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US 4,904,027 AGranted
Digital air brake control system
AssigneeAmerican Standard Inc.
InventorsElmer T. Skantar, Walter J. Sanders
Life of this patent
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AssigneeAmerican Standard Inc.
InventorsElmer T. Skantar, Walter J. Sanders
Estimating the term…
A pneumatic pressure control arrangement for controlling the brakes of railway vehicles. A manual brake command controller converts a selected brake position into a corresponding electrical signal. An application magnet valve is connectable to a source of air pressure and to a storage device. A release magnet valve is connectable to atmosphere and to the storage device. An electropneumatic transducer senses the pressure in the storage device and provides a feedback signal. A microprocessor receives and compares the electrical signal with the feedback signal to develop an error signal which initially energizes the application magnet valve and the release magnet valve upon request of braking effort, and which subsequently pulses the application magnet valve when the pressure in the storage device is within a preselected control range, and which finally deenergizes the application magnet valve when the pressure in the storage device is within a preselected deadband range to cause a lap condition.
A digital air brake control system for railway vehicles comprising, means for initiating a desired brake demand signal, means responsive to the desired brake demand signal for providing timing and control signals, means including a pair of magnet valves conditioned by the timing and control signals for controlling the pressure of the brake line by monitoring the pressure in an equalizing reservoir, means for sensing the pressure in the equalizing reservoir and for providing a feedback signal to the timing and control means for calculating the difference between the desired brake command signal and the feedback signal to produce an error signal which causes the magnet valves of the pressure controlling means to be concurrently moved to opposite positions and then concurrently pulses the magnet valves in opposite positions with one of the magnet valves being decreasingly pulsed ON and alternately pulsed OFF until the pressure in the equalizing reservoir substantially coincides with that of the desired brake demand signal.
A pneumatic pressure control arrangement for controlling the brakes of railway vehicles comprising, a manual brake command controller for converting a selected brake position into a corresponding electrical signal, an application magnet valve connectable to a source of air pressure and to a storage device, a release magnet valve connectable to atmosphere and to the storage device, an electropneumatic transducer for sensing the pressure in the storage device and providing a feedback signal, a microprocessor means for receiving and comparing the electrical signal with the feedback signal to develop an error signal which initially causes the application magnet valve and the release magnet valve to be concurrently moved to opposite positions upon request of braking effort and which subsequently concurrently pulses the magnet valves in opposite positions in a decreasing manner when the pressure in the storage device comes within a preselected control range and which finally deactivates the magnet valves when the pressure in the storage device comes within a preselected deadband range to cause a lap condition.
Dependencies are inferred from the claim text.