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Method of operating an internal combustion engine

  • US 6,029,451 A
  • Filed: 08/07/1998
  • Issued: 02/29/2000
  • Est. Priority Date: 08/08/1997
  • Status: Expired due to Term
First Claim
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1. An internal combustion engine including a turbocharger with a compressor and an exhaust gas turbine with a controllable gas admission flow guide structure, an air intake duct connected to said compressor for supplying combustion air to said engine, an exhaust pipe for discharging exhaust gas from said engine to said turbine, an exhaust gas recirculation pipe extending between said exhaust pipe and said air intake duct for recirculating exhaust gas from said exhaust pipe to said air intake duct, an exhaust gas recirculation valve arranged in said exhaust gas recirculation pipe for controlling the exhaust gas flow from said exhaust pipe to said air intake duct, an oxygen sensor arranged in said air intake duct downstream of the jointure of said exhaust gas recirculation pipe with said air intake duct, another oxygen sensor arranged in said exhaust pipe for sensing the oxygen content in said exhaust gas and a control unit to which said oxygen sensors are connected and which is connected to said exhaust gas recirculation valve and said turbine inlet flow guide structure for controlling said exhaust gas recirculation valve and said flow guide structure depending on the recirculation flow rate calculated from the sensor values provided by said oxygen sensors.

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