Patent ID: 8769936
Filing Date: 2014-07-08
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A method for monitoring a regulated emission concentration (Ci) in the exhaust gas of an internal combustion engine, comprising: directing the exhaust gas through an exhaust-gas turbocharger; directing at least a portion of the exhaust gas through an exhaust-gas recirculation (EGR) system; measuring an air ratio (λmeas) in the exhaust gas with a lambda probe; measuring a rotational speed (nT) of the exhaust-gas turbocharger with a sensor; estimating the portion of the exhaust gas directed through the exhaust-gas recirculation system based on the rotational speed (nT) of the exhaust gas turbocharger; and determining the regulated emission concentration (Ci) based on the air ratio (λmeas) and the estimated portion of the exhaust gas.