Patents by Inventor Andrew C. Matheaus

Andrew C. Matheaus has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hybrid technology for lean NOx trap and particulate filter regeneration control
    Patent number: 7621120
    Abstract: A method for the use of hybrid technology to control lean NOx trap (LNT) and particulate filter regenerations using an electric motor wherein for the LNT (a) the electric motor is adapted to absorb torque excursions of the engine during regeneration of the LNT, (b) wherein the electric motor is adapted to add torque to thereby reduce the air required in the engine and to thereby reduce the amount of fuel needed to regenerate the LNT, or (c) both (a) and (b), or wherein for the particulate filter the electric motor is (a) adapted to load the engine to thereby increase the exhaust temperature to thereby facilitate regeneration of the particulate filter, (b) adapted to use a power source for the electric motor to power an electrically powered particulate filter regeneration unit to thereby facilitate regeneration of the particulate filter, or (c) both (a) and (b).
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: November 24, 2009
    Assignee: Southwest Research Institute
    Inventors: Andrew C. Matheaus, Ryan C. Roecker, Charles E. Roberts, Jr.
  • Use of a variable valve actuation system to control the exhaust gas temperature and space velocity of aftertreatment system feedgas
    Patent number: 6948310
    Abstract: A method for controlling the temperature and/or space velocity of exhaust gas passing through an aftertreatment device disposed in the exhaust system of a diesel engine provides an optimal environment for efficient conversion of NOx and undesirable emissions during transient and steady state engine operation. The method includes controlling intake and/or exhaust valve timing, either singly or in combination with fuel injection timing and selective individual cylinder cutout, in response to sensed engine operating parameters.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: September 27, 2005
    Inventors: Charles E. Roberts, Jr., Andrew C. Matheaus, David P. Branyon, Rudolf H Stanglmaier, Lee G. Dodge, Thomas W. Ryan, III, Daniel W. Stewart
  • Use of a variable valve actuation system to control the exhaust gas temperature and space velocity of aftertreatment system feedgas
    Publication number: 20040060284
    Abstract: A method for controlling the temperature and/or space velocity of exhaust gas passing through an aftertreatment device disposed in the exhaust system of a diesel engine provides an optimal environment for efficient conversion of NOx and undesirable emissions during transient and steady state engine operation. The method includes controlling intake and/or exhaust valve timing, either singly or in combination with fuel injection timing and selective individual cylinder cutout, in response to sensed engine operating parameters.
    Type: Application
    Filed: October 1, 2002
    Publication date: April 1, 2004
    Inventors: Charles E. Roberts, Andrew C. Matheaus, David P. Branyon, Rudolf H. Stanglmaier, Lee G. Dodge, Thomas W. Ryan, Daniel W. Stewart