Method of and an apparatus for providing a safety check of the brake retardation capability of a brake system on a vehicle

摘要

Method of providing brake retardation capability safety check. Method includes generating a signal representing vehicle mass, and combining it with an electric brake feedback signal and a brake cylinder pressure signal to generate a signal representing vehicle deceleration rate. Integrating the signal representing vehicle acceleration rate to generate an output signal representative of a process cycle speed reduction value. Inputting and storing values of process cycle speed reduction output signals to and in, respectively, a summation unit. Adding such values inputted to summation unit to a predetermined number of seconds worth of process cycle speed reduction values and generating output signal representative of braking effort available in terms of speed reduction over such predetermined number of seconds. Inputting brake command signal to brake command jerk limiting unit. Adding a delay value to brake command signal and jerk limiting brake command signal to provide output signal having a value equal to deceleration rate request value. Inputting deceleration rate request output signal to minimum capability level determination unit and generating output signal representative of minimum acceptable braking capability level in terms of speed reduction over predetermined number of seconds and comparing braking effort available to minimum acceptable braking capability level and determine whether minimum required safe braking level has been achieved.