Walter C Sanders

US Patent:

49040278, Feb 27, 1990

Filed:

Oct 3, 1988

Appl. No.:

7/252941

Inventors:

Elmer T. Skantar - East Pittsburgh PA
Walter J. Sanders - Jeannette PA

Assignee:

American Standard Inc. - Wilmerding PA

International Classification:

B60T 1514
B60T 1368
B60T 1558

US Classification:

303 15

Abstract:

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.

US Patent:

46850520, Aug 4, 1987

Filed:

Feb 19, 1985

Appl. No.:

6/702530

Inventors:

Walter J. Sanders - Jeannette PA

Assignee:

American Standard Inc. - Wilmerding PA

International Classification:

G06F 1130

US Classification:

364426

Abstract:

A pulse train presence detector for a system having a number of interruptible devices, consists of a pulse generator, interface device which receives a periodic trigger signal and outputs a pulse train signal in response thereto, the pulse train signal is communicated to an NPN transistor and operates the transistor to alternating "on" and "off" states. A first current path is established during the transistor "off" state through which a first current flows and charges a first capacitor. A second current path branches off from the first current path, wherein a second current flows when the transistor is "on". A forward-biased diode in the first current path and an adjacent reverse-biased diode in the second current path block cross-flowing of currents between the respective paths. A second capacitor in the second current path is charged when the transistor is "on". The current in the second path flows as a result of the charged first capacitor in the first current path, this second current serving to energize relay and to charge the second capacitor.