Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1978-05-11
1981-04-07
Blix, Trygve M.
Fluid-pressure and analogous brake systems
Pipeless valves
303105, 303110, B60T 808
Patent
active
042602009
ABSTRACT:
An anti-lock brake control system for a vehicle with braked wheels comprises a sensor to produce a signal proportional to the deceleration/acceleration of the braked wheel, a deceleration sensing switch to respond to the deceleration/acceleration signal by producing a brake pressure release pulse when deceleration of the wheel exceeds a predetermined threshold level, a charge storage device which is adapted so that it charges in a predetermined progressive manner while the brake pressure release pulse is produced and discharges at a predetermined decay rate, a comparator that compares the potential on the charge storage device with a reference potential and produces an extension brake pressure release pulse according to their relative values, and apparatus to vary one of said potentials in a manner dependent on acceleration of the wheel above a preset acceleration threshold so that the extension brake pressure release pulse is terminated by increasing wheel acceleration. In one embodiment, the apparatus varies the reference potential so that the change of the reference potential with increasing acceleration is in the same sense as the change in the potential on the charge storage device when charging, the comparator producing said extension pulse only while the potential on the charge storage device exceeds the fixed reference potential. In another embodiment, the apparatus varies the potential on the charge storage device by discharging the latter after it has been charged from a fixed starting potential, the comparator producing an extension pulse as soon as the potential on the charge storage device exceeds a fixed reference potential and terminating the extension pulse once the potential on the charge storage device falls to a fixed terminating potential above the fixed reference potential.
REFERENCES:
patent: 3578819 (1971-05-01), Atkins
patent: 3584921 (1971-06-01), Crawford
patent: 3707311 (1972-12-01), Sharp
patent: 3790227 (1974-02-01), Dozier
patent: 3820857 (1974-06-01), Schnaibel et al.
patent: 3951467 (1976-04-01), Fleagle
patent: 3964796 (1976-06-01), Bremer
patent: 3966266 (1976-06-01), Atkins
patent: 4036536 (1977-07-01), Quon
Brearley Malcolm
White Alfred. K.
Blix Trygve M.
Eisenzope Reinhard J.
Girling Limited
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