M Sc Thesis Project Proposal
Diesel exhaust gas measurement uncertainties
The exhaust emission legislation is getting more stringent, and this ensures that car manufacturers must supply
vehicles with full electronic control of engines and advanced exhaust after treatment technologies. In order to
comply with the low emission limits, pollutant concentrations of e.g. NOx, NO, NO 2, HC, CO, NH3 and N2O in
exhaust gases can be in the same range as in ambient air. This is very challenging, because with lower
concentrations the measurement uncertainty is increasing dramatically and it becomes difficult to measure
such low emission levels with sufficient accuracy.
The proposed scope of the project will consist of:
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Identification and quantification of noise sources in gas emission measurements under steady state and
transient engine test conditions.
Mapping the current measurement uncertainty level in the gas analysis equipment and make suggestions
and further development of established measurement methods in order to improve measurement quality.
The results of the project, if they turn out to be good, will be used as best practice in similar technology
centres globally.
The student appropriate for this work presumably is hands on with engines, has a flare for statistics and has, or
wants to develop, a deep knowledge in the measurement uncertainty of a diesel exhaust gas analysis,
combined with an interest to plan, carry out and analyse the results of measurements. If this sounds
interesting, please contact Ari Uusimäki (tel. 031-89 37 19, ari.uusimaki@matthey.com) at Johnson Matthey’s
technical centre in Gothenburg.
The work will be carried out at Johnson Matthey AB in Högsbo.
Johnson Matthey is an exclusively owned subsidiary of Johnson Matthey Plc, a leading manufacturer of exhaust catalysts to the international
automotive industry. At our technology center in Gothenburg, we develop catalytic converters for both heavy and light duty diesel engines.
We are currently 60 people working with development and customer support for the company's European customer base. At our disposal we
have 9 modern engine test cells, as well as service centers for measuring instruments and engines at our premises in Västra Frölunda.
Also visit www.matthey.com for a deeper introduction.