Patents by Inventor Nagini Devarakonda

Nagini 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).

  • Method of estimating engine-out NOx mass flow rate
    Patent number: 9453450
    Abstract: A method of estimating a mass flow rate of nitrogen oxides in exhaust gas includes sensing a mass flow rate of a flow of exhaust gas from the engine. A nitrogen oxides base concentration for when the engine is operating at a reference state is defined, and a nitrogen oxides ratio for a current operating state of the internal combustion engine is calculated. The mass flow rate of the flow of exhaust gas, the nitrogen oxides base concentration, and the nitrogen oxides ratio for the current operating state of the engine are multiplied together to define an estimated value of the current mass flow rate of nitrogen oxides in the flow of exhaust gas from the engine. The estimated value of the mass flow rate of nitrogen oxides may be compared to the output from a nitrogen oxides sensor to determine proper functionality of the nitrogen oxides sensor.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: September 27, 2016
    Assignee: GM Global Technology Operations LLC
    Inventors: Min Sun, Igor Anilovich, Nagini Devarakonda, Pablo Hernandez Garcia
  • METHOD OF ESTIMATING ENGINE-OUT NOx MASS FLOW RATE
    Publication number: 20150354428
    Abstract: A method of estimating a mass flow rate of nitrogen oxides in exhaust gas includes sensing a mass flow rate of a flow of exhaust gas from the engine. A nitrogen oxides base concentration for when the engine is operating at a reference state is defined, and a nitrogen oxides ratio for a current operating state of the internal combustion engine is calculated. The mass flow rate of the flow of exhaust gas, the nitrogen oxides base concentration, and the nitrogen oxides ratio for the current operating state of the engine are multiplied together to define an estimated value of the current mass flow rate of nitrogen oxides in the flow of exhaust gas from the engine. The estimated value of the mass flow rate of nitrogen oxides may be compared to the output from a nitrogen oxides sensor to determine proper functionality of the nitrogen oxides sensor.
    Type: Application
    Filed: June 9, 2014
    Publication date: December 10, 2015
    Inventors: Min Sun, Igor Anilovich, Nagini Devarakonda, Pablo Hernandez Garcia