Main cylinder pressure estimating unit for motor vehicle ABS braking system

摘要

The main cylinder pressure estimating unit uses a hydraulic pressure regulating unit, which regulates a hydraulic pressure, produced by a main cylinder of a braking system for a motor vehicle. This pressure is applied at each wheel cylinder, to increase or reduce this corresp. to a driving condition of the motor vehicle. An initiating unit is provided for adjusting an estimated value for a main cylinder pressure according to a braking operation of the vehicle, coincidental with a predetermined formula for a predetermined period of time. Also included in a main cylinder pressure correction/estimating unit, which after the elapse of the predetermined period of time, and is operable after the start of the pressure increase/redn. regulation, for correcting the estimated value of the main cylinder pressure, to reduce this to correspond with an expected quantity of the pressure increase for a case. After which the hydraulic pressure to be applied at the wheel cylinders would be just increased by the hydraulic pressure regulating unit. For the correcting of the estimated value of the main cylinder pressure, to increase this in correspondence with an expected pressure to be applied at the wheel cylinders should be just reduced.