Patent ID: 8235867
Filing Date: 2012-08-07
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. A method of operating a drivetrain of a motor vehicle in which the drivetrain comprises a drive aggregate with at least one electric machine such that a nominal speed value is compared with an actual speed value and, on a basis of a difference between the nominal and the actual speed values, a crawling torque is produced as a control output, the method comprising the steps of: operating the drivetrain in a speed-regulated crawling mode when an accelerator pedal and brake pedal are not actuated; regulating torque produced by the electric machine of the drivetrain, during a purely electrical speed-regulated crawling operation, such that the actual speed value approximates the nominal speed value, when a positive crawling torque is required as the control output; and discharging an electrical energy accumulator of the drivetrain by operation of the electric machine as a motor.