Patent ID: 6758537
Filing Date: 2004-07-06
Classification: B60T

Abstract:
A method of providing a regulated brake fluid apply to a first wheel brake paired with a second wheel brake in a vehicle braking system, the system having a master cylinder, a fluid pump having an inlet and a pressure output, an accumulator connected to the inlet of the pump, a first wheel brake apply valve connected between the pressure output of the fluid pump and the first wheel brake, a second wheel brake apply valve connected between the pressure output of the fluid pump and the second wheel brake, blow-off valve apparatus connected to limit fluid pressure applied from the pressure output of the pump to the first and second brake apply valves to a first predetermined pressure, a first wheel brake release valve connected to return fluid from the first wheel brake to the accumulator, and a second wheel brake release valve connected to return fluid from the second wheel brake to the accumulator, the method comprising the steps:providing a quantity of fluid to the accumulator from the master cylinder; and when the quantity of fluid has been provided, (a) maintaining the first wheel brake apply valve in an open condition and the first wheel brake release valve in a closed condition, (b) controlling the second wheel brake apply valve to provide a second predetermined fluid pressure less than the first predetermined fluid pressure to the second wheel brake apply valve and through the open first wheel brake apply valve to the first wheel brake, the second predetermined fluid pressure being a desired brake pressure for the first wheel brake; and (c) activating the second wheel brake release valve to permit flow of brake fluid to the accumulator and maintaining the second wheel brake at a third predetermined pressure below the second predetermined fluid pressure, the third fluid pressure being a desired brake pressure for the second wheel brake.