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AssigneeFord Global Technologies, LLC
InventorsJerry Dean Robichaux, Timothy Joseph Clark, Tobias John Pallett
Estimating the term…
A system and method for controlling a powertrain including an automatic transmission include determining a desired wheel torque, determining engine speed, determining turbine speed, determining a selected gear and associated selected gear ratio, determining a transmission spin loss based on a first function of the turbine speed and the selected gear, determining a transmission torque proportional loss based on a second function of the turbine speed and the selected gear, determining a desired engine torque based on the transmission spin loss, the transmission torque proportional loss, and the selected gear ratio, and controlling the powertrain using the desired engine torque such that actual wheel torque approaches the desired wheel torque. A transmission pump loss may also be determined based on line pressure and engine speed. An alternative strategy determines engine torque using a power-based calculation if the vehicle speed is above a predetermined threshold, and a gear ratio based calculation if the vehicle speed does not exceed the predetermined threshold. Strategies for determination of the desired or requested engine torque during a gear shift or ratio change include a first strategy which determines an engine torque corresponding to the current gear ratio and the target gear ratio with the desired engine torque being interpolated between the two values. Turbine speed may be determined by an appropriate sensor or estimated. Alternatively, torque converter slip may be utilized with the slip value held constant for a predetermined time during the ratio change.
A method for controlling a powertrain including an internal combustion engine and an automatic transmission having a plurality of selectable gears with associated gear ratios, the automatic transmission being coupled to the internal combustion engine via a torque converter having a turbine, the method comprising:
A method for controlling a powertrain including an internal combustion engine and an automatic transmission having a plurality of selectable gears with associated gear ratios, the method comprising:
A computer readable storage medium having stored data representing instructions executable by a computer to control a powertrain having an internal combustion engine and an automatic transmission, the computer readable storage medium comprising:
A computer readable storage medium having stored data representing instructions executable by a computer to control a powertrain having an internal combustion engine and an automatic transmission, the computer readable storage medium comprising:
A computer readable storage medium having stored data representing instructions executable by a computer to control a powertrain having an internal combustion engine and an automatic transmission, the computer readable storage medium comprising:
Dependencies are inferred from the claim text.