ABSTRACT
This chapter presents an adaptive algorithm to adjust the gains of a vehicle speed control system. The feedback, or closed-loop portion of the control system, is fully effective only under steady-state conditions and when the exhaust gas oxygen (EGO) sensor has attained the proper operating temperature. The closed-loop problem is addressed from a modem control systems perspective, where individual cylinder control of air-fuel ratio is accomplished using a single EGO sensor. The chapter describes the development and implementation of an air charge estimator for an eight-cylinder engine. Engine idle is one of the most frequently encountered operating conditions for city driving. Feedforward control is considered as an effective mechanism to reject load disturbances, especially for small engines. As engine control systems have become more complex because of increased functionality, the old-fashioned trial-and-error approach has proved inadequate to achieve optimum performance for interactively connected systems.
