Abstract
Both active safety and fuel economy are important issues for vehicles. This paper focuses on a traction control strategy with an efficiency model in a distributed driving electric vehicle. In emergency situation, a sliding mode control algorithm was employed to achieve antislip control through keeping the wheels' slip ratios below 20%. For general longitudinal driving cases, an efficiency model aiming at improving the fuel economy was built through an offline optimization stream within the two-dimensional design space composed of the acceleration pedal signal and the vehicle speed. The sliding mode control strategy for the joint roads and the efficiency model for the typical drive cycles were simulated. Simulation results show that the proposed driving control approach has the potential to apply to different road surfaces. It keeps the wheels' slip ratios within the stable zone and improves the fuel economy on the premise of tracking the driver's intention.
Highlights
To address the two urgent issues nowadays of protecting the environment and achieving energy sustainability, it is of strategic importance on a global scale to replace oildependent vehicles with electric vehicles (EVs) [1,2,3]
Compared with internal combustion engine vehicles, electric vehicles with motors have many fascinating advantages, such as the quicker and more accurate torque generation, the easier measurement of motor torque [4], which provide a broad prospect for the vehicle dynamics control
The switching condition is defined as the slip ratio exceeding 15%; that is, if the slip ratio is lower than 15%, it is at general driving case and efficiency model works; otherwise the sliding mode control algorithm will be activated to ensure the driving safety
Summary
Kim et al put forward a driving control algorithm for a 6WD/6WS vehicle equipped with 6 in-wheel motors to improve vehicle stability and maneuverability [15]. To improve the energy economy and the driving stability, the control strategy for the distributed driving electric vehicles is necessary and very important. In order to ensure the driving safety during the emergency case, we used the sliding mode control strategy to guarantee the wheel slip rate within the stable zone. Apart from this case, an efficiency model is implemented to reduce the energy consumption.
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