The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Clamping Force Estimation Method in Electric Parking Brake Systems

전자 제어식 주차브레이크 시스템의 제동력 추정 기법

  • 장민석 (한양대 공대 전기공학과) ;
  • 이영옥 (한양대 공대 전기공학과) ;
  • 이원구 (한양대 공대 전기공학과) ;
  • 이충우 (한양대 공대 전자통신전파공학과) ;
  • 손영섭 ((주)만도 중앙연구소) ;
  • 정정주 (한양대 공대 전기제어생체공학부)
  • Published : 2008.12.01
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Abstract

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.

Keywords

References

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