Abstract: A hybrid electric automotive powertrain includes an electric machine operable in propulsive and regenerative modes. The machine has positive and negative torque limits for the propulsive and regenerative modes, respectively, to reduce potential thermal damage to the machine due to overheating. The negative and positive torque limits are reduced independently as a temperature of the machine increases. The negative torque limit may be reduced at a greater rate than the positive torque limit.

Abstract: A hybrid vehicle operates in an electric-drive-only mode and one or more modes using an internal combustion engine. A control pedal is movable to respective positions by a driver for indicating a desired vehicle motion. A controller selectably activates the engine according to instantaneous values of a variable wheel output demand and a variable pull-up threshold. The pedal position is converted to a respective instantaneous wheel output demand in response to an initial value from a mapping relationship that is modified in response to a difference between the initial value and the variable pull-up threshold. The pull-up threshold may preferably be dynamically determined according to a state of charge of a battery for powering the electric drive. The modification to the wheel output demand preferably reduces the slope of the mapping relationship near the pull-up threshold to reduce pedal position sensitivity in a region near the dynamically varying pull-up threshold.

Abstract: A hybrid electric automotive powertrain includes an electric machine operable in propulsive and regenerative modes. The machine has positive and negative torque limits for the propulsive and regenerative modes, respectively, to reduce potential thermal damage to the machine due to overheating. The negative and positive torque limits are reduced independently as a temperature of the machine increases. The negative torque limit may be reduced at a greater rate than the positive torque limit.

Abstract: A hybrid vehicle operates in an electric-drive-only mode and one or more modes using an internal combustion engine. A control pedal is movable to respective positions by a driver for indicating a desired vehicle motion. A controller selectably activates the engine according to instantaneous values of a variable wheel output demand and a variable pull-up threshold. The pedal position is converted to a respective instantaneous wheel output demand in response to an initial value from a mapping relationship that is modified in response to a difference between the initial value and the variable pull-up threshold. The pull-up threshold may preferably be dynamically determined according to a state of charge of a battery for powering the electric drive. The modification to the wheel output demand preferably reduces the slope of the mapping relationship near the pull-up threshold to reduce pedal position sensitivity in a region near the dynamically varying pull-up threshold.