Patent ID: 7926272
Filing Date: 2011-04-19
Classification: F01N,F02B,F02M

Abstract:
1. An exhaust gas recirculation system for an internal combustion engine having an intake passage and an exhaust passage, comprising: a supercharger driven by an exhaust gas flowing through the exhaust passage; an exhaust gas cleaner, disposed in the exhaust passage, for cleaning exhaust gas; and a low pressure exhaust gas recirculation system including: a low pressure exhaust gas recirculation passage connecting a downstream portion of the exhaust gas cleaner in the exhaust passage to an upstream portion of the supercharger in the intake passage; and a device for trapping foreign particles contained in exhaust gas to thereby restrain the foreign particles from entering into the intake passage through the low pressure exhaust gas recirculation passage, wherein the foreign particles trapping device is disposed in the low pressure exhaust gas recirculation passage, the trapping device is positioned vertically lower, with respect to a direction of gravitational force, than a remainder of the low pressure exhaust gas recirculation passage, so that the foreign particles drop by gravitational force into the trapping device, the trapping device is a void that is free from filter media, the low pressure exhaust gas recirculation passage includes first and second passage segments, which extend in the direction of gravitational force, and the trapping device is arranged between the first and second passage segments and is connected to vertically lowermost portions of the first and second passage segments.