Accurate Pressure Control Based on Driver Braking Intention Identification for a Novel Integrated Braking System

Abstract

<div class="section abstract"><div class="htmlview paragraph">With the development of intelligent and electric vehicles, higher requirements are put forward for the active braking and regenerative braking ability of the braking system. The traditional braking system equipped with vacuum booster has difficulty meeting the demand, therefore it has gradually been replaced by the integrated braking system. In this paper, a novel Integrated Braking System (IBS) is presented, which mainly contains a pedal feel simulator, a permanent magnet synchronous motor (PMSM), a series of transmission mechanisms, and the hydraulic control unit. As an integrative system of mechanics-electronics-hydraulics, the IBS has complex nonlinear characteristics, which challenge the accurate pressure control. Furthermore, it is a completely decoupled braking system, the pedal force doesn’t participate in pressure-building, so it is necessary to precisely identify driver’s braking intention. To improve the control accuracy of the system, this paper proposed a novel pressure control strategy based on driver braking intention identification. Firstly, the structure and working principle of the novel integrated braking system was introduced. Secondly, the driver's braking intention identification strategy was designed. Thirdly, Considering the nonlinear and dynamic characteristics of the system, a cascade closed-loop control strategy including a pressure loop by the feedforward-feedback method, a position loop by the sliding-mode control method, and current loop with friction compensation was proposed. Finally, based on dSPACE products, a hardware-in-the-loop (HiL) experimental bench was built for algorithm verification. The HiL experiment results show that the pressure control strategy has the advantages of accurate response, the braking system pressure follows the driver's expected pressure well.</div></div>

Impact of the Choice of Available Brake Discs and Brake Pads at Different Prices on Selected Vehicle Features

“…Most likely, the fact that the vehicle used for measurements was equipped with the brake assistance system, known as BAS or EBA, contributed to the reduction in differences in braking characteristics between particular brake components [114,115]. Brake assistance system, BAS, or emergency brake assistant, EBA, recognise emergency braking according to how fast the acceleration pedal or brake pedal are applied and activate the maximum braking effect irrespective of the force applied by the driver on the brake [116][117][118]. The anti-block system (ABS) could also have reduced the differences [119,120].…”

A Review of One-Box Electro-Hydraulic Braking System: Architecture, Control, and Application

“…Pressure-position switch control [32,45] Pressure-position [36][37][38][46][47][48][49][50] Pressure-position-speed [35] Others Sliding mode control [51] RBF neuro network [52] Friction compensation…”

Research on characteristic parameter selection and attention-GRU-based model for braking intention identification

“…Nine hundred groups of braking data at the pedal pressing stage were randomly selected as the training set, and the other 330 groups were used as the testing set. In order to avoid the influence of different dimensions of input variables on the identification accuracy and improve the convergence speed during model training, the input data of the Attention-GRU model is Min-Max normalized according to equation (12). In addition, labels with different braking intentions are converted to one-hot coding.…”

“…First, brake-by-wire system (BBW) control. [12][13][14] BBW is a fully decoupled braking system, which cancels the mechanical connection between the brake pedal and the brake actuator. Because of its rapid response, flexible control, and easy integration of ABS (Anti-lock braking system), TCS (Traction control system), and ESC (Electronic stability control), BBW is regarded as the final solution for the future braking system.…”