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Numerical and Experimental Investigation of Compressible-Brake-Fluid Flow Characteristics and Brake-Bleeding Performance in EPB Caliper

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Abstract

This study investigates the compressible-brake-fluid flow characteristics within an electric parking brake (EPB) caliper during the bleeding cycles, subsequently determines the fundamental cause for reduction in brake-bleeding performance, and suggests a new design for its improvements. Three-dimensional simulation validation of the brake-fluid consumption curve is conducted through the parameter study of the air mass flow and bulk modulus. A numerical approach utilizing a three-phase (air, brake-fluid, and brake-fluid vapor) mixture model and a standard k-ω turbulence model is adopted to investigate the flow field details. Based on the unsteady simulation results and experimental verifications for the current and new models of the nut-spindle of a driving part in the EPB caliper, the primary cause for the reduction in the bleeding performance in the EPB caliper is determined to be the trapped air in the thread gap and in the space between the spindle and nut-spindle. Consequently, the head chamfer effect for the nut spindle is beneficial for removing trapped air and leads to performance improvement of 30.3 %.

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Abbreviations

k:

bulk modulus at pressure

K0 :

reference bulk modulus

N:

density exponent

p:

liquid pressure (absolute)

p0 :

reference liquid pressure (absolute)

\({\vec v_m}\) :

mass-averaged velocity

ρ:

liquid density at pressure

ρ0 :

reference liquid density

ρk :

density of phase k

ρm :

mixture density

αk :

volume fraction of phase k

\(\vec g\) :

gravity, 9.81 m/s2

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Acknowledgement

This work was supported by Mun-Seong Kim and Seung-Woo Han at the MBS R&D Center in the Mando Corporation.

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Authors and Affiliations

  1. Mando Global R&D Center, Mando Corporation, 21 Pangyo-ro 255beon-gil, Bundang-gu, Seongnam-si, Gyeonggi, 13486, Korea

    Jang-oh Mo

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  1. Jang-oh Mo
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Correspondence to Jang-oh Mo.

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Mo, Jo. Numerical and Experimental Investigation of Compressible-Brake-Fluid Flow Characteristics and Brake-Bleeding Performance in EPB Caliper. Int.J Automot. Technol. 22, 315–325 (2021). https://doi.org/10.1007/s12239-021-0030-6

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  • DOI: https://doi.org/10.1007/s12239-021-0030-6

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