Mechanism of Cone Wedge Shape Based Electronic Wedge Brake: Model and Experimental Validation

Abstract

This paper describes a new design of an electronic wedge brake (EWB) system called the Cone Wedge Shape Based Electronic Wedge Brake (CW-EWB). The CW-EWB brake is made up of two cone wedges, one female and one male, stacked on top of each other. The CW-EWB is powered by the linear movement of a roller screw caused by the rotation of an electric motor through the roller screw, which causes the lower wedge to move tangentially to the disc brake, creating braking torque as the wheel rotates. A dynamic model of the CW-EWB that creates braking torque was built in this study, utilising a physical parametric estimate method. A torque tracking controller based on the proportional integral derivative (PID) control scheme is presented to ensure the CW-EWB model performs properly. The resulting mathematical model and control method were then experimentally tested using a braking test rig outfitted with multiple sensors and input-output (IO) devices. The performance of the brake mechanism is analysed in terms of actuator voltage, current, wedge position, wheel speed, and brake torque. Consequently, comparisons are made between experimental outcomes and simulated model responses. There are comparable trends between simulation results and experimental data, with an acceptable level of error.