Patent ID: 6092880
Filing Date: 2000-07-25
Classification: B60T

Abstract:
A power assisted braking system for a vehicle having anti-skid capability and including an operator actuatable pedal; means for measuring driver input force applied to said pedal to command the application of wheel brake pressure; means for measuring an actual hydraulic pressure applied to wheel brakes; means for determining vehicle velocity and for computing vehicle deceleration; and primary and secondary pressurized fluid sources, the system being operable in a normal mode utilizing the primary source to provide normal power assisted braking; means for detecting a malfunction in the primary braking system fluid source for substituting the secondary fluid source for the primary fluid source to provide continued back-up power assisted braking, the system being operable in a first back-up mode upon detecting a malfunction of the primary braking system, a command for braking, and a predetermined vehicle speed to provide braking with input force compared to calculated vehicle deceleration to generate braking pressure build and decay commands, said system being operable in a second back-up mode upon detecting a malfunction of the primary braking system, a demand for braking, and a vehicle speed lower than said predetermined speed to provide braking with pedal force compared to a wheel brake pressures to generate braking pressure build and decay commands.