Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1978-04-24
1980-02-12
Eisenzopf, Reinhard J.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 15, B60T 1374
Patent
active
041880706
ABSTRACT:
A dynamic/friction brake blending valve device having a piston assembly arranged to operate a pressure regulator via which brake cylinder pressure is controlled. Associated with the relay valve device is an electrical circuit comprising a differential amplifier subject in a first mode of operation to a brake command signal and a dynamic brake signal representing the degree of dynamic brake effort being provided in response to the brake command. An error signal resulting from comparison of the brake command and dynamic brake signals is converted by a transducer to a corresponding fluid pressure that is supplied to a chamber formed between first and second differential pistons of the piston assembly to actuate the pressure regulator and thereby produce brake cylinder pressure corresponding to the deficiency of the dynamic brake. Another chamber formed between the second piston and a third differential piston of the piston assembly may be connected to a pneumatic control valve device that operates in response to brake pipe pressure variations, which may be made independently of the brake command signal, to provide apparatus for obtaining a back-up or emergency brake application in the event an electrical malfunction renders the differential amplifier inoperative. In a second mode of operation, the differential amplifier error signal is replaced by the dynamic brake signal and the brake pipe pressure is adjusted simultaneously with the brake command so as to correspond thereto. In this respect, the brake blending valve device itself accomplishes the comparison function provided by the differential amplifier in the first mode of operation, in order to supplement the dynamic brake with friction brake effort corresponding to any deficiency of the dynamic brake which may arise.
REFERENCES:
patent: 3814483 (1974-06-01), Coiner et al.
patent: 3814484 (1974-06-01), Matthews et al.
patent: 3823984 (1974-07-01), Parfitt et al.
Eisenzopf Reinhard J.
McIntire, Jr. R. W.
WABCO Westinghouse
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