Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1997-01-29
1998-04-14
Ballato, Josie
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 15, B60T 1300
Patent
active
057384177
ABSTRACT:
A brake pipe sensing unit may be used with a universal pneumatic brake control unit of a rail vehicle. The brake pipe sensing unit includes a control reservoir, an auxiliary reservoir, a three state valve, a quick service valve, a brake pipe transducer and a transmission device. The control reservoir is used as a volume in which gas under pressure may stored and from which gas under pressure may be supplied. The auxiliary reservoir communicates with a supply port of the universal unit and with a first and a second route of the brake pipe sensing unit. The three state valve has a first pilot port in communication with a brake pipe of the rail vehicle, a second pilot port in communication with the control reservoir, and first and second exhaust ports both of which connect to atmosphere. The three state valve operates in an apply position, a release position and a lap position depending on the pressure bearing on the first and second pilot ports. The quick service valve connects within the first route and has a service pilot port in communication with both the auxiliary reservoir and the supply port. The quick service valve closes the first route when pressure at the service pilot port exceeds a preselected level. The brake pipe transducer converts pressure within the brake pipe to an electrical signal. The transmission device communicates the electrical signal received from the brake pipe transducer to a brake control bus on the rail vehicle.
REFERENCES:
patent: 5172316 (1992-12-01), Root et al.
patent: 5281007 (1994-01-01), Brainard
Mazur Richard J.
Wood James A.
Ballato Josie
Westinghouse Air Brake Company
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