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Cooled exhaust gas recirculation system with load and ambient bypasses

  • US 5,617,726 A
  • Filed: 03/31/1995
  • Issued: 04/08/1997
  • Est. Priority Date: 03/31/1995
  • Status: Expired due to Term
First Claim
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1. An exhaust gas recirculation system for an internal combustion engine by which a portion of exhaust gases produced by the engine are recirculated from an exhaust line of the engine into an intake line of the engine, said exhaust gas recirculation system comprising an exhaust gas recirculation line connecting the exhaust line of the engine to the intake line of the engine, cooler means for cooling the recirculated portion of the exhaust gases, a bypass line extending from said recirculation line in bypassing relationship to said cooler means, and valve means for directing the recirculated portion of the exhaust gases to said intake line via said bypass line under low engine temperature operating conditions and under low engine load operating conditions, and via said cooler means under other engine operating conditions;

  • wherein an engine driven supercharger is disposed in the intake line; and

    wherein the recirculated portion of the exhaust gases is introduced into the intake line by induction.

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