Closed Loop Pressure Control System Development for an Automatic Transmission
Date Published: 2009-04-20
Paper Number:2009-01-0951
DOI: 10.4271/2009-01-0951
Citation:
Zheng, Q., Kraenzlein, J., Hopkins, E., Moses, R. et al., "Closed Loop Pressure Control System Development for an Automatic Transmission," SAE Technical Paper 2009-01-0951, 2009, doi:10.4271/2009-01-0951.
This paper presents the development of a transmission closed loop pressure control system. The objective of this system is to improve transmission pressure control accuracy by employing closed-loop technology. The control system design includes both feed forward and feedback control. The feed forward control algorithm continuously learns solenoid P-I characteristics. The closed loop feedback control has a conventional PID control with multi-level gain selections for each control channel, as well as different operating points. To further improve the system performance, Robust Optimization is carried out to determine the optimal set of control parameters and controller hardware design factors. The optimized design is verified via an L18 experiment on spin dynamometer. The design is also tested on vehicle.
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