Brooks Kushman P.C.
Method of controlling a transmission having an impeller clutch
Impeller speed, which is difficult to measure when a torque converter includes an impeller clutch, is estimated based on a known relationship among impeller speed, turbine speed, and turbine torque. Turbine torque may be directly measured by a turbine torque sensor or estimated based on other measurements such as output shaft torque or vehicle acceleration. The relationship is stored in a controller in terms of the coefficients of a second order polynomial relating turbine torque to impeller speed and turbine speed. A slip speed is calculated based on a measured input shaft speed and the estimated impeller speed. Closed loop control is used to adjust the impeller clutch torque capacity to maintain a target slip.
Ford Global Technologies, LLC
F F F F F F F F F F F F
F16D F16D F16D F16D F16D F16D F16D F16D F16H F16D F16D F16H
additional additional additional additional additional inventional additional additional additional inventional additional additional
Felix Hong Seunghoon Zhengyu Matthew John Weitian
Nedorezov Jiang Lee Dai Shelton Chen