Electricity: motive power systems – Braking – Plural – diverse or diversely controlled braking means
Patent
1986-04-16
1987-03-17
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Plural, diverse or diversely controlled braking means
318370, 105 61, 303 3, 303 20, H02P 316
Patent
active
046510710
ABSTRACT:
A brake control system for a railway car having a primary electric brake and a secondary friction brake that supplements the electric brake as the electric brake effectiveness fades. The secondary friction brake is normally applied in accordance with a first supplementary control signal provided by an electrical component, such as an operational amplifier, the output of which is the difference between a brake command signal and the actual braking produced by the electric brake. A second supplementary control signal corresponding to the brake command signal is effective to control the secondary friction brake, in response to either anomalies in the power supply or failure of the operational amplifier. A switch connects the brake command signal to an electric-pneumatic converter to provide pneumatic pressure to the friction brake corresponding to the brake command, and to concurrently terminate operation of the electric brake, when either one or both of the foregoing abnormalities are detected.
REFERENCES:
patent: 3488570 (1970-01-01), Vint, Jr. et al.
patent: 3560054 (1971-02-01), Sarbach
patent: 3774095 (1973-11-01), Coccia
patent: 4278298 (1981-07-01), Sauka et al.
Falce G. J.
Nippon Air Brake Co., Ltd.
Ro Bentsu
Shoop Jr. William M.
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