400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2008-01-1684 Research on Control Strategy of Shifting Progress Sun Wentao and Chen Huiyan Beijing Institute of Technology 2008 SAE Internati onal Powertrains, Fuels and Lubricants Congress Shanghai, China June 23-25, 2008Downloaded from SAE International by Columbia Univ, Monday, August 20, 2018By mandate of the Engin eering Meetings Board, th is paper has been approved for SAE publication upon completion of a peer review process by a minimum of three (3) industry experts under the supervision of the session organizer. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4028Fax: 724-776-3036 For multiple print copies contact: SAE Customer ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: Customer [email protected] ISSN 0148-7191Copyright © 2008 SAE InternationalPositions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE.The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send themanuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Columbia Univ, Monday, August 20, 2018Copyright © 2008 SAE International ABSTRACT Based on BF6M1015CP electronic diesel engine (it is a supercharged, water-cooled engine. It has 6 cylinders and it is for heavy-duty vehicle) and HD4070PR electronic automatic transmission (it covers heavy-duty applications requiring high input horsepower and torque. It contains torque converter module, control module, planetary module and output module. It has 7 forward gears and a power-take –off ˄PTO˅and a retarder), the paper analyzes the shift system of an electronic automatic transmission and sets up a mathematic module of the shifting process. With the model the shifting process is analyzed and the model can be used directly in shifting process control, and the rules of shifting process can be derived. To improve the shift quality, in the paper the different control methods in different phases are used and reviewed that Include the open-loop control, fixed ramp rate, and closed-loop control. Finally, though a bench test, the control strategy of the electronic automatic transmission was obtained. INTRODUCTION The clutch-to-clutch shift is the key enabler for a compact, low mass and low cost automatic transmission. Especially when the transmission has an extended number of speeds. For the past two decades, a variety of clutch-to-clutch shift control technologies have been developed to improve the shift quality. In the paper the different control methods in different phases are used. Including the open-loop control, fixed ramp rate, and Eüüengine, Lüülockup clutch ˈPüüpump, S üüstator ˈ Tüüturbine ˈC1üüC1 clutch ˈC2üüC2 clutch, W üü wheel. closed-loop control. The test results show that this new technology greatly improved the shift quality.MAIN SECTION Fig.2 The analysis of the shifting process Tnüüthe sun gear speed ˈJnüüthe carrier speed ˈ üüthe ring speed ˈQn JMüüthe carrier torque ˈ1CMüü the clutch 1 torque ˈ2CMüüthe clutch 2 torque ˈü ü the clutch 1 pressure ˈü ü the clutch 2 pressure 1CP 2CP2008-01-1684 Research on Control Strategy of Shifting Progress Sun Wentao and Chen Huiyan Beijing