Abstract
The objective of passenger car engine tests performed on engine dynamometers, apart from the aspects of operation and durability, is the development in the range of suitable selection of parameters controlling the engine operation. The final selection of these parameters and their verification take place in the course of the tests accomplished with the use of engine dynamometers. The paper presents and discusses the effects of selected calibrations of 1.3 Multijet engine management system on the parameters of its operation and the composition of the exhaust gases. The accomplishment of that subject-matter resolved itself into testing work on an engine dynamometer to verify selected calibrations of the engine management system, developed on the basis of the experience of the authors acquired during their research performed earlier. Bearing in mind that the engine as the object of the testing serves as a power unit in a passenger car, it was assumed that the selection of the operational points of the engine, for which the tests should be performed on an engine dynamometer, should result from the mapping of the engine operation in the area of selected, characteristic phases of the driving test on a chassis dynamometer. The presented test results, exhaust gas composition and smokiness, as well as the overall efficiency for individual calibrations of the management system were put together in a form of bar graphs.
Highlights
Contemporary management systems of Diesel engines, offering the implementation of the multijet concept, more and more often split the injected dose into three to five separate doses which are called: pilot, pre, main, after- and postinjection
Based on the conclusions coming from earlier work performed by the authors, presented in publication [2], it was proved that the tests performed at low cost have given results in a series of calibrations of engine control parameters, for which the analyzed parameters offer more advantageous results
The adopted simplified methodology in the tests, restricted to modifications of the injection advance angle and the injection advance angles of individual doses of the total injection only, proved to be fully reasonable. Such knowledge served the purpose of appropriate preparation of the engine control algorithms for a final verification of these parameters on a chassis dynamometer
Summary
Contemporary management systems of Diesel engines, offering the implementation of the multijet concept, more and more often split the injected dose into three to five separate doses which are called: pilot-, pre-, main-, after- and postinjection. The Pilot-injection, about 0.7 millisecond before the main injection, ensures a time period needed to correct the intermixing of the fuel with air. The pre-injection phase shortens the time of ignition lag of the main-injection dose in order to reduce the formation of nitrogen oxides (NOx), increased loudness and vibration. The after-injection which occurs a fraction of millisecond after the main-injection, has got the afterburning effect on all the residues of particulate matter. The post-injection supports maintaining of the temperature of the exhaust gases in order to assure higher efficiency of the exhaust gas aftertreatment – diesel particulate
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