Method of estimation of the pressure drop between two sections of the exhaust line of an internal combustion engine

摘要

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 ).