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Continuous Online Oil Consumption Measurement with the SO 2 Tracer Method
Technical Paper
2011-01-2404
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Environmental issues have a significant influence on the
development of modern combustion engines. Particularly the
tightening of emission limits in Europe and the USA have to be
considered in the development process. One issue that influences
the emissions of engines is the oil consumption of the engine and
thus the reduction of the oil consumption of combustion engines has
gained importance in recent years. In order to optimize the oil
consumption of the engine a measurement technique is needed that
allows a very accurate detection of the engine oil consumption for
steady state as well as for transient engine operation points.
Since conventional measurement techniques provide only limited
accuracy at long measuring times and are only applicable for steady
state engine operation new methods for the online detection of the
engine oil consumption have to be established. New methods for the
oil consumption measurement are the tracer methods. Here, a tracer
substance in the oil is used that can be detected in the exhaust
gas. The actual oil consumption of the engine can then be
calculated with the measured concentration of the tracer substance.
One of the tracer methods is the SO2 tracer method. For this method
sulfur is used as tracer in the engine oil. The oil consumption is
calculated with the occurring sulfur dioxide (SO₂) in the exhaust
gas.
The aim of this study was the implementation of the SO₂ tracer
method at the Combustion Engines and Emission Control Laboratory at
the University of Applied Sciences Regensburg. The detection of the
SO₂ concentration in the exhaust gas was done by means of an IMR
mass spectrometer. For the implementation and validation of the
measurement setup was done by comparing the achieved results of the
SO₂ tracer method to gravimetric oil consumption measurement
results. For this purpose measurements with steady state and
transient engine operation were carried out with the parallel
measurement of the engines oil consumption with both techniques.
Thereby the main focus was on low engine operation points because
there low oil consumption rates are supposed to occur and thus the
oil consumption measurement is most challenging there. Besides the
validation of the measurement setup the influence of the engine
operation mode and cylinder modifications was investigated.
Therefore measurements with steady state and transient engine
operation as well as single cylinder measurements on cylinders, on
which special modifications had been applied, were carried out
using the SO₂ tracer method for calculation the oil
consumption.
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Authors
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Citation
Artmann, C. and Rabl, H., "Continuous Online Oil Consumption Measurement with the SO2 Tracer Method," SAE Technical Paper 2011-01-2404, 2011, https://doi.org/10.4271/2011-01-2404.Also In
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