Patent ID: 6095127
Filing Date: 2000-08-01
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method of controlling the fueling rate of a compression ignition engine having an exhaust gas recirculation (EGR) system having an EGR valve connecting an intake manifold and exhaust manifold of the engine, and a turbocharger including a compressor and a turbine, the method comprising the steps of:generating a compressor airflow value (W.sub.c1 (k)) indicative of the mass airflow into the turbocharger compressor;generating a recirculation flow value (W.sub.21 (k)) indicative of the flow of exhaust gas through the EGR system;generating an intake flow value (W.sub.1e (k)) indicative of the flow from the intake manifold into the engine;generating an intake burnt gas fraction value (F.sub.1 (k));determining a start of fuel injection value (SOI(k)) as a function of engine speed and fueling rate;determining the requested fueling rate (W.sub.f,Ras a function of accelerator pedal position and engine speed;determining a predicted exhaust gas air/fuel ratio (.lambda..sub.e (k));generating an exhaust gas air/fuel ratio limit (.lambda..sub.lim (k)); anddelivering fuel to the engine (W.sub.f (k)) as a function of .lambda..sub.e (k), .lambda..sub.lim (k), SOI(k), W.sub.f,RF.sub.1 (k) and W.sub.1e (k).