A method and a system for a vehicle comprising: one or more power sources including at least one electrical machine; and a drivetrain for transferring torque between the one or more power sources and at least one drive wheel of the vehicle. The method comprises: controlling, when no positive drive torque (T.sub.drive) is transferred from the drivetrain to the at least one drive wheel, the at least one electrical machine to provide a backlash torque (T.sub.backlash) to the drivetrain, the backlash torque (T.sub.backlash) having a controlled value for turning the drivetrain if there is a backlash present in the drivetrain.

A method and a system for a vehicle comprising: one or more power sources including at least one electrical machine; and a drivetrain for transferring torque between the one or more power sources and at least one drive wheel of the vehicle. The method comprises: controlling, when no positive drive torque (T.sub.drive) is transferred from the drivetrain to the at least one drive wheel, the at least one electrical machine to provide a backlash torque (T.sub.backlash) to the drivetrain, the backlash torque (T.sub.backlash) having a controlled value for turning the drivetrain if there is a backlash present in the drivetrain.

Methods and systems are provided for operating a driveline of a hybrid vehicle that includes an internal combustion engine, an electric machine, an integrated starter/generator, and a transmission are described. In one example, transmission output torque and electric machine torque are adjusted while a brake pedal and accelerator pedal are contemporaneously applied.

Methods and systems are provided for operating a driveline of a hybrid vehicle that includes an internal combustion engine, an electric machine, an integrated starter/generator, and a transmission are described. In one example, transmission output torque and electric machine torque are adjusted while a brake pedal and accelerator pedal are contemporaneously applied.

An embodiment system for controlling power consumption of a high voltage battery includes a driver's requested torque determiner configured to determine a driver's intention to accelerate a vehicle and to calculate a driver's requested torque, an available power amount calculator configured to calculate an available power amount of a difference between an existing power consumption amount of electronic components configured to use the high voltage battery as a power source and a minimum power consumption amount of the electronic components required by a vehicle system, and a driving controller configured to variably control power applied to the electronic components and power applied to a drive motor of the vehicle upon determining the driver's intention to accelerate the vehicle.

A shift control method for a hybrid vehicle includes: determining whether a request for a kick-down shift has been made; identifying predetermined input torque increase conditions when the kick-down shift request is made; comparing a predetermined input torque increase amount with a predetermined reference value when all of the input torque increase conditions are satisfied; and controlling a driving motor or an auxiliary motor to additionally output the input torque increase amount, based on the result of comparing the input torque increase amount with the reference value.

A hybrid electric vehicle comprises a set of wheels, a mechanical transmission adapted to provide torque to the set of wheels, an electric motor coupled to and providing motive force to the mechanical transmission, battery storage coupled to and supplying electrical power to the electric motor, and a gasoline compression ignition (GCI) engine coupled to at least one of the mechanical transmission and the electric motor so as to provide mechanical energy to the mechanical transmission and energy for operating the electric motor.

A hybrid electric vehicle comprises a set of wheels, a mechanical transmission adapted to provide torque to the set of wheels, an electric motor coupled to and providing motive force to the mechanical transmission, battery storage coupled to and supplying electrical power to the electric motor, and a gasoline compression ignition (GCI) engine coupled to at least one of the mechanical transmission and the electric motor so as to provide mechanical energy to the mechanical transmission and energy for operating the electric motor.

A driving force control device for a vehicle is provided, which includes a motor, an engine, and a controller. The controller sets a target torque of the vehicle corresponding to accelerator operation, distributes a target engine torque, based on the target torque, and outputs a control signal corresponding to the target engine torque. The controller estimates a future amount of intake air to a cylinder based on the target engine torque, and estimates an engine torque after a setup time from the present time based on the estimated future amount of intake air. The controller sets a target motor torque after the setup time based on the estimated engine torque after the setup time so that the target torque is achieved, and outputs a control signal corresponding to the target motor torque to synchronize a torque response of the engine with a torque response of the motor.

A driving force control device for a vehicle is provided, which includes a motor, an engine, and a controller. The controller sets a target torque of the vehicle corresponding to accelerator operation, and distributes a target engine torque according to a distribution rule defined beforehand, based on the target torque of the vehicle, and outputs a control signal corresponding to the target engine torque to the engine. The controller estimates a future amount of intake air to a cylinder based on the target engine torque, and estimates a torque of the engine in the future based on the estimated future amount of intake air. The controller sets a target motor torque based on the estimated torque of the engine so that the target torque of the vehicle is achieved in the future, and outputs a control signal corresponding to the target motor torque to the motor.