Disclosed is a method for control of a vehicle with a drive system comprising a planetary gear and a first and second electrical machine, connected with their rotors to the components of the planetary gear, a braking of the vehicle towards stop occurs by way of a distribution of the desired braking torque between the first and the second electrical machines, and wherein such electrical machines are controlled to transmit a total torque to an output shaft of the planetary gear, which corresponds to the desired braking torque at least to one predetermined low speed limit, before the vehicle stops.

A drive system for a vehicle includes two electrical machines arranged between a combustion engine and an input shaft to a gearbox. The first electrical machine rotor is connected with a planetary gear component, and the input shaft of the gearbox is connected with another planetary gear component. The second electrical machine rotor is connected via a transmission with the output shaft of the combustion engine, which is connected with another planetary gear component. planetary gear's components may be locked together to rotate at the same rotational speed, and released wherein the components rotate at different rotational speeds. Further, the output shaft of the combustion engine may either be locked in position with or released from the additional planetary gear component.

A drive system for a vehicle comprises an electrical machine, arranged between a combustion engine and an input shaft to a gearbox. The rotor of the electrical machine is connected with a component of a planetary gear, and the input shaft of the gearbox is connected with another component of such planetary gear. A first locking means may be moved between a locked position, in which the planetary gear's three components rotate at the same rotational speed, and a release position, in which the components are allowed to rotate at different rotational speeds. A second locking means is moveable between a locked position in which the output shaft of the combustion engine is locked together with a component in the planetary gear, and a release position, in which the combustion engine's output shaft is decoupled from such a component.

An electronic control unit executes gradual reduction control when a friction clutch is to be maintained in a fully engaged state such that an input rotary member and an output rotary member rotate integrally. As a result, a motor current supplied to a motor is adjusted to a lower current value. Thus, an average current value of the motor current supplied to the motor when the friction clutch is to be maintained in the fully engaged state is appropriately reduced.

A vehicular power transmission device includes a differential mechanism including a pair of side gears, an inner case, and an outer case, a pair of side gear shafts respectively connected to the side gears and transmitting power to a pair of wheels, a clutch mechanism including a clutch hub, a clutch drum, a friction engagement element, and a piston, and an actuator configured to drive the piston, in which the clutch hub and the clutch drum include meshing teeth, the piston includes first meshing teeth and second meshing teeth, and the clutch hub, the clutch drum, and the piston are configured to switch an operation mode of the vehicular power transmission device to a first mode and a second mode.

A four-wheel drive hybrid vehicle, in which all wheels are driven by an engine, and in which a spatial restriction to arrange a front motor is reduced. The hybrid vehicle comprises: an engine disposed on a side of front wheels; a first motor; an exhaust pipe for discharging exhaust gas from a rear side of the vehicle; a first propeller shaft that delivers output power of the engine to rear wheels; a transfer that distributes the output power of the engine to the front wheels; a second propeller shaft that delivers a drive force from the transfer to the front wheels; and a second motor that applies torque to the front wheels. The second propeller shaft is arranged on the other side of the exhaust pipe across the first propeller shaft while being connected to the second propeller shaft.

A drive system for a vehicle comprises two electrical machines arranged between a combustion engine and an input shaft to a gearbox. The first machine's rotor and the input shaft of the gearbox are each connected to a separate component of a planetary gear. The second electrical machine's rotor is connected with the output shaft of the combustion engine, which is connected with another component of the planetary gear. A first locking means may be moved between a locked position, in which the planetary gear's three components rotate at the same rotational speed, and a release position, allowing for different rotational speeds. A second locking means is moveable between a locked position, in which the output shaft of the combustion engine is locked together with the second machine's rotor and a release position, in which the combustion engine's output shaft is disconnected from the second machine's rotor.

In a method for controlling a vehicle with a drive system comprising a power unit configuration adapted to provide output for the vehicle's operation, and further comprising a planetary gear and a first and second electrical machine, connected to components in the planetary gear via their rotors, a locking means is moved from a locked position, in which two of the planetary gear's components are locked together, so that the three components of the planetary gear rotate with the same speed, to a release position, when the vehicle is driven with the locking means in a locked position, by carrying out the following method steps. The power unit configuration is controlled in order to achieve torque balance between the components that are locked together by the locking means, and such locking means are moved into a release position, when said torque balance prevails.

A vehicle drive-train with a drive engine, a drive output and a transmission device connected in the power flow between the drive engine and the drive output. The transmission device has at least two transmission units whose transmission ratios can be varied continuously, at least in some ranges, and which are arranged in power-trains running parallel with one another between the drive engine and the drive output. The power-trains can each be functionally connected with a respective axle of the drive output. At least one shifting element is provided by which the power-trains can be functionally connected in the area between the transmission units and the drivable axles. In addition, a method for operating the vehicle drive-train is described, in which the shifting element is actuated as a function of torque to be transmitted via the transmission device between the drive engine and the drive output.

In a method for controlling a vehicle with a drive system comprising an output shaft of a combustion engine and a planetary gear with a first and a second electrical machine, connected via their rotors to the components of the planetary gear, the combustion engine is started while the vehicle is driven by ensuring that the rotor of the second electrical machine is connected with the output shaft of the combustion engine, and controlling such electrical machine's rotational speed towards the combustion engine's idling speed, whereupon fuel injection into the combustion engine is carried out to start the latter.