Patents Represented by Attorney, Agent or Law Firm Larry G. Gain
  • Patent number: 6185939
    Abstract: Past exhaust emission control systems fail to utilize exhaust gas recirculation during all operating parameters of an engine. The present exhaust gas recirculation system reduces the emissions emitted from an engine during all operating parameters of the engine. The engine includes a cylinder, a rotatable crankshaft and a turbocharger defining a compressor section compressing a flow of intake air to a first preestablished pressure and being driven by a flow of exhaust gas having a first preestablished pressure. The exhaust gas recirculation system is comprised of a portion of the flow of exhaust gas being recirculated to the cylinder and forming a flow of recirculated exhaust gas. The flow of recirculated exhaust gas is cooled. A portion of the flow of intake air is compressed to a second preestablished pressure. The flow of recirculated exhaust gas is compressed to a second preestablished pressure being at least as great as the first preestablished pressure of the intake air.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: February 13, 2001
    Assignee: Caterpillar Inc.
    Inventors: Gerald N. Coleman, Michael J. Evancik, Dennis D. Feucht, Keith E. Lawrence, Jiubo Ma