Hydraulic Gain of Transmission Control Elements
AssigneeFord Global Technologies, LLC
InventorsDerek Kinch, Kurt H. Nickerson
Life of this patent
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Abstract
A system controlling gain in a control element includes a source of line pressure, a source of signal pressure, a control valve that controls communication between line pressure and the control element, including a first differential area communicating with control element pressure, and a second differential area, and a gain control valve that opens and closes communication between control element pressure and the second differential area in response to signal pressure.
Claims18
A system controlling gain in a control element, comprising:
- a source of line pressure;
- a source of signal pressure;
- a control valve that controls communication between line pressure and the control element, including a first differential area communicating with control element pressure, and a second differential area;
- a gain control valve that opens and closes communication between control element pressure and the second differential area in response to signal pressure.
A system for controlling hydraulic gain, comprising:
- first and second control elements;
- a source of line pressure;
- a source of signal pressure;
- a first control valve that controls communication between line pressure and the first control element, including a first differential area communicating with pressure supplied to the first control element, and a second differential area;
- a second control valve that controls communication between line pressure and the second control element, including a third differential area communicating with pressure supplied to the second control element, and a fourth differential area;
- a gain control valve responsive to signal pressure for opening and closing communication between pressure supplied to the first control element and the second differential area, and for opening and closing communication between pressure supplied to the second control element and the fourth differential area.
A method for controlling hydraulic gain, comprising:
- (a) controlling gain of pressure supplied to a control element from a source of line pressure through a control valve in response to pressure applied to first and second differential areas of the control valve;
- (b) using a gain control valve to open and close communication between pressure supplied to the control element and the second differential area in response to a signal pressure.
Dependencies are inferred from the claim text.