고주파수 PWM제어를 이용한 ABS의 맥동 저감에 관한 연구

A Study on Falling Pressure Surge of ABS Using High Frequency PWM Control

  • 이용주 (두원공과대학 자동차과) ;
  • 김병우 (자동차부품연구원 전장개발부) ;
  • 박호 (천안공업대학 자동차과)
  • 발행 : 2003.06.01

초록

The solenoid valve in ABS hydraulic modulator is a two directional on-off valve and is controlled by around 100Hz high speed pulse width modulation. When the valve is switched from open state to closed state, noise and vibration due to pressure surge phenomena in the hydraulic line and wheel cylinder are made. In this study, we identify Pressure surge phenomenon in the braking process of a ABS, and investigate the way to reduce the phenomenon. For the purpose of theoretical analysis on the pressure surge in the closed state hydraulic line, characteristic curve method based on wave equation was utilized. To reduce the surge, high frequency control of 20kHz was attempted. The result showed that the surge pressure of 50% was reduced compared to one observed in the low frequency control. Duty variation of high frequency can control current of solenoid valve and prevent sudden change of displacement.

키워드

참고문헌

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