OUTLINE
This system is designed to reduce and control NOx formation due to a slight reduction of peak temperature in the engine combustion chamber, which is accomplished by introducing a small amount of inert gas into intake manifold.
By adopting the exhaust gas passage in the cylinder head, this makes it possible to lower the temperature of the exhaust gas and re-circulate the great amount of exhaust gas.
EGR valve position sensor has been provided on the EGR valve.