Abstract
This paper introduces a case study on the potential of new mechatronic chassis systems for battery electric vehicles, in this case a brake-by-wire (BBW) system and in-wheel propulsion on the rear axle combined with an integrated chassis control providing common safety features like anti-lock braking system (ABS), and enhanced functionalities, like torque blending. The presented controller was intended to also show the potential of continuous control strategies with regard to active safety, vehicle stability and driving comfort. Therefore, an integral sliding mode (ISM) and proportional integral (PI) control were used for wheel slip control (WSC) and benchmarked against each other and against classical used rule-based approach. The controller was realized in MatLab/Simulink and tested under real-time conditions in IPG CarMaker simulation environment for experimentally validated models of the target vehicle and its systems. The controller also contains robust observers for estimation of non-measurable vehicle states and parameters e.g., vehicle mass or road grade, which can have a significant influence on control performance and vehicle safety.
Highlights
To realize such blended operation, the friction brake system should preferably have a decoupled architecture, where the connection between the driver and brake callipers is realized through the brake pedal simulator, and the callipers can be individually controlled with precisely metered clamping force
−with m gunknown sin χ parameter θ (see Equation (4)) and Considering that the linear system coefficient matrix X can be solved for every time step k via a discrete recursive least squares algorithm (RLSA), vehicle mass estimation is set to y = [F − F ], X = a and θ = m, while the RLSA problem for road slope contains y = [a
We should note that active deactivated control seemed to be advantageous in ride comfort, but it failed in terms torque blending can remarkably influence vehicle safety too, but in the case of emergency of vehicle stability as the blocked wheels did not guarantee a sufficient transmission of braking maneuver, the brake torque should be applied fully to the Electrohydraulic brakes (EHBs) on the front and lateral forces
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. One of the most attractive and challenging features of EVs with in-wheel propulsion is the possibility of blended operation of the friction brake system and the regenerative brake system (represented by IWMs working in a generator mode) that can essentially improve energy efficiency, fail-safety, and motion control performance in critical driving situations. BBW design should pay proper attention to the clamping force control and to the brake blending procedures to address efficient and reliable joint operation of electric motors and friction brakes In this regard various studies propose to use variable structure control [18], sliding mode control with switching compensation [19], optimal predictive control [20], and fuzzy logic [20,21]. The sections of the paper outline the system architecture, the main elements of the controller design, and validation of the system in the real-time model-in-the-loop environment
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
