Wheel cylinder pressure control based on high speed on/off valve

A simplified model for the hydraulic unit of Anti-lock brake system is established with the software AMESim, which also obtains the dynamic characteristic curve of high speed on/off valve. Then the relationship width modulation frequency and duty with wheel cylinder pressure is studied. Two methods are presented to figure out the pulse width modulation duty, which are used to control wheel cylinder pressure, according to target cylinder pressure and actual cylinder pressure. The two methods are validated by constant signal, sine bias signal and ramp signal.