Steer Control of Motorcycle by Power Steering Takayuki Koizumi, Nobutaka Tsujichi, Tetsuaki Takemura Department of Engineering, Doshisha University, 1-3, Tataramiyakodani, Kyotanabe-city, Kyoto, 610-0321, Japan ABSTRACT The introduction of the power steering will be thought also the motorcycle in the future. It is because of an increase of a large-scale motorcycle in recent years and the possibility for rider's supplementary role by an electric motor. In this research, the authors do the experiment that uses the motorcycle, and examine the steering wheel torque characteristic when the corner running for the electric power steering system. Finally, experimental results indicated that steering torques from the rider are similar at the low speed. It means there are possibility to construct the power steering system for the motorcycles at low speed. Introduction Recently, the motorcycle has enlarged because of the exhaust emissions regulations and the performance. The number of riders in his/her teens decreases, and the number of riders in his/her fifties has increased. The average age of the rider is as a whole 42.7 years old in Japan. The change is seen in maker's lineup as the rider ages, and the motorcycle also has the possibility that the steering wheel assistance function is introduced in the future. As for the steering wheel system of the four-wheeled vehicle, a steer-by-wire system is adopted now[1]. This system controls the angle of the tire with the motor and the steering wheel and the tire are not mechanically connected. However, in case of the motorcycle, from the problem of weight, the possibility that an electric power steering by an electric motor is introduced is high. Therefore, we construct the power steering system equipped with the DC motor in an ordinary steering wheel in the present study. In thisstudy, the authors examined the steering torque at the only low speed, because of the occasion of the experimental location and safety. 1. Composition of power steering Figure 1 shows the composition of the power steering. At first, when the rider turns the steering wheel to changes the traveling direction, the torque sensor and the rotary encoder detect the torque that the rider gave and the direction of the rotation and the rotational speed of the steering wheel. And the speed sensor installed in the body detects the vehicle speed. These values are sent to the controller, and the control signal is sent from the controller to the motor driver. Afterwards, the DC motor is rotated by a specified rotational speed, and the tire is steered through the gear. In this study, we use the warp gauge installed in the steering wheel as a torque sensor. T. Proulx (ed.), Modal Analysis Topics, Volume 3, Conference Proceedings of the Society for Experimental Mechanics Series 6, 491 DOI 10.1007/978-1-4419-9299-4_40, © The Society for Experimental Mechanics, Inc. 2011
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