Patent ID: 6354676
Filing Date: 2002-03-12
Classification: B60T

Abstract:
A method for controlling the electronic braking force distribution in a hydraulic device for a vehicle braking system, which comprises a hydraulic unit comprising a main hydraulic circuit which connects a master cylinder and a wheel cylinder via an inlet valve and an auxiliary hydraulic circuit which connects the wheel cylinder and an auxiliary reservoir via an outlet valve and an electronic control device which controls the hydraulic unit, said method comprising the steps of:determining a degree of pressure applied on the brake pedal, determining estimated vehicle deceleration or vehicle wheel deceleration, controlling the inlet valve and the outlet valve for the rear wheels of the vehicle when the estimated vehicle deceleration or the vehicle wheel deceleration becomes larger than a threshold deceleration value upon pressing the brake pedal, for the purpose of conducting said electronic braking force distribution control, changing the threshold deceleration value by the degree of the pressure applied on the brake pedal, determining a rear wheel slip ratio, determining estimated vehicle speed, and initiating the electronic braking force distribution control when the estimated vehicle deceleration or vehicle wheel deceleration becomes larger than the threshold deceleration value and the rear wheel slip ratio relative to the estimated vehicle speed becomes larger than a predetermined slip value wherein, when upon pressurizing the brake pedal, if variations in the estimated vehicle deceleration or vehicle wheel deceleration become larger than a predetermined deceleration value and continue to be longer than a predetermined time, the threshold deceleration value for the estimated vehicle deceleration or vehicle wheel deceleration is to be smaller than when the variations in the estimated vehicle deceleration or vehicle wheel deceleration become smaller than the predetermined deceleration value or do not continue to be longer than the predetermined time.