Bayerische Motoren Werke Aktiengesellschaft

Christian Wimmer

Dirk Odenthal

Jan Felten

Michael Sailer

Werner Foag

Marc Espenhain

Claudio Struckmann

Nora Gruen

A method for detecting an eminent drive of at least one rear wheel of an electrically driven rear axle of a motor vehicle over a milled edge during a forward drive is provided. For this purpose, the motor vehicle has a vertical position sensor system on the front axle. Changes in the vertical position of at least one front wheel or the front axle are forwarded to a controller which limits the torque power that can be requested from the electric drive unit of the rear axle in the event of changes in the vertical position which exceed a specific threshold.

Method for controlling the drive force of a motor vehicle rear axle, which is driven by an electric motor, in the event of an imminent drive over a milled edge

A method and a control device are provided for operating a road-coupled hybrid vehicle. The hybrid vehicle has an electronic control unit, a primary motor associated with a first axle, and a secondary motor associated with a second axle. By way of the electronic control unit, the primary motor and the secondary motor are basically controlled in a drive-oriented manner such that preferentially only a single-axle drive by the primary motor is provided. Beginning with the secondary motor switched off, when a traction requirement is determined, the secondary motor is switched on, regardless of whether the vehicle is traveling on a curve. Beginning with the secondary motor switched on, when a traction requirement is not present, the secondary motor is not switched off until it is determined that the vehicle is not, or is no longer, traveling on a curve. A traction requirement is preferably determined at least when an expected traction requirement in the longitudinal direction is predicted when wheel slip is recognized or when the ASC control is active. An expected traction requirement in the longitudinal direction is predicted when a requested longitudinal dynamic setpoint parameter exceeds a defined threshold value based on a longitudinal dynamic potential parameter.

Method and control device for operating a road-coupled hybrid vehicle

A control apparatus and method for operating a road-bound hybrid vehicle are provided. The vehicles includes a control apparatus for controlling the drive torque of a first drive unit which is associated with a first axle and of the drive torque of a second drive unit which is associated with a second axle. One drive unit has at least one electric motor and the other drive unit has at least one internal combustion engine, wherein a load point increase, by which an energy store for operating the electric motor is charged, is limited by the internal combustion engine and the control unit. The limiting is performed by: in a first step, determining a maximum permissible upper limit for the load increase torque under optimum traction conditions depending on the steering angle and on the vehicle speed. In a second step, performing, as required, a torque-reducing adaptation of the previously determined upper limit to match traction-impairing environmental influences which may be present.

Method and control apparatus for operating a road-bound hybrid vehicle

A control system and method are provided for a motor vehicle having an electronic control unit, by which the drive torque of a drive unit can be variably distributed, as required, to at least two axles. A drive-oriented control can be specified for the purpose of a primarily single-axle drive. By way of a comparison unit, preferably on the basis of a circle of forces, a driving-dynamic desired parameter demanded particularly on a basis of the driver's intention is compared with a driving-dynamic potential parameter. A change from the drive-oriented control to a driving-dynamics-oriented control for the purpose of a primarily multi-axle drive takes place only when a defined threshold value, for example, 70%, is exceeded relative to the driving-dynamic potential parameter, for example, a limit range of the circle of forces.

Control system for a motor vehicle having an electronic control unit by which the drive torque of a drive unit can be variably distributed, as required, on at least two axles

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Munich, Germany

Christian Wimmer