Control of parallel reaction brakes in a transmission
AssigneeFord Global Technologies, LLC
InventorsGregory D. Goleski, Charles W. Suter, Bradley R. Heuver, Brad W. Probert, Kenneth L. Nowaczyk
Life of this patent
Estimating the term…
Abstract
A method for controlling brakes of an automatic transmission including a first brake arranged in parallel with an overrunning brake between a planet pinion carrier and a housing, includes using the overrunning brake to provide brake torque equal to or less than a reference brake torque under positive torque conditions, increasing a torque capacity of the first brake when brake torque is greater than the reference brake torque, and fully engaging the first brake.
Claims17
A method for controlling brakes of an automatic transmission including a first brake arranged in parallel with an overrunning brake between a planet pinion carrier and a housing, comprising the steps of:
- (a) under positive torque conditions, using the overrunning brake to provide brake torque equal to or less than a reference brake torque;
- (b) increasing a torque capacity of the first brake when brake torque is greater than the reference brake torque;
- and
- (c) fully engaging the first brake.
A method for controlling brakes of an automatic transmission including a first brake arranged in parallel with an overrunning brake between a planet pinion carrier and a housing, comprising the steps of:
- (a) under positive torque conditions, using the overrunning brake to provide brake torque equal to or less than a reference brake torque;
- (b) increasing a torque capacity of the first brake when brake torque is greater than the reference brake torque;
- (c) fully engaging the first brake;
- (d) under a negative torque conditions when a current gear is produced automatically by the transmission, using the first brake to provide brake torque;
- (e) under a negative torque conditions when a current gear is produced automatically by the transmission, fully disengaging the first brake when a speed of an output shaft is greater than a predetermined speed;
- and
- (f) under a negative torque conditions when a current gear is produced automatically by the transmission, stroking the first brake when the output shaft speed is less than a predetermined speed.
A method for controlling brakes of an automatic transmission including a first brake arranged in parallel with an overrunning brake between a planet pinion carrier and a housing, comprising the steps of:
- (a) under positive torque conditions, stroking the first brake and using the overrunning brake to provide brake torque equal to or less than a reference brake torque;
- (b) increasing a torque capacity of the first brake when brake torque is greater than the reference brake torque;
- (c) fully engaging the first brake;
- (d) disengaging the first brake to permit a gear change to occur.
Dependencies are inferred from the claim text.