KR20220165683A - Road condition diagnosis system and wheel bearing provided therewith - Google Patents

Abstract

According to one embodiment of the present invention, provided is a road condition diagnosis system used to diagnose a road condition of a road while driving. According to one embodiment of the present invention, the road condition diagnosis system may include a sensing unit detecting information related to an operation condition of a vehicle, and a diagnosis unit diagnosing a road condition of a road while driving based on the operation condition information of the vehicle detected from the sensing unit. According to one embodiment of the present invention, the sensing unit may include a rotation speed sensing unit detecting a rotation speed of a wheel and an acceleration sensing unit detecting acceleration information of a vehicle. The diagnosis unit may be configured to mutually compare rotation speed-related information detected from the sensing unit and acceleration-related information in a driving direction detected from the acceleration sensing unit to diagnose a road condition of a road while driving.

Description

Road condition diagnosis system and wheel bearing having the same {ROAD CONDITION DIAGNOSIS SYSTEM AND WHEEL BEARING PROVIDED THEREWITH}

The present invention relates to a road surface condition diagnosis system for diagnosing the road surface condition of a driving road and a wheel bearing having the same, and more particularly, to a road surface condition diagnosis system capable of reliable diagnosis of the road surface condition in a simple manner and a wheel bearing having the same It is about.

Recently, vehicles are equipped with various control systems to improve drivability and stability, and various sensors are mounted and used to provide information on the operating state of the vehicle to these control systems.

For example, a vehicle has an Anti-Lock Brake System (ABS) that prevents the vehicle from slipping by locking the wheels during sudden braking, and the slip of the driving wheels by adjusting the engine torque according to the frictional force with the road surface. The Traction Control System (TCS), which prevents and improves driving stability, and the Electronic Stability Control (ESC), which stabilizes the vehicle's driving posture by controlling the brake hydraulic pressure and engine torque applied to each wheel while the vehicle is driving ) etc. are provided and used for control of drivability and stability.

However, since the vehicle must be driven on roads with various road conditions, in order to more stably control the vehicle using a control system, it is necessary to detect the road surface conditions of the road on which it is running and reflect this information in control.

For example, when a vehicle drives or turns on a road with slippery road conditions, in order to stably control the posture and driving of the vehicle, the torque and braking force applied to each wheel of the vehicle must be redistributed and provided to appropriate values. To this end, the control system It is necessary to provide information related to the condition of the road surface (eg, friction coefficient of the road surface).

For this reason, recently, a technique for diagnosing the road surface condition of a driving road and providing information thereof to a user or a control system of a vehicle has been proposed. For example, referring to Patent Document 1, a technique for diagnosing the road surface condition of a road on the basis of an acceleration signal detected from a vehicle in motion is disclosed.

Specifically, the conventional road surface condition diagnosis system 10 disclosed in Patent Document 1, as shown in FIG. The sensor 50 is attached to detect the acceleration in the vertical direction (up and down direction) of the vehicle generated during driving through the acceleration sensor 50 and provide it to the evaluation unit 60 to diagnose the road surface condition of the driving road, The road surface condition of the road being driven is configured to calculate the frequency spectrum by FFT analysis of the vertical acceleration signal detected through the acceleration sensor, identify the local maximum value in the calculated frequency spectrum, and judge based on the maximum value of the identified frequency spectrum. do.

However, since this conventional road surface condition diagnosis system is configured to determine the road surface condition by frequency analysis of an acceleration signal detected through an acceleration sensor, a frequency analysis of a complex algorithm must be performed to determine the road surface condition, and thus the road surface condition is determined. There is a problem that the configuration of the diagnosis system becomes complicated.

In addition, since the frequency spectrum calculated through frequency analysis can be implemented in various modes, when the road condition is diagnosed based only on the frequency information calculated by frequency analysis of the acceleration signal as in the conventional road condition diagnosis system described above There is a problem that it is difficult to guarantee high reliability of diagnosis results.

U.S. Patent No. 8,437,907 (registration date: 2013.05.07.)

The present invention is intended to solve the above-mentioned problems of the prior art, and compares wheel rotational speed-related information detected from the rotational speed sensing unit and vehicle acceleration-related information detected from the acceleration sensing unit to compare the road surface conditions of the driving road. It is an object of the present invention to provide a road surface condition diagnosis system configured to diagnose simply and reliably and a wheel bearing having the same.

Representative configurations of the present invention for achieving the above object are as follows.

According to one embodiment of the present invention, a road surface condition diagnosis system used to diagnose the road surface condition of a driving road is provided. A road surface condition diagnosis system according to an embodiment of the present invention includes a sensing unit for detecting information related to the operating state of a vehicle, and diagnosis for diagnosing the road surface condition of a driving road based on the operating state information of the vehicle detected by the sensing unit. wealth may be included. According to an embodiment of the present invention, the sensing unit includes a rotational speed sensing unit that detects a rotational speed of a wheel and an acceleration sensing unit that detects acceleration information of a vehicle, and the diagnosis unit includes rotational speed-related information detected from the rotational speed sensing unit and It may be configured to diagnose the road surface condition of the road in which driving is performed by comparing information related to acceleration in the driving direction detected by the acceleration sensing unit.

According to an embodiment of the present invention, the diagnosis unit performs a differential operation with respect to time and a conversion operation of the rotational speed information of the wheel detected by the rotational speed sensing unit and the conversion operation into driving direction information, and the driving direction acceleration information and the acceleration sensing unit It may be configured to diagnose the road surface condition of the driving road by comparing the detected driving direction acceleration information with each other.

According to an embodiment of the present invention, the diagnosis unit performs an integration operation with respect to time and a conversion operation into rotation direction information of the driving direction acceleration information detected by the acceleration sensing unit, and the rotational speed information calculated and the rotational speed information detected by the rotational speed sensing unit It may be configured to diagnose the road surface condition of the driving road by comparing the rotational speed information with each other.

According to an embodiment of the present invention, the diagnostic unit converts the rotational acceleration information calculated by differentiating the rotational speed information of the wheel detected by the rotational speed sensing unit with respect to time and the driving direction acceleration information detected by the acceleration sensing unit as rotational direction information. It may be configured to diagnose the road surface condition of the driving road by comparing rotational acceleration information calculated by converting to .

According to an embodiment of the present invention, the diagnosis unit converts the rotational speed information of the wheel detected by the rotational speed sensing unit into driving direction information and converts the calculated driving direction speed information and the driving direction acceleration information detected by the acceleration sensing unit into time It may be configured to diagnose the road surface condition of the road being driven by mutually comparing driving direction speed information calculated by integrating for .

According to an embodiment of the present invention, in the road surface condition diagnosis system, wheel slip occurs when the rotational speed related signal from the rotational speed sensing unit and the driving direction acceleration related signal from the acceleration sensing unit match within a predetermined range. It is determined that it is not, and when the rotational speed related signal from the rotational speed sensing unit and the driving direction acceleration related signal from the acceleration sensing unit are located out of a predetermined range, it is determined that wheel slip has occurred.

According to an embodiment of the present invention, the road surface condition diagnosis system may be configured to determine that the road surface condition of the driving road is a slippery road condition when wheel slip occurs a predetermined number of times or more within a predetermined time period.

According to an embodiment of the present invention, the road surface condition information determined by the road surface condition diagnosis system may be transmitted to and stored in a storage unit, displayed to a user through a display unit, or used to control a driving device.

According to one embodiment of the present invention, road surface condition information determined by the road surface condition diagnosis system may be configured to be stored together with location information where the road surface condition is detected.

According to an embodiment of the present invention, the road condition information determined by the road condition diagnosis system may be configured to be stored together with location information at which the road condition is detected and time information at the point in time at which the road condition is detected.

According to an embodiment of the present invention, the road condition diagnosis system may be configured to display corresponding information to a user when driving on a road stored as a slippery road.

According to one embodiment of the present invention, the road surface condition diagnosis system may be configured to automatically control the driving condition of the vehicle in a state suitable for the slippery road surface when driving on a road stored as a slippery road surface.

According to an embodiment of the present invention, a wheel bearing for supporting a wheel of a vehicle by being rotatably mounted on a vehicle body may be provided. can be configured.

In addition to this, other additional components may be further included in the road surface condition diagnosis system and the wheel bearing having the same according to the present invention without impairing the technical spirit of the present invention.

A road surface condition diagnosis system and a wheel bearing having the same according to an embodiment of the present invention compare information related to the rotational speed of a wheel detected from a rotational speed sensing unit and information related to acceleration in the driving direction of a vehicle detected from an acceleration sensing unit to drive. It is configured to diagnose the road surface condition of the road in progress, so that more reliable diagnosis of the road surface condition is possible, and furthermore, it becomes possible to implement a road condition diagnosis system with a simpler structure and algorithm compared to the prior art.

1 exemplarily shows an example of a conventional road surface condition diagnosis system.
2 exemplarily shows a wheel bearing having a road surface condition diagnosis system according to an embodiment of the present invention.
FIG. 3 exemplarily shows a cross-sectional structure of the wheel bearing shown in FIG. 2 .
4 illustratively illustrates the structure of an acceleration sensing unit constituting a road condition diagnosis system according to an embodiment of the present invention.
5 exemplarily shows a schematic configuration diagram of a road condition diagnosis system according to an embodiment of the present invention.
6 is the rotational speed information of the wheel detected by the rotational speed sensing unit (wheel speed sensor) in the road surface condition diagnosis system according to an embodiment of the present invention (FIG. 6(a)) and Driving direction acceleration information (FIG. 6(b)) calculated by differentiating and converting into driving direction information is shown as an example.
FIG. 7 illustratively illustrates vehicle driving direction acceleration information detected through an acceleration sensing unit in the road surface condition diagnosis system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail so that those skilled in the art can easily practice it.

In order to clearly describe the present invention, detailed descriptions of parts not related to the present invention will be omitted, and the same reference numerals will be given to the same components throughout the specification. In addition, since the shape and size of each component shown in the drawings are arbitrarily shown 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 may be modified and implemented from one embodiment to another without departing from the spirit and scope of the present invention, and the location or arrangement of individual components may also be implemented without departing from the spirit and scope of the present invention. and can be changed without departing from its scope. Therefore, the detailed description to be described later is not performed in a limiting sense, and the scope of the present invention should be taken as encompassing the scope claimed by the claims and all scopes equivalent thereto.

Road condition diagnosis system and wheel bearing according to an embodiment of the present invention

Referring to FIGS. 2 to 7 , a road surface condition diagnosis system and a wheel bearing having the same according to an embodiment of the present invention are exemplarily shown. As will be described later, the road condition diagnosis system according to an embodiment of the present invention and the wheel bearing having the same include information related to the rotational speed of the wheel detected by the rotational speed sensing unit and information related to acceleration in the driving direction of the vehicle detected by the acceleration sensing unit. It is characterized in that it is configured to diagnose the road surface condition of the road being driven by comparing with each other in a simple and reliable way.

First, looking at the structure of the wheel bearing 100 having the road surface condition diagnosis system according to an embodiment of the present invention, the wheel bearing 100 according to an embodiment of the present invention is a rotating element similar to a conventional wheel bearing. 110 is rotatably mounted to the non-rotating element 140 through the rolling element 150 so that the wheel mounted on the rotating element 110 is rotatably supported by the non-rotating element 140 fixed to the vehicle body. can be configured.

According to one embodiment of the present invention, the rotating element 110 may include a wheel hub 120 to which a wheel of a wheel is mounted and an inner ring 130 press-fitted and mounted to the wheel hub 120, The rotating element 140 may be composed of an outer wheel or the like that is coupled to chassis components of the vehicle and fixed to the vehicle body. However, the wheel bearing according to an embodiment of the present invention does not have to be limited to this structure and may be formed in various other structures that can be applied to normal wheel bearings.

According to one embodiment of the present invention, the wheel hub 120 constituting the rotation element 110 may be formed in a substantially cylindrical shape extending along the axial direction, and a wheel side is mounted on one outer circumferential surface of the wheel hub 120. A flange 122 (hub flange) may be provided. The wheel-side mounting flange 122 is formed in a shape extending radially outward from the wheel hub 120 and may be used to mount a wheel and/or a brake disc of a wheel through a bolt member or the like. Meanwhile, the inner ring 130 may be mounted on an end portion of the wheel hub 120 on the vehicle body side, and a raceway surface (inner raceway surface) is formed on a part of the outer circumferential surface of the wheel hub 120 to move the rolling elements 150 along the radius. It can be configured to support inside the direction.

According to one embodiment of the present invention, one or more inner rings 130 may be configured to be mounted by being press-fitted to the outer circumferential surface of the wheel hub 120 . For example, in a state where the inner wheel 130 is press-fitted to and mounted on the end of the wheel hub 120 on the body side of the wheel hub 120, the end of the wheel hub 120 is plastically deformed as shown in FIG. It may be configured to be seated and maintained on the wheel hub 120 by fastening a nut or the like to an end thereof. In addition, the outer circumferential surface of the inner ring 130 may be provided with a raceway surface (inner raceway surface) with which the rolling element 150 contacts to support the rolling element from the inside in the radial direction.

However, in the case of the embodiment shown in the drawings, as described above, one side of the raceway for supporting rolling elements is directly formed on a part of the outer circumferential surface of the wheel hub, but the wheel bearing according to one embodiment of the present invention is different from this. It may be configured such that two inner rings are mounted on the wheel hub so that the raceway surface (inner raceway surface) of the rolling element is formed through the two inner rings, or any other structure is configured such that the inner ring is located radially inside the wheel hub. It is free even if it is formed by

According to one embodiment of the present invention, the outer ring constituting the non-rotating element 140 has a vehicle body-side mounting flange 142 connected to the vehicle body on an outer circumferential surface, and a raceway surface (outer orbital surface). The raceway surface (outer raceway surface) formed on the inner circumferential surface of the outer ring cooperates with the raceway surface (inner raceway surface) formed on the rotating element (eg, the wheel hub 120 and/or the inner ring 130) to form a rolling element between the raceway surfaces. It may be configured to receive and support the rolling element 150 .

According to one embodiment of the present invention, the rolling element 150 is disposed between the rotating element 110 and the non-rotating element 140, and supports the rotating element 110 rotatably with respect to the non-rotating element 140. function can be performed.

On the other hand, the wheel bearing 100 according to an embodiment of the present invention measures the road surface condition of the driving road (eg, whether the driving road is a slippery road condition, whether slip occurs on a wheel due to a slippery road surface condition, etc.) A road surface condition diagnosis system 200 for diagnosing may be further provided.

According to an embodiment of the present invention, the road surface condition diagnosis system 200 includes a sensing unit 210 that detects a signal related to an operating state (rotational speed of a wheel, vehicle acceleration, etc.) of a running vehicle, and detection from the sensing unit. It may be configured to include a diagnosis unit 240 and the like for diagnosing the road surface condition of the driving road based on the operating state information of the vehicle.

According to an embodiment of the present invention, the sensing unit 210 provided in the road surface condition diagnosis system 200 includes a rotational speed sensing unit 220 that detects information related to the rotational speed of a wheel (rotational speed of a wheel bearing) and An acceleration sensing unit 230 for detecting vehicle acceleration information may be included.

According to one embodiment of the present invention, the rotational speed sensing unit 220 is disposed on one side of the wheel bearing 100 and changes the magnetic field generated by the sensor target 160 mounted on the rotational element of the wheel bearing 100. It can be composed of a wheel speed sensor (WSS) that senses and detects the rotational speed of the wheel (rotational speed of the wheel bearing).

Specifically, the rotation speed sensing unit 220 is adjacent to one side of the wheel bearing so that the speed sensor 222 provided therein faces the sensor target 160 (eg, encoder) mounted on the rotation element of the wheel bearing 100. It may be configured to detect the rotational speed of the wheel by detecting a change in the magnetic field generated by the rotation of the sensor target 160.

According to one embodiment of the present invention, the rotational speed sensing unit 220 may be formed in the same or similar structure as a wheel speed sensor (WSS) used in a conventional wheel bearing, and the non-rotation of the wheel bearing It may be configured to be fixed to a vehicle body by being coupled to a chassis component such as a knuckle on which an element (eg, an outer wheel) or a non-rotating element of a wheel bearing is mounted.

According to an embodiment of the present invention, the acceleration sensing unit 230 may be fixed to a non-rotating element of the wheel bearing 100 or a chassis member to detect acceleration information of a running vehicle. Specifically, the acceleration sensor 232 may be provided in the acceleration sensing unit 230 and configured to detect an acceleration signal of a vehicle in motion. It may be composed of a 1-axis acceleration sensor capable of measuring acceleration in one direction, a 2-axis acceleration sensor capable of measuring acceleration in two directions, and a 3-axis acceleration sensor capable of measuring acceleration in all three directions.

As will be described later, the road surface condition diagnosis system 200 according to an embodiment of the present invention may be configured to diagnose the road surface condition of the road in which the vehicle is running using acceleration information in the driving direction (ie, the forward and backward directions of the vehicle). , The acceleration sensor 232 provided in the acceleration sensing unit 230 may be configured as an acceleration sensor that detects one-axis, two-axis, or three-axis acceleration signals including acceleration signals directed in the driving direction of the vehicle. For example, according to an embodiment of the present invention, the acceleration sensor 232 is a 3-axis MEMS acceleration sensor capable of measuring acceleration in the driving direction (front and rear directions of the vehicle), acceleration in the vertical direction (up and down directions of the vehicle), and acceleration in the axle direction. etc. can be configured.

According to an embodiment of the present invention, the diagnosis unit 240 of the road surface condition diagnosis system 200 receives the signal information obtained through the sensing unit 210 and diagnoses the road surface condition of the driving road (eg, driving It may perform a function of determining whether the road surface condition is good or slippery such as rain or snow, whether slip occurs in the wheels due to the road surface condition, etc.).

According to an embodiment of the present invention, the diagnosis unit 240 includes a first input/output unit 242 receiving operation state information of the vehicle from the sensing unit 210, and information transmitted through the first input/output unit 242 ( For example, the control unit 244 diagnoses the road surface condition of the road and/or the operating condition of the vehicle based on the road surface condition using information related to the rotational speed of wheel bearings and information related to acceleration in the driving direction of the vehicle, etc.) and stores reference data. It may include a memory unit 246 capable of storing diagnosis results or the like, and a second input/output unit 248 outputting diagnosis results from the control unit 244.

On the other hand, the control unit 244 provided in the diagnosis unit 240 is a filtering unit that filters the input signal (eg, a band-pass filter that passes only frequency signals in a specific region), and receives and analyzes the signal filtered by the filtering unit. It may include a signal analysis unit that performs a signal analysis unit, a condition diagnosis unit that diagnoses the condition of the road surface of the road on the basis of the analysis result of the signal analysis unit.

According to an embodiment of the present invention, road surface condition information (eg, slippery road condition information, wheel slip occurrence information, etc.) determined through the road surface condition diagnosis system 200 is transmitted to the vehicle's ECU (Electronic Control Unit 250), etc. and stored in the storage unit, displayed to the user through the display unit 252 such as a warning sound or display, or transmitted to the driving unit 254 and used to control the driving unit such as chassis parts.

On the other hand, according to an embodiment of the present invention, road surface condition information (eg, slippery road surface condition information) determined through the road surface condition diagnosis system 200 is vehicle location information and/or detection time point detected through GPS, etc. It is configured to be stored together with the time information of, so that if the vehicle drives the stored location in a slippery road condition in the future, the driving condition of the vehicle is automatically controlled based on the stored information or information about the road condition is displayed to the user, It may be configured to further improve driving stability of the vehicle.

On the other hand, in the road surface condition diagnosis system 200 according to an embodiment of the present invention, the diagnosis of the road surface condition is the rotational speed-related information provided from the rotational speed sensing unit 220 and driving detected from the acceleration sensing unit 230 as follows. It may be configured to be performed in a manner in which directional acceleration-related information is compared and determined. [For reference, in this specification, rotational speed-related information provided from the rotational speed sensing unit 220 includes rotational speed information of a wheel detected by the rotational speed sensing unit 220 and information calculated therefrom (rotational acceleration information, Driving direction speed information, etc.), and the acceleration-related information provided from the acceleration sensing unit 230 includes vehicle acceleration information detected by the acceleration sensing unit 230 and information calculated therefrom (rotational acceleration information, driving direction, speed information, etc.)]

For example, referring to (a) of FIG. 6, the rotational speed information 224 of the wheel bearing detected by the rotational speed sensing unit 220 (wheel speed sensor) is exemplarily shown, see (b) of FIG. The acceleration information 226 calculated by differentially calculating the rotational speed information shown in FIG. 6 (a) with respect to time and converting it into driving direction (front and rear direction of the vehicle) information in consideration of the companion radius of the tire is shown as an example. has been

Since the acceleration signal has a first-order differential relationship with the speed signal and time, the rotational acceleration signal of the wheel can be obtained by differentiating the rotational speed signal of the wheel shown in FIG. 6 (a) with respect to time. When is converted to acceleration in the driving direction considering the companion diameter of the tire (acceleration in the driving direction = 2xπx companion diameter x rotational acceleration of the tire), as shown in (b) of FIG. can be derived. [When calculating the acceleration signal in the driving direction by differential operation of the rotational speed signal and conversion operation to the driving direction, the differential operation and conversion operation may be performed in any order]

On the other hand, referring to FIG. 7 , acceleration information 236 detected by the acceleration sensing unit 230 (rear direction acceleration information of the vehicle) is illustrated as an example.

Since the acceleration in the forward direction of the vehicle shown in FIG. 7 represents the acceleration in the same direction as the acceleration shown in (b) of FIG. Traveling direction acceleration information 226 calculated from the driving direction acceleration information 236 detected from the illustrated acceleration sensing unit 230 and the rotational speed information of the rotational speed sensing unit 220 shown in FIG. 6 (b) They match within a predetermined range. However, if a wheel locking phenomenon occurs or the vehicle travels on a road with slippery road surface and slip occurs on the wheel while driving, the wheel (wheel bearing) cannot be rotated normally and the driving detected by the acceleration sensing unit 230 A difference occurs between the directional acceleration information 236 and the traveling direction acceleration information 226 calculated from the rotational speed information of the rotational speed sensing unit 230 . For example, when a wheel slips, the wheel cannot rotate sufficiently, so the driving direction acceleration information 226 calculated from the rotational speed information of the rotational speed sensing unit 220 is the value of the vehicle detected by the acceleration sensing unit 230. A value smaller than that of the driving direction acceleration information 236 is indicated. Therefore, when the driving direction acceleration information 226 calculated by calculating the rotational speed detected from the rotational speed sensing unit 220 and the driving direction acceleration information 236 of the vehicle detected from the acceleration sensing unit 230 are mutually compared It is possible to check whether wheel slip has occurred, and based on this, it is possible to diagnose whether the road on which you are driving is in a good road surface condition or whether it is a slippery road condition such as a rain or snowy road.

Specifically, the road surface condition diagnosis system 200 according to an embodiment of the present invention (i) differential operation and driving direction information of the wheel rotational speed information 224 detected by the rotational speed sensor 220 with respect to time If the acceleration information 226 calculated by converting to , is located within a predetermined range with respect to the vehicle driving direction acceleration information 236 detected by the acceleration sensing unit 230, the wheel does not slip (ii) the acceleration signal 226 calculated by converting the rotational speed information 224 of the wheel bearing detected by the rotational speed sensing unit 220 into time differential operation and driving direction information When the driving direction acceleration information 236 of the vehicle detected by the sensing unit 230 is out of a predetermined range, it may be configured to determine that slip occurs in the wheel. In addition, the road surface condition diagnosis system 200 according to an embodiment of the present invention, when it is determined that a wheel slip occurs, if such a wheel slip occurs more than a predetermined number of times within a predetermined time, the road surface condition of the road being driven is changed to rain or rain. It may be configured to determine that it is a slippery road surface condition such as a snowy road.

On the other hand, the above-described road surface condition diagnosis is performed by mutually comparing the rotational speed information detected from the rotational speed sensing unit 220 such as a wheel speed sensor (WSS) and the acceleration signal of the vehicle detected from the acceleration sensing unit 230. If configured to diagnose the road surface condition, the algorithm may be modified and implemented in any other way.

For example, the road surface condition diagnosis system 200 according to an embodiment of the present invention, contrary to the above-described embodiment, converts driving direction acceleration information of the vehicle detected by the acceleration sensing unit 230 into time integral operation and rotation direction information. It may be configured to perform wheel slip occurrence and diagnosis of road surface conditions by comparing the rotational speed information calculated by performing the conversion operation of and the rotational speed information detected by the wheel speed sensing unit 220. [When integrating the acceleration signal in the driving direction and converting it into the rotational direction to calculate the rotational speed signal in the driving direction, the integration and conversion operations may be performed in any order]

Alternatively, the road surface condition diagnosis system 200 according to an embodiment of the present invention differentiates the rotational speed information of the wheel bearing detected by the rotational speed sensor 220 with respect to time to calculate rotational acceleration information, and calculates rotational acceleration information. It may be configured to convert the driving direction acceleration information of the vehicle detected by the sensing unit 230 into rotational acceleration information in consideration of the rolling radius of the tire, and then compare these rotational acceleration information to determine whether wheel slip occurs and diagnose the road surface condition. .

As another method, the road surface condition diagnosis system 200 according to an embodiment of the present invention converts the rotational speed information of the wheel bearing detected by the rotational speed sensor 220 into driving direction information in consideration of the companion diameter of the tire, and travels. The direction speed information is calculated, and the driving direction speed information is calculated by integrating the driving direction acceleration signal of the vehicle detected by the acceleration sensing unit 230 with respect to time. It may be configured to perform road surface condition diagnosis.

According to this configuration, the road surface condition diagnosis system 200 according to an embodiment of the present invention detects rotational speed information (wheel rotational speed information) detected from the rotational speed sensing unit 220 and acceleration sensing unit 230. Since it is configured to perform a diagnosis of whether a wheel has slipped and a road surface condition of a driving road by comparing the obtained acceleration information (e.g., vehicle driving direction acceleration information) with each other, the road condition is reliable based on detection signals from both sensing units. Diagnosis can be performed. In addition, the road surface condition is diagnosed by performing simple first-order differential or simple first-order integration of the rotational speed information provided from the rotational speed sensing unit or acceleration information provided from the acceleration sensing unit with respect to time and conversion into driving direction/rotational direction. , it becomes possible to form the road condition diagnosis system 200 with a simpler structure and algorithm.

Although the present invention has been described above with specific details and limited examples, such as specific components, these examples are provided only to help a more general understanding of the present invention, and the present invention is not limited thereto, and the present invention Those skilled in the art can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments and should not be determined, and all things equivalent or equivalently modified in the claims as well as the claims described below belong to the scope of the spirit of the present invention. something to do.

100: wheel bearing
110: rotation element
120: wheel hub
130: inner ring
140: non-rotating element
150: rolling element
160: sensor target
200: road condition diagnosis system
210: sensing unit
220: rotational speed sensing unit
222: speed sensor
224: rotational speed signal
226: acceleration signal (in the driving direction calculated from the rotational speed signal)
230: acceleration sensing unit
232: acceleration sensor
236: acceleration signal (in the driving direction detected through the acceleration sensor)
240: diagnosis unit
242: first input/output unit
244: control unit
246: memory unit
248: second input/output unit
250: vehicle's ECU
252: display unit
254: driving unit

Claims (14)

A road surface condition diagnosis system 200 used to diagnose the road surface condition of a driving road,
A sensing unit 210 for detecting information related to the operating state of the vehicle;
And a diagnosis unit 240 for diagnosing the road surface condition of the road on the basis of the operating state information of the vehicle detected by the sensing unit 210,
The sensing unit 210 includes a rotational speed sensing unit 220 that detects a rotational speed of a wheel and an acceleration sensing unit 230 that detects vehicle acceleration information,
The diagnosis unit 240 mutually compares the signal information related to the rotational speed of the wheel detected from the rotational speed sensing unit 220 and the signal information related to the acceleration in the driving direction of the vehicle detected from the acceleration sensing unit 230. It is configured to diagnose the road surface condition of the road in progress,
Road condition diagnosis system. According to claim 1,
The diagnosis unit 240 calculates the driving direction acceleration information and the acceleration sensing unit by performing a derivative operation with respect to time and a conversion operation of the rotation speed information of the wheel detected by the rotation speed sensing unit 220 and the driving direction information. (230) configured to compare the driving direction acceleration information detected to diagnose the road surface condition of the driving road,
Road condition diagnosis system. According to claim 1,
The diagnosis unit 240 performs an integral operation with respect to time and a conversion operation of the driving direction acceleration information detected by the acceleration sensing unit 230 and the rotation speed information calculated by the rotation speed sensing unit 220 ) configured to diagnose the road surface condition of the road being driven by comparing the rotational speed information detected in
Road condition diagnosis system. According to claim 1,
The diagnosis unit 240 calculates the rotational acceleration information calculated by differentiating the rotational speed information of the wheel detected by the rotational speed sensing unit 220 with respect to time and the driving direction acceleration information detected by the acceleration sensing unit 230. Is configured to diagnose the road surface condition of the road being driven by mutually comparing the rotational acceleration information calculated by converting to rotational direction information,
Road condition diagnosis system. According to claim 1,
The diagnosis unit 240 converts the rotational speed information of the wheel detected by the rotational speed sensing unit 220 into driving direction information, and calculates the driving direction speed information and the driving direction detected by the acceleration sensing unit 230. Configured to diagnose the road surface condition of the road being driven by mutually comparing the driving direction speed information calculated by integrating the acceleration information with respect to time,
Road condition diagnosis system. According to any one of claims 1 to 5,
The road surface condition diagnosis system 200, when the rotational speed related signal from the rotational speed sensing unit 220 and the driving direction acceleration related signal from the acceleration sensing unit 230 match within a predetermined range, the wheel When it is determined that slip has not occurred, and the rotational speed-related signal from the rotational speed sensing unit 220 and the driving direction acceleration-related signal from the acceleration sensing unit 230 are located out of a predetermined range, the wheel slips. configured to determine that this has occurred,
Road condition diagnosis system. According to claim 6,
The road surface condition diagnosis system 200 is configured to determine that the road surface condition of the road being driven is a slippery road surface condition when wheel slip occurs at least a predetermined number of times within a predetermined time period.
Road condition diagnosis system. According to claim 7,
The road surface condition information determined by the road surface condition diagnosis system 200 is transmitted to and stored in a storage unit, displayed to a user through a display unit, or configured to be used to control a driving device.
Road condition diagnosis system. According to claim 8,
The road surface condition information determined by the road surface condition diagnosis system 200 is configured to be stored together with the location information where the road surface condition is detected.
Road condition diagnosis system. According to claim 9,
The road surface condition information determined by the road surface condition diagnosis system 200 is configured to be stored together with location information at which the road surface condition is detected and time information at the time when the road surface condition is detected.
Road condition diagnosis system. According to claim 9,
The road surface condition diagnosis system 200 is configured to display corresponding information to a user when driving on a road stored as a slippery road surface.
Road condition diagnosis system. According to claim 9,
The road surface condition diagnosis system 200 is configured to automatically control the driving condition of the vehicle in a state suitable for the slippery road surface when driving on a road stored as a slippery road surface.
Road condition diagnosis system. A wheel bearing 100 that rotatably mounts and supports a wheel of a vehicle to a vehicle body,
Equipped with the road surface condition diagnosis system 200 according to claim 6,
wheel bearings. A wheel bearing 100 that rotatably mounts and supports a wheel of a vehicle to a vehicle body,
Equipped with the road surface condition diagnosis system 200 according to claim 7,
wheel bearings.

Images