Patents by Inventor Mitchell Johnston

Mitchell Johnston 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).

  • Electrified vehicle flat towing system and control
    Patent number: 12370901
    Abstract: A flat towing technique for an electrified vehicle includes in response to a request for and during a flat towing operation, monitoring at least a back electromotive force (EMF) generated by an electric motor of the electrified powertrain, performing field weakening control of the electric motor such that the back EMF generated by the electric motor during the flat towing operation maintains a high voltage bus that powers the electric motor at a target voltage level, selectively isolating a high voltage battery system of the electrified powertrain from the high voltage bus based on a desired capacity of the high voltage battery system, and adjusting the target voltage level for the high voltage bus based on respective lower limits for electric motor speed and high voltage bus voltage and when the high voltage battery system is isolated from the high voltage bus.
    Type: Grant
    Filed: July 24, 2023
    Date of Patent: July 29, 2025
    Assignee: FCA US LLC
    Inventors: Benjamin M Abraham, Mitchell Johnston
  • ELECTRIFIED VEHICLE FLAT TOWING SYSTEM AND CONTROL
    Publication number: 20250033486
    Abstract: A flat towing technique for an electrified vehicle includes in response to a request for and during a flat towing operation, monitoring at least a back electromotive force (EMF) generated by an electric motor of the electrified powertrain, performing field weakening control of the electric motor such that the back EMF generated by the electric motor during the flat towing operation maintains a high voltage bus that powers the electric motor at a target voltage level, selectively isolating a high voltage battery system of the electrified powertrain from the high voltage bus based on a desired capacity of the high voltage battery system, and adjusting the target voltage level for the high voltage bus based on respective lower limits for electric motor speed and high voltage bus voltage and when the high voltage battery system is isolated from the high voltage bus.
    Type: Application
    Filed: July 24, 2023
    Publication date: January 30, 2025
    Inventors: Benjamin M. Abraham, Mitchell Johnston