Abstract
This paper proposed an electromechanical coupling approach based on sliding mode control (SMC) for traction control systems (TCS) of distributed drive electric vehicles (DDEVs). Since all wheel torque can be controlled continuously and independently, the TCS could be precisely applied on DDEVs. However, normal TCS would cause the waste of motor torque and road adhesion on the special working conditions. To solve this problem, the SMC was utilized based on the optimal slip rate calculated by road adhesion condition recognition and the electromechanical coupling (EC) approach was proposed to deliver part of torque from the motor of the higher speed. Simulation results based on dSPACE simulator showed that the proposed strategy can improved the dynamic performance and passability of the DDEVs.
Highlights
With the increasing environmental pollution and road safety, the distributed drive electric vehicles (DDEVs) have ignited wide-spread interest because of the ability to reduce pollution and make driving safer [1]
The effectbased method is an indirect estimation method, which estimated the current road adhesion condition by measuring the parameters of vehicle motion state changes caused by the change of road adhesion coefficient
This method is low-cost and easy to realize due to the characteristic of DDEVs and has been widely used in society
Summary
With the increasing environmental pollution and road safety, the DDEVs have ignited wide-spread interest because of the ability to reduce pollution and make driving safer [1]. TCS mainly involve two aspects of research: road adhesion condition recognition and torque control strategies. The former can be divided into two categories: cause-based and effect-based [2]. The effectbased method is an indirect estimation method, which estimated the current road adhesion condition by measuring the parameters of vehicle motion state changes caused by the change of road adhesion coefficient. This method is low-cost and easy to realize due to the characteristic of DDEVs and has been widely used in society. Assuming that there was no steering operation, and the difference of ground forces on the left and right wheels can be ignored when driving straight, the simplified 1/4 vehicle model is obtained as Fig.
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