Cooperative control of regenerative braking and friction braking for a hybrid electric vehicle

Abstract

In this paper, a rear-wheel-driven series hybrid electric vehicle which has a mechanically operated friction brake system is studied. A new cooperative control of regenerative braking and friction braking called 'combined braking' is proposed for this vehicle configuration. A mechanism to adjust the proportions of regenerative braking and friction braking was proposed in this paper. Further, the braking force distribution between the front wheels and the rear wheels was analysed to ensure stable braking. The brake system characteristics were considered to ensure that the driver's feel remains the same in the new proposed combined braking strategy. The simulation results under urban driving and across the Modified Indian Driving Cycle and vehicle road testing results show that the proposed combined braking can regenerate more than twice the braking energy of conventional parallel braking. Also, with combined braking, the braking force distribution between the front wheels and the rear wheels is closer to the ideal braking force distribution curve, which is desirable to ensure stable braking.

Evaluation of regenerative braking based on single-pedal control for electric vehicles

“…When the energy recovery level is selected, the regenerative braking strength is fixed. Typically, the regenerative braking torque is set small to ensure drivability, which leading to lower energy recovery rate [19,20]. By contrast, the single-pedal control strategy is relatively complicated but highly aligned with ergonomics.…”

A Braking Intention Identification Method Based on Data Mining for Electric Vehicles

“…With the increase of the braking urgency, mechanical friction braking gets involved gradually. In emergency braking process, only mechanical brake works to ensure the safety and reliability of the braking process [6][7][8][9][10].…”

A Control Algorithm for the Novel Regenerative–Mechanical Coupled Brake System with by-Wire Based on Multidisciplinary Design Optimization for an Electric Vehicle

“…During braking, if the braking force is distributed in the form of an I curve, any wheel locking in advance will be prevented, and the optimum braking stability will be obtained [10,24]. The ideal braking force distribution, which is the goal of optimum braking stability, can be expressed as follows:…”

“…Xiao presented an integrated control strategy to coordinate regenerative and friction braking forces to deal with the braking stability and recovery efficiency when a vehicle performed normal deceleration and emergency braking [3]. To regenerate more braking energy and move closer to the ideal braking force distribution curve, a combined braking control strategy was developed for the rear wheel-driven series hybrid electric EV to adjust the proportions of regenerative braking and friction braking [10]. A regenerative braking cooperative control strategy was proposed by Jiweon for hybrid EVs equipped with a hydraulic brake on the rear wheels and an electronic wedge brake on the front wheels [11].Optimization and control technologies have also been proposed to control the cooperative braking system.…”