Method and driving dynamics system for controlling a starting process of a vehicle

A driving dynamics system for controlling or regulating a movement starting process of a vehicle before adhesion of a driven wheel of the vehicle begins to decrease, the driving dynamics system comprising:

• wheel speed sensors configured to output wheel speed signals corresponding to driven wheels of the vehicle,
• a driving dynamics controller configured to receive a gas pedal signal and the wheel speed signals and configured to output request signals to a drive unit of the vehicle,
• wherein the driving dynamics controller is configured to:
• activate a control sequence and set a control sequence signal before adhesion of the driven wheel of the vehicle begins to decrease with increased slip, and defining a limit adhesion value corresponding to an adhesion value on an adhesion value-slip curve for the driven wheel before the driven wheel's adhesion decreases with increasing slip;
• define a maximum engine drive torque that is less than a maximum engine drive torque when the control sequence is deactivated;
• detect a drive request for the movement starting process, and in response to the drive request, carry out the following steps before adhesion of the driven wheel of the vehicle begins to decrease:
• control a clutch-gearbox unit with an engagement process duration greater than a standard engagement process duration provided for when the control sequence is deactivated,
• control a wheel slip value of the driven wheel based on the wheel speed of the driven wheel and at least set an output drive torque at the output shaft, and
• redefine the maximum engine drive torque depending on the wheel slip value and a driving speed;
• and
• deactivate the control sequence and reset the control sequence signal when a maximum value of a driving force applied to a road by the driven wheel and a limit adhesion value are reached, such that the driving force applied to the road by the driven wheel does not decrease with increased driving speed with increased driving speed during the control sequence,
• wherein the driving dynamics controller is configured to output an ATC request signal to a brake control device.

A method for controlling a movement starting process of a vehicle before adhesion of a driven wheel of the vehicle begins to decrease, the method comprising:

• a) activating a control sequence and setting a control sequence signal and defining a limit adhesion value, the limit adhesion value corresponding to an adhesion value on an adhesion value-slip curve for the driven wheel before the driven wheel's adhesion decreases with increasing slip;
• b) defining a maximum engine drive torque that is less than a maximum engine drive torque when the control sequence is deactivated;
• c) detecting a drive request for the movement starting process, and in response to the drive request, carrying out the following steps before adhesion of the driven wheel of the vehicle begins to decrease:
• c1) controlling a clutch-gearbox unit with an engagement process duration greater than a standard engagement process duration provided for when the control sequence is deactivated,
• c2) controlling a wheel slip value of the driven wheel by determining wheel speeds of the driven wheel and non-driven wheels and at least setting an output drive torque at the output shaft, wherein setting the output drive torque includes controlling at least the clutch-gearbox unit by engaging a clutch with a ramp function dependent on time or the wheel speeds of the driven wheels and
• c3) redefining the maximum engine drive torque depending on the wheel slip value and a driving speed;
• and
• d) deactivating the control sequence and resetting the control sequence signal when a maximum value of a driving force applied to a road by the driven wheel and the limit adhesion value are reached, such that the driving force applied to the road by the driven wheel does not decrease with increased driving speed during the control sequence.