Patents by Inventor David A. VanRaaphorst

David A. VanRaaphorst 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).

  • Suspension System and Method of Control
    Publication number: 20150197133
    Abstract: A suspension system and a method of control. A load force on a first axle assembly may be increased when a ride height of the first axle assembly differs from the ride height of the second axle assembly by more than a threshold amount and the ride height of the first axle assembly is not within a ride height tolerance.
    Type: Application
    Filed: January 13, 2014
    Publication date: July 16, 2015
    Applicant: ArvinMeritor Technology, LLC
    Inventor: David VanRaaphorst
  • Closed loop pressure control for dual air spring configuration
    Patent number: 8899603
    Abstract: An active air suspension system includes an air spring assembly that has a piston airbag and a primary airbag mounted around the piston airbag to provide a variable force and rate dual air spring configuration. The air suspension system is configured to accurately control pressure within the piston airbags in a closed-loop manner. Continuous control of the piston pressure provides an accurate increase or decrease of spring rate or force depending on the controller inputs.
    Type: Grant
    Filed: April 1, 2009
    Date of Patent: December 2, 2014
    Assignee: ArvinMeritor Technology, LLC
    Inventor: David A. VanRaaphorst
  • Ride height leveling control for dual air spring configuration
    Patent number: 7950674
    Abstract: An air suspension system is configured to adjust and maintain a desired vehicle ride height and spring rate. The air suspension system includes a plurality of air spring assemblies that each include a piston airbag and a primary airbag mounted around the piston airbag. A controller receives ride height input data and adjusts pressures within the primary and piston airbags until the desired ride height and spring rate is achieved. The controller accommodates for system hardware differences by varying flow rates into and out of the primary and piston airbags relative to each other.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: May 31, 2011
    Assignee: ArvinMeritor Technology, LLC
    Inventors: Jonathan L. Honig, David A. VanRaaphorst
  • RIDE HEIGHT LEVELING CONTROL FOR DUAL AIR SPRING CONFIGURATION
    Publication number: 20100259018
    Abstract: An air suspension system is configured to adjust and maintain a desired vehicle ride height and spring rate. The air suspension system includes a plurality of air spring assemblies that each include a piston airbag and a primary airbag mounted around the piston airbag. A controller receives ride height input data and adjusts pressures within the primary and piston airbags until the desired ride height and spring rate is achieved. The controller accommodates for system hardware differences by varying flow rates into and out of the primary and piston airbags relative to each other.
    Type: Application
    Filed: April 9, 2009
    Publication date: October 14, 2010
    Inventors: Jonathan L. Honig, David A. VanRaaphorst
  • CLOSED LOOP PRESSURE CONTROL FOR DUAL AIR SPRING CONFIGURATION
    Publication number: 20100253017
    Abstract: An active air suspension system includes an air spring assembly that has a piston airbag and a primary airbag mounted around the piston airbag to provide a variable force and rate dual air spring configuration. The air suspension system is configured to accurately control pressure within the piston airbags in a closed-loop manner. Continuous control of the piston pressure provides an accurate increase or decrease of spring rate or force depending on the controller inputs.
    Type: Application
    Filed: April 1, 2009
    Publication date: October 7, 2010
    Inventor: David A. VanRaaphorst