A comparison of idle speed control schemes

This paper examines the idle speed regulation control problem in multi-poin t spark ignited petrol engines. Several possible solutions are presented, i ncluding proportional plus integral control, fuzzy logic control, adaptive fuzzy logic control, adaptive fuzzy logic control in conjunction with Smith prediction and dynamic matrix control. All of the controllers are compared in simulation and. where possible, on a production vehicle. The performanc e measures used for comparison purposes were mean-square error and maximum error. It is shown that there are several possible alternatives to the exis ting proportional plus integral control used on the air bypass valve of pro duction vehicles. (C) 2000 Elsevier Science Ltd. All rights reserved.