MCMAC--CVT: a novel on-line associative memory based CVT transmission control system

  • Authors:
  • K. K. Ang;C. Quek;A. Wahab

  • Affiliations:
  • Delphi Automotive Systems, Singapore Private Limited, 501 Ang Mo Kio Industrial Park 1, Singapore, Singapore 569621;Intelligent Systems Laboratory, School of Computer Engineering, Nanyang Technological University, Block N4 #2A-36, Nanyang Avenue, Singapore, Singapore 639798;Intelligent Systems Laboratory, School of Computer Engineering, Nanyang Technological University, Block N4 #2A-36, Nanyang Avenue, Singapore, Singapore 639798

  • Venue:
  • Neural Networks
  • Year:
  • 2002

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Abstract

This paper describes a novel application of an associative memory called the Modified Cerebellar Articulation Controller (MCMAC) (Int. J. Artif. Intell. Engng, 10 (1996) 135) in a continuous variable transmission (CVT) control system. It allows the on-line tuning of the associative memory and produces an effective gain-schedule for the automatic selection of the CVT gear ratio. Various control algorithms are investigated to control the CVT gear ratio to maintain the engine speed within a narrow range of efficient operating speed independently of the vehicle velocity. Extensive simulation results are presented to evaluate the control performance of a direct digital PID control algorithm with auto-tuning (Trans. ASME, 64 (1942)) and anti-windup mechanism. In particular, these results are contrasted against the control performance produced using the MCMAC (Int. J. Artif. Intell. Engng, 10 (1996) 135) with momentum, neighborhood learning and Averaged Trapezoidal Output (MCMAC-ATO) as the neural control algorithm for controlling the CVT. Simulation results are presented that show the reduced control fluctuations and improved learning capability of the MCMAC-ATO without incurring greater memory requirement. In particular, MCMAC-ATO is able to learn and control the CVT simultaneously while still maintaining acceptable control performance.