Exhaust gas recirculation system

摘要

A method of estimating air charge temperature to an intake manifold of an internal combustion engine having an exhaust gas recirculation system with an EGR valve, comprising: determining a manifold charge temperature value using a temperature sensor in said intake manifold; determining an ambient air temperature value using a temperature sensor located external of an air cleaner assembly of said engine; estimating said air charge temperature from the ambient air temperature value and/or manifold charge temperature value depending on position of said EGR valve.