Abstract
More than 25% of vehicle kinetic energy can be recycled under urban driving cycles. A single-pedal control strategy for regenerative braking is proposed to further enhance energy efficiency. Acceleration and deceleration are controlled by a single pedal, which alleviates driving intensity and prompts energy recovery. Regenerative braking is theoretically analyzed based on the construction of the single-pedal system, vehicle braking dynamics, and energy conservation law. The single-pedal control strategy is developed by considering daily driving conditions, and a single-pedal simulation model is established. Typical driving cycles are simulated to verify the effectiveness of the single-pedal control strategy. A dynamometer test is conducted to confirm the validity of the simulation model. Results show that using the single-pedal control strategy for electric vehicles can effectively improve the energy recovery rate and extend the driving range under the premise of ensuring safety while braking. The study lays a technical foundation for the optimization of regenerative braking systems and development of single-pedal control systems, which are conducive to the promotion and popularization of electric vehicles.
Highlights
Vehicles have provided convenience to humans, Received April 17, 2019; accepted May 21, 2019✉ Wei LIU, Xintian LIU ( ), Yansong WANGHongzhong QI Automotive Engineering Institute, Guangzhou Automobile Group Co
The energy recovery capability is analyzed theoretically according to the construction of the single-pedal system, vehicle braking dynamics, and law of energy conservation
Conventional braking conditions and urban driving cycles are selected for the simulation, and a dynamometer test is conducted for verification
Summary
Vehicles have provided convenience to humans, Received April 17, 2019; accepted May 21, 2019. Deceleration can be achieved by releasing the accelerator pedal, and the single pedal can carry out almost all of driving and braking as long as the driver maintains appropriate operation [9]. Another example is the Nissan Leaf, which features an e-pedal button. The latest EVs, such as Geely Emgrand EV450, BAIC EU5, and JAC iEVA50, are equipped with the single-pedal control system This system cannot completely replace the conventional brake pedal because mechanical braking is still necessary during emergencies.
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