Application of a Quasi-Dimensional Combustion Model to the Development of a High-EGR VVT SI Engine Dipartimento di Ingegneria Meccanica per lEnergetica - Università di Napoli "Federico II" Italy

Format:

Conference/Event

Author/Creator:

Bozza, F., author.

Conference Name:

7th International Conference on Engines for Automobile (2005-09-11 : Naples, Italy)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Naples, ITALY Consiglio Nazionale delle Ricerche 2005

Summary:

The paper reports the research activity related to the development of a High Exhaust Gas Recirculation (EGR) Spark-Ignition (SI), 8 valve engine equipped with a variable valve timing (VVT) device. The latter imposes an equal phase displacement on both intake and exhaust camshafts (dual dependent cam phaser).Both experimental and theoretical analyses are carried out to characterize the performance of this engine architecture, and particularly to analyze the combustion process arising at low load and high EGR conditions. To this aim, a quasi-dimensional model for the simulation of the burning process is included as an external user-defined routine in a commercial 1D simulation code (GT-Power®).The whole model is validated at both wide open throttle (WOT) conditions and part-load, and then it is mainly utilized to find, by means of a parametric analysis, the lowest fuel consumption at low load. Proper values of camshaft phasing, spark advance, butterfly-valve opening and EGR ratio are so defined in these operating conditions.In addition, the user modified 1D code is also linked to an external optimizer (ModeFrontier®) to verify if additional improvements can be gained when a different phasing is specified for intake and exhaust camshaft (dual independent cam phasers)

Notes:

Vendor supplied data

Publisher Number:

2005-24-070

Access Restriction:

Restricted for use by site license