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Turbocharged engine exhaust gas recirculation system

  • US 4,426,848 A
  • Filed: 11/20/1981
  • Issued: 01/24/1984
  • Est. Priority Date: 11/20/1981
  • Status: Expired due to Fees
First Claim
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1. An improved exhaust gas recirculation system for turbocharged gaseous fuel engines including an exhaust gas pipe, an exhaust driven turbocharger connected to the exhaust pipe, and a gaseous fuel supply connected to a carburetor for the engine, the improvement comprising:

  • exhaust conduit means connected to the exhaust pipe between the engine and turbocharger;

    first air conduit means connected to the turbocharger;

    venturi means connected with said exhaust and first air conduit means and with the engine carburetor;

    second air conduit means connecting said first air conduit means with the exhaust pipe for increasing the pressure in said exhaust pipe;

    first valve means located in said exhaust conduit means for controlling the flow of exhaust gas therethrough;

    second valve means located in said second air conduit for controlling the flow of air therethrough; and

    ,valve control means connected with both said valve means for opening said valve means when the engine is operating at more than idle speed or when loaded and permitting said valve means to close during starting and idling of the engine.

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