Abstract
Abstract In this paper we analyze the nonlinear dynamic behavior of an internal exhaust gas recirculation system based on the mean-value model of an experimental engine equipped with a camshaft phaser. We develop a dynamic camshaft timing schedule that regulates the internal exhaust gas recirculation system while maintaining transient engine torque response similar to an engine with zero exhaust gas recirculation. The dynamic schedule consists of a steady-state map of the camshaft timing for optimum exhaust gas recirculation based on throttle position and engine speed, and a first order lag that regulates the transition of the camshaft timing to the optimum point. A scheme for adjusting the time constant of the first order lag depending on engine speed and throttle position is described.
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