Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1976-04-23
1977-02-01
Blix, Trygve M.
Fluid-pressure and analogous brake systems
Pipeless valves
303106, B60T 802, B60T 810
Patent
active
040059103
ABSTRACT:
An antilocking control system for vehicles in which control signals for controlling a pressure regulating unit associated with two wheels or two groups of wheels are produced in an evaluating circuit from the signals of at least one sensor associated with these wheels or groups of wheels and in which the pressure is at times controlled based on the rotational behavior of the wheel first tending to lock (select-low) and at times based on the rotational behavior of the wheel being the last to show a tendency to lock (select-high). During the select-low mode of operation the duration T.sub.1 of the pressure buildup phase following a pressure reduction phase is measured until there again occurs a tendency to lock at at least one wheel and then the mode of operation is switched to the select-high mode. During the select-high mode of operation the duration T.sub.2 of the pressure increase period is measured and the result is continuously compared with the measured duration (T.sub.1) of the pressure buildup phase during select-low operation. When the measured duration T.sub.2 reaches a given relationship to the duration T.sub.1, the select-high mode of operation is continued for a given duration T.sub.3 after which the mode of operation is switched back to the select-low mode. A switching arrangement is provided which responds if, during the select-high mode of operation, the second wheel (or group of wheels) also shows a tendency to lock before a given time duration T.sub.2 has been reached, to effect switching back to the select-low mode of operation.
REFERENCES:
patent: 3535004 (1970-10-01), Howard
patent: 3797892 (1974-03-01), Leiber
Leiber Heinz
Weber Werner
Blix Trygve M.
Eisenzopf Reinhard J.
Teldix GmbH
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