Abstract
The paper includes a brief description of the methodology of obtaining dynamic characteristics of four basic exhaust gas emissions: CO2, CO, HC and NOx based on combined data from road tests on the engine test beds NEDC and FTP-75. The characteristics developed through tests on a class C motor-car have been presented. The possible advantages thanks to the application of the dynamic characteristics developed have been indicated. The significant values of emission during engine braking have been pointed out. For a wider recognition of this area of dynamic characteristics, special chassis tests were carried out on the engine test bed, recording the emissions of the exhaust gas components listed in the modal system with 0.4 s rate in the test of full engine braking on III, IV and V gear. The results were summarized and assessed.
Highlights
As described in [1, 2, 3], while performing the road tests, most of the exhaust gas components are emitted after the engine cold start
The conclusion may be drawn that the emission level results obtained in the NEDC and FTP-75 road tests improperly reflect the effect of automotive contamination in the traffic analyses on transit routes and with higher average travel speeds with nominal temperature of the catalytic converter operation [8, 9]
It is proposed to assume such traffic conditions for the analysis as data collected from the exhaust gas components in the NEDC and FTP-75 road tests, excluding the cold phases
Summary
As described in [1, 2, 3], while performing the road tests, most of the exhaust gas components are emitted after the engine cold start. In the overall mileage of the car, the condition of engine operation with faultless catalytic converter is a fraction of the total vehicle driving time. The conclusion may be drawn that the emission level results obtained in the NEDC and FTP-75 road tests improperly reflect the effect of automotive contamination in the traffic analyses on transit routes and with higher average travel speeds with nominal temperature of the catalytic converter operation [8, 9]. It is proposed to assume such traffic conditions for the analysis as data collected from the exhaust gas components in the NEDC and FTP-75 road tests, excluding the cold phases. If emission is assumed as a function of speed and acceleration of the car (or speed and crankshaft angular acceleration of the engine crankshaft), the distribution of the measuring
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