Modelling of the Warm-up of a Spark Ignition Engine: Application to Hybrid Vehicles Ecole Centrale de Nantes

Format:

Conference/Event

Author/Creator:

Dubouil, Dubouil, author.

Contributor:

Hetet, J. F.

Maiboom, A.

Conference Name:

SAE International Powertrains, Fuels and Lubricants Meeting (2011-08-30 : Kyoto, Japan)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

One of the main advantage of a hybrid thermal-electric vehicleis that the internal combustion engine (ICE) can be shut down whennot needed anymore (Stop&Start system, propulsion withfull-electric mode), thus reducing fuel consumption. But this useof the ICE impacts its thermal behavior because of a lack of heatsource and thermal losses. Furthermore, the ICE is sometimes usedwith higher load in order to charge the batteries that increasesthe total heating power produced by the combustion. Therefore, thesimulation of hybrid vehicles becomes really interesting toevaluate the effect of different control strategies (energyrepartition between the engine and the electric motor) on the fuelconsumption. However, in most of actual hybrid vehicles simulationtools, for calculation speed reasons, the thermal phenomena areeither not taken into account, or their calculation is not based onphysical equations (empirical formulas). Their predictivecapability is then limited.The global aim of this study is the development of a simulationtool (using the Amesim® software) for hybrid electric vehicle whichtakes into account most of the thermal phenomena occurring in thevarious components and between them without increasing thecalculation time. In this paper, we first focus on thermalphenomena occurring in the spark ignition ICE. The coupling of acombustion model with a thermal model of the engine cooling systemand its metal parts allows a simulation of its warm-up after a coldstart. The thermal transfers between the different thermal inertiaare computed and their dependence with different parameters likespeed or load is evaluated. Research about the heating speed of thecooling water and the lubricating oil (due to the viscous frictionand dependent of the global thermal state of the ICE) areinteresting in order to find the best use of the ICE and thereforereducing the fuel consumption. Finally, the model of the engineincluding the thermal transfers is integrated in a simulation ofthe whole vehicle.The thermal behavior of two vehicles (a conventional and aparallel hybrid electric) using the same spark ignition engine isfinally presented. The first results show that the thermalphenomena have a significant impact on the final consumption of thevehicles

Notes:

Vendor supplied data

Publisher Number:

2011-01-1747

Access Restriction:

Restricted for use by site license