Patent ID: 8453446
Filing Date: 2013-06-04
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method for controlling an exhaust gas control system for an internal combustion engine, the exhaust gas control system including: a turbocharger that includes a compressor arranged in an intake passage of the internal combustion engine, and a turbine arranged in an exhaust passage of the internal combustion engine; a low-pressure EGR unit that recirculates a portion of exhaust gas back to the internal combustion engine through a low-pressure EGR passage that provides communication between the exhaust passage, at a portion downstream of the turbine, and the intake passage, at a portion upstream of the compressor; and a low-pressure EGR valve that is provided in the low-pressure EGR passage, and that changes a flow passage area of the low-pressure EGR passage; the method, comprising: determining whether the internal combustion engine is under a predetermined low-temperature environment; executing an opening/closing control over the low-pressure EGR valve; and keeping the low-pressure EGR valve closed while an operation mode of the internal combustion engine is a fuel-supply cutoff operation mode, when it is determined that the internal combustion engine is under the predetermined low-temperature environment.