Patent ID: 8239107

Claim:
A method of starting control of a motor vehicle having a drive train comprising a drive engine being controlled automatically and by way of an accelerator pedal, an automated friction starting clutch, a transmission with variable gear ratios, and a service brake, which is configured as a pressure medium-actuated friction brake and controlled automatically by way of a brake pedal, in a starting mode of a starting assistance controller, which is actuatable when the vehicle is stationary, the drive engine is running, the starting clutch is disengaged, a gear ratio is set, and the service brake is actuated by way of the brake pedal, upon release of the brake pedal, the service brake initially remaining engaged by maintaining a brake pressure (p B ) previously set by the brake pedal, and upon a subsequent actuation of the accelerator pedal, an engine torque (M M ) of the driving engine being increased, clutch torque (M K ) of the starting clutch being increased by an engaging the starting clutch, and brake torque (M B ) of the service brake being reduced by lowering of the brake pressure (p B ), the method comprising the steps of: determining a braking torque (M B ) set by a driver using the brake pedal, an acceleration torque (M A ) requested by the driver by way of the accelerator pedal, and a holding torque (M H ) required for maintaining the motor vehicle on a gradient; coordinating the engagement of the starting clutch and release of the service brake such that during the release of the service brake, a sum of the clutch torque (M K ) and the braking torque (M B ) corresponds to the holding torque (M H ) (M K +M B =M H ), and the clutch torque (M K ) of the starting clutch is only increased by the acceleration torque (M A ) when the service brake has been largely released (M B =0); calculating a climbing resistance (F S ) with a roadway incline (α) and a vehicle weight (m F ); calculating a driving resistance (F W ) with the climbing resistance (F S ) and a determined rolling resistance (F R ); and calculating the holding torque (M H ) related to a plane of the starting clutch using the driving resistance (F W ), a radius (r R ) of drive wheels, and a ratio (i D ) of either an axle and a central differential, and a ratio (i G ) of the transmission.