Patents by Inventor Sridhar Kalivarapu

Sridhar Kalivarapu 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 for detecting heater core isolation valve status
    Patent number: 11413951
    Abstract: Methods and systems are provided for a vehicle coolant circuit. In one example, the coolant circuit includes a heater core isolation valve (HCIV) where a status of the HCIV may be diagnosed by intrusively activating a positive temperature coefficient heater in a cooling loop in which the HCIV is arranged. A response of coolant temperature to heater activation may be used to determine a position of the HCIV.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: August 16, 2022
    Assignee: Ford Global Technologies, LLC
    Inventors: Sridhar Kalivarapu, Robert Roy Jentz, Athira Vilson, Herbert Thomas Meissner, Sitaram Rejeti
  • Method for detecting heater core isolation valve status
    Patent number: 11401882
    Abstract: Methods and systems are provided for monitoring a status of a heater core isolation valve (HCIV) housing in an engine coolant circuit including a first coolant loop and a second coolant loop. In one example, a method may include indicating degradation of the HCIV based on a difference between a first coolant loop temperature and a second coolant loop temperature upon activation of coolant system pumps and deactivation of a positive temperature coefficient (PTC) heater housed in the cabin heating loop.
    Type: Grant
    Filed: August 8, 2019
    Date of Patent: August 2, 2022
    Assignee: Ford Global Technologies, LLC
    Inventors: Sitaram Rejeti, Robert Roy Jentz, Sridhar Kalivarapu
  • METHOD FOR DETECTING HEATER CORE ISOLATION VALVE STATUS
    Publication number: 20210040911
    Abstract: Methods and systems are provided for monitoring a status of a heater core isolation valve (HCIV) housing in an engine coolant circuit including a first coolant loop and a second coolant loop. In one example, a method may include indicating degradation of the HCIV based on a difference between a first coolant loop temperature and a second coolant loop temperature upon activation of coolant system pumps and deactivation of a positive temperature coefficient (PTC) heater housed in the cabin heating loop.
    Type: Application
    Filed: August 8, 2019
    Publication date: February 11, 2021
    Inventors: Sitaram Rejeti, Robert Roy Jentz, Sridhar Kalivarapu
  • METHOD FOR DETECTING HEATER CORE ISOLATION VALVE STATUS
    Publication number: 20200384845
    Abstract: Methods and systems are provided for a vehicle coolant circuit. In one example, the coolant circuit includes a heater core isolation valve (HCIV) where a status of the HCIV may be diagnosed by intrusively activating a positive temperature coefficient heater in a cooling loop in which the HCIV is arranged. A response of coolant temperature to heater activation may be used to determine a position of the HCIV.
    Type: Application
    Filed: June 5, 2019
    Publication date: December 10, 2020
    Inventors: Sridhar Kalivarapu, Robert Roy Jentz, Athira Vilson, Herbert Thomas Meissner, Sitaram Rejeti