초록 ▼

A method of estimating the airflow into a compression ignition engine having an exhaust gas recirculation system (EGR) and a variable geometry turbocharger (VGT). The method includes the steps of generating an EGR flow value as a function of the intake manifold pressure (MAP), exhaust manifold press

A method of estimating the airflow into a compression ignition engine having an exhaust gas recirculation system (EGR) and a variable geometry turbocharger (VGT). The method includes the steps of generating an EGR flow value as a function of the intake manifold pressure (MAP), exhaust manifold pressure (EXMP), position of the exhaust gas recirculation valve, and temperature of the gas flowing through the EGR. From this calculation, the method generates an intake airflow value (MAF) as a function of the EGR flow value and the intake aircharge temperature. The intake airflow value is used, in turn, to control the position of the EGR valve. The disclosed method thereby eliminates the necessity for a MAF sensor.

대표청구항 ▼

[ What is claimed is:] [1.] A method of calculating the airflow into a compressor of a turbocharged compression ignition engine having an exhaust gas recirculation system having a valve connecting an intake manifold and exhaust manifold of the engine, the method comprising the steps of:generating an

[ What is claimed is:] [1.] A method of calculating the airflow into a compressor of a turbocharged compression ignition engine having an exhaust gas recirculation system having a valve connecting an intake manifold and exhaust manifold of the engine, the method comprising the steps of:generating an intake pressure value (p.sub.1) which is indicative of the intake manifold pressure;generating an exhaust pressure value (p.sub.2) which is indicative of the exhaust manifold pressure;determining a first value (.alpha..sub.egr) indicative of the position of the exhaust gas recirculation valve;determining a first temperature value (T.sub.21) indicative of the temperature of the exhaust gas flowing through the exhaust gas recirculation system;determining a second temperature value (T.sub.c1) indicative of the temperature of the aircharge entering the intake manifold of the engine;generating an exhaust gas recirculation flow value (W.sub.21) as a function of p.sub.1, p.sub.2, T.sub.21, and .alpha..sub.egr ; andgenerating a compressor airflow value (W.sub.c1) as a function of said exhaust gas recirculation flow value (W.sub.21) and said second temperature value (T.sub.c1), said compressor airflow value being used to control the position of said exhaust gas recirculation valve.