전기기계식제동장치의 힘센서 보상을 이용한 제어방법의 성능평가

초록

Pneumatic brakes, which are mainly used in railway vehicles, apply a braking force to railway vehicles through an open loop control of a predetermined pneumatic pressure according to each braking step. Recently, with the appearance of electromechanical braking devices, a control method of an electric motor to replace the function of an existing pneumatic actuator has been studied. Complicated control is required because the braking operation using the motor is performed in the stall state of the motor. In particular, pressure estimation control is mainly used because the sensor installation is difficult due to the temperature rise of the friction surface of the brake disc. On the other hand, to accurately control the clamping force according to the change of the friction surface and the hysteresis characteristics of the motor, it is necessary to consider the installation of a force sensor. In this paper, instead of measuring the clamping force applied to the friction surface of the brake disc, a force sensor was installed in the brake pad bracket connection part of the caliper, and the sensor feedback signal was used together to compensate for the control of the existing position estimation control. The proposed method can increase the reliability of the braking system because it can be controlled through position estimation control when the clamping force sensor fails. The performance of EMB to which the proposed control method was applied was installed in the experimental jig, and the availability was evaluated through static control performance evaluation.

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