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DFSS방법론을 사용한 RWS 원점복원 로직에 대한 연구
유승범(Sungbem Yoo),임희규(Heekyu Lim),백훈열(Hoonyeol Baek) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
The rear wheel steering system basically operates by external signal, receiving the steering angle and the vehicle speed input. If there is a problem with the external signal of the rear wheel steering, that will be able to change its state. One is immediate stop and the other is stop after move to neutral. In the case of stopping immediately, since it is fixed at a specific rear wheel angle, the front wheel angle must be rotated by the rear wheel angle in order to make a straight advance. However, if the vehicle moves to the neutral position, the driver will feel discomfort because yaw velocity is changed. It is necessary to decide how to set the time to reduce driver discomfort during traveling home. We used the Taguchi methodology of DFSS to derive the appropriate time without the driver’s discomfort.
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이정민(Jeongmin Lee),김우형(Woohyoung Kim),임희규(Heekyu Lim),김봉수(Bongsoo Kim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Vehicle steering technology, which is currently being mass produced, uses a steering column to steer the wheels with the linear motion of the OBJ connected to the carrier using a motor-driven actuator connected to the steering column or rack gearbox. In this method, the driver’s manual torque is directly connected to the vehicle’s wheel based on the reliability of the structural connection of the mechanical device. However, in order to implement the active steering technology in the future, SBW is necessary. With the development of various sensors, the new steering technology of the vehicle has developed into the active steering technology of the vehicle by using the sensor for processing software of the recognition information, and the decision subject of the steering has been moved from the person to the ECU. Therefore, Unnecessary time of driver’s operating has increased and the steering column will be a device that measures the steering angle and provides a reaction to the driver in some situations where driver intervention is required. In the present situation that the driver has to intervene in a certain level of steering prior to the fully autonomous driving, in order to make the driver feel the current level of steering feeling for the products driven by the communication using the wire, not only securing the performance of the actuator, A reaction force column device capable of generating a steering feel of the steering wheel by the driving condition is required. In the case of the reaction force device, the motor torque is varied for each vehicle speed only for the purpose of assisting the driver. At this time, the column torque (Nm) sensed by the driver is measured, and this torque will be the reaction force in SBW. The reaction torque of SBW can be variously designed according to the type of reducer and conditions of use. In this study, the SBW reaction system using the torque sensor is designed to provide the steering feeling to the driver by using the EPS logic which is used in the past. The basic logic of EPS, torque loop assist, damping control, restoration control, is tuned to the SBW and the rack pulling force damping logic is added for natural movement when the steering wheel is released.
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