SU1173230A1 - Process of combustion engine diagnosis - Google Patents

Abstract

A METHOD FOR DIAGNOSTICALLY INSIDE ANTI-COMBUSTION ENGINE, consisting in that the vibration pulses from the vibration sensor are recorded by the vibration sensor. shocks in the tested coupling, and the vibration pulses identify the amplitudes of the vibration pulses in the ultrasonic frequency range, analyze them, and determine the technical condition of the engine according to the results, in order to improve the accuracy, Vibration pulses are conducted in the frequency range, the lower boundary of which is in the range of waves commensurate with the geometrical dimensions of the impacted areas of the tested conjugation, and in the processing of the vibroim. pulses are divided by amplitudes into intervals and the number of vibration pulses in intervals is determined, and the number of vibration pulses in each interval is affected as a result of processing. (L

Description

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The invention relates to the field of diagnostics of mechanisms and machines, in particular internal combustion engines (two).

The purpose of the invention is to improve the accuracy of diagnostics two.

Figure 1 shows the block diagram of the device for implementing the method; Fig. 2 shows histograms of amplitudes of vibration pulses of a diesel engine SMD-62 at 1500 (Fig. 2a: distribution of low-frequency vibration pulses in the normalized range of a piezo accelerometer without frequency selection; fig.2b - distribution of high-frequency vibration pulses selected at 0.5 KHz).

In figure 2 marked: A - the average value of the reduced amplitude A; V is the amplitude variation coefficient.

The device for diagnosing internal combustion engines includes (Fig. 1): vibration sensor 1, differentiator 2, filter 3, measuring and computing unit 4, and phase selection device 5. I

The principle of operation of the device is as follows.

The signal from the vibration sensor 1 of the diagnosed mechanism installed in the control zone is fed to differentiator 2. The latter transforms the signal spectrum into a form convenient for selecting vibration pulses in the ultra sound range of the resonant region of the vibration sensor. The vibrated signal with the transformed spectrum from the differentiator 2 is fed to the filter 3, tuned to frequencies with a wavelength commensurate with the geometric dimensions of the impacted areas of the diagnosed ICE interface. The signal selected by filter 3.

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is fed to the measuring input of the measuring and computing unit 4. The control input of the measuring and computing unit 4 is supplied with a pulse of gating from the phase-selection device 5, which operates synchronously with the internal combustion engine.

The method is carried out using the proposed device as follows.

0 way.

The amplitudes of the vibration pulses selected in the wavelength range, commensurate with the dimensions of the impacted areas, are measured and recorded.

5 mate ICE. Then the amplitudes of vibration pulses are broken up into classes (intervals). To simplify further comparison of the obtained histogram with the reference, the class intervals are chosen as the relative value of the maximum amplitude value of the registered vibration pulses. The number of vibration pulses in the classroom intervals is compared with the reference values.

5 According to the results of the comparison, judging about the technical condition of the engine.

In order to automate the operation and compare histograms of measuring and computing

0 unit 4 of the device is implemented as an amplitude distribution analyzer of vibration pulses.

The parameters of the vibration pulses selected in the range of waves commensurate with the dimensions of the impacted areas of the interfaces of the internal combustion engines more closely correspond to the physical processes of the formation of the vibro-shock response in the mechanism. Thus, the proposed method and device provide

improving the accuracy of diagnosis

two.

Claims (1)

METHOD FOR DIAGNOSIS OF THE INTERNAL COMBUSTION ENGINE, which consists in registering vibration pulses from. beats in the tested conjugation, and vibration pulses are emitted in the ultrasonic frequency range * determine the amplitude of the vibration pulses, conduct their processing, and according to the results judge the technical condition of the engine, characterized in that, in order to improve accuracy., the selection of vibration pulses is carried out in the frequency domain, the lower limit which is in the wavelength range commensurate with the geometric dimensions of the impacted areas of the tested interface, and when processing vibroimpulses, they are divided by the amplitudes into intervals and determined yayut amount in vibrational impulse intervals, and as a result of processing as the amount in each of the vibrational impulse intervals. FIG. 1 1 1173230