Patents by Inventor Mark T. Riefe

Mark T. Riefe 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: 10697512
    Abstract: A shield assembly is employed for a friction brake used to decelerate a road wheel of a vehicle. The vehicle has a body with a first body end configured to face an incident ambient airflow, a second body end opposite of the first body end, and an underbody section spanning a distance between the first and second ends. The shield assembly includes a first shield component arranged proximate the brake and rotationally fixed relative to the vehicle body. The shield assembly also includes a second shield component operatively connected to the first shield component for shifting relative thereto. The shield assembly additionally includes an actuator employing a shape memory alloy element to shift the second shield component relative to the first shield component in response to a temperature of the brake to thereby direct at least a portion of the airflow to the brake and control temperature thereof.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: June 30, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Richard J. Skurkis, Paul W. Alexander, Anthony L. Smith, David Begleiter, Mark T. Riefe, Steven J. Weber
  • Publication number: 20200191219
    Abstract: A shield assembly is employed for a friction brake used to decelerate a road wheel of a vehicle. The vehicle has a body with a first body end configured to face an incident ambient airflow, a second body end opposite of the first body end, and an underbody section spanning a distance between the first and second ends. The shield assembly includes a first shield component arranged proximate the brake and rotationally fixed relative to the vehicle body. The shield assembly also includes a second shield component operatively connected to the first shield component for shifting relative thereto. The shield assembly additionally includes an actuator employing a shape memory alloy element to shift the second shield component relative to the first shield component in response to a temperature of the brake to thereby direct at least a portion of the airflow to the brake and control temperature thereof.
    Type: Application
    Filed: February 26, 2020
    Publication date: June 18, 2020
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Richard J. Skurkis, Paul W. Alexander, Anthony L. Smith, David Begleiter, Mark T. Riefe, Steven J. Weber
  • Publication number: 20200102993
    Abstract: An exemplary method for determining a remaining life expectancy of a brake component includes the steps of providing vehicle parameters that identify operating conditions of a vehicle, using the vehicle parameters to determine work done by a brake of the vehicle as brake work, using the brake work to determine brake rotor temperature, using the brake rotor temperature to determine a fatigue damage of the brake component, accumulating the fatigue damage to determine a cumulative fatigue damage of the brake component, and comparing the cumulative fatigue damage to a damage limit to provide an estimation of the remaining life expectancy of the brake component.
    Type: Application
    Filed: September 28, 2018
    Publication date: April 2, 2020
    Inventors: David B. Antanaitis, Mark T. Riefe
  • Publication number: 20200072305
    Abstract: A method for manufacturing a ferrous rotational member including the steps of turning a first portion of the friction surface at a sufficient feed rate to provide a first deformed layer on the first portion of the friction surface; fine turning a second portion of the friction surface at a sufficient feed rate to provide a second deformed layer on the second portion of the friction surface; burnishing the first and second portions of the friction surface to achieve a predetermined roughness; and nitrocarburizing the rotational member at a time and temperature sufficient for the diffusion of nitrogen atoms and carbon atoms through the deformed layer to form hardened casings having variable thickness. The ferrous rotational member may be that of a brake rotor having a hub surface and a friction surface, where the hub surface and friction surface have a variable thickness hardened casing.
    Type: Application
    Filed: July 11, 2019
    Publication date: March 5, 2020
    Inventors: Henry Zhan, Jianfeng Wang, Michael L. Holly, Mark T. Riefe
  • Patent number: 10562509
    Abstract: A brake temperature monitoring system configured to monitor at least one of a rotor and hydraulic fluid of a brake mechanism for a vehicle. The system including a controller including a processor and an electronic storage medium, a vehicle velocity sensor, an ambient temperature sensor, and a pre-programmed module. The vehicle velocity sensor is configured to output a velocity signal to the processor. The ambient temperature sensor is configured to output an ambient temperature signal to the processor. The model is pre-programmed into the electronic storage medium, and is adapted to estimate the temperature of at least one of the rotor and the hydraulic fluid. The estimation is based on an ambient air temperature, and a pre-established relationship between a conductive heat transfer factor and a convective heat transfer factor. The convective heat transfer factor is a function of vehicle velocity.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: February 18, 2020
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David B. Antanaitis, Mark T. Riefe, Chih-hung Yen
  • Patent number: 10495169
    Abstract: Technical solutions are described to for determining thickness of a vehicle brake rotor. An example method includes providing vehicle parameters that identify operating conditions of a vehicle, and using the vehicle parameters to determine work done by a brake of the vehicle as brake-work. Further, the method includes using the brake work to determine brake rotor temperature, and using the brake rotor temperature to determine brake rotor wear. The method further includes accumulating the brake rotor wear to provide an estimation of the thickness of the vehicle brake rotor.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: December 3, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David B. Antanaitis, Mark T. Riefe, Matthew A. Robere
  • Publication number: 20190360543
    Abstract: A shield assembly is employed for a friction brake used to decelerate a road wheel of a vehicle. The vehicle has a body with a first body end configured to face an incident ambient airflow, a second body end opposite of the first body end, and an underbody section spanning a distance between the first and second ends. The shield assembly includes a first shield component arranged proximate the brake and rotationally fixed relative to the vehicle body. The shield assembly also includes a second shield component operatively connected to the first shield component for shifting relative thereto. The shield assembly additionally includes an actuator employing a shape memory alloy element to shift the second shield component relative to the first shield component in response to a temperature of the brake to thereby direct at least a portion of the airflow to the brake and control temperature thereof.
    Type: Application
    Filed: May 23, 2018
    Publication date: November 28, 2019
    Applicant: GM Global Technology Operations LLC
    Inventors: Richard J. Skurkis, Paul W. Alexander, Anthony L. Smith, David Begleiter, Mark T. Riefe, Steven J. Weber
  • Patent number: 10486674
    Abstract: A system for determining thickness of a brake pad includes a controller configured to provide a total braking energy of a vehicle with a regenerative energy braking system, and a rotor braking system that includes a plurality of brake pads. The system controller determines the work done by the brake pads as a combination of front brake pad work and rear brake pad work, then accumulates the brake pad wear to provide an estimation of the brake pad thickness using the front brake pad work and the rear brake pad work.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: November 26, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Matthew A. Robere, Mark T. Riefe, David B. Antanaitis
  • Patent number: 10378599
    Abstract: A brake rotor comprising a brake pad wear surface; a hat surface; and a decorative insert comprising an insert material, the decorative insert disposed on the brake pad wear surface, the hat surface, or both; wherein at least one of a friction coefficient between the decorative insert and a brake pad is substantially the same as a friction coefficient between the brake pad wear surface and the brake pad, a wear rate of the decorative insert is substantially the same as or greater than a wear rate of the brake pad wear surface, or a wear rate of the decorative insert is substantially the same as or greater than a wear rate of the hat surface; and at least a portion of the decorative insert is visible on the brake pad wear surface, the hat surface, or both.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: August 13, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Christopher J. Mettrick, Mark T. Riefe, Michael L. Holly, James A. Webster, Michael J. Walker, Anil K. Sachdev
  • Publication number: 20190152460
    Abstract: An electromechanical brake system includes a caliper, an electric motor mounted to the caliper, a gear element mechanically connected to the electric motor, an actuator supported by the caliper, the actuator including an actuation member, and a controller operatively connected to the actuator. The controller is operable to selectively engage the actuation member with the gear element to positionally lock the first caliper member relative to the second caliper member.
    Type: Application
    Filed: November 22, 2017
    Publication date: May 23, 2019
    Inventors: David B. Antanaitis, Mark T. Riefe, Kevin D. Connor
  • Publication number: 20190071062
    Abstract: A system for determining thickness of a brake pad includes a controller configured to provide a total braking energy of a vehicle with a regenerative energy braking system, and a rotor braking system that includes a plurality of brake pads. The system controller determines the work done by the brake pads as a combination of front brake pad work and rear brake pad work, then accumulates the brake pad wear to provide an estimation of the brake pad thickness using the front brake pad work and the rear brake pad work.
    Type: Application
    Filed: September 1, 2017
    Publication date: March 7, 2019
    Inventors: Matthew A. Robere, Mark T. Riefe, David B. Antanaitis
  • Publication number: 20190017561
    Abstract: Technical solutions are described to for determining thickness of a vehicle brake rotor. An example method includes providing vehicle parameters that identify operating conditions of a vehicle, and using the vehicle parameters to determine work done by a brake of the vehicle as brake-work. Further, the method includes using the brake work to determine brake rotor temperature, and using the brake rotor temperature to determine brake rotor wear. The method further includes accumulating the brake rotor wear to provide an estimation of the thickness of the vehicle brake rotor.
    Type: Application
    Filed: July 17, 2017
    Publication date: January 17, 2019
    Inventors: David B. Antanaitis, Mark T. Riefe, Matthew A. Robere
  • Publication number: 20190017161
    Abstract: A number of variations may include a ferritically nitrocarburized vehicle component comprising a compound zone and a friction surface at an outer edge of the compound zone wherein the friction surface is configured for engagement with a corresponding friction material, and wherein the compound zone comprises a nitride layer comprising epsilion iron nitride, Fe3N and gamma prime iron nitride Fe4N.
    Type: Application
    Filed: July 14, 2017
    Publication date: January 17, 2019
    Inventors: Michael L. Holly, Mark T. Riefe, Matthew A. Robere
  • Publication number: 20190009769
    Abstract: A brake temperature monitoring system configured to monitor at least one of a rotor and hydraulic fluid of a brake mechanism for a vehicle. The system including a controller including a processor and an electronic storage medium, a vehicle velocity sensor, an ambient temperature sensor, and a pre-programmed module. The vehicle velocity sensor is configured to output a velocity signal to the processor. The ambient temperature sensor is configured to output an ambient temperature signal to the processor. The model is pre-programmed into the electronic storage medium, and is adapted to estimate the temperature of at least one of the rotor and the hydraulic fluid. The estimation is based on an ambient air temperature, and a pre-established relationship between a conductive heat transfer factor and a convective heat transfer factor. The convective heat transfer factor is a function of vehicle velocity.
    Type: Application
    Filed: July 6, 2017
    Publication date: January 10, 2019
    Inventors: David B. Antanaitis, Mark T. Riefe, Chih-hung Yen
  • Publication number: 20190011004
    Abstract: A brake rotor comprising a brake pad wear surface; a hat surface; and a decorative insert comprising an insert material, the decorative insert disposed on the brake pad wear surface, the hat surface, or both; wherein at least one of a friction coefficient between the decorative insert and a brake pad is substantially the same as a friction coefficient between the brake pad wear surface and the brake pad, a wear rate of the decorative insert is substantially the same as or greater than a wear rate of the brake pad wear surface, or a wear rate of the decorative insert is substantially the same as or greater than a wear rate of the hat surface; and at least a portion of the decorative insert is visible on the brake pad wear surface, the hat surface, or both.
    Type: Application
    Filed: July 6, 2017
    Publication date: January 10, 2019
    Inventors: Christopher J. Mettrick, Mark T. Riefe, Michael L. Holly, James A. Webster, Michael J. Walker, Anil K. Sachdev
  • Publication number: 20170307036
    Abstract: Brake system telemetry systems and methods utilize wireless communication technology to communicate brake system data to one or more vehicle electronic control modules. A wireless transceiver is provided and is operably disposed with the brake system components. The wireless transceiver is coupled to receive data from various components of the brake system at the respective and to communicate the data to one or more electronic control units within the vehicle.
    Type: Application
    Filed: April 20, 2016
    Publication date: October 26, 2017
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: ANDREW M. NUESSER, JAMES A. WEBSTER, STEVEN J. WEBER, MARK T. RIEFE, BRIAN S. PAPROCKI, MICHAEL J. SHENBERGER
  • Publication number: 20170058982
    Abstract: A number of variations may include a product that may include at least one working friction surface that may include at least two layers that may include a compound layer and a nitrogen diffusion layer wherein the compound layer may have a porosity ranging from about 19% to about 50%.
    Type: Application
    Filed: August 26, 2015
    Publication date: March 2, 2017
    Inventors: MICHAEL L. HOLLY, MARK T. RIEFE, RICHARD A. KAATZ, CARA L. LEARMAN, DAVID B. ANTANAITIS, LISA G. DEVOE
  • Patent number: 9581211
    Abstract: One variation includes a friction material and method of manufacture thereof wherein the friction material includes a transfer layer on a ferritically nitrocarburized component, wherein the transfer layer may be fabricated from glass, rubber, carbon, aramid fiber, filler material, abrasive, or a high-temperature resin.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: February 28, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Michael L. Holly, David B. Antanaitis, Richard A. Kaatz, Mark T. Riefe, Cara L. Learman
  • Patent number: 9527132
    Abstract: One embodiment of the invention may include a product including a body portion including a first face and a frictional damping insert overlying the first face of the body portion. The body portion may include a second face overlying the insert. The insert may have a throughhole and a portion of the body portion may extend from the first face through the throughhole and the insert to the second face of the body portion.
    Type: Grant
    Filed: July 16, 2008
    Date of Patent: December 27, 2016
    Assignee: GM Global Technology Operations LLC
    Inventors: Brent D. Lowe, Mark T. Riefe, Omar S. Dessouki, Mohan Sundar, Kevin M. Thompson
  • Patent number: 9500242
    Abstract: An exemplary embodiment includes an automotive brake component, such as a brake drum or a brake rotor, and an inlay coupled to the automotive brake component. The inlay constituting at least a portion of a braking surface that is acted upon during a braking event. The inlay damping vibrations in the automotive brake component when the component is vibrated.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: November 22, 2016
    Assignee: GM Global Technology Operations LLC
    Inventors: Patrick J. Monsere, Mark T. Riefe, David B. Antanaitis, Brent D. Lowe, Mohan Sundar