Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1990-08-28
1993-04-27
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Pipeless valves
303 20, B60T 832, B60T 1718
Patent
active
052056198
ABSTRACT:
An electronic circuit, in particular for an anti-skid protection system for vehicles is provided with at least with one microcomputer (2). The microcomputer (2) controls a load (4) via a final amplifier (3). A resistor circuit (6, 7, 8) is furnished for surveillance of the final amplifier (3) as well as of the load (4). The resistor circuit (6, 7, 8) is disposed parallel to the final transistor (5). The microcomputer (2) or a separate control circuit scans the voltage at the junction nodal point (9) between the final transistor (5) and the load (4) at predetermined points in time and checks it for appropriate level. The resistor circuit (6, 7, 8) is connectable via an electronic switch (10, 11), controlled by the microcomputer (2) or by the separate control circuit, as desired with the operating voltage U.sub.B or with ground. The circuit allows a distinction of errors of the final transistor (5) and of the load (4).
REFERENCES:
patent: 4050747 (1977-09-01), Ruhnau et al.
patent: 4136912 (1979-01-01), Hesse et al.
patent: 4460962 (1984-07-01), Pape et al.
patent: 4547740 (1985-10-01), Nilsson
patent: 4635607 (1987-01-01), Yasuoka et al.
patent: 4925254 (1990-05-01), Holst et al.
Patent Abstract of Japan Ser. No. 52-103342, May 18, 1979, vol. 3/No. 58.
Holst Hans
Pape Klaus
Ruhnau Gerhard
Butler Douglas C.
Kasper Horst M.
Wabco Westinghouse Fahrzeugbremsen GmbH
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