RU2445596C2 - Automated diagnostic system of stationary diesel engines - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: automated diagnostic system of stationary diesel engines consists of rotation velocity sensor, fuel flow sensor, cylinder pressure sensor, smoke metre, vibration sensor, sensor interface assembly (ADC - analogue-to-digital converter) to personal computer (PC), which are installed on the tested engine, and PC itself. Vibration sensor BC202, smoke metre "Infrakar D-1", and analogue-to-digital converter E440 on the basis of digital signal processor ADSP-2185M are installed on the engine.

EFFECT: invention allows improving the accuracy of determination of actual check parameters of technical state of engines and their deviations from nominal values, diagnosing the stationary diesel engine, evaluating by means of computer the possibility of further operation at simultaneous reduction of labour costs owing to automation of measurement process of primary values and analysis of the obtained data.

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Description

The invention relates to engine building, in particular to devices for diagnosing stationary diesel engines in operating conditions. The invention can be used to improve the accuracy of determining control parameters of the technical actual condition of engines and their deviations from nominal values, diagnosing a stationary diesel engine, automated assessment of the possibility of further operation, while reducing labor costs by automating the process of measuring primary values and analyzing the data obtained.

A well-known automated system for the diagnosis of gasoline autotractor engines (a.s. RU 2007123233/06, G01M 15/04). The automated system is based on the fact that in the course of six cycles of acceleration-coasting operations of the engine, signals from the rotational speed sensor, fuel consumption sensor, ignition timing sensor, pressure sensor enter the recording device, which consists of seven main elements (three level converters , instrumentation amplifier, operational amplifier, analog-to-digital converter (ADC) and microcontroller), which converts them into digital format and transfers them to a PC. After that, the received information is processed in a PC and the control results are presented to the user in the form of digital values of the diagnostic parameters and graphs of the dynamic speed characteristics of the engine. However, this system does not allow automated assessment of the possibility of further operation and the condition of the engine. In addition, the method does not allow to evaluate in full the real state of the power system and lubrication of diesel engines that differ from gasoline, both fundamentally by the method of ignition of the fuel mixture and structurally by the device of the fuel supply elements.

The purpose of the invention is to increase the accuracy of determining control parameters of the technical actual condition of diesel engines, their deviations from the nominal values, an automated assessment of the health of a diesel engine while reducing labor costs by automating the process of measuring primary values and analyzing the data obtained.

The automated diagnostic system for stationary diesel engines consists of the following installed on the tested engine: speed sensor, fuel consumption sensor, pressure sensor in the cylinder, smoke meter, vibration sensor, sensor interface unit (ADC - analog-to-digital converter) with a personal computer (PC) and PC (Fig. 1), where:

1 (EE) - crankshaft speed sensor, type ДЧВ-2;

2 (AE) - vibration sensor, type BC202;

3 (FE) - fuel consumption sensor type ERSV-011;

4 (PE) - gas pressure sensor in the cylinder of the engine type MIDA-DI52P;

5 (BE) - smoke meter, type "Infracar D-1";

6 (ADC) - 32-channel analog-to-digital converter of type E440 based on the digital signal processor ADSP-2185M, designed to convert analog signals received from sensors into discrete information for transmission to a PC;

7 (PC) - is intended for receiving measurement information from the ADC, processing it in accordance with predetermined algorithms, visualizing the measurement and processing results, and also for storing it on a magnetic medium in digital form. As a registrar, a PC compatible with an IBM-type PC is used;

8 - stationary diesel engine;

9 - a synchronous generator designed to convert mechanical energy of rotation of the crankshaft of a diesel engine into electrical energy.

An automated diagnostic system for stationary diesel engines based on a personal computer (PC) is designed to monitor technical and economic indicators, the efficiency of a diesel engine and assess its actual condition.

The system for diagnostic tests of engines works as follows: during the test, the load characteristic of the engine is triple taken, where the load argument (N _e ) changes from 0% to 100% of the load, in steps, with a step of 25%, during which the signals taken from the primary sensors installed on the engine are fed to the ADC, which converts them to digital format and transfers them to a PC. All information received is processed in a PC using a special program and presented in the form of numerical values of the technical condition parameters and graphs of the engine load characteristics. Also, on the basis of the data obtained, a logical model of the possibility of faults is built, which allows to evaluate the actual state of the engine in real time (Fig. 2).

As a result of solving the problem of diagnosing a stationary diesel engine, the system determines the load characteristics, which are dependencies:

- technical and economic indicators of the engine from the load mode;

- level of vibration from the load mode;

- hourly fuel consumption from the load mode and time;

- smoke from the load mode.

Based on the above dependencies and the obtained indicators, a logical model is built on the basis of which the performance indicators and the actual state of a stationary diesel engine are calculated:

- system availability factor;

- coefficient of technical use;

- MTBF;

- system recovery time after failure;

- the significance of the measured parameters in the health of the system (Fig. 3).

The device can be used as a separate diagnostic tool for scheduled maintenance, troubleshooting and adjusting engines in everyday use at repair facilities.

Claims (1)

The automated diagnostic system for stationary diesel engines consists of a speed sensor, a fuel consumption sensor, a cylinder pressure sensor, a smoke meter, a vibration sensor, a sensor interface unit (ADC - an analog-to-digital converter) with a personal computer (PC) and the PC itself , characterized in that the engine is equipped with a vibration sensor, type BC202, a smoke meter, type Infracar D-1, an analog-to-digital converter, type E440 based on a digital signal processor ADSP-2185M.

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