Low pressure EGR loops: future challenges facing upcoming systems English Free

  • Category Technical paper
  • Related event International Congress : SIA Powertrain - Rouen 2014 - 21 & 22 May 2014
  • Edition SIA
  • Date 05/21/2014
  • Author S. Potteau, G. Hodebourg, V. Huet, S. Leroux, K. Surbled - Valeo
  • Language English
  • Type PDF file (700.75 Ko)
    (Downloadable immediately on receipt of online payment)
  • Number of pages 8
  • Code R-2014-02-04
  • Fee Free

The diesel engines of today must adhere to ever more stringent emission regulations and at the same time respond to an increasing diversity of uses (e.g. cycles, end user profiles, etc.). To meet future emission regulations, the OEMs have deployed a vast range of technologies both at intake and exhaust level.
The EGR loop was developed 15 years ago and remains a key lever in decreasing NOx emissions to this day.
In this paper, we will first analyze the development of EGR technology, from its beginnings using a high pressure loop to the low pressure used today.
We will then concentrate on the low pressure EGR loop, which is the future of the technology. The OEMs have a large choice of architectures at their disposal, with the EGR valves, cooler and throttling (exhaust and intake) in different positions. Valeo has contributed to the field with its stand-alone components and combined function systems.
We will also present all the potential architectures of the LP EGR loop, and identify the pros and cons of each, including combined valve function at the exhaust or cooled end.
To support these analyses, we will use a 1D simulation model but also carry out engine and vehicle analyses.
To conclude, we will measure the benefits of each architecture and their impact on powertrain in general, including after treatment during cycles and also real-life usage.

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