Approaches for transient emission reduction of heavy duty diesel engines

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Approaches for transient emission reduction of heavy duty diesel engines

Herrmann, O.E. / Queck, D. / Schnorbus, T. / Ruhkamp, L. / Laumen, H.J. / Mashida, M. / Uchiyama, K. / Takeuchi, K.

Post Stage IV (and Euro 6) HD diesel engines will require some further reduction in fuel consumption and system complexity. Ultra high injection pressure has been investigated as enabler to reduce soot emission up to 70% under steady state conditions. As a further investigation the potential to reach very low NO_x levels of 1.5 g/kWh and below has been investigated under transient conditions. This was done by optimizing a full load step at 1400 rpm (representative for NRTC cycle) at two different NO_x emission levels by means of air path and injection parameters. A NO_x reduction of 54 % has been achieved with same transient torque response and same fuel consumption. Under this condition the smoke emission rises drastically by factor seven. To reduce the transient smoke emission increasing the injection pressure from 2000 bar to 3000 bar helps 30 % (respectively 50 %). If finally improvement measures on the air path, like in this case the usage of low pressure EGR can be realized, further 54 % soot reduction has been shown to be possible. Finally a transient NO_x level between 1.5 g/kWh down to 1.25 g/kWh has been realized with a soot level which will not require any active regeneration.

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Document information

Title :

Approaches for transient emission reduction of heavy duty diesel engines

Contributors:

Herrmann, O.E. (author) / Queck, D. (author) / Schnorbus, T. (author) / Ruhkamp, L. (author) / Laumen, H.J. (author) / Mashida, M. (author) / Uchiyama, K. (author) / Takeuchi, K. (author)

Published in:

Aachener Kolloquium Fahrzeug- und Motorentechnik, 21, Aachen Colloquium Automobile and Engine Technology, 21 ; 219-235

Publication date :

2012

Size :

17 Seiten, 14 Bilder, 10 Quellen

ISBN :

978-3-940374-61-5

Type of media :

Conference paper

Type of material :

Language :