Hybrid Powertrain Simulations

As.ing. Valerian CROITORESCU, As.ing. Andrei MACIAC, Prof.dr.ing. Mircea OPREAN, Prof.dr.ing. Alexandru MARIN, Prof.dr.ing. Cristian ANDREESCU 

ABSTRACT: The requirements of the EURO 5 (in the 1st decade of 2009) and EURO 6 norms (maybe in 2012 or later) in Europe and the requirements in US and Japan to reduce the harmful gases and CO2 emissions from vehicles increased the interest of the car manufacturers in developing new technologies for automotive propulsion systems, among which the hybrid propulsion systems have a major importance. The purpose of this paper is to create models and simulate the operation of several hybrid architectures, trying to find out the advantages and disadvantages of each other.The next types of hybrid powertrain solutions has been analyzed: Serial hybrid with clutch between two electric motors, Combined hybrid with clutch between two electric motors, Parallel `through the road` hybrid (TTR), Parallel hybrid with motor-generator `Between two clutches` and also a mixt hybrid powertrain with `power splitting device`.Some standard components and common parameters which remain the same for all hybrid solutions have been considered.


published on 20/10/2008, 12:05

Modélisation et simulation du démarrage d’un véhicule à boite de vitesses automatique avec les bond graphs


Résumé—L’article présente une méthodologie de modélisation et simulation d’un système de propulsion pour un automobile. Le moteur thermique est couplé aux roues arrière par une boite de vitesses automatique (BVA) à six rapports. L’activité de modélisation et les simulations sont faites en bonds graphs. Pour cet article on modélise les premières secondes du démarrage, y compris le changement montant 1-2, sous charge. Deux versions du passage sont également analysées : sous roue-libre et «clutch-to-clutch». D’autre part, de coté modélisation, ça se peut faire soit en philosophie «stick-slip», soit «all-time-slipping». Le passage est commandé par un système hydraulique qui suivit une consigne de pression dans le frein qui applique.

Mots clés—bond graph, transmission automatique, train épicycloïdal, stick-slip, all-time-slipping.
published on 20/11/2008, 14:09

Models of Automotive Transmissions for Fuel Consumption Studies

Marius V. BATAUS, Florin D. DRAGNE, Ioan M. OPREAN, Nicolae VASILIU 

ABSTRACT: In the last years more and more transmission types are developed in order to respond to the ever-increasing demands on fuel economy and environment protection. Also previously standard configurations are optimized in order to meet the new requirements.
To choose an appropriate configuration in respect with the desired application and to correctly dimensioning it is a difficult task for which the numerical simulation is a very useful tool. In consequence models of transmissions suitable for fuel consumption studies are necessary in order to have a rapid evaluation of envisaged solutions. Nevertheless, the comfort is a key issue that cannot be ignored and the level of modelling must allow a basic comfort evaluation.
This paper aims to show typical modelling and simulation issues that occur in automotive transmissions studies. The models are compared using the 1D multi-domain simulation platform LMS Imagine.Lab AMESim.

published on 30/09/2009, 16:45    


ABS valve model simplification using LMS Imagine.lab – AMESim

Florin Daniel DRAGNE, Marc ALIRAND, Ioan Mircea OPREAN, Nicolae VASILIU 

ABSTRACT: The aim of the paper is to build and validate a model of ABS/ESP valve with LMS Imagine.lab - AMESim. A functional model was obtained by reducing the initial complex model using different model reduction tecniques like activity index and state count. Different levels of valve model were considered in order to keep the time continuity and to evaluate the simplification techniques. Both steady-state and dynamic behavior of the model was validated by experimental data.


published on 30/09/2009, 17:27