Patents by Inventor Zheng David Lou

Zheng David Lou 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).

  • Solenoid operated hydraulic control valve
    Publication number: 20040226619
    Abstract: A pressure control valve with a hydraulic system of an automatic transmission for a motor vehicle includes a valve body defining a control chamber, fluid ports communicating with the control chamber, and a valve spool having spaced pressure control lands located in the control chamber, the valve spool urged by a compression spring in an opposite direction from an electromagnetic force developed on the spool when a solenoid is energized. In one embodiment a control land is formed with a pressure feedback orifice that communicates a control port with a feedback chamber. The valve spool can be formed with different sized control lands. The feedback orifice is substantially insensitive to fluid temperature variation.
    Type: Application
    Filed: February 21, 2002
    Publication date: November 18, 2004
    Inventor: Zheng David Lou
  • Solenoid operated hydraulic control valve
    Publication number: 20030164193
    Abstract: A pressure control valve with a hydraulic system of an automatic transmission for a motor vehicle includes a valve body defining a control chamber, fluid ports communicating with the control chamber, and a valve spool having spaced pressure control lands located in the control chamber, the valve spool urged by a compression spring in an opposite direction from an electromagnetic force developed on the spool when a solenoid is energized. In one embodiment a control land is formed with a pressure feedback orifice that communicates a control port with a feedback chamber. The valve spool can be formed with different sized control lands. The feedback orifice is substantially insensitive to fluid temperature variation.
    Type: Application
    Filed: February 21, 2002
    Publication date: September 4, 2003
    Inventor: Zheng David Lou
  • Solenoid operated hydraulic control valve
    Patent number: 6435213
    Abstract: A pressure control valve with a hydraulic system of an automatic transmission for a motor vehicle includes a valve body defining a control chamber, fluid ports communicating with the control chamber, and a valve spool having spaced pressure control lands located in the control chamber, the valve spool urged by a compression spring in an opposite direction from an electromagnetic force developed on the spool when a solenoid is energized. In one embodiment a control land is formed with a pressure feedback orifice that communicates a control port with a feedback chamber. The valve spool can be formed with different sized control lands. The feedback orifice is substantially insensitive to fluid temperature variation.
    Type: Grant
    Filed: April 23, 1999
    Date of Patent: August 20, 2002
    Assignee: Visteon Global Technologies, Inc.
    Inventor: Zheng David Lou
  • SOLEMOID OPERATED HYDRAULIC CONTROL VALVE
    Publication number: 20020007857
    Abstract: A pressure control valve with a hydraulic system of an automatic transmission for a motor vehicle includes a valve body defining a control chamber, fluid ports communicating with the control chamber, and a valve spool having spaced pressure control lands located in the control chamber, the valve spool urged by a compression spring in an opposite direction from an electromagnetic force developed on the spool when a solenoid is energized. In one embodiment a control land is formed with a pressure feedback orifice that communicates a control port with a feedback chamber. The valve spool can be formed with different sized control lands. The feedback orifice is substantially insensitive to fluid temperature variation.
    Type: Application
    Filed: April 23, 1999
    Publication date: January 24, 2002
    Inventor: ZHENG DAVID LOU