Ouput torque modulation control of a transmission in a hybrid electric vehicle
AssigneeFord Global Technologies, LLC
InventorsIhab S. Soliman, Andrew J. Silveri
Life of this patent
Estimating the term…
Abstract
In a powertrain for motor vehicle that includes an engine, an electric machine, a transmission having an input driveably connected to the engine and a transmission output driveably connected to the electric machine, and a powertrain output driveably connected to the electric machine and wheels of the vehicle, a method for controlling torque during a shift includes transmitting engine torque through the transmission to the powertrain output; during a shift, operating the electric machine to modify the torque transmitted to the powertrain output; and storing energy generated by the electric machine during the shift.
Claims19
In a powertrain for motor vehicle that includes an engine, an electric machine able to function alternately as a motor and a generator, a transmission having an input driveably connected to the engine and a transmission output driveably connected to the electric machine, and a powertrain output driveably connected to the electric machine and wheels of the vehicle, a method for controlling torque during an upshift comprising the steps of:
- (a) using the engine to produce torque that is transmitted to the powertrain output through the transmission;
- (b) determining whether a battery state of charge is less than a reference maximum state of charge;
- (c) if the battery state of charge is less than the reference maximum state of charge, operating the electric machine as a generator to reduce the torque transmitted to the powertrain output during a ratio change phase of the upshift;
- and
- (d) if the battery state of charge is equal to or greater than the reference maximum state of charge, discontinuing use of the electric machine.
In a powertrain for motor vehicle that includes an engine, an electric machine able to function alternately as a motor and a generator, a transmission having an input driveably connected to the engine and a transmission output driveably connected to the electric machine, and a powertrain output driveably connected to the electric machine and wheels of the vehicle, a method for controlling torque during an downshift comprising the steps of:
- (a) using the engine to produce torque that is transmitted to the powertrain output through the transmission;
- (b) during a ratio change phase of the downshift, operating the electric machine as a motor to increase a magnitude of torque transmitted to the powertrain output;
- and
- (c) during a torque transfer phase of the downshift following the ratio change phase, operating the electric machine as a generator to decrease the net magnitude of torque transmitted to the powertrain output.
In a powertrain for motor vehicle that includes an engine, an electric machine able to function alternately as a motor and a generator, a transmission having an input driveably connected to the engine and a transmission output driveably connected to the electric machine, and a powertrain output driveably connected to the electric machine and wheels of the vehicle, a method for controlling torque during an downshift comprising the steps of:
- (a) using the engine to produce torque that is transmitted to the powertrain output through the transmission;
- (b) during a ratio change phase of the downshift, operating the electric machine as a motor to increase a net magnitude of torque transmitted to the powertrain output;
- (c) controlling a net torque transmitted to the transmission input by using the transmission to transmit power from the engine to the powertrain output and concurrently using the electric machine to transmit power to the powertrain output;
- (d) operating the electric machine as a generator to decrease said net magnitude of torque during a torque transfer phase of the downshift following the ratio change phase.
Dependencies are inferred from the claim text.