×

System for controlling recirculated exhaust gas temperature in an internal combustion engine

  • US 5,732,688 A
  • Filed: 12/11/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 12/11/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for controlling the temperature of recirculated exhaust gas in an internal combustion engine, comprising:

  • a first conduit coupled at one end to an exhaust gas port of the engine;

    a second conduit coupled at one end to an air inlet port of the engine;

    a source of coolant fluid;

    a heat exchanger including a housing defining a gas inlet port, a gas outlet port, a coolant inlet port and a coolant outlet port, said gas inlet port connected to an opposite end of said first conduit and receiving exhaust gas therefrom, said gas outlet port connected to an opposite end of said second conduit and supplying recirculated exhaust gas thereto, said coolant inlet port connected to said source of coolant fluid, said heat exchanger defining a coolant flow path therethrough from said source of coolant fluid to said coolant outlet port;

    a coolant control valve disposed within said coolant flow path and operable to control a rate of coolant flow therethrough;

    a temperature sensor operable to sense heat exchanger housing temperature and produce a temperature signal corresponding thereto; and

    an electronic control system responsive to said temperature signal to provide a coolant valve control signal corresponding thereto, said coolant control valve responsive to said coolant valve control signal to control said rate of coolant flow through said coolant flow path and thereby control said recirculated exhaust gas temperature.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×