Patents by Inventor Nandagopal Methil-Sudhakaran

Nandagopal Methil-Sudhakaran 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).

  • Rail pressure control strategy for common rail fuel system
    Patent number: 9376977
    Abstract: A common rail fuel system includes a common rail supplied by an inlet metered high pressure pump and fluidly connected to a plurality of zero-leak fuel injectors. An electronic controller controls pressure in the common rail predominantly responsive to a rail pressure error when outside of an overshoot avoidance condition corresponding to the error being less than a first threshold and a time rate of change of the error being greater than a second threshold. Pressure in the common rail is controlled predominantly responsive to the time rate of change of the error during the overshoot avoidance condition.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: June 28, 2016
    Assignee: Caterpillar Inc.
    Inventors: Nandagopal Methil-Sudhakaran, Daniel R. Puckett, Frank Lombardi
  • Common rail system fault diagnostic using digital resonating filter
    Patent number: 9032788
    Abstract: A common rail fuel system diagnostic algorithm is executed by an engine control and real time to detect and identify a faulty fuel system component. Rail pressure data is processed through a digital resonating filter having a resonance frequency corresponding to a fault signature. A peak magnitude and phase of the output from the digital resonating filter reveals a degradation level of a fuel injector, and a phase of the output identifies which fuel injector is faulted.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: May 19, 2015
    Assignee: Caterpillar Inc.
    Inventors: Nandagopal Methil-Sudhakaran, Daniel Reese Puckett, Frank Lombardi
  • Rail Pressure Control Strategy For Common Rail Fuel System
    Publication number: 20140074382
    Abstract: A common rail fuel system includes a common rail supplied by an inlet metered high pressure pump and fluidly connected to a plurality of zero-leak fuel injectors. An electronic controller controls pressure in the common rail predominantly responsive to a rail pressure error when outside of an overshoot avoidance condition corresponding to the error being less than a first threshold and a time rate of change of the error being greater than a second threshold. Pressure in the common rail is controlled predominantly responsive to the time rate of change of the error during the overshoot avoidance condition.
    Type: Application
    Filed: September 7, 2012
    Publication date: March 13, 2014
    Applicant: CATERPILLAR INC.
    Inventors: Nandagopal Methil-Sudhakaran, Daniel R. Puckett, Frank Lombardi
  • Common Rail System Fault Diagnostic Using Digital Resonating Filter
    Publication number: 20130275026
    Abstract: A common rail fuel system diagnostic algorithm is executed by an engine control and real time to detect and identify a faulty fuel system component. Rail pressure data is processed through a digital resonating filter having a resonance frequency corresponding to a fault signature. A peak magnitude and phase of the output from the digital resonating filter reveals a degradation level of a fuel injector, and a phase of the output identifies which fuel injector is faulted.
    Type: Application
    Filed: April 13, 2012
    Publication date: October 17, 2013
    Applicant: Caterpillar Inc.
    Inventors: Nandagopal Methil-Sudhakaran, Daniel Reese Puckett, Frank Lombardi