Electro-hydraulic Brake Control for Improved Ride Comfort in Four-wheel-independently-actuated Electric Vehicles

doi:10.3901/JME.2020.24.125

Abstract

Abstract: The time domain response difference between the hydraulic and the electric brake often causes shocks during the brake mode switching process in between for electric vehicles (EVs), which would significantly compromise ride comfort. A ride-comfort-enabled strategy that consists of an upper and a lower controller is proposed for electro-hydraulic-combined brake system in a four-wheel-independently-actuated electric vehicle (FWIA EV). In the upper controller, a wheel cylinder pressure control strategy based on fuzzy control is proposed for an electro-hydraulic brake system (EHB) composed of a high-pressure accumulator and a motor pump. In order to tackle with the impact caused by brake mode switching, a ride-comfort-enabled strategy is proposed in the lower layer. It incorporates a hydraulic intervention prediction module and an electric brake compensation module. Finally, the proposed strategy is examined under various brake scenarios in Simulink-AMESim joint simulation. The results show that the wheel cylinder pressure can precisely track the target pressure with a steady-state error of less than 2% under different brake demands. The brake response is guaranteed and the impact during the brake mode switching process is significantly reduced under the proposed control strategy, thus achieving improved brake performance and ride comfort.

Key words: electro-hydraulic brake, wheel cylinder pressure control, fuzzy control, ride-comfort-enabled strategy

CLC Number:

TG156

ZHANG Lei, LIU Qingsong, WANG Zhenpo. Electro-hydraulic Brake Control for Improved Ride Comfort in Four-wheel-independently-actuated Electric Vehicles[J]. Journal of Mechanical Engineering, 2020, 56(24): 125-134.

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