| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 101 === Magneto - rheological fluid (MRF) is a new development of smart materials. It is studied and applied widely in the braking damping systems because of the controllable viscosity changes with applied magnetic field at almost linear relationship, reversible and fast response time and other characteristics.
Nowaday, control algorithm using in anti-lock braking system (ABS) is the same common method which is to use on-off control valve. The valve can be controlled by increasing the switching frequency to improve braking performance, but the method is limited by the system itself existing in hydraulic switching valve reaction time and frequency. Therefore, if an MR brake system with fast response time combines to a conventional braking system, It can effectively improve the braking performance and stability.
In this thesis, a hybrid ABS braking system using MR brake is proposed, Dynamic simulation and analysis were conducted. Speed estimator used in this study is continually estimated lateral speed which calculates vehicle slip values. Road Condition Estimation is used to obtain the best ideal slip value. ABS control using Self-Organizing Fuzzy controller with two kinds of fuzzy controller. The hybrid ABS brake system is composed of the hydraulic system and the MR brake system. The combination of the two systems was simulated and analyzed by dynamic analysis software for pure MR ABS braking system and hybrid ABS braking system using MR brake. The controller is divided into general fuzzy controller with two kinds of self-organizing fuzzy ABS controller. The results shows that self-organizing fuzzy controller provides high adaptability on the road while braking performance can be improved up to approximately 18%. Hybrid ABS systems using MR brake are divided into three types: fixed-oil -pressured hydraulic system, filter-typed system and switch-valve-typed system. The simulation results of those three systems show that the hybrid ABS system overall performance increased to about 8 % efficiency compared to conventional hydraulic ABS system. This system is expected to be applied for future vehicle.
|
|---|
