An Integrated Powertrain (IPT) Model - Stage One

The need to reduce fuel consumption and CO₂ emissions while meeting future emission legislation has lead to the investigation of alternative engines, transmissions, aftertreatment and control strategies. The evaluation of alternative configurations at the concept stage requires vehicle drive cycle simulation tools, which include the following features:

• Fast run-time
• Alternative transmission models
• Cold start effects on fuel consumption and emissions modeled
• After-treatment models.

This paper describes the development of a MATLAB/SIMULINK^TM - based drive cycle simulation model meeting these requirements. The paper includes validation data comparing fuel consumption, engine-out and tailpipe emissions for a direct injection gasoline vehicle with a stoichiometric/lean switching strategy and lean NOx catalyst.

This detailed model based on steady state experimental data, is the first stage of a longer term study aimed at providing a more complete analysis tool for fuel consumption and emissions evaluation to support the development of powertrain control algorithms