Re-optimization of a Euro 5 Engine on WLTC Cycle using Global Calibration Approach English Free Members only

  • Category Technical paper
  • Related event International Congress : SIA Powertrain - Rouen 2014 - 21 & 22 May 2014
  • Edition SIA
  • Date 05/21/2014
  • Author A. Borràs Nadal, M. Castagné, F. Nicolas - IFP Energies Nouvelles | Y. Bernard - D2T
  • Language English
  • Type PDF file (563.89 Ko)
    (Downloadable immediately on receipt of online payment)
  • Number of pages 10
  • Code R-2014-02-27
  • Fee Free

The new driving cycle WLTC has been developed to harmonize regulations on vehicles all over the world and to enable a more realistic assessment of pollutant emissions. The main impact for Diesel engines would certainly concern an enlargement of the EGR (exhaust gas recirculation) working area in order to get low level of NOx engine-out emissions.
Before thinking to a possible technical change of hardware and control methods, one aim of this paper is to assess the behaviour of current engines in new driving cycle conditions. That requires a new optimized tuning to evaluate which level of pollutant emissions can be reached in those conditions. A calibration work has been carried out in steady-state conditions on a 1.5 litre diesel engine, thanks to model based calibration methods. The calibration software platform ICE² has been operated to perform the global DoE (Design of Experiments) approach used for the study. ICE² is an advanced model based calibration tool developed by IFPEN and commercialized by its subsidiary D2T.
During the realization of the whole global calibration workflow, a particular methodology has been achieved to model the limits of the domain for air path parameters before carrying out the DoE.
Last part deals with on-going developments of calibration methods and capability of the model based tool. Recent works taking coolant temperature into account and depending on engine response models are also presented. The application of such models for cold start cycle calibrations and engine after treatment system interactions are discussed.