Abstract
The electronic differential system (EDS) is an important issue for four-wheel drive electric vehicles. This paper delineates an advanced EDS steering strategy and carries out a careful study of its control performance by numerical simulations that comply with the requirements of ISO4238:2012. The results demonstrate that the EDS feedback gain plays an important role to its control performance, particularly to its steering characteristics. Moreover, the analysis and discussion disclose the mechanism of the relationship between the feedback gain and the steering characteristics, which will contribute to further research and EDS development.
Highlights
Most automotive differentials use limited slip differential (LSD) to turn a car
Cornering is a problem in LSD that can lead to vehicles not traveling in one direction and it, as shown in Figure 1, can be categorized into three types: under-steering, neutral-steering, and over-steering
In order for vehicles to travel in the original trajectory at any speed and not slip, we plan to employ a new electronic differential system (EDS) to improve the disadvantages of LSD
Summary
Most automotive differentials use limited slip differential (LSD) to turn a car. Under normal circumstances, LSD can follow the normal steering curvature at high speeds. The EDS aims to distribute the torque command to the left and right wheels for the required vehicle motion and orientation control. These two input commands are initiated so that we can pilot the vehicle for moving forward and orientation control via the steering wheel and pedal (i.e., two decoupling commands). In order for vehicles to travel in the original trajectory at any speed and not slip, we plan to employ a new EDS to improve the disadvantages of LSD. The designated torque output inhomogeneous, resulting in a slight slip during acceleration.
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