A transfer (13) that changes a distribution ratio of torque to be transmitted to a wheel using an electric motor (43), is controlled by a TF-ECU (18). The TF-ECU (18) includes a driver circuit (200) that drives the electric motor (43), a current sensor (53) that detects an actual current of the electric motor (43), and a microcomputer (100) that calculates a target current (I*) corresponding to a desired distribution ratio of torque and performs current feedback control for calculating an operation amount (D) of the electric motor (43) so as to adjust an actual current (Ia) to the target current (I*), and then outputs to the driver circuit (200) a drive signal corresponding to the operation amount (D).

An agricultural work machine comprising a front axle and a rear axle, an internal combustion engine, at least one hybrid module, and a transmission device is disclosed. The internal combustion engine and the hybrid module are each operatively connected to the transmission device with both output power from the internal combustion engine and output power from the hybrid module absorbed via the transmission device. The output powers are transferred together to the rear axle so that rear wheels of the agricultural work machine arranged on the rear axle can be driven. The internal combustion engine is arranged in a front region of the agricultural work machine and the hybrid module is arranged in a rear region of the agricultural work machine. The output powers from the internal combustion engine and the hybrid module are supplied separately to the transmission device.

A hybrid vehicle system includes an engine, a transmission mechanism, first and second clutch mechanisms, a motor generator, and a forward-reverse travel switching mechanism. The engine outputs torque. The transmission mechanism converts the torque at a predetermined transmission gear ratio. The first clutch mechanism allows and disallows power transmission between the transmission mechanism and a drive wheel. The motor generator is coupled to a power transmission path between the first clutch mechanism and the drive wheel. The second clutch mechanism allows and disallows power transmission between the motor generator and the drive wheel. The forward-reverse travel switching mechanism is coupled to a power transmission path between the engine and the transmission mechanism. The forward-reverse travel switching mechanism is coupled to a countershaft. The forward-reverse travel switching mechanism switches among a forward-travel direct coupling state, a reverse-travel direct coupling state, and a neutral state.

A transfer device of a vehicle is provided, in which an auxiliary-drive-wheel output shaft extending in parallel with a main-drive-wheel output shaft is connected to a propeller shaft having a universal joint. An end part of the auxiliary-drive-wheel output shaft on a propeller shaft side is formed in a hollow shape and includes a fitting part configured to be spline-engaged with a joint part provided to the universal joint. The joint part is provided with a centering part which is inserted into a centering hole formed in a flange part provided to one side of the auxiliary-drive-wheel output shaft so that the joint part is centered on the auxiliary-drive-wheel output shaft. The flange part is sandwiched between a spacer and the joint part, and a bolt member is attached to a bolt hole formed in the centering part so that the propeller shaft is assembled to the auxiliary-drive-wheel output shaft.

When braking of the electric vehicle is performed, the braking is controlled based on a target braking split ratio which is a target value of the ratio of the braking force that is applied to the rear wheels to a total braking force that is applied to the front and rear wheels. In this case, an initial value of the target braking split ratio is set to a value within an allowable range about a transmission split ratio when braking of the electric vehicle is started while the electric vehicle is being braked by the motor, the transmission split ratio being the ratio of a braking force that is transmitted from a drive shaft to the rear wheels via a driving force split device to a total braking force that is transmitted from the drive shaft to the front and rear wheels via the driving force split device.

A vehicle drive device and a control method therefor are provided. The vehicle drive device includes: a power source including a first rotating electrical machine; a second rotating electrical machine; a differential unit including three rotating elements to which a first output shaft, a second output shaft, and the second rotating electrical machine are connected; and an electronic control device. The electronic control device regeneratively controls the first rotating electrical machine and the second rotating electrical machine in such a manner that negative torque is applied to the first output shaft and the second output shaft, when performing regenerative control by the second rotating electrical machine in a drive mode in which torque from the power source is distributed to the first output shaft and the second output shaft by controlling torque of the second rotating electrical machine during deceleration of a vehicle.

The present invention relates to a transfer gearbox having an input shaft, a first output shaft, a second output shaft, a friction clutch, by means of which, in a manner which is dependent on its engagement state, a variable proportion of a drive torque which is transmitted from the input shaft to the first output shaft can be transmitted to the second output shaft, and a rotationally driven actuator unit for controlling the engagement state of the friction clutch. Furthermore, the transfer gearbox has an electromagnetically actuable latch for locking the actuator unit as required.

An active transfer case is equipped with a multi-plate clutch assembly, a clutch actuation mechanism configured to selectively engage the clutch assembly, a power-operated clutch actuator configured to control actuation of the clutch actuation mechanism, a power-operated actuator brake associated with the power-operated clutch actuator, and a control system configured to control actuation of the clutch actuator and the actuator brake while employing a preemptive check of the functionality of the actuator brake.

Disclosed is a travel control apparatus for a four-wheel drive vehicle in which the states of engagements between a drive output part for secondary drive wheels and left and right secondary drive wheel axles are each changed to a torque transmission state or a torque transmission interruption state. The ratio of rotational speed of the drive output part to the average of rotational speeds of primary drive wheels is greater than 1. When the engagement states corresponding to the secondary drive wheels on the outer and inner sides of a turning locus have been set to the torque transmission state and the torque transmission interruption state, respectively, the engagement state having been set to the torque transmission state is changed to the torque transmission interruption state upon determination that an accelerator pedal is not operated and the magnitude of lateral acceleration is equal to or greater than a predetermined threshold.

A drive device includes a first clutch mechanism that couples or decouples power transmission systems for front and rear wheels, a first electric motor disposed on a front or rear wheel side and coupled to the first clutch mechanism, a second electric motor disposed on the other of the front and rear wheel sides and coupled to the first clutch mechanism, a second clutch mechanism that couples or decouples the first electric motor and front drive shafts, a planetary gear mechanism that distributes output of the first electric motor to the first and second clutch mechanisms, and a third clutch mechanism that limits a difference between a first rotational element that transmits the output of the first electric motor to the first clutch mechanism and a second rotational element that transmits the output of the first electric motor to the second clutch mechanism.