Magnet valve safety check and fault indication integrator

Details Magnet valve safety check and fault indication integrator Magnet valve safety check and fault indication integrator

1990-10-22

1992-03-24

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Pipeless valves

188181C, 303 20, 303107, 303103, 36442601, B60T 888

Patent

active

050981692

ABSTRACT:
A magnet valve safety check and fault indication integrator including a first comparator for selecting the highest axle speed of a vehicle, a second comparator for determining whether the highest axle speed is less than a preset speed, an indicator for indicating if the vehicle is stopped, a timer for determining if the vehicle has been stopped for a predetermined time, a first sensor for sensing a transition from a braking mode to a power mode, an inhibit device for inhibiting all magnet valve feedback faults when the vehicle is stopped and in a brake mode for a period longer than the predetermined time, a timer circuit for ascertaining if a wheel slip is not in progress for a certain time period, a check circuit for monitoring the magnet valve feedback to determine if the magnet valve is not in an application state, a magnet valve cutout device for holding a cutout request until it is reset by a station stop signal, an event recorder for indicating that the vehicle speed is not less than the preset speed, a safety timer for designating a wheel slip inhibit in not in effect, a fault sensor for selectively blocking or passing a valve cutout request, an interface circuit for receiving three safety functions, and a code generation circuit for receiving the wheel slip inhibit event, the safety-timer event and the feedback fault for being logged one for every brake to power transition.

REFERENCES:
patent: 4598953 (1986-07-01), Wood et al.
patent: 4941099 (1990-07-01), Wood et al.
patent: 4972145 (1990-11-01), Wood et al.
patent: 4999779 (1991-03-01), Wood et al.

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