KR20220130054A - Diagnosis device and diagnosis method for wheel bearing, and wheel bearing provided therewith - Google Patents

Abstract

According to an embodiment of the present invention, a diagnostic device for diagnosing whether a wheel bearing is broken or abnormally operated is provided. A diagnostic device for a wheel bearing according to an embodiment of the present invention comprises: a sensing unit for detecting information related to the operating state of a vehicle; and a diagnostic unit for diagnosing a wheel bearing based on the vehicle's operating state information detected by the sensing unit. According to an embodiment of the present invention, the sensing unit includes an acceleration sensor for detecting acceleration information. The acceleration sensor can be configured to detect acceleration in two or more axes, including acceleration in an axle axis and acceleration in an up-down direction of a vehicle. The diagnostic unit can be configured to diagnose the wheel bearing in a state in which the acceleration in an axle direction detected by the acceleration sensor is located within a range of ±0.3 G. The present invention can stably and reliably perform fault diagnosis on the wheel bearing.

Description

DIAGNOSIS DEVICE AND DIAGNOSIS METHOD FOR WHEEL BEARING, AND WHEEL BEARING PROVIDED THEREWITH

The present invention relates to a diagnosis apparatus and a diagnosis method used for diagnosing whether a wheel bearing is malfunctioning or malfunctioning, and a wheel bearing having the same, and more particularly, to a more reliable The present invention relates to a diagnostic apparatus and a diagnostic method for a wheel bearing configured to perform a diagnosis, and a wheel bearing having the same.

A wheel bearing is a device that rotatably mounts and supports the wheels of a vehicle on a vehicle body. It performs the function of being rotatably mounted on the vehicle body to support it.

However, since large loads and moments are applied in the radial and axial directions while the vehicle is running, such wheel bearings may be damaged due to flaking or other damage to the outer or inner rings supporting the rolling elements. , such damage may cause noise, vibration, heat, etc. or, in severe cases, may cause an accident in which the wheel bearing is seized or separated from the drive shaft.

In the past, chassis parts such as wheel bearings were not equipped with a diagnostic function to monitor the operation status of the parts, so drivers or mechanics had to intuitively judge the failures occurring in wheel bearings by detecting noise or vibration on their own.

However, such intuitive judgment has a problem in that it is difficult to perform an accurate diagnosis because there is a large difference in the judgment result depending on the skill level of the judge and the reliability of the judgment result cannot be guaranteed.

In order to solve this problem, recently, a technology for monitoring and diagnosing the operating state of a chassis component including a wheel bearing by attaching a sensor to the wheel bearing or the like has been proposed.

However, a vehicle as a means of transportation must be operated under various driving conditions (eg, straight driving, left turning, right turning, etc.). In the case of defective bearings, the amplitude of the defective frequency range changes according to the driving conditions, so the diagnosis of wheel bearings is diagnostic. When this is performed, different results may be derived depending on the driving state of the vehicle, and in some cases, there is a fear that an erroneous diagnosis result may be derived.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art, and includes a wheel bearing diagnosis apparatus and a diagnosis method configured to perform a more stable and reliable diagnosis while preventing erroneous diagnosis results from being derived by the driving state of a vehicle; An object of the present invention is to provide a wheel bearing having the same.

A representative configuration of the present invention for achieving the above object is as follows.

According to an embodiment of the present invention, there is provided a diagnostic apparatus for diagnosing whether a wheel bearing is malfunctioning or operating abnormally. A wheel bearing diagnosis apparatus according to an embodiment of the present invention may include a sensing unit for detecting information related to an operating state of a vehicle, and a diagnosis unit for diagnosing a wheel bearing based on the operating state information of the vehicle detected by the sensing unit. can According to an embodiment of the present invention, the sensing unit includes an acceleration sensor for detecting acceleration information, and the acceleration sensor is configured to detect an acceleration of two or more axes, including an acceleration along an axle direction and an acceleration along a vertical direction of the vehicle. In addition, the diagnostic unit may be configured to diagnose the wheel bearing in a state where the acceleration along the axle direction detected by the acceleration sensor is located within the range of ±0.3G.

According to an embodiment of the present invention, the diagnostic unit may be configured to diagnose the wheel bearing in a state where the acceleration along the vertical direction of the vehicle detected by the acceleration sensor is located within ±1G.

According to an embodiment of the present invention, the acceleration sensor may be configured to further detect an acceleration in the front-rear direction of the vehicle, and the diagnosis unit may determine that the acceleration in the front-rear direction detected by the acceleration sensor is within ±0.1G. It may be configured to diagnose the wheel bearing in a state located in the range of .

According to an embodiment of the present invention, the sensing unit may further include a wheel speed sensor for detecting the rotational speed of the wheel bearing, and the diagnosis unit is based on the acceleration information from the acceleration sensor and the speed information from the wheel speed sensor. can be configured to diagnose.

According to an embodiment of the present invention, the diagnosis unit may be configured to diagnose the wheel bearing based on acceleration information from an acceleration sensor and speed information provided from an ECU of the vehicle.

According to an embodiment of the present invention, the diagnosis unit may be configured to diagnose the wheel bearing based on acceleration information from the acceleration sensor and speed information calculated from the acceleration signal information.

According to an embodiment of the present invention, the speed information used for the diagnosis of wheel bearings is obtained by processing the acceleration signal detected by the acceleration sensor by root mean square (RMS), and then calculating the frequency having the peak RMS value of the wheel bearing. It can be calculated by considering the rotation frequency of

According to an embodiment of the present invention, there is provided a diagnostic method for diagnosing whether a wheel bearing is malfunctioning or operating abnormally. A method for diagnosing a wheel bearing according to an embodiment of the present invention includes the steps of collecting acceleration information of collecting acceleration information of a driving vehicle, collecting speed information of collecting speed information of a driving vehicle, and collecting acceleration information and speed It may include a diagnostic step of diagnosing the wheel bearing using the information. According to an embodiment of the present invention, in the step of collecting the acceleration information, the acceleration signal may be configured to collect two or more axes of acceleration information, including acceleration along the axle direction and acceleration along the vertical direction of the vehicle, and in the diagnosis step, the wheel Diagnosis of the bearing may be configured to be performed in a state where the acceleration along the axle direction is located within the range of ±0.3G.

According to an embodiment of the present invention, the diagnosis of the wheel bearing in the diagnosis step may be configured to be performed in a state where the acceleration along the vertical direction of the vehicle is located within the range of ±1G.

According to an embodiment of the present invention, acceleration information along the front-rear direction of the vehicle may be further collected in the step of collecting the acceleration information, and the diagnosis of the wheel bearing in the diagnosis step is performed when the acceleration along the front-rear direction of the vehicle is within ±0.1G. It may be configured to be performed in a state located in a range.

According to an embodiment of the present invention, in the speed information collection step, the speed information may be configured to be detected from the wheel speed sensor and provided.

According to an embodiment of the present invention, in the speed information collection step, the speed information may be configured to be provided from the ECU of the vehicle.

According to an embodiment of the present invention, in the speed information collection step, the speed information may be configured to be calculated by frequency analysis of the acceleration information from the acceleration sensor.

According to an embodiment of the present invention, the speed information is calculated by processing the acceleration signal detected by the acceleration sensor by root mean square (RMS), and then considering the frequency having the RMS peak value as the rotation frequency of the wheel bearing. can

According to one embodiment of the present invention, there is provided a wheel bearing for rotatably mounting and supporting a wheel of a vehicle on a vehicle body. A wheel bearing according to an embodiment of the present invention includes a rotating element on which a wheel is mounted, a non-rotating element fixed to a vehicle body, a plurality of rolling elements disposed between the rotating element and the non-rotating element, and the diagnostic device described above. can be configured to

In addition to this, the diagnostic apparatus and method for a wheel bearing according to the present invention and a wheel bearing having the same may further include other additional components within the scope of not impairing the technical spirit of the present invention.

A wheel bearing diagnosis apparatus and method according to an embodiment of the present invention and a wheel bearing having the same are provided in a state in which an acceleration signal detected through an acceleration sensor is located in a predetermined range (for example, the acceleration along the axle direction is ± It is configured to diagnose wheel bearing failure or abnormal operation (in the state within the range of 0.3G). And it is possible to reliably perform fault diagnosis on wheel bearings.

1 exemplarily shows a wheel bearing having a diagnostic device according to an embodiment of the present invention.
FIG. 2 exemplarily shows a cross-sectional structure of the wheel bearing shown in FIG. 1 .
3 exemplarily shows a partial structure of a diagnostic apparatus according to an embodiment of the present invention.
4 exemplarily shows a block diagram conceptually illustrating a technical configuration of a diagnostic apparatus according to an embodiment of the present invention.
5 exemplarily illustrates a process of diagnosing a wheel bearing using a diagnostic apparatus according to an embodiment of the present invention.
6 and 7 exemplarily show the relationship between the defective position and the load position according to the turning state of the vehicle in the defective bearing and the amplitude change in the frequency domain accordingly.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail enough to be easily implemented by a person skilled in the art to which the present invention pertains.

In order to clearly describe the present invention, detailed descriptions of parts not related to the present invention will be omitted, and the same components will be described with the same reference numerals throughout the specification. In addition, since the shape and size of each component shown in the drawings are arbitrarily illustrated for convenience of description, the present invention is not necessarily limited to the illustrated shape and size. That is, specific shapes, structures, and characteristics described in the specification can be implemented by being modified from one embodiment to another without departing from the spirit and scope of the present invention, and the position or arrangement of individual components is also the spirit of the present invention. and it should be understood that changes may be made without departing from the scope. Therefore, the detailed description given below is not intended to be limiting, and the scope of the present invention should be taken as encompassing the scope of the claims and all equivalents thereto.

1 to 7 , an apparatus and method for diagnosing a wheel bearing according to an embodiment of the present invention and a wheel bearing having the same are illustrated by way of example. As will be described later, a wheel bearing diagnosis apparatus and method according to an embodiment of the present invention and a wheel bearing having the same are provided in a state in which the acceleration of the vehicle detected through the acceleration sensor is located within a predetermined range (that is, the vehicle It is configured to diagnose whether the wheel bearing is malfunctioning or abnormal operation (when the driving condition of It is characterized in that it is configured to perform a diagnosis.

First, looking at the overall structure of the wheel bearing 10 having the diagnostic device according to an embodiment of the present invention, the wheel bearing 10 according to an embodiment of the present invention includes a rotating element on which a wheel is mounted is coupled to a vehicle body. It may be connected to the non-rotating element through a rolling element to perform a function of rotatably supporting the wheel with respect to the vehicle body. For example, in the wheel bearing 10 according to an embodiment of the present invention, as shown in FIGS. 1 and 2 , a rotating element composed of a wheel hub 20 and an inner ring 30 is a non-rotating element composed of an outer ring 40 . It may be configured to be rotatably mounted through the rolling element 50 with respect to the.

According to an embodiment of the present invention, the wheel hub 20 may be formed in a structure of a substantially cylindrical shape extending along the axial direction, and a wheel-side mounting flange (hub flange) is located near the wheel-side end of the wheel hub 20 . ) may be provided. The wheel-side mounting flange is formed in a shape extending radially outward from the outer circumferential surface of the wheel hub 20 , and may be used to mount a wheel and/or a brake disc to the wheel hub 20 , which is a rotating element. On the other hand, a step portion is formed at the end of the vehicle body side of the wheel hub 20 to be configured to mount the inner ring 30, and a raceway surface (inner raceway surface) is formed on a part of the outer circumferential surface of the wheel hub 20 to form a rolling element ( 50) may be configured to support radially inwardly. However, in the case of the embodiment shown in the drawings, one raceway surface for supporting the rolling element is directly formed on a part of the outer circumferential surface of the wheel hub. It may be modified and implemented in any other arbitrary structure, such as configured to form a raceway surface (inner raceway surface) of a rolling element through two inner rings by mounting two inner rings.

According to an embodiment of the present invention, one or more inner rings 30 may be press-fitted and mounted on one side of the wheel hub 20 . For example, the inner ring 30 is plastically deformed as shown in FIG. 2 on the end of the wheel hub 20 in a state in which the inner ring 30 is press-fitted into the stepped portion formed at the end of the vehicle body side of the wheel hub 20, or It may be configured to be seated and maintained on the wheel hub 20 by fastening a nut or the like to the end of the vehicle body. In addition, the outer peripheral surface of the inner ring 30 may be provided with a raceway surface (inner raceway surface) in contact with the rolling element 50 to support the rolling element from the inside in the radial direction.

According to one embodiment of the present invention, the outer ring 40 is provided with a vehicle body side mounting flange for mounting the wheel bearing 10 to the vehicle body on the outer peripheral surface, and the raceway surface (outer raceway) in contact with the rolling element 50 on the inner peripheral surface surface) may be configured to have. The raceway surface (outer raceway) formed on the inner circumferential surface of the outer ring 40 cooperates with the raceway surface (inner raceway) formed on the wheel hub 20 and/or the inner race 30, and the rolling element (rolling element) between the raceway surfaces 50) may be configured to receive and support.

According to an embodiment of the present invention, the rolling element 50 is disposed between the rotating element (eg, the wheel hub 20 and the inner ring 30) and the non-rotating element (eg, the outer ring 40), the rotating element can perform a function of supporting by being rotatably mounted with respect to the non-rotating element.

However, the wheel bearing 10 shown in FIGS. 1 and 2 is exemplarily shown to explain the failure diagnosis apparatus and the failure diagnosis method according to the present invention, and the failure diagnosis apparatus and the failure diagnosis method according to the present invention are In addition to the wheel bearings shown in FIGS. 1 and 2 , they may be used by being mounted on wheel bearings of various other structures.

Meanwhile, according to an exemplary embodiment of the present invention, the wheel bearing 10 may further include a diagnostic device 60 for diagnosing whether the wheel bearing 10 is malfunctioning or operating abnormally.

According to an embodiment of the present invention, the diagnostic device 60 of the wheel bearing 10 includes a sensing unit 70 that detects an operating state of the vehicle and an operation detected by the sensing unit 70 as shown in FIG. 4 . The diagnostic unit 80 for diagnosing wheel bearings based on state information (eg, acceleration information, speed information, etc.) may be included.

According to an embodiment of the present invention, the sensing unit 70 may be provided with an acceleration sensor 72 for detecting vehicle acceleration information. For example, as shown in FIGS. 1 and 3 , the acceleration sensor 72 may be mounted on the outer wheel 40 of the wheel bearing 10 and configured to detect acceleration information of a driving vehicle.

According to an embodiment of the present invention, the acceleration sensor 72 may be configured to detect acceleration information on at least two axes, including acceleration along the vertical direction (vertical acceleration) and acceleration along the axle direction of the vehicle. . For example, the acceleration information along the vertical direction of the vehicle determines whether the wheel bearing is malfunctioning or abnormally operates through frequency analysis, etc. used for general wheel bearing diagnosis, or as a diagnostic condition for performing wheel bearing diagnosis (e.g., while driving). It can be used to set the road surface condition of the road, etc.), and the acceleration along the axle direction can be used to set basic diagnostic conditions (eg, turning conditions of a vehicle, etc.) for performing the diagnosis of wheel bearings as will be described later. have. For example, according to an embodiment of the present invention, the acceleration sensor 72 may be formed as a 3-axis MEMS acceleration sensor capable of measuring acceleration along the axle direction, the vertical direction of the vehicle, and the front-rear direction of the vehicle.

According to an embodiment of the present invention, the diagnosis unit 80 of the failure diagnosis apparatus 60 may receive the signal information obtained through the detection unit 70 and perform a function of diagnosing the state of wheel bearings. For example, the diagnosis unit 80 performs wheel bearings using the first input/output unit 82 receiving the signal detected from the detection unit 70 and signal information (eg, acceleration signal information) transmitted from the first input/output unit 82 . A control unit 84 for diagnosing the state of the back, a memory unit 86 for storing reference data or a diagnosis/analysis result, etc., and a second input/output unit 88 for outputting a diagnosis result from the control unit 84 and the like.

According to an embodiment of the present invention, if the diagnosis unit 80 diagnoses the wheel bearing and it is diagnosed that there is a malfunction or abnormal operation in the wheel bearing, the diagnosis result is returned to the memory unit 86 provided in the diagnosis device 60 . ) or the ECU (Electronic Control Unit) of the vehicle and stored, or displayed to the user through the display unit 92 such as a warning sound or display, or transmitted to the driving unit 94 to control the driving unit such as chassis parts. can be used

Meanwhile, since the defect frequency of the wheel bearing may vary depending on the speed, in order to accurately diagnose whether the wheel bearing is malfunctioning or operating abnormally, it is necessary to perform the diagnosis by considering not only the acceleration information but also the speed information.

For example, the frequency of defects in the inner ring, outer ring, rolling element, etc. constituting the wheel bearing is changed according to the rotation frequency related to the rotation speed as follows.

Inner ring:

paddle:

Rolling element:

는 내륜의 결함 주파수,

는 외륜의 결함 주파수,

는 전동체의 결함 주파수,

은 축의 회전 주파수,

는 전동체의 수,

는 전동체의 직경,

는 전동체의 피치원 직경,

는 전동체의 접촉각을 의미함][

is the fault frequency of the inner ring,

is the fault frequency of the outer ring,

is the fault frequency of the rolling element,

is the rotation frequency of the axis,

is the number of rolling elements,

is the diameter of the rolling element,

is the pitch circle diameter of the rolling element,

is the contact angle of the rolling element]

Accordingly, in order to perform a more accurate diagnosis, the diagnosis apparatus 60 according to an embodiment of the present invention includes a wheel speed sensor 74 (WSS; Wheel Speed Sensor) on one side and transmits the wheel speed sensor 74 through the wheel speed sensor 74 . It may be configured to diagnose wheel bearings by detecting the rotational speed of the wheel and then providing it to the diagnostic device 60 in consideration of both the acceleration information from the acceleration sensor 72 and the speed information from the wheel speed sensor 74 .

For example, the wheel speed sensor 74 may be configured in the same manner as a conventional wheel speed sensor used for wheel bearings, and the speed sensor provided therein faces the sensor target mounted on the rotating element of the wheel bearing 10 . It may be arranged adjacent to one side of the wheel bearing to detect a change in the magnetic field generated by the rotation of the sensor target to detect the rotational speed of the wheel.

According to another embodiment of the present invention, the wheel bearing diagnosis device 60 is configured to receive information about the vehicle speed from the ECU (Electronic Control Unit) of the vehicle instead of the wheel speed sensor and diagnose the wheel bearing based on this information. may be

In addition, according to another embodiment of the present invention, the wheel bearing diagnosis apparatus 60 receives speed information based on the acceleration information detected by the acceleration sensor 72 without receiving additional speed information from the wheel speed sensor or ECU. It may be configured to calculate and then use this to diagnose wheel bearings.

For example, a unique rotation frequency according to rotation is generated in wheel bearings during vehicle operation. At this rotation frequency, an acceleration signal of the vehicle exhibits a large amplitude value. Accordingly, in the diagnostic apparatus 60 according to an embodiment of the present invention, the speed information is obtained by processing the acceleration signal detected through the acceleration sensor 72 by root mean square (RMS) and then calculating the RMS peak value therefrom. It may be configured to extract a frequency having a frequency and calculate it by considering it as a rotation frequency.

For example, in the diagnostic apparatus and method according to an embodiment of the present invention, the amplitude is measured for each time through an acceleration sensor, the measured amplitude is frequency-converted (FFT-converted) for each time, and extracted in Hz units and from the extracted data. The frequency with the RMS peak value is searched for, regarded as the rotation frequency, and then the rpm of the wheel is calculated by inverse calculation (eg, rpm of the wheel = rotation frequency x 60), and the speed of the vehicle is calculated by inversely calculating the calculated rpm (eg, vehicle speed = wheel rpm x 2π x tire companion diameter x 60/1000000), etc., to calculate speed information (eg, wheel rotation speed, vehicle running speed, etc.) from the detected acceleration information. can

In this way, if speed information is calculated based on the acceleration information detected by the acceleration sensor 72 without receiving additional speed information from the outside in this way and wheel bearings are diagnosed using this, the speed information is sent from the acceleration sensor for the diagnosis of wheel bearings. The signal from the speed sensor and the signal from the speed sensor are transmitted together to the diagnostic device, eliminating the need to link them together, making it possible to further simplify the configuration of the diagnostic device and wheel bearings. In addition, as shown in FIGS. 1 to 3, a diagnostic device for wheel bearings can be implemented by mounting only an acceleration sensor at an arbitrary position, such as the outer surface of the outer ring fixed to the vehicle body, so that the diagnostic device for wheel bearings is easier It can be implemented in a simple manner, and the degree of freedom in the design of wheel bearings can be further improved.

According to an embodiment of the present invention, the diagnosis of a malfunction of a wheel bearing based on acceleration information and speed information may be configured to be performed through the following process. (See Fig. 5)

First, according to an embodiment of the present invention, acceleration information and speed information to be used for fault diagnosis may be collected in order to perform fault diagnosis such as wheel bearings (S110). When the acceleration information and the speed information are collected in this way, it is determined whether the vehicle satisfies a predetermined driving condition based on the collected signal information (S120), and when the driving condition does not satisfy the predetermined requirement, a signal collection step Return to to collect acceleration information and speed information again, and when the driving condition satisfies a predetermined requirement, it may be configured to proceed to a subsequent step to perform a fault diagnosis (S130).

According to an embodiment of the present invention, in the signal collecting step (S110) of collecting the acceleration and speed information, the acceleration information may be configured to be detected through the acceleration sensor 72 provided on one side of the wheel bearing 10, The speed information may be configured to be provided from the wheel speed sensor 74 disposed on one side of the wheel bearing or the ECU of the vehicle, or it may be configured to be calculated by frequency analysis of the acceleration information detected from the acceleration sensor 72 as described above.

On the other hand, in the condition determination step (S120) of determining whether the driving state of the vehicle is a state suitable for diagnosing the failure of the wheel bearing, whether the driving condition is satisfied is performed based on the acceleration information detected through the acceleration sensor 72 can be configured. For example, the driving condition for performing the diagnosis of the failure of the wheel bearing is set based on whether the acceleration along the axle direction is located within ±0.3G, so that the diagnosis of the wheel bearing is performed in a state in which the vehicle does not make a sharp turn. . Meanwhile, in order to perform more reliable diagnosis, the driving conditions for performing wheel bearing failure diagnosis are whether the acceleration along the vertical direction of the vehicle is located within ±1G and/or the acceleration along the front-rear direction of the vehicle is within ±0.1G. By adding a reference condition such as location, the wheel bearing diagnosis may be performed in a state where the vehicle does not drive on a rough road or accelerate/decelerate rapidly.

As described above, since the wheel bearing diagnosis apparatus and method according to an embodiment of the present invention are configured to perform the wheel bearing failure diagnosis in a state where the vehicle satisfies a predetermined driving condition, the wheel bearing failure diagnosis is performed on the vehicle. It is possible to prevent the risk of erroneous results being influenced by the driving condition of the vehicle.

In particular, since the diagnosis apparatus and the diagnosis method according to an embodiment of the present invention are configured to perform a fault diagnosis of a wheel bearing while the acceleration along the axle direction is located within a predetermined range (within ±0.3G), the wheel bearing It is possible to derive reliable diagnostic results while minimizing the influence of the turning state, which has a great influence on the misdiagnosis of bearings.

For example, as shown in FIG. 6 , in the case of a defective bearing in which a defect occurs in the inner raceway of the outboard side rolling element and/or the outer raceway surface of the inboard side rolling element of the wheel bearing, the load position (Y) is Whereas it coincides with the defect position (X) [the left state shown in Fig. 6 (a)], in the right turn, the load position (Y) and the defect position (X) are formed opposite to each other [Fig. 6(a)) right state shown in ], and accordingly, the amplitude of the frequency domain according to the driving state changes in the form of a (-) exponential function as shown in (b) of FIG. 6 .

On the other hand, as shown in FIG. 7 , in the case of a defective bearing in which a defect occurs in the outer raceway of the outboard side rolling element and/or the outer raceway surface of the inboard side rolling element of the wheel bearing, the load position (Y) at right turn is coincident with the defect position (X) (right state shown in Fig. 7 (a)), while turning left, the load position (Y) and the defect position (X) are formed opposite to each other [Fig. 7 (a) left state shown in )], and accordingly, the amplitude of the frequency domain according to the driving state is changed in the form of a (+) exponential function as shown in (b) of FIG. 7 .

As such, in the defective bearing, the amplitude of the defective frequency region varies greatly depending on the turning state of the vehicle, so different diagnosis results may be derived depending on the driving condition, and in severe cases, there is a risk of erroneous diagnosis results.

On the other hand, the diagnostic device according to an embodiment of the present invention is configured to diagnose a wheel bearing failure in a turning condition of a vehicle with a small amplitude change (a state in which the acceleration along the axle direction is located within ±0.3G). , it is possible to minimize erroneous diagnosis results due to the turning state of the vehicle, and to perform stable and reliable diagnosis of wheel bearings.

In the above, the present invention has been described through specific matters such as specific components and limited embodiments and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , those of ordinary skill in the art to which the present invention pertains will be able to devise various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and all modifications as well as the claims described below as well as equivalently or equivalently modified ones should be construed as belonging to the scope of the spirit of the present invention.

10: wheel bearing
20: wheel hub
30: inner ring
40: paddle
50: rolling element
60: diagnostic device
70: sensing unit
72: acceleration sensor
74: wheel speed sensor
80: diagnostic unit
82: first input/output unit
84: control unit
86: memory unit
88: second input/output unit
90: ECU of vehicle
92: display unit
94: drive unit

Claims (15)

It is a diagnostic device (60) for diagnosing whether a wheel bearing is malfunctioning or operating abnormally,
A sensing unit 70 for detecting information related to the operating state of the vehicle;
and a diagnostic unit 80 for diagnosing wheel bearings based on the operating state information of the vehicle detected by the sensing unit 70,
The sensing unit 70 includes an acceleration sensor 72 for detecting acceleration information,
The acceleration sensor 72 is configured to detect two or more axes of acceleration, including acceleration along the axle direction and acceleration along the vertical direction of the vehicle,
The diagnosis unit 80 is configured to diagnose the wheel bearing in a state where the acceleration along the axle direction detected by the acceleration sensor 72 is located within the range of ±0.3G,
Diagnosis device for wheel bearings. According to claim 1,
The diagnosis unit 80 is configured to diagnose wheel bearings in a state where the acceleration along the vertical direction of the vehicle detected by the acceleration sensor 72 is located within ±1G,
Diagnosis device for wheel bearings. 3. The method of claim 2,
The acceleration sensor 72 is configured to further detect an acceleration along the front-rear direction of the vehicle,
The diagnosis unit 80 is configured to diagnose wheel bearings in a state where the acceleration along the front-rear direction of the vehicle detected by the acceleration sensor 72 is located within the range of ±0.1G,
Diagnosis device for wheel bearings. According to claim 1,
The sensing unit 70 further includes a wheel speed sensor 74 for detecting the rotational speed of the wheel bearing,
the diagnostic unit 80 is configured to diagnose wheel bearings based on acceleration information from an acceleration sensor 72 and speed information from a wheel speed sensor 74;
Diagnosis device for wheel bearings. According to claim 1,
The diagnosis unit 80 is configured to diagnose wheel bearings based on acceleration information from the acceleration sensor 72 and speed information provided from the ECU of the vehicle.
Diagnosis device for wheel bearings. According to claim 1,
The diagnosis unit 80 is configured to diagnose wheel bearings based on acceleration information from the acceleration sensor 72 and speed information calculated from the acceleration information.
Diagnosis device for wheel bearings. 7. The method of claim 6,
The speed information used for diagnosing the wheel bearing is calculated by processing the acceleration signal detected by the acceleration sensor 72 by root mean square (RMS), and then calculating the frequency with the RMS peak value as the rotation frequency of the wheel bearing. felled,
Diagnosis device for wheel bearings. It is a diagnostic method for diagnosing whether a wheel bearing is malfunctioning or operating abnormally,
An acceleration information collection step of collecting acceleration information of a driving vehicle;
A speed information collection step of collecting speed information of a driving vehicle;
a diagnostic step of diagnosing wheel bearings using the collected acceleration information and speed information;
In the acceleration information collection step, the acceleration signal is configured to collect acceleration information on two or more axes, including acceleration along the axle direction and acceleration along the vertical direction of the vehicle,
In the diagnosis step, the diagnosis of the wheel bearing is configured to be performed in a state where the acceleration along the axle direction is located within the range of ±0.3G,
Diagnosis of wheel bearings. 9. The method of claim 8,
In the diagnosis step, the diagnosis of wheel bearings is configured to be performed in a state where the acceleration along the vertical direction of the vehicle is located within ±1G,
Diagnosis of wheel bearings. 10. The method of claim 9,
In the acceleration information collection step, acceleration information along the front-rear direction of the vehicle is further collected,
The diagnosis of the wheel bearing in the diagnosis step is configured to be performed in a state where the acceleration along the front-rear direction of the vehicle is located within the range of ±0.1G,
Diagnosis of wheel bearings. 9. The method of claim 8,
The speed information in the speed information collection step is configured to be detected and provided from the wheel speed sensor (74),
Diagnosis of wheel bearings. 9. The method of claim 8,
In the speed information collection step, the speed information is configured to be provided from the ECU of the vehicle,
Diagnosis of wheel bearings. 9. The method of claim 8,
The speed information in the speed information collection step is configured to be calculated by frequency analysis of the acceleration information from the acceleration sensor 72,
Diagnosis of wheel bearings. 14. The method of claim 13,
The speed information is calculated by processing the acceleration signal detected by the acceleration sensor 72 by root mean square (RMS), and then considering the frequency having the RMS peak value as the rotation frequency of the wheel bearing,
Diagnosis of wheel bearings. It is a wheel bearing (10) that rotatably mounts and supports the wheel of the vehicle on the vehicle body,
a rotating element on which the wheel is mounted;
a non-rotating element fixed to the vehicle body;
a plurality of rolling elements disposed between the rotating element and the non-rotating element;
A diagnostic device according to any one of claims 1 to 7, comprising:
wheel bearings.

Images