Presenters: Mr. Moresh Kolhe Mr. Babu Bhondave Mahindra & Mahindra (AFS) Copyright 2012 Mahindra & Mahindra Ltd. All rights reserved.

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1 Presenters: Mr. Moresh Kolhe Mr. Babu Bhondave Mahindra & Mahindra (AFS) 1

2 Overview of Presentation Introduction. Objective. PST valve model using Simulink-Simscape. Results and Summary Summary 2

3 Introduction Power shuttle transmission generally used in Tractors, consists of multiplate (wet) clutch and an additional hydraulic unit i.e. power shuttle valve. The Forward/Reverse operation with Power shuttle transmission provides better comfort, controllability and improves productivity especially in Loader-Dozer application.. The power shuttle valve is operated by a F/R lever. In forward position, the pressure is built in the forward clutch whereas in reverse position, the pressure is built in the reverse clutch. This pressure rise in the F/R clutch makes the vehicle to make in F/R direction. Flow to tank line is blocked during the flow to F/R clutch. 3

4 Objective To study the pressure modulation and effect of various parameters on pressure modulation of the Power shuttle valve. To optimize the pressure modulation curve for shifting jerks and delay. To reduce the no of trials to be done on actual vehicle for the purpose of optimization. 4

5 Power Shuttle Transmission F/R Lever Inching Pedal PST Valve PST Valve Reverse Clutch engaged and Forward Clutch disengaged Forward Clutch engaged and Reverse Clutch disengaged Pedal pressed, Clutch disengaged Pedal released, Clutch Engaged 5

6 PST Valve Model Power shuttle valve components like priority section, modulation section, inching section etc. are modelled. Operator input operates the F/R and inching control. Mathematical model for Spring and Constraints is developed in Simulink and for other components Simscape is used. Priority valve ensures a fairly constant flow rate from Pump to the F/R valve which also flows to modulation valve. F/R valve is connected to the Clutch which is engaged by the fluid pressure. Inching valve relieves the pressure in the clutch thereby allows inching of the vehicle. 6

7 PST Valve Model 7

8 Results Pressure v/s Time for F/R operation. 8

9 Results Pressure v/s Time for Inching operation. 9

10 Conclusion A optimized solution for this PST is obtained, which is very close to the actual requirement. Using this simulation for determining modulation curve, physical test needed for PST optimization reduced significantly. The results obtained from this kind of simulation provides not only basis for evaluation of PST valve performance but also for enhancement that can be done in the design. Other issues, if simulated and verified, they can be resolved at an early stage. Risk of introducing new concepts can be reduced with these kind of virtual validation 10

11 References H. Merrit, Hydraulic Control Systems, JohnWiley & Sons, INC, John S. Cundiff, Fluid Power Circuits and Controls (Fundamentals and Applications), CRC Press, Matlab-Simulink-Simscape users guide. Matlab-Simulink-Simscape Tutorials. 11

12 Thank you Acknowledgement I wish to express my warm thanks to Mahindra management for providing the opportunity to work on this project. Also I would like to express my sincere gratitude to Knowledge Management team for their support. Visit us at Disclaimer Mahindra & Mahindra herein referred to as M&M, and its subsidiary companies provide a wide array of presentations and reports, with the contributions of various professionals. These presentations and reports are for informational purposes and private circulation only and do not constitute an offer to buy or sell any securities mentioned therein. They do not purport to be a complete description of the markets conditions or developments referred to in the material. While utmost care has been taken in preparing the above, we claim no responsibility for their accuracy. We shall not be liable for any direct or indirect losses arising from the use thereof and the viewers are requested to use the information contained herein at their own risk. These presentations and reports should not be reproduced, re-circulated, published in any media, website or otherwise, in any form or manner, in part or as a whole, without the express consent in writing of M&M or its subsidiaries. Any unauthorized use, disclosure or public dissemination of information contained herein is prohibited. Unless specifically noted, M&M or any of its subsidiary companies is not responsible for the content of these presentations and/or the opinions of the presenters. Individual situations and local practices and standards may vary, so viewers and others utilizing information contained within a presentation are free to adopt differing standards and approaches as they see fit. You may not repackage or sell the presentation. Products and names mentioned in materials or presentations are the property of their respective owners and the mention of them does not constitute an endorsement by M&M or its subsidiary companies. Information contained in a presentation hosted or promoted by M&M is provided as is without warranty of any kind, either expressed or implied, including any warranty of merchantability or fitness for a particular purpose. M&M or its subsidiary companies assume no liability or responsibility for the contents of a presentation or the opinions expressed by the presenters. All expressions of opinion are subject to change without notice. 12

Cooling System Simulation for Indian Utility Vehicle using COOL3D

Indian GT SUITE Conference 2013 Cooling System Simulation for Indian Utility Vehicle using COOL3D Paper presented by Rishabh Pandey, M&M Gopakishore Gummadi, M&M Copyright 2012 Mahindra & Mahindra Ltd.