한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)
- 제14권8호
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- Pages.146-154
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- 1997
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
PWM 제어에 의한 솔레노이드-유량제어방식 ABS의 제동압력 특성
Braking Pressure Characteristics of Solenoid-Flow Control Type ABS by PWM Control
- 송창섭 (한양대학교 공과대학 정밀기계공학과) ;
- 양해정 (한국산업기술대학교 기계설계학과)
- Song, Chang-Seop ;
- Yang, Hae-Jeong
- 발행 : 1997.08.01
초록
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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