Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2018
Date : August 28, 2018 - August 31, 2018
Antilock braking system (ABS) is used to control the damping force of a brake to prevent from locking. ABS based on a digital PID control law is most popular. However, the effectiveness of ABS is strongly dependent on the friction characteristic between a tire and a road surface. This characteristic changes every moment, while a vehicle moves. Therefore, the practical applicability of the conventional ABS is low. In this paper, a new ABS based on an accelerometer is proposed. First, both vehicle and wheel velocity are acquired in real time and a slip ratio is continuously calculated from these data. Second, the maximum value of accelerometer within a definite period of time is calculated, this slip ratio obtained at this moment is defined as a reference value of a slip ratio. Finally, a vehicle is controlled by the conventional PID control so that this reference value of a slip ratio is kept. The reference value changes with time. Simulation results show that the effectiveness of the proposed ABS with PID control is verified; since the stopping distance becomes shorter than the case of a conventional ABS. Therefore, the proposed method is easily implemented due to simple architecture and low cost.
