RU133928U1 - DIAGNOSTIC DIAGNOSTIC DEVICE FOR DIESEL ENGINE - Google Patents

Abstract

Diagnostic device for diesel engine fuel equipment, which consists of pressure sensors; analog-to-digital converter (ADC); personal computer (PC); connecting cables, characterized in that the pressure sensors are installed on the high pressure fuel lines, and a filter is separately installed, providing the possibility of obtaining diagnostic information, both with its use and without it, about all diagnosed fuel injectors at the same time.

Description

The utility model relates to devices for diagnosing fuel equipment of diesel engines in operating conditions.

A known device for diagnosing and adjusting engine systems KI-28229 ("rural machine" No. 12, 2009, p.30). The device is designed to assess the technical condition of the internal combustion engine (ICE), diagnose the power system of gasoline and diesel ICE, and diagnose hydraulic equipment.

A known system for the automated diagnosis of gasoline motor vehicles (RU 2349890 C1 G01M 15/04; 03/20/2009). The functioning of the system is based on determining the technical condition of gasoline autotractor internal combustion engines by continuously measuring fuel and energy indicators during six cycles of acceleration-coasting operations of the engine from minimum to maximum crankshaft idle speed. Processing of the results of monitoring the parameters of the technical condition of gasoline tractor engines is carried out in real time. According to the results of processing the controlled parameters, the following ICE parameters are determined: effective power; indicator power; power of mechanical losses; hourly fuel consumption; specific fuel consumption; uniform distribution of power among individual cylinders; ignition timing for each cylinder; operating modes of the centrifugal and vacuum regulator of ignition timing of the sensor-distributor. But this system allows you to evaluate the technical condition of only gasoline carburetor automotive engines that differ from diesel engines both in principle by the method of ignition of the working mixture and structurally by the device of the power system, and the system does not provide for the measurement of fuel pressure in the fuel supply lines of high-pressure diesel engine.

As a prototype, a well-known automated system for diagnosing fuel equipment of diesel tractor engines was selected (Pat. 103916 Russian Federation, IPC G01M 15/04; 04/27/2011). The system is designed to control the adjustment parameters of fuel equipment (TA) and determine the technical condition of precision parts. This TA diagnostic system for diesel autotractor ICEs consists of pressure sensors that are installed on the nozzle of the high pressure fuel pump (TNVD) using special tees in the high pressure line, a speed sensor that is installed opposite the flywheel teeth; analog-to-digital converter (ADC); adapter block for pressure and speed sensors; personal computer; connecting cables; specialized software. In the process of testing this diesel engine engine with this TA system, at least two engine acceleration cycles are carried out from the minimum stable to maximum crankshaft idle speed, during which the signals taken from the pressure sensors (installed on the injection pump fittings) and the rotation speed (installed opposite the flywheel teeth ), received by the ADC, which converts them to digital format and transfers them via USB-2.0 to a PC. On the computer, the received data is saved in the form of a text file with the extension “txt”, the text file is processed using specialized software, and the diagnostic test results are output in the form of a file with the resolution “doc” or “html”, for further printing on the printer or for save to your PC hard drive. But this system does not allow diagnosing the elements of the power system of diesel ICEs with a “Common Rail” type TA, in which the fuel pump has only one fitting and it is technically impossible to install a pressure sensor in it to break the fuel line. The fuel pump in this system pumps fuel into the fuel rail, and fuel is supplied to the nozzles from the rail and is regulated by the electronic control unit.

The purpose of the utility model is to increase the speed of determining the diagnostic parameters of diesel engines with fuel supply equipment with a Common Rail system while reducing labor costs by installing pressure sensors on the high pressure fuel lines using special connecting elements and monitoring parameters that directly reflect the technical condition of the fuel nozzles of the fuel supply equipment with Common Rail system.

A diagnostic device for fuel equipment (TA) for diesel engines based on a personal computer (PC) is designed to control the technical condition of nozzles in diesel ICEs with a common rail power system and to monitor the technical condition of plunger pairs, pressure valves, nozzles in power systems with in-line distribution and V-shaped fuel pumps of high pressure, with electronic and mechanical control of fuel supply.

Diagnostic device for diesel engine internal combustion engine TA consists of pressure sensors; analog-to-digital converter (ADC); personal computer; connecting cables; software.

A device for the diagnosis of diesel engine internal combustion engines operates as follows: during the test, three engine acceleration cycles are carried out from the minimum stable to maximum crankshaft idle speed, during which the signals taken from the pressure sensors enter the ADC, which converts them to digital format and transfers via USB-2.0 port to a PC. Then, the indicators are taken at the minimum stable engine speed of the engine, the maximum engine speed and the engine speed corresponding to the maximum torque. In the computer, the received data is saved in the form of a text file with the extension “txt”, the text file is processed using the software, and the diagnostic results are output in the form of a file with images of pressure plots obtained both during acceleration and at the engine speed corresponding to the minimum , maximum speed and speed corresponding to the maximum torque of the internal combustion engine, for further printing on a printer or for saving on a PC hard disk.

As a result of the diagnosis, the device determines the dependence of the fuel pressure in the high pressure fuel lines on the engine speed or on the time.

Based on the obtained dependence, fuel pressure graphs are constructed in high pressure fuel pipelines, which determine the technical condition of: pressure valves, nozzles, plunger pairs (for power systems with in-line, distribution and V-shaped high-pressure fuel pumps with electronic or mechanical fuel supply control); fuel injectors (for common rail power systems).

The block diagram of the system includes five blocks: pressure sensors; filter for pressure sensors; analog-to-digital converter; PC; software.

During the test test, the piezoelectric pressure sensors installed on the high pressure fuel lines measure the voltage through the filter using an ADC and then process it on a PC using software.

The software is necessary for processing the information obtained from the ADC and plotting the pressure versus time (or rotation speed) graphs for their analysis and making a diagnostic report on the technical condition of the diesel engine IC.

This diesel engine internal combustion engine diagnostic device can be used as a separate diagnostic complex for scheduled maintenance and troubleshooting of TA in conditions of service stations and operating conditions.

Information sources

1. The device for the diagnosis and adjustment of engine systems KI-28229 "rural machine" №12, 2009, p.30

2. Automated system for diagnosing gasoline automotive engines Pat. RU 2349890 C1 G01M 15/04; 03/20/2009.

3. Automated system for diagnosing fuel equipment of diesel automotive engines Pat. RU 103916 U1 G01M 15/04; 04/27/2011.

Claims (1)

Diagnostic device for diesel engine fuel equipment, which consists of pressure sensors; analog-to-digital converter (ADC); personal computer (PC); connecting cables, characterized in that the pressure sensors are installed on the high pressure fuel lines, and a filter is installed separately, providing the possibility of obtaining diagnostic information, both with its use and without it, about all diagnosed fuel injectors at the same time.

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