Abstract
The paper presents the issue of the construction of the fuel consumption and exhaust emissions dynamic characteristics based on the data obtained during the NEDC and FTP-75 driving tests. The results presented in the publication are based on the tests of a class C vehicle, performed in a certified exhaust emissions laboratory. The distributions of engine crankshaft accelerations as a function of its speed for both tests at 1-second intervals have been collated. At these points the measurements of the exhaust emissions were carried out. The authors described the conditions in which modal measurements of the fuel consumption and exhaust emissions in both tests were carried out. The results of the measurements were used for the construction of the approximated characteristics being the functions of velocity and acceleration of the engine crankshaft. Based on the obtained measuring results the approximated dynamic characteristics of the emissions of the four main exhaust components have been developed and the approximations were done with the use of the third order functions. An analysis of the obtained results has been performed and the authors presented the differences resulting from the construction of the above characteristics based on the combined data from the NEDC and FTP-75 tests and each of the tests separately. Moreover, the differences between the data obtained from the individual tests have been presented and evaluated graphically. The obtained results have been summarized and evaluated.
Highlights
In the calculations of the fuel consumption or exhaust emissions universal characteristics are frequently used on which the points or lines are overlain of moments of motion resistance depending on the individual vehicle features or traffic conditions
At more dynamic traffic conditions the dynamic characteristics, whose build has been described in this paper, may turn out useful
The methodology of obtaining of the presented dynamic characteristics is based on the modal measurements of the exhaust emissions in typical driving tests-NEDC and FTP-75
Summary
In the calculations of the fuel consumption or exhaust emissions universal characteristics are frequently used on which the points or lines are overlain of moments of motion resistance depending on the individual vehicle features or traffic conditions. The methodology of obtaining of the presented dynamic characteristics is based on the modal measurements of the exhaust emissions in typical driving tests-NEDC and FTP-75. If we assume the on-road emissions as a function of speed and acceleration (or angular velocity of the crankshaft and its angular acceleration) the set of the measuring points in these coordinates can be presented as in Fig. 3 and 4 This set is an image of connected measuring points when realizing the NEDC and FTP-75 driving tests at the interval of 1 second. Zbiór rozmieszczenia punktów pomiarowych w testach jezdnych NEDC i FTP-75 no opracowanie [9] po przebadaniu emisji we współrzędnych przyspieszenie i prędkość jazdy przy pominięciu faz zimnych składników spalin w trakcie hamowania. Zbiór rozmieszczenia punktów pomiarowych w testach jezdnych NEDC i FTP-75 we współrzędnych prędkość kątowa i przyspieszenie kątowe wału korbowego silnika przy pominięciu faz zimnych on the multinomial approximation (having excluded the data from cold starts). During the realization of the FTP-75 test the gearshifts were done according to the adopted plan presented in Fig. 5 and 6
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