Ford Global Technolgoies, LLC

Karl M Jungbluth

Todd J Newman

Christopher Marcus Williams

Kurt Howard Nickerson

Ralph S Walker

Terry Gene Feldpausch

Brian D Bishop

Henry A Rebandt

Jesse Brunais

Pete Bezjak

When a vehicle driver selects reverse while a vehicle is moving forward, a transmission controller applies friction shift elements within the transmission to create a partial tie-up condition to decelerate the vehicle. Once the vehicle slows below a threshold speed, the controller engages a selectable one way brake and releases some of the friction shift elements to engage a reverse gear ratio.

Vehicle and method to control rolling engagements

A method for controlling a transmission includes applying a reference stroke pressure to an oncoming control element while executing a downshift to a target gear, determining a stroke pressure adjustment in response to a turbine speed flare during the downshift, and re-executing the downshift while applying to the oncoming element an adapted stroke pressure that is a sum of the stroke pressure adjustment and the reference stroke pressure.

Adapting stroke pressure of a transmission control element

A method for controlling a coasting downshift in an automatic transmission having a torque converter that includes an impeller driveably connected to an engine and a turbine hydrokinetically coupled to the impeller and driveably connected to the transmission input. During a coast condition, the speed of the turbine decreases, and the speed of the engine decreases to and is maintained at an engine idle speed. After the downshift event begins, the turbine speed increases due a transfer of torque from an off-going transmission control element to an oncoming control element. Engine speed increases steadily until it reaches the target engine speed. The downshift is completed, and engine speed decreases until it again reaches the idle speed.

Control of coasting downshifts in an automatic transmission for motor vehicles

A system for actuating a clutch that alternately driveably connects and disconnects components, includes a clutch having a piston that includes a first apply area and a second apply area, a fluid pressure source, a source of variable control pressure, and a control coupled with the fluid pressure source and operative in response to the control pressure to engage the clutch initially by increasing pressure steadily at the first apply area up to a first magnitude followed by a rapid increase in pressure at the first apply area and the second apply area above the first magnitude to a second magnitude.

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Commerce, MI, United States of America

Karl M Jungbluth