A Study on Braking Force Distribution Method for 4-Wheel-Independent-Drive Electric Vehicle

This paper describes a new electronic brake distribution(EBD) method for electric vehicles with a four-wheel independent-drive motor. The proposed EBD logic consists of an FF(Feedforward) control part based on the vertical force ratio of each wheel for the braking stability of a vehicle, and an FB(Feedback) control part to secure robustness against load weight changes. In addition, a new brake force distribution logic toward regenerative braking and hydraulic friction braking was proposed, which was designed to allow easy transition between the maximum recuperation strategy and the braking stability maximization strategy. Simulation tests were conducted to investigate the feasibility and performance of the proposed control on a dry asphalt road. The results show that the EBD logic effectively maintains braking stability and robustness against load changes.