Timer circuit for drag operation in an engineman monitoring devi

Details Timer circuit for drag operation in an engineman monitoring devi Timer circuit for drag operation in an engineman monitoring devi

1989-02-07

1989-08-29

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

340575, G04F 800

Patent

active

048624330

ABSTRACT:
An improved timer circuit for engineman monitoring devices allows a "drag operation" without frequent operation of the audio/visual alarms of the monitoring devices. The circuit receives an input from an existing switch in the locomotive to select the drag input state, but this input state does not necessarily select a longer time period for the reset window. More particularly, if drag is off and the speed is between approximately 1/3 and 31/2 mph, the timeout period is long (e.g., 123 seconds), but if drag is on for this speed, the timeout period is doubled (e.g., 246 seconds). Over 31/2 mph, the state of the drag switch is ignored, and the timeout period is long until a predetermined speed is reached and thereafter decreases with increasing speed. In addition, at "zero" speed, i.e., below 1/3 mph, the timeout period is reduced to 20 seconds to prevent defeat of the system by tampering with the axle drive wires.

REFERENCES:
patent: 4196412 (1980-04-01), Sluis et al.

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