Abstract
Abstract The Electric Disconnect Differential (EDD) is a kind of newly developed mechanism in powertrain proposed to improve the driving range of electric vehicles. The EDD is ingeniously designed to integrate the dog clutch based on the ordinary bevel gear differential. Through the engagement and disengagement process of dog clutch, the torque transmission of electric axle can be decoupled. Therefore, the on-demand 4WD control based on EDD can be realized by controlling the action of the dog clutch. A double-chamfered dog clutch model and a dynamic model of driveline containing EDD are established in this paper. To improve the performance of front-wheel drive vehicles in accelerating and overtaking, an EDD-based on-demand 4WD control strategy of electric vehicles is proposed. Simulation results indicate that the on-demand 4WD control algorithm can achieve clutch engagement within 100ms. More importantly, electric vehicles equipped with EDD on the front and rear drive axles can improve the trafficability and acceleration performance through the on-demand 4WD control strategy.
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