Patents by Inventor Prerit Pramod

Prerit Pramod 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).

  • Patent number: 10717463
    Abstract: According to one or more embodiments, an example system includes a motor, and a motor control system that includes a low side current measurement subsystem. The system further includes a processor that switches the motor control system to use feedforward current control in response to detecting a current measurement failure in the low side current measurement subsystem. The processor further identifies a first phase that has a failed current measurement. The processor also computes a current measurement for the first phase, which has the current measurement failure. The processor further uses the computed current measurement to compute a parameter estimate.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: July 21, 2020
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Prerit Pramod, Varsha Govindu, Zhe Zhang, Krishna Mohan Pavan Kumar Namburi
  • Publication number: 20200189399
    Abstract: A motor control system is configured to: determine a current supply limit for an electric motor; receive a current supply of the electric motor; identify one or more motor commands; adjust the one or more motor commands in response to a determination that the current supply is greater than the current supply limit; and selectively control the electric motor using the adjusted one or more motor commands.
    Type: Application
    Filed: November 1, 2019
    Publication date: June 18, 2020
    Inventors: Prerit Pramod, Jeffery A. Zuraski
  • Patent number: 10676129
    Abstract: According to one or more embodiments of the present invention a steer by wire steering system includes a deviation detection unit configured to determine a deviation signal that is indicative of a disturbance in one or more components coupled to a rack. The steer by wire steering system further includes a handwheel notification module configured to generate a modification signal based on the deviation signal, in response to the deviation signal being detected for at least a predetermined duration. The steer by wire steering system further includes a handwheel control module that generates an input command corresponding to a reference torque generated by a road wheel actuator, a feedback torque for a driver is generated based on the input command. The handwheel control module further modifies the input command using the modification signal, the modification providing a notification corresponding to the disturbance to the driver.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: June 9, 2020
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Tejas M. Varunjikar, Prerit Pramod, Julie A. Kleinau, Michael Eickholt, Rangarajan Ramanujam, Dennis B. Skellenger, Steven D. Klein
  • Patent number: 10676128
    Abstract: Technical solutions are described for inverter commutation techniques for five-phase synchronous motor drives. An example method for five-phase motor control of a five-phase motor in a steering system includes receiving, by a processing device, a commanded modulation index mi, a phase advance angle ?, and a measured position ?m. The method further includes generating, by the processing device, five duty cycles for each phase of the five-phase motor based at least in part on the commanded modulation index mi, the phase advance angle ?, and the measured position ?m. Each of the duty cycles includes a fundamental component and an injected harmonic component. The method further includes performing, by the processing device, a pulse width modulation technique on each of the five duty cycles to generate on-times for a plurality of switches in phase legs of an inverter.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: June 9, 2020
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Prerit Pramod, Zhe Zhang, A K M Arafat
  • Patent number: 10640143
    Abstract: Technical solutions are described for a motor control system to control a permanent magnet DC (PMDC) machine. An example motor control system includes one or more sensors for measuring an output current of the PMDC machine. The motor control system further includes a current regulator that generates a voltage command corresponding to an input current command for generating an amount of torque using the PMDC machine. The current regulator includes a current command compensator that generates a first voltage command based on the input current command received by the current regulator. The current regulator further includes a feedback compensator that generates a second voltage command based on the output current measured by the one or more sensors. The current regulator also includes an adder configured that generates the voltage command by adding the first voltage command and the second voltage command.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: May 5, 2020
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Prerit Pramod, Varsha Govindu, Rakesh Mitra, Nithil Babu Nalakath
  • Publication number: 20200130732
    Abstract: According to one or more embodiments, an example system includes a motor, and a motor control system that includes a low side current measurement subsystem. The system further includes a processor that switches the motor control system to use feedforward current control in response to detecting a current measurement failure in the low side current measurement subsystem. The processor further identifies a first phase that has a failed current measurement. The processor also computes a current measurement for the first phase, which has the current measurement failure. The processor further uses the computed current measurement to compute a parameter estimate.
    Type: Application
    Filed: October 31, 2018
    Publication date: April 30, 2020
    Inventors: Prerit Pramod, Varsha Govindu, Zhe Zhang, Krishna Mohan Pavan Kumar Namburi
  • Publication number: 20200114949
    Abstract: Technical solutions are described for attenuating dither noise in a steering system. An example method includes computing a torque command based on an input torque, and generating a current command corresponding to the torque command. Further, the method includes determining an adjustment parameter based on a plurality of steering system signals. Further, the method includes reducing dither noise of the steering system by dynamically modifying a controller parameter value using the adjustment parameter. Further, the method includes generating a voltage command using the current command and the modified controller parameter value, the voltage command used to generate torque by a motor.
    Type: Application
    Filed: October 11, 2018
    Publication date: April 16, 2020
    Inventors: Michael Eickholt, Prerit Pramod
  • Publication number: 20200114950
    Abstract: A system includes a first module that: receives the output current from the electric motor as a feedback, the output current including a direct axis component and a quadrature axis component; and generates a first voltage command based on a virtual resistance value, the feedback, and a targeted frequency characteristic of the motor control system. The system includes: a second module that: receives a difference between the feedback and a commanded current; and generates a second voltage command based on an estimated inductance value, an estimated resistance value of an electric motor, the virtual resistance value, a targeted frequency response characteristic of the motor control system, and the response of the d-axis component of the output current being decoupled from the response of the q-axis component. The system includes an addition module that generates an input voltage command for the electric motor by adding the first and second voltage commands.
    Type: Application
    Filed: October 15, 2018
    Publication date: April 16, 2020
    Inventors: Prerit Pramod, Julie A. Kleinau
  • Patent number: 10618547
    Abstract: Technical solutions are described for a control system that includes a current command module configured to receive a torque command and output a current command for controlling a direct current (DC) motor, and a regenerative current limiting module configured to receive a regenerative current limit as an input and actively compute a motor current limit based on the regenerative current limit, the regenerative current limiting module configured to limit the current command based on the motor current limit.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: April 14, 2020
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Prerit Pramod, Krishna MPK Namburi
  • Publication number: 20200112280
    Abstract: According to one or more embodiments of the technical solutions described herein, an example method includes determining an input voltage (Vinv) of an inverter in a power circuit. The method further includes measuring an input current (Ii) of the inverter. The method further includes estimating a power supply current from a power supply of the power circuit based on the input voltage and the input current using a state observer and a plant model of the power circuit, the power supply current estimated at a non-steady state. The method further includes performing an active power management of a motor that receives electric power via the inverter.
    Type: Application
    Filed: October 5, 2018
    Publication date: April 9, 2020
    Inventors: Prerit Pramod, Aparna Saha, Infane O. Lowe
  • Publication number: 20200108856
    Abstract: Technical solutions are described for inverter commutation techniques for five-phase synchronous motor drives. An example method for five-phase motor control of a five-phase motor in a steering system includes receiving, by a processing device, a commanded modulation index mi, a phase advance angle ?, and a measured position ?m. The method further includes generating, by the processing device, five duty cycles for each phase of the five-phase motor based at least in part on the commanded modulation index mi, the phase advance angle ?, and the measured position ?m. Each of the duty cycles includes a fundamental component and an injected harmonic component. The method further includes performing, by the processing device, a pulse width modulation technique on each of the five duty cycles to generate on-times for a plurality of switches in phase legs of an inverter.
    Type: Application
    Filed: October 5, 2018
    Publication date: April 9, 2020
    Inventors: Prerit Pramod, Zhe Zhang, AKM Arafat
  • Publication number: 20200083826
    Abstract: Technical solutions are described for generating an output torque from a multi-winding PMDC motor. An example method includes generating, by a current controller, a first voltage command for a first winding set from a plurality of winding sets of the PMDC motor, the first winding set generates a first current in response to the first voltage command. The method further includes generating, by the current controller, a second voltage command for the second winding set from the winding sets of the PMDC motor, the second winding set generates a second current in response to the second voltage command. The method further includes generating, by the PMDC motor, the output torque based on the first current and the second current.
    Type: Application
    Filed: September 7, 2018
    Publication date: March 12, 2020
    Inventors: Julius M. Woo, Prerit Pramod, Mohammed R. Islam
  • Publication number: 20200059085
    Abstract: Improvements to a power input circuit of an electric motor drive system are provided. The power input circuit is provided between a power source (e.g., battery), and a load (e.g., an inverter and a motor in the electric motor drive system). The power input circuit can comprise controllable switches for reverse polarity protection and isolation of the inverter under supply short circuit condition. In addition, an improvement to a power input circuit can comprise connection of a power supply (e.g., voltage regulator) to the external power source input side of a reverse polarity protection circuit in the power input circuit to mitigate against microcontroller restart from post-failure shutdown condition. Connection of a low-power diode in series with the voltage regulator also provides for reverse polarity protection.
    Type: Application
    Filed: August 13, 2019
    Publication date: February 20, 2020
    Inventors: Nithin Kolli, Prerit Pramod, Aparna Saha
  • Publication number: 20200017139
    Abstract: According to one or more embodiments of the technical solutions described herein, a method for generating torque in a steering system includes computing, by a controller, a lateral velocity of a vehicle using a vehicle model that uses a vehicle velocity, a surface friction estimate, a tire-angle, and at least one of a measured yaw rate from a yaw rate sensor and a lateral acceleration. The method further includes generating, by the controller, a torque command for providing assist torque to a driver, the torque command is based on the lateral velocity that is computed. The method further includes providing, by a motor, the assist torque, which is an amount of torque corresponding to the torque command.
    Type: Application
    Filed: July 12, 2018
    Publication date: January 16, 2020
    Inventors: Rangarajan Ramanujam, Bhuvanesh Sainath, Tejas M. Varunjikar, Prerit Pramod
  • Patent number: 10526008
    Abstract: Technical solutions are described for applying machine current limiting in permanent magnet synchronous motors. An example system includes a PMSM and a motor control system. The motor control system is configured to receive a torque command and determine whether the torque command can be satisfied based on a given voltage and a given maximum motor current limit. The motor control system is further configured to, responsive to determining that the torque command can be satisfied, determine a minimum current that satisfies the torque command. The motor control system is further configured to send the minimum current as a minimum current command to the PMSM.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: January 7, 2020
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Haibo Li, Prerit Pramod
  • Patent number: 10530282
    Abstract: An embodiment of a control system includes a current command module configured to receive a torque command and output a current command for controlling a direct current (DC) motor, and a current capability limiting module configured to receive the current command and a current limit indicating a maximum motor current, limit the current command based on the current limit, and actively further limit the current command based on a capability limit value.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: January 7, 2020
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Prerit Pramod, Krishna Mohan Pavan Namburi, Julie Ann Kleinau
  • Publication number: 20190389505
    Abstract: Technical solutions are described for a motor control system to control a permanent magnet DC (PMDC) machine. An example motor control system includes one or more sensors for measuring an output current of the PMDC machine. The motor control system further includes a current regulator that generates a voltage command corresponding to an input current command for generating an amount of torque using the PMDC machine. The current regulator includes a current command compensator that generates a first voltage command based on the input current command received by the current regulator. The current regulator further includes a feedback compensator that generates a second voltage command based on the output current measured by the one or more sensors. The current regulator also includes an adder configured that generates the voltage command by adding the first voltage command and the second voltage command.
    Type: Application
    Filed: June 20, 2018
    Publication date: December 26, 2019
    Inventors: Prerit Pramod, Varsha Govindu, Rakesh Mitra, Nithil Babu Nalakath
  • Publication number: 20190393818
    Abstract: Technical solutions are described for estimating machine parameters of a permanent magnet synchronous motor (PMSM) drive. An example method includes determining a region for estimating a machine parameter based on a motor velocity value and a motor current value. The method further includes, in response to the motor velocity value and the motor current value being in the region, estimating an error in estimated voltage command, and estimating the machine parameter using the error in estimated voltage command.
    Type: Application
    Filed: June 20, 2018
    Publication date: December 26, 2019
    Inventors: Nicholas E. Gizinski, Prerit Pramod, Julie A. Kleinau
  • Publication number: 20190389508
    Abstract: According to one or more embodiments of the present invention a steer by wire steering system includes a deviation detection unit configured to determine a deviation signal that is indicative of a disturbance in one or more components coupled to a rack. The steer by wire steering system further includes a handwheel notification module configured to generate a modification signal based on the deviation signal, in response to the deviation signal being detected for at least a predetermined duration. The steer by wire steering system further includes a handwheel control module that generates an input command corresponding to a reference torque generated by a road wheel actuator, a feedback torque for a driver is generated based on the input command. The handwheel control module further modifies the input command using the modification signal, the modification providing a notification corresponding to the disturbance to the driver.
    Type: Application
    Filed: June 25, 2018
    Publication date: December 26, 2019
    Inventors: Tejas M. Varunjikar, Prerit Pramod, Julie A. Kleinau, Michael Eickholt, Rangarajan Ramanujam, Dennis B. Skellenger, Steven D. Klein
  • Publication number: 20190351939
    Abstract: One or more embodiments are described for preventing controller windup in a motion control system. An example system includes a regulator that receives an input command to adjust a motion control variable of a mechanical system that includes a motor, the regulator configured to generate a first torque command based on the input command and an output torque from the motor. The system further includes a motor control module that receives the first torque command to generate an input torque command that is sent to the motor. The system further includes an anti-windup module that is configured to generate an anti-windup command based on the first torque command and the output torque, the anti-windup command being added to the input command that is sent to the regulator.
    Type: Application
    Filed: May 17, 2018
    Publication date: November 21, 2019
    Inventors: Prerit Pramod, Zhe Zhang, Rakesh Mitra, Rangarajan Ramanujam