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張珉碩(Minseok Jang),李英玉(Young Ok Lee),李元九(Wongoo Lee),李忠禹(Choong Woo Lee),孫榮涉(Youngsup Son),鄭正周(Chung Choo Chung) 대한전기학회 2008 전기학회논문지 Vol.57 No.12
Hall effect force sensors have been used to measure clamping force in conventional Electric Parking Brake (EPB) systems. Estimation of clamping force without the sensors has drawn attentions due to mounting space limitations and cost issues. Removing the sensor requires the estimation of the initial contact point where the clamping force is effectively applied to the brake pads. In this paper, we propose how to estimate the initial contact point finding the relation between the angular velocity of an actuator and the initial contact point. For force estimation a look-up table is used as a function of the displacement of parking cable from the initial contact point. The proposed method is validated by experiments. From the experimental results we observe that the proposed method satisfies the specifications. The designed method is also able to estimate clamping force although parking cables are loosened and brake pads are worn out. Applying the proposed method enables manufacturing of low cost EPB systems.