Abstract: A method for restarting an engine of a vehicle stopped on a grade, comprising the steps of engaging a gear of a transmission through which the engine and wheels of the vehicle are drivably connected mutually, using brake pressure to engage wheel brakes and produce a road gradient wheel torque that holds the vehicle stationary on the grade, initiating an engine restart, operating the engine to produce wheel torque equal to or greater than the road gradient wheel torque, and releasing the brake pressure.

Abstract: A method for restarting an engine of a vehicle stopped on a grade, comprising the steps of engaging a gear of a transmission through which the engine and wheels of the vehicle are driveably connected mutually, using brake pressure to engage wheel brakes and produce a road gradient wheel torque that holds the vehicle stationary on the grade, initiating an engine restart, operating the engine to produce wheel torque equal to or greater than the road gradient wheel torque, and releasing the brake pressure.

Abstract: An electric vehicle such as a PHEV or a BEV and a method of control includes receiving from a user of the vehicle, at an interface of the vehicle, a distance until charge (DUC) value indicative of the distance from a current position that the vehicle is intended to be driven before the vehicle is recharged. Battery usage of the vehicle is controlled as a function of the DUC value. An initial estimate of the DUC value may be made by obtaining historical distance between charges (DBC) values indicative of the distance the vehicle has been driven between each of one or more pairs of consecutive charges of the vehicle. The estimated DUC value is based on the DBC values.

Abstract: A method for restarting an engine of a vehicle stopped on a grade, comprising the steps of engaging a gear of a transmission through which the engine and wheels of the vehicle are drivably connected mutually, using brake pressure to engage wheel brakes and produce a road gradient wheel torque that holds the vehicle stationary on the grade, initiating an engine restart, operating the engine to produce wheel torque equal to or greater than the road gradient wheel torque, and releasing the brake pressure.

Abstract: Calibration of an engine disconnect clutch for a hybrid electric powertrain. The clutch is prestroked while an engine and machine are stopped. A machine torque is increased until the machine starts rotating. A pressure of the clutch is adjusted as a function of a torque produced by the machine when the machine started rotating.

Abstract: A method for controlling restart of an engine in a hybrid electric powertrain, includes engaging a gear of a transmission, releasing a brake pedal, maintaining fluid pressure at an adaptively determined magnitude in a wheel brake, initiating a restart the engine, and reducing fluid pressure in the wheel brake when the engine restarts.

Abstract: A method of smoothing hybrid vehicle engine shutdown. A powered and rotating electric machine is used to slow deceleration of an unpowered and rotating engine by transferring torque through a clutch from the machine to the unpowered engine. Prior to the machine being powered, torque may be transferred through the clutch from the unpowered and rotating engine to the unpowered machine to accelerate passage of the engine through a resonance frequency.

Abstract: Calibration of an engine disconnect clutch for a hybrid electric powertrain. The clutch is prestroked while an engine and machine are stopped. A machine torque is increased until the machine starts rotating. A pressure of the clutch is adjusted as a function of a torque produced by the machine when the machine started rotating.

Abstract: A method for controlling a vehicle regenerative braking event includes maintaining a converter clutch closed while braking, while an engine connected to the impeller is running, opening the converter clutch when impeller speed reaches a reference speed difference relative to engine idle speed, and while the engine is off, opening the converter clutch when impeller speed reaches a speed required for a transmission pump, connected to an impeller, to produce line pressure at a desired magnitude.

Abstract: A method of smoothing hybrid vehicle engine shutdown. A powered and rotating electric machine is used to slow deceleration of an unpowered and rotating engine by transferring torque through a clutch from the machine to the unpowered engine. Prior to the machine being powered, torque may be transferred through the clutch from the unpowered and rotating engine to the unpowered machine to accelerate passage of the engine through a resonance frequency.

Abstract: A method for controlling a vehicle regenerative braking event includes maintaining a converter clutch closed while braking, while an engine connected to the impeller is running, opening the converter clutch when impeller speed reaches a reference speed difference relative to engine idle speed, and while the engine is off, opening the converter clutch when impeller speed reaches a speed required for a transmission pump, connected to an impeller, to produce line pressure at a desired magnitude.

Abstract: A method for restarting an engine in a hybrid electric powertrain includes using an auxiliary pump while the engine is shutdown to maintain stroke pressure in an oncoming transmission friction control element whose engagement is required to launch the vehicle following the restart, initiating an automatic engine restart, increasing a torque capacity of the control element while the engine is restarting, and using pressure produced by a transmission pump in the transmission to lock the control element after the engine restarts.

Abstract: A method for restarting an engine of a vehicle includes engaging a gear of a transmission that driveably connects the engine and wheels of the vehicle; maintaining a current brake pressure greater than a reference brake pressure; initiating an automatic engine restart; using a timer to count down during a period of predetermined length; using a pump to produce a desired magnitude of brake pressure sufficient to suppress a wheel torque surge produced by restarting the engine and to hold the vehicle stationary; and releasing the brake pressure if either the timer expires or a peak in engine speed occurs.

Abstract: A method for controlling an engine restart in a hybrid electric powertrain, including the steps of stopping the engine, using an electric power source and an electro-mechanical actuator connected to the source to engage a gear and stroke to zero torque capacity a dry clutch of a dual-clutch transmission, initiating an automatic engine restart, and increasing the torque capacity of the clutch to a desired torque capacity during the engine restart.

Abstract: A method for restarting an engine of a vehicle includes stopping the vehicle and holding the vehicle stationary, reducing engine speed, increasing a rate of reduction of engine speed, if engine speed is less than a reference speed when a desired restart of the engine is indicated, and initiating an engine restart when engine speed is substantially zero.

Abstract: A method for controlling restart of an engine in a hybrid electric powertrain includes stopping the vehicle and engine, initiating the restart, estimating time required to restart the engine after the restart is initiated, filling and stroking launch elements of a transmission, when the estimated time substantially equals a second estimated time required to fill and stroke said launch elements, and increasing the torque capacity of the launch elements to accelerate the vehicle.

Abstract: An electric vehicle such as a PHEV or a BEV and a method of control includes receiving from a user of the vehicle, at an interface of the vehicle, a distance until charge (DUC) value indicative of the distance from a current position that the vehicle is intended to be driven before the vehicle is recharged. Battery usage of the vehicle is controlled as a function of the DUC value. An initial estimate of the DUC value may be made by obtaining historical distance between charges (DBC) values indicative of the distance the vehicle has been driven between each of one or more pairs of consecutive charges of the vehicle. The estimated DUC value is based on the DBC values.

Abstract: A method for restarting an engine of a vehicle includes engaging a gear of a transmission that driveably connects the engine and wheels of the vehicle; maintaining a current brake pressure greater than a reference brake pressure; initiating an automatic engine restart; using a timer to count down during a period of predetermined length; using a pump to produce a desired magnitude of brake pressure sufficient to suppress a wheel torque surge produced by restarting the engine and to hold the vehicle stationary; and releasing the brake pressure if either the timer expires or a peak in engine speed occurs.

Abstract: A method for restarting an engine in a hybrid electric powertrain includes using an auxiliary pump while the engine is shutdown to maintain stroke pressure in an oncoming transmission friction control element whose engagement is required to launch the vehicle following the restart, initiating an automatic engine restart, increasing a torque capacity of the control element while the engine is restarting, and using pressure produced by a transmission pump in the transmission to lock the control element after the engine restarts.

Abstract: A method for restarting an engine of a vehicle stopped on a grade, comprising the steps of engaging a gear of a transmission through which the engine and wheels of the vehicle are driveably connected mutually, using brake pressure to engage wheel brakes and produce a road gradient wheel torque that holds the vehicle stationary on the grade, initiating an engine restart, operating the engine to produce wheel torque equal to or greater than the road gradient wheel torque, and releasing the brake pressure.