SU759891A1 - Device for diagnosis of internal combustion engine mechanisms - Google Patents

Description

The present invention relates to the field of diagnosing machinery mechanisms, in particular mechanisms of internal combustion engines, and can be used, for example, to diagnose a fuel system of a gas distribution mechanism, a cylinder-piston group, and other mechanisms of a diesel engine.

A device is known for diagnosing engine mechanisms, internal combustion by parameters, vibration impulses, comprising a vibration transducer connected via a signal conditioning circuit made in the form of a series-pass filter in the audio frequency range and an amplifier with an indicator associated with a phase-selective device containing a counting-selective unit whose input is connected to. the output of the reference point converter [1].

The disadvantages of the known device are limited in improving the accuracy of diagnosing engine mechanisms.

The aim of the present invention is to increase the accuracy of diagnosis by using the principle of generating signals from diagnosed engine mechanisms during its operation, which have a higher resolution. Amplitude and better temporal characteristics of phase diagnostic parameters.

This goal is achieved by the fact that the band-pass filter of the signal generation circuit is resonant with a Tuning Frequency equal to the natural vibration frequency of the vibration transducer in the ultrasonic range, and a synchronization circuit for the reference point of the engine operation cycle from the * fuel supply vibration signal made in is introduced into the phaeo-selective device. Vibration transducer connected through an additional; band-pass. The filter of the resonant frequency of the vibroconversion-. ultrasonic range with another input of the counting-selective block.

The drawing shows a structural diagram of a device for diagnosing mechanisms.

A device for diagnosing mechanisms of an internal combustion engine contains a converter (b reference point connected to one of the inputs of the counting-selective unit 2, the synchronization vibro-converter 4 is connected to the other input through a filter 3 of the resonant frequency of the vibration converter, and the output of the counting-selective block 2, 'is connected with one of the inputs of the indicator 5, the other input of which is through the amplifier 6, an additional band-pass filter 7 of the resonant frequency of the vibration transducer is connected to the vibration transducer 8 of eritelnogo channel.

The device operates as follows.

During operation of the internal combustion engine, the reference point converter 1 generates two signals during the operation cycle ''',, corresponding to a certain angular position * ¹ of the engine shaft, for example, top dead center. At the output of the circuit, consisting of a synchronization vibration converter 4, mounted on a specific section of the fuel supply, a timer, on the nozzle body, and a filter 3 of the resonant frequency of the vibration converter, a synchronization signal is generated. This signal occurs, for example, when the needle is planted on the nozzle atomizer body. β

In this case, the signals from neighboring sections have several times lower amplitude due to better spatial selection when using filtering in the ultrasonic range. Thanks to this, after limiting the signal ........ synchronization’s has a repetition rate equal to the frequency of engine cycles. By means of a synchronization signal in a counting-selective block. 2 of the two signals of the reference point in the cycle of operation stands out one.

In block 2, strobe pulses are formed independently of the rotational speed. With a relative REFERENCE reference point, the phase and duration. In indicator 5, vibration shock pulses are extracted in strobe pulses from the tested motor interfaces, and the measurement signals of the phase interval between the start of the shock-shock Gs pulse and the Reference point or are generated. at the beginning of the strobe pulse, as well as the average maximum amplitude of the vibrational pulses for a certain number of cycles.

From the measured phase relative to the reference point and the mean ^maximum: vibroudarnogo amplitude pulse with '*' ^^ '^ f'U'Tsy't ‴ otehni'che _C com condition. investigated engine mechanism.

Thus, the device allows you to measure the average maximum amplitude of vibration impulses from the tested mechanism for a certain number of engine cycles and the phase of these pulses relative to the reference point on the time axis of the cycle of operation of the internal combustion engine. The measured values are diagnostic parameters ^{, υ} parameters.

Using the device allows to increase the accuracy of diagnosis, its performance and quality 15 to obtain new diagnostic information about the internal combustion engine.

Claims (1)

A device for diagnosing the mechanisms of an internal combustion engine according to the parameters of vibration-shock 25 pulses, containing a vibration transducer connected through a signal generation circuit made in the form of a series-pass filter in the audio frequency range and an amplifier with an indicator associated with a phase-selective device containing an accountNo-selective block, input which is connected to the output of the reference point converter, characterized in that, in order to improve the accuracy of diagnosis by using using the principles of signal generation having a higher resolution of parameters, a band-pass filter of the sig. the cores are made resonant with a tuning frequency equal to the natural vibration frequency of the vibration transducer in the ultrasonic range, and a synchronization reference point of the engine operation cycle from the fuel supply vibration signal, made in the form of a vibration transducer connected through an additional band-pass filter of the resonant frequency of the vibration transducer in the ultrasonic range, is inserted into the phase selective device 45 e other input counting block.