Patents by Inventor Dennis M. Greene

Dennis M. Greene 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).

  • Control system for hydrostatic pump
    Patent number: 6640687
    Abstract: A non-feedback proportional system is provided to achieve desired operating characteristics which will allow the control of a hydrostatic transmission to closely approximate the control performance of a displacement feedback control system by establishing certain parameters relating to (1) the servo spring rate; (2) the valve plate index; (3) valve plate crossport/trap; (4) valve plate porting geometry; (5) swashplate offset; and (6) piston bore volume.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: November 4, 2003
    Assignee: Sauer-Danfoss Inc.
    Inventors: Stephen C. Frantz, Shannon D. Carver, Craig C. Klocke, Dennis M. Greene
  • Electronic bore pressure optimization mechanism
    Patent number: 6510779
    Abstract: An electronic bore pressure optimization mechanism for dynamically varying the cylinder block piston bore pressure profile in a multiple piston hydraulic unit includes a valve means having a variable orifice disposed in the end cap for metering fluid between leading and trailing pistons in a transition region or between a piston in a transition region and a high or low pressure source; and means for generating a control error signal to the valve means so as to adjust the size of the variable orifice based upon the control signal.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: January 28, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Dennis M. Greene, Jeff L. Herrin
  • Electronic bore pressure optimization mechanism
    Publication number: 20020106283
    Abstract: An electronic bore pressure optimization mechanism for dynamically varying the cylinder block piston bore pressure profile in a multiple piston hydraulic unit includes a valve means having a variable orifice disposed in the end cap for metering fluid between leading and trailing pistons in a transition region or between a piston in a transition region and a high or low pressure source; and means for generating a control error signal to the valve means so as to adjust the size of the variable orifice based upon the control signal.
    Type: Application
    Filed: March 7, 2001
    Publication date: August 8, 2002
    Inventors: Dennis M. Greene, Jeff L. Herrin
  • Swashplate position assist mechanism
    Patent number: 6413055
    Abstract: A swashplate assist mechanism for dynamically varying swashplate moments in a multiple piston hydraulic unit includes a valve means disposed in the swashplate and defining a variable orifice for metering fluid from at least one of the pistons; and means for generating a control error signal to the valve means so as to adjust the size of the variable orifice based upon the control error signal. When fluid is metered from a leading piston to a trailing piston near one or more of the pressure transition zones, or when fluid is metered from a trailing piston to a leading piston near the opposite transition zones, the swashplate moments can be reduced.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: July 2, 2002
    Assignee: Sauer-Danfoss Inc.
    Inventors: Kerry G. Geringer, Dennis M. Greene, Jeff L. Herrin, Richard L. Otto