Control Device for Operating a Road-Coupled All-Wheel Drive Vehicle

A control device for operating a road-coupled all-wheel drive vehicle, comprising:

• at least one electronic control unit;
• at least a first electric drive motor as a primary motor assigned to a primary axle;
• and
• at least a second electric drive motor as a secondary motor assigned to a secondary axle,
• wherein the control unit comprises a torque-limiting module which, upon detection of an expected change in an all-wheel drive factor (FAWD_target) on the basis of a defined signal (AP_raw) that precedes a filtered driver-input signal (AP_int), torque limits (T_target_1_limit, T_target_2_limit) for individual target torques (T_target_1, T_target_2) of the first and second electric drive motors are abruptly preset according to the predetermined changed all-wheel drive factor (FAWD_target) before the individual target torques (T_target_1, T_target_2) per se are set.

An electronic control unit, comprising:

• a torque-limiting module that:
• at least one electronic control unit;
• at least a first electric drive motor as a primary motor assigned to a primary axle;
• and
• at least a second electric drive motor as a secondary motor assigned to a secondary axle,
• wherein the control unit comprises a torque-limiting module which, upon detection of an expected change in an all-wheel drive factor (FAWD_should) on the basis of a defined signal (FP_roh) that precedes a filtered driver-input signal (FP_int), torque limits (M_should_1_limit, M_should_2_limit) for individual target torques (M_should_1, M_should_2) of the first and second electric drive motors are abruptly preset according to the predetermined changed all-wheel drive factor (FAWD_should) before the individual target torques (M_should_1, M_should_2) per se are set.

A computer product comprising a non-transitory computer readable medium having stored thereon program code that, when executed in the electronic control unit, carries out the acts of:

• at least one electronic control unit;
• at least a first electric drive motor as a primary motor assigned to a primary axle;
• and
• at least a second electric drive motor as a secondary motor assigned to a secondary axle,
• wherein the control unit comprises a torque-limiting module which, upon detection of an expected change in an all-wheel drive factor (FAWD_target) on the basis of a defined signal (AP_raw) that precedes a filtered driver-input signal (AP_int), torque limits (T_target_1_limit, T_target_2_limit) for individual target torques (T_target_1, T_target_2) of the first and second electric drive motors are abruptly preset according to the predetermined changed all-wheel drive factor (FAWD_target) before the individual target torques (T_target_1, T_target_2) per se are set.