KR101535856B1 - Tire Pressure Monitoring Apparatus and Method - Google Patents

Tire Pressure Monitoring Apparatus and Method Download PDF

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Publication number
KR101535856B1
KR101535856B1 KR1020130154367A KR20130154367A KR101535856B1 KR 101535856 B1 KR101535856 B1 KR 101535856B1 KR 1020130154367 A KR1020130154367 A KR 1020130154367A KR 20130154367 A KR20130154367 A KR 20130154367A KR 101535856 B1 KR101535856 B1 KR 101535856B1
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South Korea
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wheel
pressure
tire
rotational speed
tires
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KR1020130154367A
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Korean (ko)
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KR20150069048A (en
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신승환
김대헌
최병구
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현대오트론 주식회사
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Abstract

The present invention relates to a wheel speed sensor for measuring the rotational speed of a wheel; A first decompression judgment unit for receiving the rotational speed information of the wheel from the wheel speed sensor and performing a radius analysis; And a second pressure reduction determination unit that performs frequency analysis based on the rotation speed information when the pressure of all the tires is normal by the first pressure reduction determination unit, So that it is possible to more accurately determine whether the tire is decompressed by correcting an error occurring in the radius analysis for determining whether the tire is decompressed or not.

Description

[0001] Tire Pressure Monitoring Apparatus and Method [0002]

The present invention relates to a tire pressure monitoring apparatus and method, and more particularly, to a tire pressure monitoring apparatus and method that can more accurately determine whether a tire is decompressed by correcting an error occurring in a radius analysis, And more particularly, to a tire pressure monitoring apparatus and method.

Recently, vehicles are equipped with a tire pressure monitoring system (TPMS) that detects the decrease in air pressure of a tire mounted on a vehicle and informs the driver.

If the air pressure of the tire is low, the vehicle may slip easily, leading to a major accident, fuel consumption is increased, fuel economy is deteriorated, tire life is shortened, and ride comfort and braking power are also reduced.

The Tire Pressure Monitoring System (TPMS) allows the driver to be informed of the pressure drop in the tire, thereby checking the pressure of the tire to prevent this problem in advance.

Tire pressure sensing systems can be largely classified into direct and indirect methods.

In the direct method, a pressure sensor is installed inside the tire wheel to directly measure the air pressure of the tire. The direct method can detect the decrease of the air pressure of the tire with high accuracy, but requires a dedicated wheel and has a problem in performance in a real environment, which is technically and costly.

The indirect method is a method of estimating the tire air pressure from the rotation information of the tire. Indirect tire pressure sensing systems can be further classified by Dynamic Loaded Radius (DLR) analysis method and Resonance Frequency Method (RFM) analysis method. This is briefly referred to as radius analysis and frequency analysis.

In the frequency analysis method, the decompressed tire is a method of detecting the difference from the normal-pressure tire by using the fact that the frequency characteristic of the wheel rotation speed signal changes. In the frequency analysis method, attention is paid to the resonance frequency which can be obtained by frequency analysis of the wheel rotation speed signal, and when the resonance frequency is calculated to be lower than the reference frequency estimated at the time of initialization, it is judged that the tire is decompressed.

The radial analysis method is a method of detecting the pressure drop by comparing the rotational speeds of four tires by using a phenomenon that the reduced load radii are smaller at the time of traveling of the decompressed tire and consequently the tire rotates faster than the normal tire as a result See, for example, Japanese Laid-Open Patent Publication No. 1988-305011).

However, in the tire pressure sensing system of the conventional radial analysis system, since the pressure drop of the tire is discriminated by comparing the wheel rotational speed with each other, when the four tires are all depressurized (for example, Natural air volume reduction) causes an error that determines that all the tires are normal.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a tire pressure control apparatus and a tire pressure control method for correcting a tire pressure, And to provide a monitoring apparatus and method.

According to an aspect of the present invention, there is provided a wheel speed sensor comprising: a wheel speed sensor for measuring a wheel speed; A first decompression judgment unit for receiving rotational speed information of the wheel from the wheel speed sensor and determining whether the tire pressure is decompressed through a dynamic load radius analysis; And a second pressure-decreasing judging unit for judging whether the pressure of the tire is reduced through resonance frequency analysis based on the rotational speed information of the wheel when the pressure of all the tires is normal by the first pressure- Device.

The tire pressure monitoring apparatus further includes a correction determining unit for determining that the pressure of all the tires is reduced and correcting the determination result by the first pressure reduction determination unit when the tire pressure is determined to be reduced by the second pressure reduction determination unit .

The second pressure reduction determination unit may perform the resonance frequency analysis based on the rotational speed information of the wheel only for the drive wheels.

The tire pressure monitoring apparatus may further include a preprocessor for correcting an error of the rotational speed information of the wheel and performing a preprocessing by applying a low-pass filter.

According to another aspect of the present invention, there is provided a method for controlling a wheel, comprising: receiving rotational speed information of a wheel from a wheel speed sensor; Performing dynamic load radius analysis using rotational speed information of the wheel; A first determination step of determining whether pressure of all the tires is normal as a result of the dynamic load radius analysis; Performing resonance frequency analysis based on the rotational speed information of the wheel when the pressure of all the tires is normal as a result of the determination in the first determining step; A second determination step of determining whether the tire has been decompressed as a result of the resonance frequency analysis; And determining that the pressure of all the tires is reduced if it is determined that the tire is depressurized as a result of the determination in the second determination step.

In the step of performing the resonance frequency analysis, the resonance frequency analysis may be performed on the basis of the rotational speed information of the wheel only for the driving wheels.

The tire pressure monitoring method may further include a step of correcting an error of the rotational speed information of the wheel after the input of the rotational speed information of the wheel and pre-processing by applying a low pass filter.

According to the tire pressure monitoring apparatus and method of the present invention, it is possible to determine whether a tire is decompressed more accurately by correcting an error occurring in a radius analysis for determining whether the tire is decompressed by comparing rotational speed information of the wheel.

1 is a block diagram showing a configuration of a tire pressure monitoring apparatus according to an embodiment of the present invention.
2 is a flowchart of a tire pressure monitoring method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

1 is a block diagram showing a configuration of a tire pressure monitoring apparatus according to an embodiment of the present invention.

1, a tire pressure monitoring apparatus 100 according to an embodiment of the present invention includes a wheel speed sensor 110, a first pressure reduction determination unit 120, and a second pressure reduction determination unit 130 do.

The wheel speed sensor 110 measures the rotational speed of each wheel of the vehicle. Four wheels are provided with a total of four wheels of a left front wheel 1 FL, a right front wheel 2 FR, a left rear wheel 3 RL and a right rear wheel 4 RR as shown in FIG. Four wheel speed sensors 110 are provided for measuring the rotational speed of the wheel of the vehicle. The wheel speed sensor 110 transmits the measured rotation speed information of each wheel to the first pressure reduction determination unit 120.

The first pressure reduction determination unit 120 receives the wheel rotation speed information from the wheel speed sensor 110 and performs a radius analysis for comparing the rotation speed of each wheel based on the received information. Radius analysis is a method of estimating which tire a pressure drop has occurred by comparing the rotational speed of each wheel from the rotational speed information of the wheel.

The radius analysis is performed by comparing the rotational speeds of the respective wheels to determine whether the tire is decompressed, so that the rotational speeds of the respective wheels can be compared by various methods. In this embodiment, the radius analysis is performed in the following manner.

The wheel rotational speed inputted from each of the wheel speed sensors 110 is W1 for the left front wheel 1, FL, right front wheel 2, FR, left rear wheel 3, RL and right rear wheel 4, , W2, W3, and W4, it is possible to calculate the average wheel rotation speed WA = (W1 + W2 + W3 + W4) / 4.

The determination values D1, D2, and D3 used for the radius analysis are calculated as follows using W1, W2, W3, W4, and WA.

D1 = ((W1 + W2) - (W3 + W4)) / (2WA)

D2 = ((W1 + W3) - (W2 + W4)) / (2WA)

D3 = ((W1 + W4) - (W2 + W3)) / (2WA)

D2, and D3 calculated by the above formula are compared with reference values obtained in advance by experiments or the like, and it can be determined that the pressure of the tire is decreased when D1, D2, and D3 are respectively greater than the reference value.

In the radius analysis, it is judged whether the tire is decompressed by comparing the rotation speed of each wheel relative to each other. Therefore, if the pressure of all the tires is decreased, an error may be determined that all the tires are normal.

The second pressure reduction determination unit 130 performs frequency analysis based on the rotational speed information of the driving wheel when the pressure of all the tires is normal by the first pressure reduction determination unit 120. [ The frequency analysis is a method of detecting a decrease in the air pressure of the tire by utilizing the fact that the frequency characteristic of the wheel rotation speed information changes.

Specifically, the second pressure reduction determination unit 130 calculates the resonance frequency of the drive wheels from the rotational speed information of the drive wheels input from the wheel speed sensor 110. [ The resonant frequency can be calculated in various known ways. For example, it can be calculated by using a tire model and an adaptive filter, or by using a fast Fourier transform (FFT).

When the calculated resonance frequency is lower than the resonance frequency at the normal tire pressure, the second pressure reduction determination unit 130 determines that the tire of the drive wheel is depressurized.

The second decompression judgment unit 130 performs frequency analysis only on the driving wheels without performing frequency analysis on all the wheels to simplify the analysis procedure. Frequency analysis of the driving wheel is more accurate than follower, so only frequency analysis of the driving wheel is performed.

The correction determination unit 140 determines that the pressure of all the tires is reduced when the tire pressure of the drive wheels is reduced by the second pressure reduction determination unit 130 and outputs the determination result by the first pressure reduction determination unit 120 .

That is, in the tire pressure monitoring apparatus 100 of the present embodiment, when it is determined by the first pressure reduction determination unit 120 that the pressure of all the tires as a result of the radius analysis is normal, the second pressure reduction determination unit 130 Thereby further judging whether the tire pressure of the drive wheel is normal or not by frequency analysis. If it is determined by the second pressure reduction determination unit 130 that the tire pressure of the drive wheels is reduced, the correction determination unit 140 determines that all the tires are normal by the first pressure reduction determination unit 120, As a result of judging that it has occurred.

Accordingly, it is possible to more accurately determine whether the tire is decompressed by correcting an error that occurs when the pressure of all the tires is reduced in the radial analysis system.

The tire pressure monitoring apparatus 100 of the present embodiment may further include a preprocessing unit 150 that corrects an error of the rotational speed information of the wheel transmitted from the wheel speed sensor 110 and preprocesses by applying a low pass filter .

The preprocessor 150 preprocesses the rotational speed information by applying a low pass filter to the rotational speed information, and then outputs the preprocessed rotational speed information to the first pressure reduction determination unit 120 and the second pressure reduction determination unit 130). That is, the preprocessor 150 corrects the offset value of the wheel speed sensor 110 from the rotation speed information, and passes the rotation speed signal through the low-pass filter to remove the abnormal signal existing in the rotation speed information, The validity of the rotational speed information can be improved.

As described above, according to the tire pressure monitoring apparatus 100 of the present invention, there is an effect that it is possible to make a more accurate determination by correcting an error occurring in the radius analysis for determining whether the tire is decompressed by comparing the rotational speed information of the wheel .

Hereinafter, a tire pressure monitoring method according to an embodiment of the present invention will be described with reference to the accompanying drawings. However, the description of the same things as those described in the tire pressure monitoring apparatus 100 according to the embodiment of the present invention will be omitted.

2 is a flowchart of a tire pressure monitoring method according to an embodiment of the present invention.

Referring to FIG. 2, the tire pressure monitoring method according to an embodiment of the present invention may include a step S100 of receiving rotational speed information of a wheel from a wheel speed sensor 110, (S300) of judging whether the pressures of all the tires are normal as a result of the radius analysis. When the pressure of all the tires is normal, (S500) of determining whether the tire of the driving wheel is depressurized as a result of the frequency analysis. When frequency of the tire of the driving wheel is reduced, the pressure of all the tires (Step S600).

The radius analysis is performed in the first pressure reduction determination unit 120 of the tire pressure monitoring apparatus 100 according to an embodiment of the present invention and the frequency analysis is performed in the second pressure reduction determination unit 130.

In the tire pressure monitoring method of the present embodiment, the radius analysis is performed from the rotational speed information of each wheel, and when all the tires are judged to be the normal pressure, the frequency analysis is further performed on the drive wheels. As a result of the frequency analysis of the drive wheels, if it is determined that the tire of the drive wheel is in the depressurized state, it is determined that the pressure of all the tires is reduced. Accordingly, it is possible to correct an error occurring in performing the radius analysis.

In the step of performing frequency analysis (S400), frequency analysis is performed on only the driving wheels without performing frequency analysis on all the wheels, thereby simplifying the analysis processing procedure. Frequency analysis of the driving wheel is more accurate than follower, so only frequency analysis of the driving wheel is performed.

The details of each step are the same as those in the tire pressure monitoring apparatus 100 according to the embodiment of the present invention, and therefore, detailed description thereof will be omitted.

Meanwhile, the tire pressure monitoring method of the present embodiment may further include a step (S700) of correcting an error of the rotational speed information and applying a low pass filter to preprocess after the step of receiving rotational speed information of the wheel. In the preprocessing step S700, the offset value of the wheel speed sensor 110 is corrected in the rotation speed information, the abnormal signal existing in the rotation speed information is removed by passing the rotation speed signal through the low-pass filter, The validity of the information can be improved.

As described above, according to the tire pressure monitoring method of the present invention, it is possible to determine whether the tire is decompressed more accurately by correcting an error occurring in the radius analysis, which determines whether the tire is decompressed, by comparing the rotational speed information of the wheel .

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: tire pressure monitoring device
110: Wheel speed sensor
120: first decompression judgment unit
130: second decompression judgment unit
140:
150:

Claims (7)

A wheel speed sensor for measuring the rotational speed of the wheel;
A first decompression judgment unit for receiving rotational speed information of the wheel from the wheel speed sensor and determining whether the tire pressure is decompressed through a dynamic load radius analysis;
A second depressurization determination unit for determining whether the tire pressure is depressurized through resonance frequency analysis based on the wheel speed information; And
And a correction judging section which judges that the pressures of all the tires are reduced when the tire pressure is judged to be reduced by the second pressure reduction judging section,
The second pressure reduction determination unit performs the resonance frequency analysis on the tires of the drive wheels to determine whether the tire pressure of the drive wheels is normal even if the pressure of all the tires is determined to be normal by the first pressure reduction determination unit, When it is determined that the tire pressure of the drive wheel is reduced, the correction determination unit determines that the pressure of all the tires is reduced and corrects the normal determination result of the tire pressure determined by the first pressure decrease determination unit to an abnormal determination in which all tires are depressurized Wherein the tire pressure monitoring device is a tire pressure monitoring device. delete delete The method according to claim 1,
And a preprocessor for correcting an error of the rotational speed information of the wheel and applying a low-pass filter to perform preprocessing. Receiving rotational speed information of a wheel from a wheel speed sensor;
Performing dynamic load radius analysis using rotational speed information of the wheel;
A first determination step of determining whether pressure of all the tires is normal as a result of the dynamic load radius analysis;
Performing resonance frequency analysis on the tire of the driving wheel based on the rotational speed information of the wheel when the pressure of all the tires is normal as a result of the determination in the first determining step;
A second determination step of determining whether the tire has been decompressed as a result of the resonance frequency analysis; And
And correcting the determination result of the first determination step so that the pressure of all the tires is reduced if the tire is determined to be reduced in the second determination step. delete 6. The method of claim 5,
After receiving the rotational speed information of the wheel,
Further comprising the step of correcting errors in the rotational speed information of the wheel and pre-processing by applying a low pass filter.
KR1020130154367A 2013-12-12 2013-12-12 Tire Pressure Monitoring Apparatus and Method KR101535856B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09249010A (en) * 1996-03-14 1997-09-22 Sumitomo Electric Ind Ltd Initial correction coefficient arithmetic unit and device using the unit
JPH10129222A (en) * 1996-10-25 1998-05-19 Nippon Soken Inc Tire inflation pressure detecting device
JP2004067009A (en) * 2002-08-08 2004-03-04 Toyota Motor Corp Tire state estimating device
KR20120109984A (en) * 2011-03-25 2012-10-09 스미토모 고무 고교 가부시키가이샤 Apparatus, method and computer-readable recording medium having program recorded therein for vehicle mass estimation, and apparatus, method and computer-readable recording medium having program recorded therein for detecting decrease in tire air pressure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09249010A (en) * 1996-03-14 1997-09-22 Sumitomo Electric Ind Ltd Initial correction coefficient arithmetic unit and device using the unit
JPH10129222A (en) * 1996-10-25 1998-05-19 Nippon Soken Inc Tire inflation pressure detecting device
JP2004067009A (en) * 2002-08-08 2004-03-04 Toyota Motor Corp Tire state estimating device
KR20120109984A (en) * 2011-03-25 2012-10-09 스미토모 고무 고교 가부시키가이샤 Apparatus, method and computer-readable recording medium having program recorded therein for vehicle mass estimation, and apparatus, method and computer-readable recording medium having program recorded therein for detecting decrease in tire air pressure

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