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Torque Converter Launch and Lock with Multi-Input Multi-Output Control
Technical Paper
2021-01-0422
ISSN: 2641-9637, e-ISSN: 2641-9645
Annotation ability available
Sector:
Event:
SAE WCX Digital Summit
Language:
English
Abstract
A torque converter is a type of fluid coupling device used to transfer engine power to the gearbox and driveline. A bypass clutch equipped in a torque converter assembly is a friction element which when fully engaged, can directly connect the engine to the gearbox. The torque converter is an important launch device in an automatic transmission which decouples engine speed from gearbox input speed while providing torque multiplication to drive the vehicle. During partial pedal launch, it is desired to engage the bypass clutch early and reduce the converter slippage in order to reduce power loss and achieve better fuel economy. However, engaging the bypass clutch early and aggressively may disturb the wheel torque and cause unpleasant driving experiences. This paper describes a multi-input multi-output (MIMO) control method to coordinate both engine and converter bypass clutch to simultaneously deliver desired wheel torque and reduce converter slippage. The proposed control method leverages a feedforward control derived from a standard converter hydrodynamic model and a Linear-quadratic regulator (LQR) feedback control. It considers the desired gearbox input torque and converter slippage as two control targets and engine torque and bypass clutch capacity as two control inputs to achieve the targets. This method enables aggressive converter lock-up without degrading driveability and will potentially improve calibration efficiency.
Authors
Citation
Xu, Y., Dai, E., Chen, W., Ford, S. et al., "Torque Converter Launch and Lock with Multi-Input Multi-Output Control," SAE Int. J. Adv. & Curr. Prac. in Mobility 3(5):2317-2324, 2021, https://doi.org/10.4271/2021-01-0422.Also In
SAE International Journal of Advances and Current Practices in Mobility
Number: V130-99EJ; Published: 2021-10-20
Number: V130-99EJ; Published: 2021-10-20
References
- Mercure , R.A. Review of the Automotive Torque Converter SAE Technical Paper 790046 1979 https://doi.org/10.4271/790046
- Tsangarides , M.C. and Tobler , W.E. Dynamic Behavior of a Torque Converter with Centrifugal Bypass Clutch SAE Technical Paper 850461 1985 https://doi.org/10.4271/850461
- Tsangarides , M.C. , Tobler , W.E. , and Heermann , C.R. Interactive Computer Simulation of Drivetrain Dynamics SAE Technical Paper 850978 1985 https://doi.org/10.4271/850978
- Ejiri , E. and Kubo , M. Performance Analysis of Automotive Torque Converter Elements Journal of Fluids Engineering 121 2 266 275 1999
- Hrovat , D. and Tobler , W.E. Bond Graph Modeling of Automotive Power Trains Journal of the Franklin Institute 328 5 623 662 1991
- Asl , H.A. , Azad , N.L. , and McPhee , J. Modeling Torque Converter Characteristics in Automatic Drivelines: Lock-Up Clutch and Engine Braking Simulation Presented at ASME 2012 International Design Engineering Technical Conferences and Computers And Information in Engineering Conference US Aug 12-15 2012
- Zhang , Y. , Haria , H. , Hippalgaonkar , R. , Pietron , G. , and Fujii , Y. Automatic Transmission Shift Control for Cancelling Inertia Torque SAE Technical Paper 2018-01-1167 2018 https://doi.org/10.4271/2018-01-1167
- Otanez , P. , Samie , F. , Lee , C.J. , and Kao , C.K. Aggressive Torque Converter Clutch Slip Control and Driveline Torsional Velocity Measurements SAE International Journal of Fuels and Lubricants 1 1 883 892 2009 https://doi.org/10.4271/2008-01-1584
- Liu , Z. , Lei , Y. , Zheng , H. , Fu , Y. et al. Slip and Lock up Control of Torque Converter Clutch at Launching Conditions and Its Temperature SAE Technical Paper 2013-01-0357 2013 https://doi.org/10.4271/2013-01-0357
- Thompson , D.F. and Kremer , G.G. Parametric Model Development and Quantitative Feedback Design for Automotive Torque Converter Bypass Clutch Control Journal of Systems and Control Engineering 213 4 249 266 1999
- Michikoshi , Y. , Kusamoto , D. , Ota , H. , Ikemura , M. et al. Toyota New TNGA High-Efficiency Eight-Speed Automatic Transmission Direct Shift-8AT for FWD Vehicles SAE Technical Paper 2017-01-1093 2017 https://doi.org/10.4271/2017-01-1093
- Ota , K. , Kondo , M. , Shinohara , S. , Tsukamoto , N. et al. Driveability Improvement with Innovative Toyota 8 Speed Automatic Transmission Control SAE Technical Paper 2017-01-1109 2017 https://doi.org/10.4271/2017-01-1109
- Tsukamoto , N. , Chimbe , T. , Asami , T. , Ota , K. et al. Development of New Shift Control System Using a Model-Based Control Method for Toyota Stepped Automatic Transmission SAE Technical Paper 2017-01-1632 2017 https://doi.org/10.4271/2017-01-1632
- Liu , P. , Jiang , W. , Xu , Y. , McCullough , T. et al. A Particle Swarm Optimization-Based Method for Fast Parametrization of Transmission Plant Models SAE Technical Paper 2019-01-0344 2019 https://doi.org/10.4271/2019-01-0344
- Franklin , G.F. , Powell , J.D. , and Emami-Naeini , A. State-Space Design Feedback Control of Dynamic Systems Prentice Hall 2009 473 494
- David , J. , and Natarajan , N. Design of an Optimal Clutch Controller for Commercial Trucks Presented at American Control Conference US June 8-10 2005
- Phillips , A. , and Sahin , F. Optimal Control of a Twin Rotor MIMO System Using LQR with Integral Action Presented at 2014 World Automation Congress US Aug 3-7 2014
- Xu , Y. , Fujii , Y. , Dai , E. , McCallum , J. et al. Piecewise 1st Order Hydraulic Actuator Model for Transient Transmission Simulations SAE Technical Paper 2017-01-1140 2017 https://doi.org/10.4271/2017-01-1140
- Bai , S. , Maguire , J. , and Peng , H. Mechanics of Planetary Gear Automatic Transmissions Dynamic Analysis and Control System Design of Automatic Transmissions SAE International 2013 10 67