| Key Words |
ABS(미끄럼방지제동장치), Hydraulic unit(유압 장치), Wheel cylinder(차륜 실린더), Plunger(가동자), ABS modulator(ABS 모듈레이터), PWM(펄스폭변조), Solenoid valve(솔레노이드 밸브), Duty ratio(듀티 비율), Pressure su |
| 초록 |
The solenoid valve in ABS hydraulic,s modulator is a two directional on-off valve and is controlled by around 100Hz high speed pulse width modulation. When the inlet valve is switched from open state to closed state, there are braking force degration, noise and vibration due to pressure surge phenomena in the hydraulic line and wheel cylinder. In this study, identifies pressure surge phenomenon in the braking process of a ABS, and investigates the way to reduce the phenomenon. For the purpose theoretical analysis on the pressure surge in the closed state hydraulic line, characteristic curve method based on wave equation was utilized. During this analysis, we could find pressure surge characteristics change due to hydraulic line change and PWM control conditions. In conclusion, by using the results of this study for the pressure surge prediction and reduction method, we could expect braking performance enhancement in Anti-Lock Braking System. |
