Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1984-01-09
1985-08-06
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
188159, 303 15, 303 20, 303 68, B60T 1368
Patent
active
045331855
ABSTRACT:
Control system for electro-pneumatic compressed air brakes for rail vehicles with a servo valve (1) for control of a pilot pressure and for actuation of electrical contacts (40, 41) operable over a coupling (4) such that, at the beginning of an adjustment of the servo valve in the braking direction, at least one contact (40) is always closed while, at the beginning of an adjustment in the releasing direction, a different contact (41) is closed. The two contacts control the excitation of a brake and release contactor (50, 51) monitoring a brake and release circuit (56, 62) which, when switching, interrupts the circuits monitored by the contacts (40, 41) of the servo valve (1) by opening the coupling (4). Holding circuits for the brake and the release contactor (50, 51) are monitored by contacts of a second switching system (34); a piston (25) actuated by the pilot pressure against the main air line pressure serves to control the latter contacts. The control system permits control of the main air line pressure with sensitive control processes and slight pressure changes by very short excitation of a brake or release circuit (56, 62) but, in case of more extensive control processes with higher pressure changes in the main air line, by a lasting excitation of a brake or release circuit (56, 62) effected through the holding circuits.
REFERENCES:
patent: 2118412 (1938-05-01), McCune
patent: 2160209 (1939-05-01), Canetta
patent: 2933350 (1960-04-01), Hines
patent: 3716274 (1973-02-01), Pier
patent: 4239292 (1980-12-01), Nagase
Butler Douglas C.
Knorr-Bremse GmbH
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