Fluid-pressure and analogous brake systems – With pump
Patent
1989-09-28
1991-03-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
With pump
303116, 303DIG3, B60T 1320, B60T 1366, B60T 1722, B60T 832
Patent
active
050005200
ABSTRACT:
A switching arrangement for the control of the motor (1) a hydraulic pump (2) in an auxiliary pressure supply system of a brake system. A motor relay (9) is provided which is controlled by the switching control (8) of a pressure switch (7) and actuates an operating contact (11) through the intermediary of which the motor (1) is connectible to the source of current (.sub.Batt.sup.+U). In the event of an auxiliary pressure drop to the lower limit, the pressure switch (7) responds. If the pressure rises up to an upper limit, the switching contact (8) is opened again. A switching contact (13) is provided which closes in the event of a pressure drop to a pressure minimum and activates a brake warning lamp (15). An auxiliary motor relay (16) is inserted in parallel to the lamp whose operating contact (18) switches the pump motor (1) on even if, for example, the pressure switch (7) fails. The auxiliary motor relay (16) is released again as soon as the auxiliary pressure has exceeded the pressure minimum and has again risen to an auxiliary pressure which is still below the lower limit.
REFERENCES:
patent: 3516715 (1970-06-01), Fielek et al.
patent: 3907378 (1975-09-01), Leiber
patent: 4357054 (1982-11-01), Leiber
patent: 4402554 (1983-09-01), Belart
patent: 4421361 (1983-12-01), Arikawa et al.
patent: 4699435 (1987-10-01), Wupper
patent: 4728156 (1988-03-01), Burgdorf et al.
patent: 4802710 (1989-02-01), Burgdorf et al.
patent: 4848847 (1989-07-01), Reinartz et al.
Alfred Teves GmbH
Butler Douglas C.
Lewis J. Gordon
Seitter Robert P.
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