Creation of electric vehicle ABS operation algorithm with possibility of hybrid braking based on slip-slope approach at wheels slip determining

• Published in: IOP conference series. Materials Science and Engineering 2019-05, Vol.534 (1), p.12034
• Main Authors: Bakhmutov, S, Umnitsyn, A, Ivanov, V
• Format: Article
• Language: English
• Subjects: Algorithms; Antilock braking systems; Coefficient of friction; Deceleration; Electric motors; Electric vehicles; Friction; Regeneration; Road maintenance; Slip; Tires; Torque; Vehicle wheels
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/534/1/012034

This paper represents an Anti-lock Braking System (ABS) operation algorithm implementing hybrid braking; the paper considers braking with a high deceleration of an electric passenger vehicle during the rectilinear driving on the roads with different friction coefficients; a short analysis of the approaches used for evaluation of the target vehicle wheels slip is also performed. The main ABS task consists in maintenance of the target wheel slip coefficient based on the tyre-road friction coefficient. The tyre-road friction coefficient φx is determined using the algorithm proposed in the papers by Semmler. The algorithm is about finding the curve peak φx−S using the least square method. Based on the calculated target slip coefficient, the braking torque at the electric motor shaft operating in the regeneration mode is determined. The electric motor ensures relatively low braking torque at the vehicle wheels preventing the tyres from a significant slip. Reaching the target slip coefficient is ensured by means of friction brake mechanisms. Virtual tests showed that the values of the wheel slip coefficient are close to the required ones. Thus, this system makes it possible to implement hybrid braking with two sources creating the brake torque.