Low Pressure Exhaust Gas RECIRCULATION System

WARNING: This page is about a different variant/trim than selected.

The Low Pressure (LP) system takes exhaust gases from the exit of the Diesel Particulate Filter (DPF) system, and mixes it with the charge air from the intake air system into the turbocharger.

The gases are directed from the DPF outlet to the LP Exhaust Gas Recirculation (EGR) cooler via a pipe. The LP EGR cooler has no bypass mode, so only cools.

There is a simple mesh filter installed before the exhaust gases reach the outlet of the LP EGR cooler that prevents larger particles of soot from entering the turbocharger system.

The cooled gases are then directed through the LP EGR valve.

The valve consists of a pipe between the charge air duct and the turbocharger, with the butterfly valve covering the EGR inlet, in the centre bottom of the EGR valve.

The butterfly valve opens into the charge air stream, promoting both thorough mixing before the gas enters the turbocharger, and also provides suction to drive the LP EGR gas through the system.