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A rear-steering control method for a four-wheel steering truck has been developed. The purpose of this investigation is to develop a control method to minimize the turning radius without the excursion of the vehicle rear end toward the outside of the turn. The basic control concept is to steer the rear wheels so that the vehicle rear end follows the path of the front end. The control method was applied to an experimental medium-duty truck with four-wheel steering system. The simulation and vehicle test results showed the control method to be effective in minimizing the turning radius without causing the excursion of the vehicle rear end toward the outside in short turns.

This paper describes a shaking vibration suppression approach for electric vehicles to support their quick and smooth acceleration response. Applied to the Nissan LEAF that has been specifically designed as a mass-market EV, the shaking vibration control system achieves a balance between highly responsive acceleration obtained with the electric drive motor, producing maximum torque of 280 Nm and maximum power of 80 kW, and a comfortable ride. A vehicle powered by an electric motor can provide quick acceleration response, thanks to the motor's fast torque response. However, the fast rate of increase in motor torque causes an uncomfortable shaking vibration that originates in the torsional torque of the drive shaft. The unique shaking vibration control system has been developed to achieve a balance between vehicle acceleration performance and ride comfort. Driving test results have confirmed that highly responsive acceleration is obtained without any shaking vibration.