Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1984-04-10
1986-03-18
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303111, 303114, 303DIG4, B60T 858, B60T 864
Patent
active
045764190
ABSTRACT:
A control unit (14, 60) controls the braking pressure (P) at the brakes or the wheels, at both right and left sides of an axle, in accordance with "select-low" and/or "select-high" mode. The system is improved by associating a pressure sensor responsive to braking pressure in at least one of the front wheels. The control unit (14, 60) is so arranged that, upon sensing a tendency to skid or block at the rear wheels (FIG. 3: t.sub.3), the pressure at the rear wheels is controlled to a lower level than that at which tendency to block had been sensed, and then a constant pressure maintenance phase is commanded at a predetermined pressure (P.sub.oHA) for an extended period of time (to t.sub.8), for example under control of a timing element (FIG. 2: 19) or until the pressure sensor determines that the braking pressure (P.sub.lVA) at the front wheels, which there initiated an anti-skid cycle due to a tendency to block, has increased, within the control cycle, by a predetermined value with respect to a similar value (P.sub.oVA) in a preceding cycle. The increases in pressure level--subsequent to a decrease--are stored in memory elements (FIG. 2: 23; FIG. 6: 65, 66) and compared with then existing pressure levels in a comparator (21; 67, 68) and logically combined to effect the foregoing control function.
REFERENCES:
patent: 4005910 (1977-02-01), Leiber et al.
patent: 4349876 (1982-09-01), Lindemann
patent: 4460963 (1984-07-01), Leiber et al.
Oberley Alvin
Reger Duane A.
Robert & Bosch GmbH
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