VERFAHREN ZUR EINSCHÄTZUNG DES DRUCKABFALLS ZWISCHEN ZWEI ABSCHNITTEN DER ABGASLEITUNG EINES VERBRENNUNGSMOTORS

A method for estimating a pressure drop (”p) between two sections of an exhaust line of a Diesel engine comprises the steps of - measuring a fresh air flow rate ( m a ) into the engine, - measuring a fuel flow rate ( m f ) into the engine, - calculating an exhaust gas flow rate ( M ) from said fresh air and fuel flow rates ( m a , m f ), - determining an estimated pressure drop (”p) as a function of said exhaust gas flow rate ( M ), characterized in that the exhaust gas flow rate ( M ) is calculated as a weighted sum of said fresh air and fuel flow rates ( m a , m f ) wherein a weighting factor (k) of the fuel flow rate ( m f ) is higher than a weighting factor of the fresh air flow rate ( m a ).