KR20050011919A - Device for detecting the defect of vehicle using the analysis of noise patterns - Google Patents

Abstract

PURPOSE: A device for detecting defect of a vehicle using analysis of noise patterns is provided to detect a trouble of a predetermined part by measuring noises of each part of the vehicle. CONSTITUTION: A device for detecting the defect of a vehicle using the analysis of noise patterns includes a microphone part(20), a noise analysis part(30), a data storing part(50), a calculation control part(40), a display part(70), and a key inputting part(60). The microphone part(20) includes a plurality of microphones in order to detect noises of each part and output the noises as electrical signals. The noise analysis part(30) converts noises of each part of the vehicle into frequency by analyzing the noises of each part using the electrical signals inputted from the microphones(20). The calculation control part(40) compares the frequency with normal/abnormal pattern data stored in the data storing part(50).

Description

Device for detecting the defect of vehicle using the analysis of noise patterns}

The present invention relates to a vehicle defect detection apparatus using noise pattern analysis. More particularly, the present invention relates to a vehicle fault detection apparatus, and more particularly, to measure operating noises generated in a predetermined portion of a vehicle during operation, and to compare the predetermined portion of the vehicle with previously stored normal / abnormal sound data. The present invention relates to a vehicle fault detection apparatus using noise pattern analysis for detecting a fault in a vehicle.

In many cases, the cause of the defect can be found from the abnormal noise generated during the operation of the vehicle when the defect occurs in the vehicle. Skilled technicians can determine the vehicle's abnormality from engine vibrations, acceleration sounds, chassis noises, and electrical equipment abnormalities, and repair defects.

However, the number of skilled technicians who can listen to abnormal sounds and maintain the vehicle is not only small, but also because there is a difference in skill level, there is a problem that the technicians consume unnecessary materials and time when they misjudge abnormal sounds.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to measure the operating noise generated in a predetermined portion of the vehicle while the vehicle is in operation, and to troubleshoot the predetermined portion of the vehicle in comparison with the normal sound / abnormal sound data previously stored. The present invention provides a vehicle defect detection apparatus using noise pattern analysis for detecting occurrence.

Another object of the present invention is to provide a vehicle defect detection apparatus using a noise pattern analysis capable of accurate detection of abnormal parts, improved maintenance reliability and simple vehicle inspection before delivery to a customer.

1 is a schematic installation state of a microphone mounted on a conventional vehicle,

2 is a side cross-sectional view of a partially installed state of a microphone;

3 is a cross-sectional view of the installation state of the microphone of FIG.

4 is a block diagram of a vehicle defect detection apparatus of the present invention;

5 is an embodiment of a noise pattern according to the present invention;

6 is a flowchart illustrating an operating state of the vehicle fault detection apparatus of the present invention.

※ Explanation of symbols about main part of drawing ※

10: vehicle 12: engine ECU

14: tire 16: body panel

20: microphone listening unit 21-25: first to fifth microphone

30: noise analyzer 40: operation control unit

50: data storage unit 60: key input unit

70: display unit

The vehicle defect detection apparatus using the noise pattern analysis of the present invention for achieving the above object, in a vehicle including a four-wheel drive and the engine ECU, to detect the operation noise of each part of the vehicle to output as an electrical signal A noise analyzer that analyzes the noise of each part of the vehicle by using a microphone listening unit including a microphone, an electrical signal input from the microphone listening unit, and an engine speed and rotation speed data input from an engine ECU, and converts and outputs the frequency into a frequency. And a calculation control unit for comparing the frequency signal output from the noise analyzer with normal sound / abnormal sound data previously stored in the data storage unit, and a display unit for visually displaying a failure state of the vehicle according to the control signal of the calculation control unit. And a key input unit for inputting a vehicle defect detection command to the operation control unit automatically or manually. It characterized in that it comprises.

Hereinafter, a vehicle defect detection apparatus using the noise pattern analysis of the present invention will be described in detail with reference to the accompanying drawings.

The vehicle defect detection apparatus of the present invention is for detecting a defect in a vehicle by using a change in operating noise according to the failure when a failure occurs in a specific portion of the vehicle. In the present invention, a plurality of listening microphones are installed in a predetermined portion of the vehicle for detecting operating noise, a noise analyzer for modulating the noise input from the microphone into a corresponding frequency signal, and a frequency output from the noise analyzer. An arithmetic control unit for determining an abnormality in a specific site using a signal is included.

1 is an installation state diagram for schematically showing the position of a plurality of microphones (21, 22, 23, 24, 25) installed adjacent to each part of the vehicle 10, in particular, the tire according to the present invention. As shown, the first microphone 21 inside the engine compartment, the second and third microphones 22 and 23 respectively inside the body of the front wheel, and the fourth and fifth microphones inside the body of the rear wheel, respectively. (24, 25) are provided.

The first to fifth microphones 21, 22, 23, 24, and 25 constitute a microphone listening unit 20. When the vehicle is driven, the operating noises generated at this time are collected through adjacent microphones. Although five microphones are installed in the figure, it is obvious that the number can be increased or decreased further and the installation position can be changed.

In particular, the present invention has a structure for smoothly collecting the operating noise and preventing moisture from penetrating into the microphone in the rain. Figure 2 shows the installation state of the microphone according to the present invention, in particular the installation state of the fifth microphone 25.

It can be seen that the fifth microphone 25 is provided inside the vehicle body in front of the tire 14. Of course, it is clear that this installation position can be changed to another position where operating noise can be measured more accurately. However, mounting outside the body is not desirable.

3 is a cross-sectional view illustrating a mounting state of the fifth microphone 25. The fifth microphone 25 is immovably fixed by the bracket 25a fixed to the inside of the body panel 16, and a part of the body panel 16 can be easily transmitted to the inside of the vehicle body. Sound transfer holes 25b are formed, and a waterproof thin plate 25c is installed in close contact with the surface of the vehicle body panel 16 to prevent water from entering from the outside on the front surface of the sound transfer holes 25b. . The waterproof thin plate 25c preferably has a thin thickness to facilitate sound transfer.

In the above description, the fifth microphone 25 provided on the right side of the rear wheel of the vehicle has been described as an example, but the remaining second to fourth microphones 22-24 provided on the front wheel and the rear wheel have the same mounting structure. On the other hand, it is obvious that the first microphone 21 installed in the engine room does not need a hole and a thin plate except for fixing by using a bracket.

4 is a block diagram of a vehicle defect detection apparatus of the present invention. As shown in the drawing, the operation sound of each part of the vehicle is detected and output as an electrical signal. The microphone listening unit 20 having a plurality of microphones, the electrical signal input from the microphone listening unit 20 and the engine ECU The noise analyzer 30 analyzes the noise in each part of the vehicle by using the engine speed and the rotational speed data inputted from the 12 and outputs the frequency signal and the frequency signal output from the noise analyzer 30. An operation control unit 40 comparing the normal sound data stored in advance in the storage unit 50, a display unit 70 for visually displaying a fault occurrence state of the vehicle according to a control signal of the operation control unit 40, and And a key input unit 60 for inputting a vehicle defect detection command to the operation control unit 40 automatically or manually.

The microphone listening unit 20 includes a plurality of microphones, and in the present invention, first to fifth microphones 21, 22, 23, 24, and 25 to detect operation noise of a vehicle. The signals detected from each microphone become electrical signals corresponding to operating noise.

Sound signals detected by the first to fifth microphones 21, 22, 23, 24, and 25 are input to the noise analyzer 30. The noise analyzer 30 converts the detected electrical signals into frequency signals and outputs the frequency signals. In addition, the engine speed and vehicle speed data are input to the noise analyzer 30 from the engine ECU 12 mounted on the vehicle and controlling the engine. The input engine speed and / or vehicle speed data is used to convert the noise signal into a frequency signal.

Noise analyzer 30 is an FFT (Fast Fourier Transform) which is an algorithm that can quickly perform a Fourier transform on the sound signal input from the microphone listening unit 20 using an octave filter. Output using

The FFT (fast Fourier transform) has a very effective frequency resolving function and thus is very effective in processing an audio signal (noise signal in the present invention). In the noise analyzer 30, it is preferable to perform fast Fourier transform by using the accumulated noise signal for a predetermined time (about 30 seconds).

The output data output from the noise analyzer 30 is input to the calculation control unit 40. The operation control unit 40 includes a control program and control data for comparing output data and controlling the entire apparatus. The operation control unit 40 is also connected to the data storage unit 50. The data storage unit 50 is used to store noise patterns for various defects and may use a memory or a storage device that is commonly used.

5 illustrates an example of a noise pattern stored in the data storage unit 50. Referring to the drawings, the noise pattern is stored as a waveform of frequency-dB, it can be seen that is set for each microphone provided in the microphone listening unit (20). The operation control unit 40 compares the output data input from the noise analyzer 30 with the waveform data as shown in FIG. 5, and compares and determines defects in a specific portion of the vehicle. The main problems occurring in the vehicle are categorized and the noise patterns are also patterned for the type and stored in the data storage 50.

The type and noise patterns thereof become reference patterns as 1) a pattern in a steady state and 2) noise patterns in a state where a defect occurs in a specific region. Reference patterns are measured and stored for each type, and are classified and stored in five types according to the present invention. The noise (noise) pattern is type 1) engine knocking (ignition plug error, engine oil error, valve error), type 2) engine noise (timing belt error, shock belt error, thermostat error), type 3) (Oil damage, clutch damage, transmission gear break, P-shaft over, bearing over), type 4) Chassis noise (brake wear, tire over wear, lower arm bushing wear, spring break, S / ABS leaking), type 5) It can be classified into electric field, design noise (various fan bearing wear, relay malfunction, air conditioner compressor noise).

The operation control unit 40 compares the currently measured noise signal input from the noise analyzer 30 with the reference noise pattern stored in advance and patterned according to the type, and if the measured noise signal matches any one of the reference noise patterns, the display unit. The warning is output through 70. The display unit 70 may use an LCD mounted on a vehicle or a dedicated display device.

The key input unit 60 is for signal input for the driver to select whether the vehicle defect detection by the noise measurement is in the automatic mode or the manual mode. In the automatic mode, the vehicle detects a defect by using the noise signal automatically detected at regular intervals.In the manual mode, the driver operates for a predetermined time (about 30 seconds) after the driver inputs a command to detect a vehicle defect. do.

An operation state of the vehicle defect detection apparatus using the noise pattern analysis of the present invention having the above configuration will be described with reference to the flowchart of FIG. 6. For convenience of explanation, the automatic mode is assumed.

The noise generated while driving the vehicle is detected by the microphone listening unit 20. The detected noise is output after being analyzed and processed by the noise analyzer 30. The output data is input to the operation control unit 40 and is compared with a reference noise pattern stored in advance. The reference noise pattern may be stored in the data storage unit 50 or in a device including a memory device such as an ECU 12 for engine control. The reference noise pattern data stored in the data storage unit 50 is read by the operation control unit 40 and compared with the currently measured noise signal.

As a result of the comparison in the operation control unit 40, if the currently measured noise signal coincides with or is similar to the normal pattern, the vehicle operates normally.

However, if it does not match the normal pattern, it is determined whether there is the same type pattern. The same type of pattern is compared with the noise patterns stored in the data storage unit 50. If the same pattern exists, a failure occurs in a specific part. Therefore, the arithmetic controller 40 notifies the failure of the corresponding part. Print a message. The output message is output through the display unit 70, and the driver can check the display unit 70 to determine whether a defect occurs at a specific site and take necessary measures.

However, if it does not match the pattern of the normal state and the same noise pattern does not exist, it is also displayed through the display unit 70 as an unknown defect state. The unknown defect state can be further added to the data storage unit 50 by determining a defect part through a detailed investigation and detecting a noise pattern when the defect occurs.

According to the present invention, it is possible to detect an abnormal abnormal part of the vehicle by measuring the operation noise generated in a predetermined portion of the vehicle while the vehicle is in operation and detecting the occurrence of a failure in the predetermined portion of the vehicle by comparing with the previously stored normal sound data. It is possible to improve the reliability of maintenance and to perform simple vehicle inspection before delivery to the customer.

Claims (4)

In a vehicle that is four-wheel drive and includes an engine ECU 12, It is for detecting the operation noise of each part of the vehicle 10 and outputting it as an electrical signal. The microphone listening unit 20 having a plurality of microphones, the electrical signal input from the microphone listening unit 20 and the engine ECU 12 Noise analysis unit 30 to analyze the noise in each part of the vehicle by using the engine speed and rotational speed data input from the) and output the frequency signal, and the frequency signal output from the noise analyzer 30, the data storage unit An operation control unit 40 for comparing the normal sound / abnormal sound pattern data stored in advance to 50, and a display unit 70 for visually displaying a fault occurrence state of the vehicle according to the control signal of the operation control unit 40; And a key input unit (60) for inputting a vehicle defect detection command to the operation control unit (40) automatically or manually. The method of claim 1, The apparatus for detecting a vehicle defect using noise pattern analysis, characterized in that the microphone listening unit (20) comprises a plurality of microphones installed at each part of the vehicle. The method of claim 1, The vehicle defect detection apparatus further comprises a key input unit (60) for inputting a vehicle defect detection command to the operation control unit (40) automatically or manually. The method of claim 1, Vehicle noise detection device using the noise pattern analysis, characterized in that for converting the noise by the noise analyzer 30, the input noise signal using a fast Fourier transform algorithm.