Exhaust Gas Recirculation: Description and Operation

The EGR system can provide up to 35% exhaust gas recirculation. The EGR operates during all engine speed and load conditions. At wide open throttle, it provides a 5% recirculation rate. The EGR shuts down during high engine idle to avoid carbon build up on the valve. The EGR also deactivates if the EGR temperature is too high. The EGR also has a self cleaning function that opens and closes twice after the engine has been shut off to eliminate soot deposits.

EGR And Cooler:

Apart from the charge air distribution manifold and the mixing chamber, the intake manifold also includes a finned EGR cooler. Coolant flows through the cooler to reduce the temperature of the recirculated gas after it was cooled by running through the cylinder head. The management of this temperature significantly reduces emissions.