Abstract
This paper describes a driving torque distribution method for front–and-rear-wheel-independent-drivetype electric vehicles (FRID EVs) in which it is possible to get stable steering on a low friction coefficient road surface. This method is characterized by distributing driving torque to the left and right wheels of the front and rear wheels, considering not only load movement of the longitudinal direction but also load movement of the lateral direction which is generated at cornering. The load movements are estimated by detecting components of the 3-axis directions, i.e., longitudinal and lateral accelerations and yaw rate, and the steering angle and friction coefficient μ of the road surface. The effectiveness of the proposed driving torque distribution method was verified using simulators equivalent to the prototype FRID EV simulated with Matlab/Simulink and CarSim software. This method is expected to be indispensable to improving running performance of FRID EVs.
Highlights
Electric vehicles (EVs) are becoming important as an environmental measure against global warming, and as an industrial policy [1]
On the other hand, when the proposed driving torque distribution method is applied, lateral forces required for revolution are secured by decreasing the front and rear motor torques in accordance with increase in speeds, and the turn to the left can be effectively carried out to bring the vehicle to the final destination
When cornering on low P-roads or at high speeds, it is very difficult for all conventional vehicles to perform steering for revolution
Summary
Electric vehicles (EVs) are becoming important as an environmental measure against global warming, and as an industrial policy [1]. After proposing front and rear wheel independent drive type electric vehicles FRID EVs (Fig. 2) compatible in safety and running performance [9], their research is being done from various angles by positioning them as a next-generation EV. It has been clarified through vehicle dynamics analysis experiments that outstanding running performance is obtained using a structural feature which can freely control longitudinal force of the front and rear wheels according to the running and road surface conditions [10]. MM (a) Front or rear wheel drive type EV (b) Front or rear two in-wheel drive type EV (c) Four inwheel drive type EV
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