A dynamic model of electronic wedge brake: experimental, control and optimization

Abstract

This paper discusses the process of modelling and parameter selection for the creation of the electronic wedge brake system (EWB). The system involves a permanent magnet DC engine (PMDC) that drives the motor, the gear leadscrew and the brake core. The proposed model is simpler and more flexible which can be used in both the most well-known EWB designs either natural or optimized EWB. The selection of the motor is rendered according to the brake specifications. The wedge angle profile is centred on the derivation of EWB system that consists of brake actuator, wedge mechanism dynamic and wedge characteristic brake factor. Control and optimization are carried out with specific coefficients of friction of the brake pads to maintain operating reliability. A 5th-order brake simulation model of the EWB in a single state-space was derived and a simulation was conducted to verify the distribution of force. The efficiency of the brake clamping force control system was assessed by proportional-integral-derivative (PID) control. The performance of the proposed controller is verified in simulations and experiments using a prototype electronic wedge brake. The research findings indicate, the actuator restriction is deemed to achieve consistent performance against full range braking during the EWB control design.

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

“…the simulation results closely match the response of the real EWB system with less than 5% error. On the other hand, these data reveal that the operation of the EWB requires only 12 V, which verifies prior studies [7,31,45,49,52]. Moreover, the performance of the EWB is tested by observing the behaviour of the drive motor current, as shown in graphs (d) of Figures 12 to 15.…”

“…The works of [3,6,28,41] were followed in order to select an appropriate wedge angle profile. Figure 3 depicts the body diagram of an EWB wedge mechanism, which is based on [12,42]. Note that α is the wedges angle, Fm is the motor force, Fc is the clamping force between the disc and the brake pad, Fb is the stopping force generated from the relative motion between the pad and the disc surface, and Fr is the wedge friction force that occurs between the upper and lower wedges.…”

Simplifying the electronic wedge brake system model through model order reduction techniques

“…Due to the different types of actuation designs will have different model structures, the first flexible version of the EWB model is introduced, which can be used for two famous EWB designs based on tangential and optimised actuation angles [23]. The new generalised model is more compact and simpler than the various versions of EWB while retaining model accuracy.…”

“…Nonetheless, no further research is done to see what happens if not all these variables are considered. Based on these three factors, we performed 2 cases based on our EWB parameters and realised that the number of factors that can be ignored depends on EWB design parameters [29]. Motivated by this result, we have expanded our study to several cases, as in this article and provided detailed derivation and assumptions.…”

“…Based on our EWB design, further analysis is made to evaluate each model accuracy, with the flexible, 5 th order linear model being used as a benchmark. All the symbols and parameters used in this paper are based on previous work reported in [23].…”