Abstract: A transmission control system for a hybrid electric vehicle including an electric machine includes an energy storage device that is selectively charged by the electric machine and that selectively powers the electric machine. A driver input device generates a driver input signal. A control module receives the driver input signal, determines a torque load of the electric machine based on a state of charge (SOC) of the energy storage device and determines a transmission ratio based on the torque load and the driver input signal.

Abstract: A transmission control system for a vehicle includes a driver input device that generates a driver input signal and a control module that receives the driver input signal. The control module determines an operating mode of a transmission based on the driver input signal and selects a gear ratio of the transmission based on the operating mode. The operating mode includes one of a maximum performance mode, a power mode and a fuel economy mode.

Abstract: A method and apparatus for adapting powertrain braking to mass, grade, and brake temperature. Vehicle mass is determined using a vehicle speed sensor and an tractive effort model based on engine-torque delivered, torque converter multiplications, and transmission ratio and tire rolling radius effects. Road grade is continuously calculated and altitude change is calculated based on grade and distance traveled. To achieve an ideal amount of powertrain braking, powertrain braking is directed towards a designed coast performance target based on deceleration as a function of vehicle speed. Fuzzy logic is used to evaluate driver intentions, grade load conditions, terrain conditions, brake conditions and other vehicle information to determine the actual, optimal powertrain braking control. A real time brake thermal model is developed to provide increased powertrain under extreme brake conditions. The powertrain braking efforts are limited when restricted by available tractive efforts.

Abstract: A method and apparatus for adapting powertrain braking to mass, grade, and brake temperature. Vehicle mass is determined using a vehicle speed sensor and an tractive effort model based on engine-torque delivered, torque converter multiplications, and transmission ratio and tire rolling radius effects. Road grade is continuously calculated and altitude change is calculated based on grade and distance traveled. To achieve an ideal amount of powertrain braking, powertrain braking is directed towards a designed coast performance target based on deceleration as a function of vehicle speed. Fuzzy logic is used to evaluate driver intentions, grade load conditions, terrain conditions, brake conditions and other vehicle information to determine the actual, optimal powertrain braking control. A real time brake thermal model is developed to provide increased powertrain under extreme brake conditions. The powertrain braking efforts are limited when restricted by available tractive efforts.