Patents by Inventor Karthik Giritharan

Karthik Giritharan 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 and apparatus for detection of LVDT core fallout condition
    Patent number: 8712710
    Abstract: A method includes measuring a first voltage (VA) across a first sensing coil of a linear variable differential transformer (LVDT) and measuring a second voltage (VB) across a second sensing coil of the LVDT. The method also includes signaling a core fallout condition in response to (i) determining that a ratio of VA and VB is within a specified range of a value of one and (ii) determining that a sum of VA and VB is less than a sum of VA0 and VB0 by more than a specified amount. VA0 and VB0 are minimum voltages across the first and second sensing coils of the LVDT, respectively, when a core of the LVDT is in the LVDT.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: April 29, 2014
    Assignee: Honeywell International Inc.
    Inventors: Rakesh Damodaran Nair, Arulvel Sellamuthu, Nagaraja Sundaresh, Manjunatha Kotreshi Alabur, Amol Kinage, Karthik Giritharan, Ananda Huchappa Shastry
  • System and method for testing a secondary servo control circuit in a redundant control configuration
    Patent number: 8587320
    Abstract: A system, apparatus and method are provided for testing a secondary servo control circuit in a redundant control configuration. A first circuit is configured to receive a control signal and to control an attribute of an actuator based on the control signal using a first control input of the actuator. A second circuit is configured to test operation of an actuator circuit using a test signal. The actuator circuit includes at least part of the second circuit and a second control input of the actuator. The test signal is selected to avoid causing independent motion of the actuator. The actuator could be a dual coil servo valve, and the test signal could be a current (such as a DC current, an AC current, or a pulsed current) having a magnitude less than a bias current of the actuator.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: November 19, 2013
    Assignee: Honeywell International Inc.
    Inventors: Dinesh Kumar Kn, Nagaraja Sundaresh, Karthik Giritharan, Srinivasan Rajagopal, Amol Kinage, Rakesh Damodaran Nair, Sai Krishnan Jagannathan, Sunil M. Ingawale, Sachin Kumar
  • METHOD AND APPARATUS FOR DETECTION OF LVDT CORE FALLOUT CONDITION
    Publication number: 20120290238
    Abstract: A method includes measuring a first voltage (VA) across a first sensing coil of a linear variable differential transformer (LVDT) and measuring a second voltage (VB) across a second sensing coil of the LVDT. The method also includes signaling a core fallout condition in response to (i) determining that a ratio of VA and VB is within a specified range of a value of one and (ii) determining that a sum of VA and VB is less than a sum of VA0 and VB0 by more than a specified amount. VA0 and VB0 are minimum voltages across the first and second sensing coils of the LVDT, respectively, when a core of the LVDT is in the LVDT.
    Type: Application
    Filed: May 13, 2011
    Publication date: November 15, 2012
    Applicant: Honeywell International Inc.
    Inventors: Rakesh Damodaran Nair, Arulvel Sellamuthu, Nagaraja Sundaresh, Manjunatha Kotreshi Alabur, Amol Kinage, Karthik Giritharan, Ananda Huchappa Shastry
  • SYSTEM AND METHOD FOR TESTING A SECONDARY SERVO CONTROL CIRCUIT IN A REDUNDANT CONTROL CONFIGURATION
    Publication number: 20120112759
    Abstract: A system, apparatus and method are provided for testing a secondary servo control circuit in a redundant control configuration. A first circuit is configured to receive a control signal and to control an attribute of an actuator based on the control signal using a first control input of the actuator. A second circuit is configured to test operation of an actuator circuit using a test signal. The actuator circuit includes at least part of the second circuit and a second control input of the actuator. The test signal is selected to avoid causing independent motion of the actuator. The actuator could be a dual coil servo valve, and the test signal could be a current (such as a DC current, an AC current, or a pulsed current) having a magnitude less than a bias current of the actuator.
    Type: Application
    Filed: November 9, 2010
    Publication date: May 10, 2012
    Applicant: Honeywell International Inc.
    Inventors: Dinesh Kumar KN, Nagaraja Sundaresh, Karthik Giritharan, Srinivasan Rajagopal, Amol Kinage, Rakesh Damodaran Nair, Sai Krishnan Jagannathan, Sunil M. Ingawale, Sachin Kumar