2009-01-0725 Drivability Development Based on CoSimulation of AMESim Vehicle Model and Simulink HCU Model for Parallel Hybrid Electric Vehicle Jeongho Hong, Seokjoon Kim and Byungsoon Min Hyundai Motor Company Copyright © 2009 SAE International ABSTRACT Parallel Hybrid Electric Vehi cle consists of internal combustion engine, engine clutch, motor, automatic transmission, Integrated Star ter Generator (ISG), and battery. Due to hybridizations such as using engine clutch to disengage the internal combustion engine and omitting torque converter from the automatic transmission to increase fuel economy, drivability will not be same as conventional vehi cle. To ensure drivability comparable to conventional vehicle, dynamic simulation has been utilized to foresee the drivability issues for the proposed hybrid system and i deas for improvements are tested in simulation. CoSimulation of AMESim vehicle model and Simulink Hybrid Control Unit (HCU) model has been used to test and improve HCU logic. INTRODUCTION Fuel economy has been main driving force for the hybrid electrical vehicle (HEV) development. Early in the development, good fuel economy could ensure sales of HEVs even with somewhat less than comparable drivability to conventional v ehicle. However, nowadays, there are lots of competitions among HEV manufacturers and customer’s drivability expectations are getting high and high. In order to be competitive in today’s various HEVs manufactured, not only good fuel economy is necessary, but also drivability has to be at least comparable to or better than conventional vehicle. The proposed hybrid system in this paper is Parallel Hybrid Electric Vehicle. For fuel economy, torque converter has been removed and engine clutch has been included. Due to those hybr idization, drivability will suffer compared to conventional vehicle with automatic transmission. Expected drivability problems are as follows [1]: y Vehicle response and vibration as engine clutch engages/disengages y Vehicle response and vibration as gear shifts up/down y Tip-in/out shock/jerk Fuel economy benefit of removing torque converter has been well established in [2]. And it was also shown in [2] that gear shift quality with and without torque converter can be comparable. Usually, it is relatively easy to find and explain mechanism for the drivability problems in simulation rather than with vehicle hardware analysis [3]. Though, it would be more convincing if vehicle hardware analysis can be done. In this paper, to ensure drivability of Parallel HEV comparable to conventional vehicle, dynamic simulation has been utilized to analyze the drivability issues for the proposed hybrid system and ideas for improvements are tested in simulation. This processes of analyzing and testing in simulation will save time and cost when compared to vehicle hardware approaches. The Engineering Meetings Board has approved this paper for publication. It has su ccessfully completed SAE’s peer review process under the supervision of the session organizer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form o r by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. ISSN 0148-7191 Positions and opinions advanced in this paper are those of the author(s) and not nec essarily those of SAE. The author is solely responsible for the content of the paper. SAE Customer Service: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: [email protected] SAE Web Address: http://www.sae.org Printed in USA *9-2009-01-0725*Downloaded from SAE International by Univ