KR20000050916A - Apparatus for examine noise of automobile - Google Patents

Abstract

PURPOSE: A noise check apparatus for automotive vehicle is provided to achieve improvements enabling rapid and correct noise checking while outputting a graphical representation for a noise level according to the mileage of the automotive vehicle. CONSTITUTION: A noise check apparatus for checking a noise generated from an automotive vehicle passing through a predetermined test ground, the apparatus comprising a sound level meter(50) for outputting the noise level inputted from a microphone installed at a predetermined site of the test ground into an electric signal, an automotive vehicle data output unit for outputting data for a velocity of rotation of engine of the subject vehicle and data as to whether the vehicle has entered into the test ground, and a noise analysis unit(200) for calculating travelling distance of the vehicle according to an electric signal output from the sound level meter(50) and the velocity of rotation of engine and the data as to whether the vehicle has entered into the test ground and outputting a noise level corresponding to the calculated travelling distance in graphical representation.

Description

Vehicle noise inspection device {APPARATUS FOR EXAMINE NOISE OF AUTOMOBILE}

The present invention relates to a noise inspection apparatus for a vehicle, and more particularly, to a noise inspection apparatus for a vehicle that can quickly and accurately inspect the occurrence of noise in the vehicle.

In general, the noise inspection apparatus of a vehicle is a device for measuring the noise level of the vehicle so that the noise generated from the vehicle does not exceed the regulatory range prescribed by the law.

In the conventional vehicle noise inspection apparatus, as shown in FIG. 1, the test place 2 through which the vehicle 1 under test passes, and the predetermined distance r2 from the intermediate point of the test place 2. A microphone 3 installed in a vertical direction, a sound level meter 4 for converting the noise received through the microphone 3 into an electric signal of a corresponding level and outputting the sound level meter; It consists of an output part 5 which outputs the waveform of the signal output from (4) as a graph as shown in FIG.

The operation process of the conventional vehicle noise inspection device configured as described above is as follows.

First, when driving the vehicle (1) within the speed range prescribed by law to enter the test place (2) and then exit the test place (2), the noise generated from the car (1) is received through the microphone (3) An electrical signal is output from the microphone 3, and the electrical voice signal output from the microphone 3 is output to the output unit 5 after stabilization and amplification by the sound level meter 4.

The output unit 5 outputs a waveform corresponding to the electrical signal applied from the sound level meter 4 in a graph as shown in FIG. 2, and a tester outputs a noise level of the graph shown in FIG. 2. When the noise exceeds the standard set by the law, a measure to reduce the noise such as covering the sound absorbing material is found by finding the address sound source generated from the vehicle (1).

However, as described above, since the conventional vehicle noise inspection apparatus can only measure the noise level of the vehicle, the tester reinforces the sound absorbing material and the like at a predetermined portion of the vehicle where the noise is expected to be large, and then measures the noise level repeatedly. Since the inspection was performed by a sensory and empirical method, it took a long time for the inspection and there was a problem that the address sound source could not be found accurately.

Therefore, the present invention has been made to solve the problems of the prior art as described above, by outputting the noise level according to the driving distance of the vehicle in a graph, the tester can quickly and accurately examine the address sound source of the vehicle The purpose is to provide a noise inspection device for automobiles.

1 is a schematic view for explaining a conventional general vehicle noise inspection apparatus,

FIG. 2 is a schematic diagram illustrating a graph output through the output unit illustrated in FIG. 1;

3 is a schematic diagram of a noise inspection apparatus for a vehicle according to a preferred embodiment of the present invention;

4 is a schematic block diagram of the vehicle information output means and noise analysis means shown in FIG.

(A) to (b) of Figure 5 is a waveform diagram of each signal output from the main components shown in Figures 3 and 4,

6 is a schematic diagram showing a graph output from the output unit shown in FIG.

<Description of the code | symbol about the principal part of drawing>

10: car 20: test site

30 to 32: reflector 40: microphone

50: sound level meter 100: vehicle information output means

110: light sensor 120: engine tachometer

130: transmission telemetry 140, 210: antenna

200: noise analysis means 220: telemetry for reception

230: recording unit 240: record analysis unit

250: output unit

The noise inspection apparatus for a vehicle according to the present invention for achieving the above object, the sound level meter for outputting the level of noise input from the microphone installed at a predetermined point of the test place as an electrical signal, the engine of the vehicle under test Vehicle information output means for outputting information on the rotational speed and whether or not the vehicle enters the test site, the electrical speed output from the sound level meter and the engine rotation speed of the test vehicle output from the vehicle information output means And noise analysis means for calculating a moving distance of the vehicle according to the entry information and outputting a graph of the noise level according to the calculated moving distance of the vehicle.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a schematic diagram of a noise inspection apparatus for a vehicle according to a preferred embodiment of the present invention, as can be seen with reference to the same figure, the noise inspection apparatus for a vehicle according to the present invention, as shown in Figure 1, the test The vehicle 10 of the subject, the vehicle information output means 100 to be described later mounted on the vehicle 10 of the subject, and the test place 20 through which the subject vehicle 10 passes for the measurement of noise. ), A plurality of reflecting plates 30, 31 and 32 respectively provided at an entry point and an end point of the test place 20 and a distance RA corresponding to the total length of the test vehicle body from the end point. The microphone 40 installed in the direction perpendicular to the predetermined distance r2 from the middle point of the place 20, and the noise received through the microphone 40, correspond to the electric signal of the corresponding level (Fig. 5 (C)). Sound level meter 50 to be converted and output) Consists of the noise analysis means 200.

4 is a schematic block diagram of the vehicle information output means and the noise analysis means shown in FIG. 3, wherein the vehicle information output means 100 is mounted on the vehicle 10 under test, 5A is provided at a predetermined position on the front part to emit light toward the direction in which the above-described reflector plates 30, 31, and 32 are installed, and the light is reflected back from the reflector plates 30, 31, and 32, as shown in FIG. An optical sensor 110 for outputting a high-level pulse signal as described above, and an engine tachometer for outputting the engine speed of the vehicle 10 as an electrical signal corresponding to the waveform shown in FIG. The antenna 120 converts the pulse signal output from the optical sensor 110 and the electrical signal output from the engine tachometer 120 into a radio signal (for example, a radio frequency signal; It consists of a transmission telemetry 130 transmitted through 140. .

In addition, the noise analysis means 200 receives the radio signal transmitted from the transmission telemetry 130 through the antenna 210 receives the transmission telemetry 220 for converting it into a wired signal and outputting; A recording unit 230 for converting the signal output from the reception telemetry 220 and the signal output from the sound level meter 50 into a digital form and recording the signal; and analyzing the signals recorded in the recording unit 230. Recording analysis unit 240 for outputting a control signal for outputting a graph of the noise level according to the mileage of the vehicle 10, and as shown in FIG. 6 to the data output from the recording analysis unit 240. Accordingly, the output unit 250 outputs a graph showing the noise level according to the mileage of the vehicle 10.

For example, a digital audio tape recorder for converting an analog signal into a digital signal and recording the same on a magnetic tape is used as the recording unit 230.

5A to 5C are waveform diagrams of signals output from the main components shown in FIGS. 3 and 4, and FIG. 5A is a pulse signal output from the optical sensor 110. 5B is a signal waveform output from the engine tachometer 120, and FIG. 5C is a signal waveform output from the sound level meter 50. As shown in FIG.

FIG. 6 is a schematic diagram illustrating a graph output from the output unit illustrated in FIG. 4.

An operation example of the present invention configured as described above will be described in detail with reference to FIGS. 2 to 6.

First, when the vehicle 10 is started, power is supplied to the optical sensor 110, the engine tachometer 120, and the transmission telemetry 130 from the battery, not shown, of the vehicle 10, and the engine tachometer 120. ) And an electrical signal corresponding to the engine speed as shown in (b) of Figure 5 is output to the transmission telemetry 130.

In addition, light is emitted from the light emitting part of the light sensor 110 toward the side of the vehicle, that is, the direction in which the reflecting plates 30, 31, and 32 are installed, and the emitted light is reflected from the reflecting plates 30, 31, and 32. When the light is reflected back to the light receiving unit of the optical sensor 110, a corresponding high level pulse signal is output from the optical sensor 110 and input to the telemetry 130 (see FIG. 5A).

That is, when the front end of the vehicle 10 reaches the entry point of the test site 20 where the first reflector 30 is located, the first high level pulse signal is output from the optical sensor 110, and the When the front end reaches the end point of the test site 20 where the second reflecting plate 31 is located, the second high level pulse signal is output, and the front end of the vehicle 10 is counted from the end point of the test place 20. When the distance rA corresponding to the total length of the vehicle body of the vehicle 10 in which the first reflector 31 is located is reached, a third high level pulse signal is output.

The pulse signal output from the optical sensor 110 and the electrical signal output from the engine tachometer 120 are converted into a radio signal in the transmission telemetry 130 and transmitted through the antenna 140.

At this time, the receiving telemetry 220 converts the radio signal output from the transmitting telemetry 130 into a wired signal and inputs it to the recording unit 230.

At the same time, the noise generated from the test vehicle is converted into an electrical signal of a corresponding level in the microphone 40 and input to the sound level meter 50, and the electrical signal output from the microphone 40 is sound level meter. Amplified and stabilized at 50, it is input to the recording unit 230.

Here, the electrical voice signal output from the receiving telemetry 220 and the sound level meter 50 is converted into a digital signal in the recording unit 230 and then recorded and stored.

Then, when the tester instructs the record analyzer 240 to analyze the data recorded in the recorder 230, the data recorded in the recorder 230 is input to the record analyzer 240, and the record analyzer ( In 240, data applied from the recording unit 230 is analyzed.

Here, the record analysis process in the record analyzer 240 will be described in detail.

First, as shown in (a) of FIG. 5, the record analyzing unit 240 has a point in time at which the vehicle 10 enters the test site 20 at the point at which the first pulse signal from the light sensor 110 is output. From this point of time, as shown in FIG. 5 (b), the electric signal output from the engine tachometer 120 is analyzed to calculate the mileage of the vehicle 10, as shown in FIG. 5 (c). As described above, a recording analysis operation of measuring the level of noise is performed by analyzing the electrical voice signal output from the sound level meter 50.

For reference, the record analyzer 240 determines that the front end of the vehicle 10 has arrived at the test location when the second pulse signal is output from the optical sensor 110 as shown in FIG. Then, as shown in (a) of FIG. 5, it is determined that the vehicle 10 of the test object completely exits the test place 20 at the time point when the third pulse signal is output from the optical sensor 110.

Then, the record analyzer 240 outputs a graph indicating the noise level according to the mileage of the vehicle 10 as shown in FIG. 6 according to the data of the analyzed record through the output unit 250.

At this time, the tester can determine the vehicle model, the length of the vehicle body, the location information on the main components (for example, engine, transmission, muffler, etc.), the total distance of the test site 20, and the installation position of the microphone 40. Based on the information on the analysis of the graph as shown in Figure 6 to determine the location of the maximum noise generated in the car (10).

For example, in FIG. 6, the noise level measured at the point at which the vehicle 10 travels about 12.5 meters from the entry point of the test place 20 is the maximum, and the point where the microphone 40 is installed is the test place 20. Since the position is about 10 meters from the entry point of, the noise level becomes the maximum when the front end of the vehicle 10 passes about 2.5 meters past the installation point of the microphone 40.

That is, the maximum noise is generated in a portion about 2.5 meters from the front end of the vehicle 10, the muffler is installed in the rear of the vehicle 10 of the test object 10, the bar of the vehicle 10 It is determined that the maximum noise is generated from the muffler.

On the other hand, in the embodiment of the present invention has been described taking the case where the reflector is installed at the distance corresponding to the total length of the vehicle body from the entry point and the end point of the test place, and the end point, for example, but the engine speed of the vehicle Since the moving distance is calculated, it is possible to perform the noise test according to the present invention even if the reflector is installed only at the entry point of the test place.

As described above, according to the present invention, the noise level according to the mileage of the vehicle is output as a graph, so that the tester can quickly and accurately find a portion where the noise level of the vehicle is maximum through this graph.

Claims (4)

In the vehicle noise inspection apparatus for inspecting the noise generated from the vehicle passing through a predetermined test site, A sound level meter for outputting an electrical signal level of noise input from a microphone installed at a predetermined point of the test location; Vehicle information output means for outputting information on the engine rotation speed of the vehicle under test and whether the vehicle enters the test site; The moving distance of the car is calculated according to the engine rotational speed and the entry information of the test target car output from the sound level meter and the vehicle information output means, and the noise level according to the calculated moving distance of the car is calculated. Noise testing device for a vehicle, characterized in that composed of noise analysis means for outputting a graph. According to claim 1, The vehicle information output means, An engine tachometer that outputs the engine speed as an electrical signal, A reflector installed at an entry point of the test site, An optical sensor installed at a predetermined portion of the vehicle body and emitting light toward the reflecting plate and outputting a pulse signal corresponding to a light receiving state of the emitted light; And a transmission telemetry for converting the signal output from the engine tachometer and the optical sensor into a wireless signal and transmitting the same through an antenna. The method of claim 2, wherein the noise analysis means, Receiving telemetry for converting and outputting a radio signal transmitted from the transmitting telemetry into a wired signal; A recording unit which records a signal output from the reception telemetry and a signal output from the sound level meter; The driving distance of the vehicle is calculated according to the engine speed and the entry state data of the test vehicle recorded in the recording unit, and the noise level is measured by analyzing the output signal of the sound level meter recorded in the recording unit. Noise analysis device for a vehicle, characterized in that consisting of a record analysis unit for outputting a graph of the noise level according to the distance through the output unit. 4. The noise inspection apparatus of claim 3, wherein the recording unit is a digital audio tape recorder which converts an analog signal into a digital signal and records the converted digital signal on a magnetic recording tape.