LOW TEMPERATURE EGR SYSTEM USING VORTEX TUBE AND ITS CONTROLLING METHOD

摘要

Disclosed is a low pressure (LP) EGR system of an engine system having an intake line connected to an intake manifold on which a compressor of a turbocharger is installed, and an exhaust line connected to an exhaust manifold on which a turbine of the turbocharger is installed. The LP EGR system comprises: an exhaust gas collection line whose one end is connected to the exhaust line between an exhaust gas post-processing filter and a flap valve whose other end is connected to the intake line from an upstream side of a compressor of the turbocharger; a vortex tube installed in the exhaust gas collection line to separate the exhaust gas supplied from the exhaust line into high temperature gas, and low temperature gas to supply the low temperature gas to the intake line; an LP EGR valve installed in the exhaust gas collection line to selectively connect the exhaust line and the intake line; and a controller to control the LP EGR valve.