Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1977-05-16
1978-02-14
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 22R, B60T 1374
Patent
active
040735419
ABSTRACT:
A load-weighed voltage corresponding to a pneumatic brake command signal is obtained from a pressure/electric transducer to control the electric brakes of a vehicle also equipped with friction brakes. An electrical feedback signal representing the electric brake effectiveness is compared to the transducer output signal to derive an error signal corresponding to the friction brake requirement necessary to supplement the electric brake sufficiently to satisfy the brake command. An electric-pneumatic transducer converts this error signal to a pneumatic signal which is connected to a first control chamber of a self-lapping type relay valve device whose delivery port is connected to the vehicle brake cylinders. A cut-off valve controls communication of the pneumatic brake command signal with a second control chamber of the relay valve to effect operation of the relay valve only in the event of a malfunction of the electrical circuit components performing the friction brake requirement function.
REFERENCES:
patent: 3944287 (1976-03-01), Nagase
Kunin Stephen G.
McIntire, Jr. R. W.
The Nippon Air Brake Company, Ltd.
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