Patent ID: 11897472
Assignee: AUDI AG
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  F | IPC B

Claim 0:
1. A method for controlling a drive motor in a motor vehicle, comprising:
determining driving situation information which describes a static friction and a frictional connection of at least one wheel of the motor vehicle with a road surface and a speed of the motor vehicle,
determining a minimum speed of the drive motor as a function of the driving situation information based on at least one traction-slip curve describing a relationship between wheel slip of the at least one wheel of the motor vehicle and an actual traction value for a specific driving condition based on weather conditions and the road surface, wherein the at least one traction-slip curve includes a maximum slip point below which the driving situation is considered stable and above which the driving situation is considered unstable;
monitoring, via a first speed sensor, an actual speed of an output shaft to determine a torque specification;
monitoring, via a second speed sensor, a wheel speed of the at least one wheel of the motor vehicle to calculate the wheel slip of the at least one wheel of the motor vehicle; and
regulating or controlling the speed of the drive motor based on the determined torque specification and the calculated wheel slip as a function of the minimum speed of the drive motor, such that the speed of the drive motor is always greater than the minimum speed and the maximum slip point is not exceeded, wherein the regulating or controlling switches between speed-based regulation or control to torque-based regulation or control after a current speed of the drive motor exceeds a specified multiple of the minimum speed of the drive motor.