Patent ID: 7195007
Filing Date: 2007-03-27
Classification: F02D,F02M,Y02T

Abstract:
1. An apparatus for calculating an amount of a recirculated exhaust gas for an internal combustion engine, the engine having an intake pipe and an exhaust pipe, the intake pipe downstream of an throttle valve and the exhaust pipe being connected with each other via an exhaust gas recirculation passage, and an exhaust gas recirculation control valve for controlling an amount of recirculated exhaust gas flowing through the exhaust gas recirculation passage being disposed in the exhaust gas recirculation passage, the apparatus comprising: means for expressing a difference between a cylinder-charged air amount in an engine steady operation with the recirculated exhaust gas being not supplied, and the cylinder-charged air amount in the engine steady operation with the recirculated exhaust gas being supplied, with a function expression of an intake pipe pressure, and for obtaining and storing the function expression in advance, the cylinder-charged air amount being an amount of fresh air charged in a cylinder, and the intake pipe pressure being a pressure in the intake pipe downstream of the throttle valve; means for obtaining the intake pipe pressure; and means for calculating the difference from the obtained intake pipe pressure using the function expression, and for calculating an exhaust gas recirculation control valve passing-through gas amount, which is an amount of the recirculated exhaust gas passing through the exhaust gas recirculation control valve when the exhaust gas recirculation control valve is opened, based on the difference.