Abstract
Nowadays, hybrid electric vehicle (HEV) is a popularly vehicle due to its advances such as reducing fossil fuel consumption and emissions that affect on environment. Brake energy regeneration system is essential part in HEV and electric vehicle. It assists HEV in reducing fuel consumption and pollution emission. Regenerative braking system aims to discard heat energy from mechanical braking as vehicle decelerated. Therefore, design and develop a suitable regenerative braking system were always intended. The braking control strategies were variation and improvement. The mechanical – electric braking system was utilized. This braking system must achieve the criteria such as safety, stability, maximum energy recovery and the shortest the braking distance. This paper proposed a control strategy for this hybrid braking system. Firstly, braking performances were satisfied by braking torque distribution strategy between front and rear axles. Secondly, maximum energy recovery was computed by compromising between mechanical and electric braking torque. Two issues were implemented by applying fuzzy logic and rule-based to design the braking torque controllers. Two controllers were estimated through the results of simulation in power-split HEV. The controller, applied fuzzy-based, had significant improvements in fuel consumption compare with another one. In addition, this controller was more flexible in various driving conditions.
Highlights
Research and development of hybrid electric vehicle (HEV) has become popular around the world, due to compromise advantage solutions between conventional and electric vehicle, and overcome their restraints
The braking control was focused on the maximum regenerative braking, and the regenerative braking demand was controlled by several factors, which included vehicle speed, braking torque demand of driver, and battery’s SOC
The ratio was very high; it means the braking controller recovered most of energy during braking
Summary
Research and development of hybrid electric vehicle (HEV) has become popular around the world, due to compromise advantage solutions between conventional and electric vehicle, and overcome their restraints. A significant amount of energy is consumed in urban driving cycles during [1, 2]. To improve the energy-saving, the HEV which combines mechanical and electric braking systems is applied. Researches indicated that additional energy recycling is achieved from 8% to 25% of total energy use of vehicle, depend on the driving cycle and its control strategies [3, 4]. A study about regenerative braking to improve performances, efficiency and reliability at minimal additional cost for hybrid vehicle [5] and the regenerative braking system of the Hybrid Electric Vehicle (HEV) is a key technology that can improve fuel efficiency by 20∼50%, depending on motor size [6]
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