A Methodology for Modelling the Cat-Heating Transient Phase in a Turbocharged Direct Injection Spark Ignition Engine

Paper #:
  • 2017-24-0010

Published:
  • 2017-09-04
Abstract:
This paper presents the modelling of the transient phase of catalyst heating on a high performance turbocharged spark ignition engine with the aim to accurately predict the exhaust thermal energy available at the catalyst inlet and to provide a “virtual test rig” to assess different design and calibration options. The entire transient phase starting from the engine cranking until the catalyst warm-up is completed was taken into account in the simulation and the model was validated by means of a wide data-set of experimental tests. The first step of the modelling activity was the combustion analysis during the transient phase: the burn rate was evaluated on the basis of experimental in-cylinder pressure data, taking into account both cycle-to-cycle and cylinder-to-cylinder variations. Then, as far as the exhaust temperatures are concerned, a detailed model of the thermocouple was implemented in order to replicate the physical behavior of the sensor during the warm-up and to compare the simulated temperature with the measured one. Finally, a complete analysis of the energy balance during the transient was carried out: the thermal power available to the catalyst inlet was obtained from a complete analysis of power losses (i.e. friction and pumping losses, in-cylinder heat transfer, engine block and engine coolant heating, exhaust manifold heat transfer, etc.). In conclusion, the proposed methodology allows to reliably simulate in details the Cat-Heating transient, showing a valuable potential in driving the main design and calibration choices during the engine development process.¬¬
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