Torque Distribution Algorithm for an Independently Driven Electric Vehicle Using a Fuzzy Control Method: Driving Stability and Efficiency

The in-wheel electric vehicle is expected to be a popular next-generation vehicle because an in-wheel system can simplify the powertrain and improve driving performance. In addition, it also has an advantage in that it maximizes driving efficiency through independent torque control considering the motor efficiency. However, there is an instability problem if only the driving torque is controlled in consideration of only the motor efficiency. In this paper, integrated torque distribution strategies are proposed to overcome these problems. The control algorithm consists of various strategies for optimizing driving efficiency, satisfying driver demands, and considering tire slip and vehicle cornering. Fuzzy logic is used to determine the appropriate timing of intervention for each distribution strategy. A performance simulator for in-wheel electric vehicles was developed by using MATLAB/Simulink and CarSim to validate the control strategies. From simulation results under complex driving conditions, the proposed algorithm was verified to improve both the driving stability and fuel economy of the in-wheel vehicle.

[1]  Sung-Ho Hwang,et al.  Study of Driving Stability Performance of 2-Wheeled Independently Driven Vehicle Using Electric Corner Module , 2013 .

[2]  Qingnian Wang,et al.  Independent wheel torque control of 4WD electric vehicle for differential drive assisted steering , 2011 .

[3]  Junmin Wang,et al.  Development and performance characterization of an electric ground vehicle with independently actuated in-wheel motors , 2011 .

[4]  Dragan Aleksendric,et al.  Adaptive neuro-fuzzy wheel slip control , 2013, Expert Syst. Appl..

[5]  Languang Lu,et al.  Energy efficiency optimization of electric vehicle driven by in-wheel motors , 2013 .

[6]  Guoqing Xu,et al.  An Intelligent Regenerative Braking Strategy for Electric Vehicles , 2011 .

[7]  Yan Chen,et al.  Design and Experimental Evaluations on Energy Efficient Control Allocation Methods for Overactuated Electric Vehicles: Longitudinal Motion Case , 2014, IEEE/ASME Transactions on Mechatronics.

[8]  Hyeonwoo Song,et al.  Development of Power Distribution Algorithm for Driving Efficiency Optimization of Independently Driven Vehicle , 2014 .

[9]  Lotfi A. Zadeh,et al.  Fuzzy Sets , 1996, Inf. Control..

[10]  Yan Chen,et al.  Adaptive Energy-Efficient Control Allocation for Planar Motion Control of Over-Actuated Electric Ground Vehicles , 2014, IEEE Transactions on Control Systems Technology.

[11]  Pierre Sicard,et al.  Fuzzy-Sliding Mode Speed Control for Two Wheels Electric Vehicle Drive , 2009 .

[12]  T D Gillespie,et al.  Fundamentals of Vehicle Dynamics , 1992 .

[13]  Gang Xu,et al.  Driving and control of torque for direct-wheel-driven electric vehicle with motors in serial , 2011, Expert Syst. Appl..

[14]  Kada Hartani,et al.  A New Multimachine Robust Based Anti-skid Control System for High Performance Electric Vehicle , 2014 .

[15]  Kada Hartani,et al.  Sensorless Fuzzy Direct Torque Control for High Performance Electric Vehicle with Four In-Wheel Motors , 2013 .

[16]  H. Fujimoto,et al.  Motion control and road condition estimation of electric vehicles with two in-wheel motors , 2004, Proceedings of the 2004 IEEE International Conference on Control Applications, 2004..

[17]  Cheng Lin,et al.  A Traction Control Strategy with an Efficiency Model in a Distributed Driving Electric Vehicle , 2014, TheScientificWorldJournal.

[18]  Yoichi Hori,et al.  Future vehicle driven by electricity and Control-research on four-wheel-motored "UOT electric march II" , 2004, IEEE Transactions on Industrial Electronics.

[19]  Hans B. Pacejka,et al.  A New Tire Model with an Application in Vehicle Dynamics Studies , 1989 .

[20]  Yoichi Hori,et al.  Control Algorithm for an Independent Motor-Drive Vehicle , 2010, IEEE Transactions on Vehicular Technology.

[21]  Woong-Hee Shon,et al.  System Modeling and Simulation for an In-wheel Drive Type 6×6 Vehicle , 2011 .