US 6,205,393 B1Granted

Method of improving the control behavior of an antilocking system

AssigneeITT Manufacturing Enterprises, Inc.

InventorIvica Batistic

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Abstract

To improve the control behavior of an ABS, a driving situation on a low coefficient of friction is quickly and reliably identified. To this end, the reacceleration of the non-driven wheels following a control-induced braking pressure reduction is analyzed, and the existence of a low coefficient of friction is identified if simultaneously in the reacceleration phase the maximum reacceleration of the two non-driven wheels is below a predefined limit value and the maximum filtered acceleration is below a specific predefined limit value, and if the duration of the positive variation of the filtered acceleration in this phase exceeds a predetermined time limit value. When these conditions are satisfied, braking pressure reduction in the following instability phase of the wheels is increased, for example, by a permanent actuation of the pressure reducing valves.

Claims5

Dependent claims

Method of improving the control behavior of an anti-lock brake system, wherein the rotational behavior of the vehicle wheels is measured and evaluated for determining slip, wheel deceleration wheel acceleration and other control quantities, in order to assess the instantaneous coefficient of friction between the wheels and the road surface and to generate braking pressure control signals, comprising the steps of:

A) analyzing a reacceleration of at least one non-driven wheel following a control-induced braking pressure reduction on said at least one non-driven wheel, and determining, generally concurrently,
B) determining, and generating an affirmative signal, if a reacceleration of said at least one non-driven wheel is below a predefined limit value,
C) determining, and generating an affirmative signal, if a maximum filtered acceleration of said at least one non-driven wheel is below a predefined limit value,
D) determining, and generating an affirmative signal, if the duration of a positive portion of the maximum filtered acceleration exceeds a predetermined time interval, and
E) reducing the braking pressure on said at least one non-driven wheel if affirmative signals are generated in steps B, C, and D.

2 more elements

Dependencies are inferred from the claim text.