Acta Technica Corviniensis

ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERINGengines. These values were transferred to theMATLAB mathematic software, with whose helpdifferent correlations were created.conclusions can be drawn referring to enginerunning in different revolutions and chargesspecific to urban traffic.ENGINE TESTINGThe study was conducted on two differentengines, petrol and diesel, and the data wereobtained with the help of the mega macs 55equipment from Gutmann company.The diagnosis of the engine management wasmade in urban traffic, the equipment beingconnected through the OBD coupling to theengine command central unit. The dataprevailed are displayed in the form of the datashown in the pictures below.Figure 1. VW Polo, 1.4i engineFigure 3. Real value of the oversupply pressure (v6)function of the real quantity injected (v3) and theacceleration lever position (v4) for the Opel Astra engineFigure 2. Opel Astra 2.0 DTI engineAs it can be observed, the system allows theregistration of the engine functional parametersin graphic form, and by moving the cursor alongthe abscissa, in the left side of the display onecan see the actual values of these parameters ata certain point in time.PROCESSING OF EXPERIMENTAL DATAFollowing the measurements made in traffic, ina 15 minute interval, the data were introducedin a specialized processing program, thus aseries of correlations being made, from whichFigure 4. Real value of the oversupply pressure (v6)function of the real advance in the injection (v2) and theacceleration lever position (v4) for the Opel Astra engine462008/ACTA TECHNICA CORVINIENSIS/Tome I