Method and circuit configuration to augment the driving stability of a road vehicle
AssigneeAlfred Teves GmbH
InventorsAlexander Kolbe, Klemens Roesch
Life of this patent
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Abstract
A method and a circuit configuration to augment the driving stability of a road vehicle using traction slip control by brake management. The drive wheel is identified which instantaneously exhibits the higher coefficient of friction (HM-wheel). The rotational pattern of this wheel is monitored and stabilized by brake management as soon as the traction slip of this wheel exceeds a limit value. Braking pressure which may exist in the wheel brake of the second drive wheel (LM-wheel) is decreased.
Claims18
A method to augment or preserve driving stability of a road vehicle by controlling traction slip by means of a brake management system, characterized in that a first wheel of a driven axle is found which instantaneously exhibits a higher coefficient of friction, in that a rotational pattern of the first wheel is monitored and stabilized by brake management as soon as the traction slip of the first wheel surpasses a limit value, as well as in that after the commencement of brake management on the first wheel exhibiting the higher coefficient of friction the introduction of braking pressure into a wheel brake of a second wheel of this axle is prevented, and braking pressure prevailing in the wheel brake of the second wheel kept constant or decreased.
A circuit configuration for augmenting driving stability, comprising circuitries for identifying a first wheel which instantaneously exhibits a higher coefficient of friction, and comprising circuitries for monitoring the first wheel and for controlling the braking pressure when the first wheel becomes unstable by implementing stability control, characterized in that the circuit configuration is provided as a supplementary unit to a circuit configuration for traction slip control by brake management, which sets in when a driven wheel becomes unstable and starts to function as soon as the vehicle speed exceeds a predetermined speed threshold, or as soon as predetermined criteria are fulfilled being indicative of an excessive load on the wheel brakes or on other vehicle components, and in that means are provided which, after brake management commences on the first wheel exhibiting the higher coefficient of friction, prevent the introduction of braking pressure into a wheel brake of a second wheel, and in that these means keep constant or reduce braking pressure prevailing in the wheel brake of the second wheel.
A method to improve driving stability of a road vehicle in which traction slip is regulated using brake management, said road vehicle having a driven axle, said driven axle having at least two wheels, each wheel having a respective brake and a respective coefficient of friction, the method comprising the steps of:
- (a) monitoring a respective rotation of each of said wheels, and calculating a respective measure of traction slip therefrom for each respective wheel;
- (b) determining when one of said measures of traction slip exceeds a predetermined value;
- (c) identifying a wheel of said driven axle which has a higher instantaneous coefficient of friction than the other wheel of said driven axle, said identifying being performed when said traction slip of said identified wheel exceeds said predetermined value;
- (d) stabilizing the rotation of said identified wheel using brake management, when said measure of traction slip exceeds said predetermined value;
- and
- (e) preventing an increase in braking pressure on said brake of said other wheel of said driven axle.
Apparatus for improving driving stability of a road vehicle having a traction slip control system, said traction slip control system using brake management, said road vehicle having a speed and a driven axle, said driven axle having at least two wheels, each wheel having a respective coefficient of friction, the apparatus comprising:
- means for monitoring a respective rotation of each of said wheels and for calculating a respective measure of traction slip therefrom for each respective wheel;
- means coupled to said monitoring means for determining when one of said measures of traction slip exceeds a predetermined value;
- means responsive to said determining means for identifying a wheel of said driven axle which has a higher instantaneous coefficient of friction than the other wheel of said driven axle;
- means responsive to said identifying means for stabilizing the rotation of said identified wheel using brake management;
- and
- means responsive to said identifying means for preventing an increase in braking pressure on said brake of said other wheel of said driven axle.
Dependencies are inferred from the claim text.