Patent ID: 6799132
Filing Date: 2004-09-28
Classification: B60T,Y10T

Abstract:
A microprocessor based smart resolution valve pressure control system for performing a wheel slip control valve response test, said microprocessor based smart resolution valve pressure control system comprising:a) a sensing means for ensuring that brakes disposed on a truck of a vehicle are at full service and that a truck brake cylinder pressure (BCP) is greater than a first predetermined BCP; b) a first testing means connected to a wheel slip control valve for operating said wheel slip control valve in response to sensing that said brakes disposed on said truck are at full service and that said first truck BCP is greater than said first predetermined BCP and for pulse releasing said wheel slip control valve to determine an elapsed time that said truck BCP drops from a second predetermined BCP to a third predetermined BCP; c) a release time adjustment means connected to said first testing means for one of adding and subtracting to and from, respectively, a release time and hold time depending on said elapsed time; d) a release time decision means for detecting if said release time adjustment means has changed said release time, and a reapply brake cylinder pressure means connected to said release time decision means for enabling again said first testing means if said release time has changed; e) an exhaust brake cylinder pressure means connected to said release time decision means for sending a pulsed release signal and a pulsed hold signal to said control valve and determining if an exhaust BCP is less than a predetermined amount after said pulsed release signal and pulsed hold signal; f) a second testing means connected to a continue decision means for applying an apply pulse to said control valve for a predetermined time and timing a BCP rise between a fourth predetermined BCP and a fifth predetermined BCP; g) an apply time adjustment means connected to said second testing means for one of adding and subtracting to and from, respectively, an apply time and hold time depending on said time of said BCP rise between said fourth predetermined BCP and said fifth predetermined BCP; and h) an apply time decision means connected to said apply time adjustment means for sending one of an enabling signal to a release brake cylinder pressure means if said apply time has changed and an end wheel slip control valve test signal, said release brake cylinder pressure means, when enabled, for enabling again said second testing means.