Supervised Optimization of Fuel Ratio in IC Engine Based on Design Baseline Computed Fuel Methodology

Abstract

Internal co mbustion (IC) engines are optimized to meet exhaust emission requirements with the best fuel economy. Closed loop combustion control is a key technology that is used to optimize the engine combustion process to achieve this goal. In order to conduct research in the area of closed loop combustion control, a control oriented cycle-to-cycle engine model, containing engine combustion information for each individual engine cycle as a function of engine crank angle, is a necessity. In this research, the IC engine is modeled accord ing to fuel ratio, wh ich is represented by the mass of air. In this research, a mult i-input-mu ltioutput baseline co mputed fuel control scheme is used to simu ltaneously control the mass flow rate of both port fuel injection (PFI) and direct in jection (DI) systems to regulate the fuel ratio of PFI to DI to desired levels. The control target is to maintain the fuel ratio at stoichiometry and the fuel ratio to a desired value between zero and one. The performance of the baseline computed fuel controller is co mpared with that of a baseline proportional, integral, and derivative (PID) controller.