Control of ABS threshold without accompanying reduction of brake

Details Control of ABS threshold without accompanying reduction of brake Control of ABS threshold without accompanying reduction of brake

1991-09-30

1993-10-05

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303105, 303 93, 36442602, B60T 832, B60T 878

Patent

active

052498506

ABSTRACT:
In a method of controlling the brake pressure of a vehicle brake system equipped with anti-lock protection it is provided to measure the slip and/or rotational retardation of a wheel whose brake is applied and to compare each measured value with a given threshold value so as to lower the brake pressure if the threshold value proves to have been surpassed. Undesired pressure reductions can be avoided by increasing the threshold value for given periods of time from a basic value (S.sub.G) and subsequently decreasing it again. At a point in time T.sub.1 at which the rotational retardation of the braked wheel is greater than a value corresponding to a physically feasible slowdown of the vehicle the threshold value is increased abruptly, to be decreased thereafter according to a predetermined function of time. During the lowering of the threshold value the change in speed of the retarded wheel is measured over given intervals of time .DELTA.T and compared with the instantaneous higher threshold value. If the comparison demonstrates that the change in speed in question is greater than the instantaneous raise in threshold value, the threshold value is reduced to the basic value (S.sub. G).

REFERENCES:
patent: Re31383 (1983-09-01), Leiber et al.
patent: 4140353 (1979-02-01), Riordan
patent: 4675819 (1987-06-01), Fennel
patent: 4701855 (1987-10-01), Fennel
patent: 4739484 (1988-04-01), Fennel
patent: 4938544 (1990-07-01), Braschel et al.

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