calculation unit 120 divides a value obtained by subtracting the peak value P _N of the sound pressure level collected this time from the peak value P _Max of the defective product by the change rate S% _N. Thus, the travelable distance D _RN is calculated (D _RN = (P _Max −P _N ) / S% _N ). The calculation of the remaining life is not limited to the travel distance, and may be performed based on the travel time.

Based on the latest travelable distance D _RN calculated by the remaining life calculation unit 120, the failure diagnosis unit 130 carries out a failure diagnosis to determine whether or not there is a possibility of the occurrence of a failure in the release bearing 27. More specifically, when the latest remaining travelable distance D _RN becomes equal to or less than a predetermined threshold distance D _Min , the failure diagnosis unit 130 determines that the release bearing 27 may have a failure. The threshold distance D _Min is preferably set, for example, by securing a sufficient distance by which the vehicle 1 can reach the maintenance factory or the like by self-travel in order to replace the release bearing 27. If it is determined by the failure diagnosis unit 130 that there is a possibility of occurrence of a failure in the release bearing 27, the display 90 in the driver's cab indicates that the release bearing 27 needs to be replaced and / or the travelable distance D _RN . An instruction signal to be displayed is output. In addition, the method of alerting | reporting is not limited to the display to the indicator 90, You may carry out by the audio | voice by the speaker etc. which are not shown in figure.

Next, the diagnosis process of the present embodiment will be described based on the flowchart of FIG. The present control is started simultaneously with the ignition key ON operation of the engine 10.

At step S100, the peak value P _N of the sound pressure level of the current collected by the operation sound of the sound pressure level of the operation sound of the previously collected the peak value difference [Delta] P _N of the peak value P _N-1, the last collected Period of change in sound pressure level S% _N (= (P _N) by dividing by the period travel distance ΔD _N which is the difference between the travel distance D _{N -1} at the time and the travel distance D _N at the current sound collection. -P _N-1 ) / (D _N -D _{N -1} )) is calculated.

In step S110, a value obtained by subtracting the peak value P _N of the current sound pressure level from the peak value P _Max sound pressure level of fault products, divided by the rate of change S% _N, the release bearing 27 is A travelable distance D _RN (= (P _Max −P _N ) / S% _N ) until the failure is calculated.

In step S120, it is determined whether the travelable distance D _RN is less than or equal to a predetermined threshold distance D _Min . If the travelable distance D _RN is equal to or less than the predetermined threshold distance D _Min (positive), it is determined that the release bearing 27 has a possibility of occurrence of a failure, and the process proceeds to step S130 and the display 90 is replaced with the release bearing 27 And / or a notification to display the travelable distance D _RN is performed.

On the other hand, if it is determined in step S120 that the drivable distance D _RN is longer than the predetermined threshold distance D _Min (negative), the control is returned to step S100, and the drivable distance D _RN is less than the predetermined threshold distance D _Min . The processes of steps S100 to S120 are repeatedly executed until

As described above in detail, according to the diagnostic device and the diagnostic method of the present embodiment, the operation sound of the release bearing 27 which is hard to detect by the driver in the vehicle compartment is collected by the microphone 80, and the sound pressure of the operation sound By comparing the peak value of the level with the peak value of the sound pressure level of the operation noise of the defective product obtained in advance, the travelable distance until the failure occurs in the release bearing 27 is estimated and calculated. As a result, it is possible to effectively predict the occurrence of a failure of the release bearing 27, and it is possible to prevent the road failure of the vehicle 1 caused by the breakage of the release bearing 27 in advance.

Further, based on the degree of progress of deterioration of the release bearing 27 which changes according to the driver and the driving situation (the driving frequency, the magnitude of the load, etc.) by calculating the travelable distance based on the change rate of the most recent operating noise. The remaining life can be predicted with high accuracy, and it becomes possible to effectively grasp the occurrence of a failure of the different release bearing 27 for each vehicle or driver.

Note that the present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, in the above embodiment, the travelable distance until the failure of the release bearing 27 occurs is calculated, but the deterioration degree of the release bearing 27 is estimated from the rate of change of the operating noise of the release bearing 27 You may configure it.

Further, the clutch device 20 is not limited to the manual clutch device of the illustrated example, and any clutch device including the release bearing 27 can be widely applied to other clutch devices such as an automatic clutch device.

Further, the vehicle 1 is not limited to one including the engine 10 as a drive source, and may be a hybrid vehicle or the like including a traveling motor.

This application is based on the Japanese Patent Application (Japanese Patent Application No. 2017-167631) filed on August 31, 2017, the contents of which are incorporated herein by reference.

The present invention has the effect of being able to effectively predict the occurrence of a failure of a release bearing, and is useful for a diagnostic device, a diagnostic method and the like.

10 Engine 11 Crankshaft 20 Clutch Device 21 Clutch Housing 22 Clutch Disc 23 Clutch Facing 24 Clutch Cover 25 Pressure Plate 26 Diaphragm Spring 27 Release Bearing 28 Release Fork 40 Transmission 41 Transmission Case 41 B Front Cover Part 80 Microphone (Sound Collection Means)
90 Indicator (informing means)
100 ECU
110 Operating sound change rate calculation unit (fault diagnosis means)
120 Remaining life calculation unit (fault diagnosis means)
130 fault diagnosis unit (fault diagnosis means)

Claims

A diagnostic device of a release bearing of a clutch device capable of connecting and disconnecting power transmitted from a drive source mounted on a vehicle to a transmission,
Sound collecting means for acquiring an actual operation sound of the release bearing;
And a failure diagnosis unit that predicts the occurrence of a failure of the release bearing based on the actual operation sound acquired by the sound collection unit and the reference operation sound of the release bearing of the failed product acquired in advance. Diagnostic equipment.
The failure diagnosis means is capable of traveling a distance until a failure occurs in the release bearing based on a difference between a peak value of the sound pressure level of the reference operation sound and a peak value of the sound pressure level of the actual operation sound. Alternatively, the diagnosis device according to claim 1, wherein when the travelable time or the travelable time becomes equal to or less than a predetermined threshold, it is determined that the release bearing has a possibility of occurrence of a failure.
The failure diagnostic means determines the difference between the peak value of the sound pressure level of the actual operation sound collected this time and the peak value of the sound pressure level of the actual operation sound collected last time as the travel distance or travel time at the time of current collection. Calculate the rate of change of the actual operation sound from the previous sound collection to the current sound collection by dividing it by the period travel distance or period travel time obtained by subtracting the traveling distance or traveling time from the previous sound collection. The travelable distance or travelable time can be obtained by dividing the difference between the peak value of the sound pressure level of the reference operation sound and the peak value of the sound pressure level of the actual operation sound collected this time by the change rate The diagnostic device according to claim 2, which calculates
The microphone according to any one of claims 1 to 3, wherein the sound collecting means is a unidirectional, sharp directional or superdirective microphone, and the microphone is fixed to the front wall of the transmission. Diagnostic device as described.
The diagnostic device according to any one of claims 1 to 4, further comprising notification means for notifying the driver of the information when it is determined by the failure diagnosis means that there is a possibility of occurrence of a failure in the release bearing.
A diagnostic method of a release bearing of a clutch device capable of connecting and disconnecting power transmitted from a drive source mounted on a vehicle to a transmission,
A diagnosis characterized in that the occurrence of a failure of the release bearing is predicted on the basis of the actual operation noise of the release bearing and the reference motion sound of the release bearing of the failed product acquired in advance, while acquiring the actual operation noise of the release bearing. Method.
The diagnostic method is
Based on the difference between the peak value of the sound pressure level of the reference operation sound and the peak value of the sound pressure level of the actual operation sound, the travelable distance or travelable time until the failure of the release bearing occurs is calculated. Step to
Determining whether the travelable distance or the travelable time is equal to or less than a predetermined threshold value,
The diagnostic method according to claim 6, wherein when it is determined that the travelable distance or the travelable time is equal to or less than the predetermined threshold value, it is determined that the release bearing may have a failure.
The diagnostic method is
The difference between the peak value of the sound pressure level of the actual operation sound collected this time and the peak value of the sound pressure level of the actual operation sound collected last time from the traveling distance at the time of current collection or traveling time Calculating the rate of change of the actual operating sound from the previous sound collection to the current sound collection by dividing by the period travel distance or period travel time obtained by subtracting the travel distance or travel time;
In the step of calculating the travelable distance or the travelable time, a difference between the peak value of the sound pressure level of the reference operation sound and the peak value of the sound pressure level of the actual operation sound collected this time is divided by the change rate. Thereby calculating the travelable distance or the travelable time,
The diagnostic method according to claim 7.