Patents by Inventor Maruthi Devarakonda

Maruthi Devarakonda 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).

  • Systems and methods for monitoring catalyst deactivation and controlling an air/fuel ratio
    Patent number: 9664094
    Abstract: A system for controlling an air/fuel ratio in an engine based on catalyst deactivation includes an NH3 detector disposed downstream from the three way catalyst, and a subsystem that compares measured values of NH3 concentration with a nominal value of NH3 concentration at rich operating conditions. A subsystem adjusts the air/fuel ratio based on the measured value of NH3 concentration and estimated CO concentration.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: May 30, 2017
    Assignee: General Electric Company
    Inventor: Maruthi Devarakonda
  • Systems and Methods for Monitoring Catalyst Deactivation and Controlling an Air/Fuel Ratio
    Publication number: 20150082773
    Abstract: A system for controlling an air/fuel ratio in an engine based on catalyst deactivation includes an NH3 detector disposed downstream from the three way catalyst, and a subsystem that compares measured values of NH3 concentration with a nominal value of NH3 concentration at rich operating conditions. A subsystem adjusts the air/fuel ratio based on the measured value of NH3 concentration and estimated CO concentration.
    Type: Application
    Filed: September 26, 2013
    Publication date: March 26, 2015
    Applicant: General Electric Company
    Inventor: Maruthi Devarakonda
  • NOx CONTROL SYSTEMS AND METHODS FOR CONTROLLING NOx EMISSIONS
    Publication number: 20120260634
    Abstract: An exhaust aftertreatment system comprising a selective reduction catalyst, a NOx sensor or an NH3 sensor, a urea injector, and a dosing control unit, wherein the dosing control unit calculates the rate of urea injection by estimating the concentrations of NO and NO2 in the exhaust downstream of the SCR catalyst.
    Type: Application
    Filed: June 29, 2012
    Publication date: October 18, 2012
    Applicant: MICHIGAN TECHNOLOGICAL UNIVERSITY
    Inventors: Maruthi Devarakonda, Gordon Parker, John Johnson
  • NOcontrol systems and methods for controlling NOemissions
    Patent number: 8230677
    Abstract: An exhaust aftertreatment system comprising a selective reduction catalyst, a NOx sensor or an NH3 sensor, a urea injector, and a dosing control unit, wherein the dosing control unit calculates the rate of urea injection by estimating the concentrations of NO and NO2 in the exhaust downstream of the SCR catalyst.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: July 31, 2012
    Assignee: Michigan Technological University
    Inventors: Maruthi Devarakonda, Gordon Parker, John Johnson
  • NOx CONTROL SYSTEMS AND METHODS FOR CONTROLLING NOx EMISSIONS
    Publication number: 20090133384
    Abstract: An exhaust aftertreatment system comprising a selective reduction catalyst, a NOx sensor or an NH3 sensor, a urea injector, and a dosing control unit, wherein the dosing control unit calculates the rate of urea injection by estimating the concentrations of NO and NO2 in the exhaust downstream of the SCR catalyst.
    Type: Application
    Filed: November 26, 2008
    Publication date: May 28, 2009
    Inventors: Maruthi Devarakonda, Gordon Parker, John Johnson