Patents by Inventor Eric Christopher Sandstrom

Eric Christopher Sandstrom 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).

  • Concept for using software/electronics to calibrate the control system for an automatic transmission
    Patent number: 8321096
    Abstract: A software calibration strategy for calibrating solenoid controlled valves and valve systems in an automatic transmission. The strategy includes identifying a characteristic equation for the valve or valve system that is a mathematical relationship between a current applied to the solenoid and the pressure at the output of the valve or valve system. The valve or valve system is coupled to a test stand that depicts the operation of the valve or valve system in the transmission. Current signals are applied to the valve or valve system, and the output pressures are measured to determine coefficients in the equation using a curve fitting function. The coefficients are then stored in a control unit.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: November 27, 2012
    Assignee: Borg Warner Inc.
    Inventors: Eric Christopher Sandstrom, Mark Buchanan, William Vukovich, Melissa Koenig
  • Three position control solenoid for hydraulic activation
    Patent number: 8191698
    Abstract: A hydraulic system having a clutch assembly (30) which is hydraulically actuated, a pressure device (32) in fluid communication with the clutch assembly, and a multi-position actuator device (34) in fluid communication with the pressure device and the clutch assembly. The position of the actuator device includes at least a first position in order for the pressure device to fluidly communicate with the clutch assembly, a second position for maintaining fluid pressure in the clutch assembly, and a third position for bleeding the hydraulic system.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: June 5, 2012
    Assignee: Borgwarner Inc.
    Inventors: Larry Pritchard, Eric Christopher Sandstrom, Philip J. Francis
  • Three Position Control Solenoid for Hydraulic Activation
    Publication number: 20090314602
    Abstract: A hydraulic system having a clutch assembly (30) which is hydraulically actuated, a pressure device (32) in fluid communication with the clutch assembly, and a multi-position actuator device (34) in fluid communication with the pressure device and the clutch assembly. The position of the actuator device includes at least a first position in order for the pressure device to fluidly communicate with the clutch assembly, a second position for maintaining fluid pressure in the clutch assembly, and a third position for bleeding the hydraulic system.
    Type: Application
    Filed: June 27, 2007
    Publication date: December 24, 2009
    Inventors: Larry Pritchard, Eric Christopher Sandstrom, Philip J. Francis
  • Concept for using software/electronics to calibrate the control system for an automatic transmission
    Publication number: 20090099740
    Abstract: A software calibration strategy for calibrating solenoid controlled valves and valve systems in an automatic transmission. The strategy includes identifying a characteristic equation for the valve or valve system that is a mathematical relationship between a current applied to the solenoid and the pressure at the output of the valve or valve system. The valve or valve system is coupled to a test stand that depicts the operation of the valve or valve system in the transmission. Current signals are applied to the valve or valve system, and the output pressures are measured to determine coefficients in the equation using a curve fitting function. The coefficients are then stored in a control unit.
    Type: Application
    Filed: October 3, 2008
    Publication date: April 16, 2009
    Applicant: BorgWarmer Inc.
    Inventors: Eric Christopher Sandstrom, Mark Buchanan, William Vukovich, Melissa Koenig