Smart vehicle systems and control logic for active brake drag mitigation of electromechanical brake systems

A non-transient, computer-readable medium storing instructions executable by a vehicle controller of a motor vehicle with a brake-by-wire (BBW) brake system, the BBW brake system including a brake motor configured to drive a brake actuator to thereby press a friction brake element against a rotating brake element, the instructions, when executed, causing the vehicle controller to perform operations comprising:

• receiving vehicle dynamics data indicating the motor vehicle is traveling in a forward direction;
• receiving, responsive to the motor vehicle traveling in the forward direction, advanced driver assistance system (ADAS) data and driving torque request (DTR) data;
• determining if the ADAS data indicates an ADAS warning event is detected and if the DTR data indicates an acceleration torque request was received to accelerate the motor vehicle;
• and
• commanding the brake motor to drive the brake actuator and thereby change a running clearance (RC) between the friction brake element and the rotating brake element to a reduced RC distance in response to detection of the ADAS warning event or to a first increased RC distance in response to receiving the acceleration torque request to accelerate the motor vehicle.

A motor vehicle, comprising:

• a vehicle body;
• a plurality of road wheels attached to the vehicle body;
• a prime mover attached to the vehicle body and configured to drive at least one of the road wheels to thereby propel the motor vehicle;
• a brake-by-wire (BBW) brake system attached to the vehicle body and including multiple electromechanical brake (EMB) units each configured to slow a respective one of the road wheels, each of the EMB units including an electric servo motor configured to drive a ball-screw actuator (BSA) assembly and thereby push a brake piston into a brake pad such that the brake pad presses against a brake rotor mounted to rotate in unison with the respective one of the road wheels;
• and
• a vehicle controller programmed to:
• receive vehicle dynamics data indicating the motor vehicle is traveling in a forward direction;
• responsive to the motor vehicle traveling in the forward direction, receive advanced driver assistance system (ADAS) sensor data from a vehicle sensor array and driving torque request (DTR) data from a driver input device;
• determine if the ADAS sensor data indicates an ADAS warning event is detected and if the DTR data indicates an acceleration torque request was received to accelerate the motor vehicle;
• and
• command the electric servo motor to drive the BSA assembly and thereby change a running clearance (RC) between the brake pad and the brake rotor to a reduced RC distance in response to detection of the ADAS warning event or to a first increased RC distance in response to receiving the acceleration torque request to accelerate the motor vehicle.