A four-wheel-drive vehicle including a powertrain operable to adjust a front- and rear-wheel driving force ratio that is a ratio between a driving force of front wheels and a driving force of rear wheels includes a control device that controls the powertrain and adjusts the front- and rear-wheel driving force ratio so as to reduce the driving force of the front wheels that are steered wheels, when it is detected that emergency avoidance to avoid collision with an avoidance target ahead in a traveling direction is necessary.

A device and a method for operating a multi-axle drive train for a vehicle. A first axle is operatively connected permanently and a second axle is operatively connected at least intermittently via a clutch to a drive device. For the second axle coupled to the drive device, a maximum torque of the drive device is reduced by a specific safety value. At drive start, the safety value is set to a specific initial value and subsequently is reduced or increased throughout a specific period of time.

A method for controlling gear shifting of a working machine includes determining a representation of a first total tractive force of the working machine for the entire set of drive units; initiating a procedure for redistributing the tractive force while maintaining the first total tractive force, including decreasing, at least partly towards a level suitable for shifting gear, the torque and tractive force of at least the first drive unit down, and increasing, in a compensational manner, the torque and tractive force of at least one of the other drive units not subject to gear shifting; monitoring, during the redistribution procedure, a representation of a second total tractive force of the working machine for the other drive units not subject to gear shifting, and, provided that the second total tractive force exceeds a threshold limit that forms a function of the first total tractive force: decreasing the torque and tractive force of at least the first drive unit down to the level suitable for shifting gear and performing gear shifting for at least the first drive unit.

The invention relates to a motor vehicle driveline and a method of controlling same. The driveline includes front wheels (11, 12) and rear wheels (14, 15), a controller (40) and a prime mover (11). Either the front wheels (11, 12) or all wheels are connected to the prime mover (11). The rear wheels (14, 15) may be connected via a prop shaft (23) with clutches (22; 27) at both ends. The decision to switch between 2WD and 4WD is taken on basis of speed-dependent trigger conditions.

A hill start assist system for a motor vehicle including a control system using sensor data from at least one sensor to provide the hill start assist with improved response behavior. The control system activating the hill start assist automatically and independently of whether the motor vehicle is on an upward incline depending on sensor data from the sensor indicating a local upward gradient in a driving surface in a region of a vehicle axle.

A method for controlling an electric four wheel drive hybrid vehicle includes steps of: receiving, by a controller, a longitudinal acceleration of the hybrid vehicle corresponding to a demand torque of a driver of the hybrid vehicle; and determining, by the controller, a torque distribution ratio between a front wheel drive torque and a rear wheel drive torque of the hybrid vehicle based on a weight moving ratio of the hybrid vehicle corresponding to the received longitudinal acceleration.

A control apparatus for a four-wheel-drive vehicle is configured to, during braking of the vehicle in a two-wheel-drive state, determine whether or not a degree of a yaw movement for deflecting the vehicle is larger than a predetermined first degree. When the degree of the yaw movement is larger than the first degree, the control apparatus increases a first coupling torque of a first coupling device and a second coupling torque of a second coupling device to a predetermined first torque value which is larger than zero, and controls a ground contact load adjusting device in such a manner that a first ground contact load at a rear wheel at an outer side with respect to the yaw movement becomes larger than a second ground contact load at a rear wheel at an inner side with respect to the yaw movement by a predetermined first load difference or more.

A vehicle comprising a steering axle, a steering device configured to steer the steering axle, wherein a steering wheel angle can be input via the steering device, wherein the steering wheel angle leadings to a steering angle of wheels of the steering axle, and a quotient of the steering wheel angle to the steering angle defines a steering ratio, a first drive, wherein the first drive allows a wheel-selective distribution of a first torque to the wheels of the steering axle, a second drive, wherein the second drive allows a wheel-selective distribution of a second torque to the wheels of a drive axle, and a controller configured to receive input variables defining driving dynamic variables of the vehicle, wherein the drive dynamic variables allow a change in the steering ratio to ascertained, and the controller outputs control information for distributing the drive torque.

In a method for front-rear driving torque distribution of a vehicle, a controlling apparatus determines an expected status parameter existing during steering of a vehicle based on a wheel angle of the vehicle. The controlling apparatus determines a current correction yawing moment based on an actual status parameter existing during the steering of the vehicle and the expected status parameter, and determines a mapping relationship between a correction yawing moment and a torque distribution coefficient based on the wheel angle and acceleration information of the vehicle. The controlling apparatus then determines a torque distribution coefficient of the vehicle based on the current correction yawing moment and the mapping relationship, and determines front and rear axle driving torques of the vehicle based on the torque distribution coefficient of the vehicle.

A method for controlling an electric rear axle drive (eRAD) includes, responsive to a vehicle being in DRIVE, operating the eRAD such that any torque output by the eRAD to drive rear wheels forward is less than torque output to drive front wheels forward. The method further includes, responsive to the vehicle being in REVERSE, operating the eRAD such that torque output by the eRAD to drive the rear wheels backwards is more than any torque output to drive the front wheels backwards.