Method and device for controlling the traction slip of driven wheels of a vehicle with the engine rotational speed as manipulated variable

A device for controlling a traction slip of driven wheels of a vehicle, comprising:

• at least one control unit to determine a manipulated variable for a drive engine of the vehicle based on a detection of an instantaneous wheel speed and a determination of a desired wheel speed, the manipulated variable being formed by an upper limit value for the rotational speed of the drive engine;
• wherein the at least one control unit determines the instantaneous transmission ratio based on an instantaneous rotational speed of the drive engine and the instantaneous wheel speed, and determines the upper limit value for the rotational speed of the drive engine from the desired wheel speed and an instantaneous transmission ratio;
• wherein the manipulated variable is a rotational speed of the drive engine, and wherein the upper limit for the rotational speed is the limit at which the vehicle is operated in a stable region of an adherence-slip curve or at an adherence maximum, and
• wherein an engine control unit has a rotational speed controller that regulates the drive engine to the upper limit value for the rotational speed,
• wherein an engine control unit has a rotational speed controller that regulates the drive engine to the upper limit value for the rotational speed,
• wherein the instantaneous transmission ratio i_total is determined from the instantaneous wheel speeds of the driven wheels and the current engine rotational speed n_mot as follows:
• i_total=n_mot/((v_2l+v_2r)/2), where n_mot is the instantaneous engine rotational speed, and v_2r, v_2l are the instantaneous wheel speeds of the driven wheels of a driven axle, and
• wherein the desired wheel speed v_soll and the transmission ratio i_total are used to determine the upper limit value for the engine rotational speed n_mot_max, as follows:
• n_mot_max=v_soll*i_total.