Electronic control device for internal combustion engine with EGR control apparatus

Claim 1

An electronic control device for controlling an internal combustion engine by means of a control value, said engine having an intake pipe, an exhaust pipe, an exhaust gas recirculating passage extending between said exhaust pipe and said intake pipe, and a vacuum-operated control valve arranged in said exhaust gas recirculating passage, said electronic control device comprising: first detecting means for detecting a revolutional speed of said engine; second detecting means for detecting an intake pressure in said intake pipe; third detecting means for detecting an atmospheric pressure; first calculating means for calculating a fundamental value of said control value in response to said intake pressure and said revolutional speed; second calculating means for converting said detected intake pressure under said detected atmospheric pressure into a converted intake pressure under a predetermined atmospheric pressure in response to said atmospheric pressure; third calculating means for calculating a correcting value of said control value in response to said revolutional speed and said converted intake pressure, said correcting value being in correspondence with an amount of recirculated exhaust gas attained under said predetermined atmospheric pressure when said vacuum-operated control valve is opened; and control means for controlling engine operation in response to said fundamental value when said vacuum-operated control valve is closed, and in response to said fundamental value and said correcting value when said vacuum-operated control valve is opened.