Method of braking a vehicle having a wheel anti brake-lock or an

Details Method of braking a vehicle having a wheel anti brake-lock or an Method of braking a vehicle having a wheel anti brake-lock or an

1982-09-29

1984-11-27

Truhe, J. V.

Boots, shoes, and leggings

303 95, 303 96, B60T 808

Patent

active

044854455

ABSTRACT:
To provide for close adaptation of braking performance by braking pressure maintenance, braking pressure dropping, or braking pressure increase to match wheel acceleration or deceleration, and operating constants within the overall braking system, the wheel anti brake-lock responds when wheel deceleration drops below a predetermined reference threshold. Wheel speed is sensed in steps, for example in intervals of 0.25 km/h, and the steps are counted. A predetermined brake pressure decrease time (t.sub.min) is initiated when wheel speed drops below the reference wheel speed, the total time (t.sub.a) of pressure decrease being the minimum time plus a number of first control time intervals (.DELTA..sub.1t) which depend on the number of speed steps being passed by the wheel as it decelerates. If the wheel speed, after the pressure decrease, does not decelerate at the same rate anymore, a pressure maintenance phase is commanded for a maximum time (.DELTA..sub.2t) which, however, is foreshortened by second control timing intervals (.DELTA..sub.2t) in dependence on the wheel passing further speed steps or stages. If the wheel should decelerate substantially (.lambda..sub.2) or drop below a deceleration threshold (-b), a further pressure decrease phase can be immediately initiated, overriding the pressure maintenance phase. The first and second control timing intervals can also be made dependent on each other.

REFERENCES:
patent: 3863993 (1975-06-01), Fleischer et al.
patent: 3930688 (1976-01-01), Ran et al.

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