ESTIMATION OF ENGINE INTAKE AIR MASS FLOW USING A GENERIC SPEED-DENSITY METHOD
Typ dokumentu
článek v časopisejournal article
Peer-reviewed
publishedVersion
Autor
Vojtíšek M.
Kotek M.
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Measurement of real driving emissions (RDE) from internal combustion engines under real-world operation using portable, onboard
monitoring systems (PEMS) is becoming an increasingly important tool aiding the assessment of the effects of new fuels
and technologies on environment and human health. The knowledge of exhaust flow is one of the prerequisites for successful RDE
measurement with PEMS. One of the simplest approaches for estimating the exhaust flow from virtually any engine is its computation
from the intake air flow, which is calculated from measured engine rpm and intake manifold charge pressure and temperature
using a generic speed-density algorithm, applicable to most contemporary four-cycle engines. In this work, a generic speed-density
algorithm was compared against several reference methods on representative European production engines – a gasoline port-injected
automobile engine, two turbocharged diesel automobile engines, and a heavy-duty turbocharged diesel engine. The overall results
suggest that the uncertainty of the generic speed-density method is on the order of 10% throughout most of the engine operating
range, but increasing to tens of percent where high-volume exhaust gas recirculation is used. For non-EGR engines, such uncertainty
is acceptable for many simpler and screening measurements, and may be, where desired, reduced by engine-specific calibration.
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- Publikační činnost ČVUT [1325]