Patent ID: 6698848
Filing Date: 2004-03-02
Classification: B60T

Abstract:
A time reset safety timer circuit for use on a rail vehicle, said time reset safety timer circuit comprising:a) at least one truck timeout timer means engageable with such rail vehicle and, in response to receiving at least one timed out signal, performing a first timing operation for a first predetermined duration using a first timing circuit in said at least one truck timeout timer means and at the end of said first timing operation resetting said first timing circuit and sending a safety timer reset signal; b) at least one truck timer circuit means having a second timing circuit and being connected to said at least one truck timeout timer means for communicating said at least one timed out signal to said at least one truck timeout timer means after said second timing circuit performs a second timing operation for a second predetermined time upon receipt of a detection signal indicating a detection of the presence of a power feed, and after the completion of said second timing operation sending said at least one timed out signal to said at least one truck timeout timer means, said second timing circuit being reset by one of receipt of said safety timer reset signal and an interruption of said detection signal indicating the absence of said power feed when said second timer circuit has started said second timing operation and prior to the lapse of said second predetermined time; c) at least one truck power feed interface means connected to said at least one truck timer circuit means for receiving a wheel slip correction enable signal from said at least one truck timer circuit means, said at least one truck power feed interface means connected to at least one magnet valve driver circuit and at least one wheel slip magnet valve, said at least one truck power feed interface means also for one of passing and interrupting said power feed between said at least one magnet valve driver circuit and said at least one wheel slip magnet valve; and d) at least one truck wheel slip detection circuit connected to at least one input of said at least one wheel slip magnet valve for detecting the presence of said power feed, and also communicating said presence of said power feed to said at least one truck timer circuit means, said at least one truck timer circuit means used for one of applying and disabling said wheel slip correction enable signal to said at least one truck power feed interface means after receiving said detection signal from said at least one truck wheel slip detection circuit.