Pseudo-causal tracking control of a nonminimum phase system
Wang, P., Sahinkaya, M. N. and Akehurst, S., 2009. Pseudo-causal tracking control of a nonminimum phase system. In: Proceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009. New York: ASME, pp. 1201-1208.
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A novel method of implementing noncausal feedforward compensators causally, i.e. without requiring any future value of the reference input trajectory, is described. A hardware-in-the loop test facility developed for continuously variable transmissions is utilized in this paper. The test facility includes two induction motors to emulating engine and vehicle characteristics. Software models of engine and vehicle, running in real-time, provide reference torque and speed signals for the motors, which are connected to a transmission that is the hardware in the loop. Speed control of the output motor that emulates the vehicle dynamics is used to demonstrate an application of the proposed technique. A feedforward compensator, based on the transfer function inversion, is used to compensate for the nonminimum phase motor and drive system dynamics. The vehicle model can not be run ahead of time to provide the future values required by the noncausal inversion technique that requires the current torque at the output of the transmission, therefore, the feedforward controller has to be applied causally. A frequency domain estimation technique and a multi-frequency test signal are utilized to estimate, within the frequency range of interest, a low relative order transfer function of the closed loop system incorporating a manually added delay in the feedback loop. A noncausal feedforward controller is designed for the delayed output of the system based on the identified transfer function. It has been shown experimentally that this compensator oers excellent tracking performance of the motor when subjected a multi-frequency speed demand signal.
|Item Type||Book Sections|
|Creators||Wang, P., Sahinkaya, M. N. and Akehurst, S.|
|Departments||Faculty of Engineering & Design > Mechanical Engineering|
|Research Centres||Centre for Power Transmission & Motion Control|
Powertrain & Vehicle Research Centre
|Additional Information||2009 ASME Dynamic Systems and Control Conference, DSCC2009. 12-14 October 2009. Hollywood, CA, United States.|
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