Method for operating a driver assistance system in a motor vehicle, the system supporting the driver in coasting mode, and motor vehicle

Abstract

The invention relates to a method for operating a driver assistance system (28) in a motor vehicle (7), the powertrain of which can be operated in freewheel mode, in which a drive motor (34) is decoupled from the rest of the powertrain by a disconnect clutch (35). According to said method, if the driver assistance system (28) is activated, when the driver stops actuating the accelerator pedal andat least one coasting destination (9) requiring a deceleration of the motor vehicle (7) is determined, an action plan comprising at least one measure for a targeted deceleration of the motor vehicle (7) is determined, taking into account at least one efficiency criterion related to the energy balance of the motor vehicle (7), a time criterion related to the deceleration to the coasting destination(9), and predictive route data describing the route to the coasting destination (9), and said action plan is used for the longitudinal control of the motor vehicle (7), the measures being selected from a group of measures comprising at least operation in freewheel mode and operation in overrun mode. A stopping position (16) is determined as the coasting destination (9) and the action plan is determined in order to decelerate the motor vehicle (7) to a standstill at the stopping position (16).

Description

technical field [0001] The invention relates to a method for operating a driver assistance system in a motor vehicle, which assists the driver during coasting, the drive train of which can be operated in an idling mode, In the freewheeling mode, the drive unit is separated from the rest of the drive train by the disengagement clutch, and when the driver assistance system is active, when the driver terminates the accelerator pedal and detects at least one coasting that requires deceleration of the motor vehicle When targeting, taking into account at least one efficiency criterion with respect to the energy budget of the motor vehicle, a target criterion with respect to the deceleration to the coasting target, projected road segment data describing the journey to the coasting target, it is determined that at least one Program of action for the purposeful deceleration of the motor vehicle and the use of this program of action for the longitudinal control of the motor vehicle, sai...

AI Technical Summary

Problems solved by technology

[0008] The problem with the design according to DE 10 2014 002 111 A1 is that the coasting assistance described in this way can only be operated at low speeds above about 20 km / h, because below this speed the idling or dragging mode must end and the creep controller, especially in automatic transmissions, regulates the active drive torque again

Furthermore, the reliable determination of the coasting target at which the vehicle should be stopped is not described there.

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