• Title/Summary/Keyword: Reapply rate

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Braking Pressure Characteristics of Solenoid-Flow Control Type ABS by PWM Control (PWM 제어에 의한 솔레노이드-유량제어방식 ABS의 제동압력 특성)

  • Song, Chang-Seop;Yang, Hae-Jeong
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.8
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    • pp.146-154
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    • 1997
  • Solenoid-folw control type ABS is used with a 'dump and reapply' pressure control arrangement instead of using 2/2 (normal open/close) solenoid valves in convensional systems(sol. -sol. control type), a flow control valve is used which replaces the (no) inlet valve. The flow control valve controls fluid flow providing a nearly constant reapply rate( .theta. ) after the dump plase of ABS operation. In this study, to investigate a characteristics of brake pressure by PWM control, test rig was consisted of ABS hydraulic modulator, digital controller, pneumatic power supply and brake master cylinder. For comparison with experi- mental results, system modelling and computer simulation were performed. As a result, experiment results showed fairly agreement with the simulation. Also, it is shown that the pressure gradient (tan .theta. ) is affected by pressure, frequency, duty ratio and expressed with an exponential funtion.

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