Fluid-pressure and analogous brake systems – Speed-controlled – With yaw control
Reexamination Certificate
2000-04-28
2004-06-01
Lavinder, Jack (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
With yaw control
C303S149000, C303S146000, C303SDIG002
Reexamination Certificate
active
06742851
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method for controlling vehicle stability and more particularly relates to detecting and favorably influencing a defined driving situation in curves.
BACKGROUND OF THE INVENTION
FIG. 1
shows a road surface
10
on which a vehicle
11
drives in the direction of the arrow v which represents a certain vehicle speed v. The road surface has an inner area
10
i
on which the inner wheels
12
i
of the vehicle travel and an outer area
10
a
on which the outer wheels
12
o
of the vehicle
11
travel. The separation is indicated by the dotted line (which is not intended to be the center line of a road). During cornering, the outer wheels
12
o
are usually subjected to greater load than the inner wheels
12
i
, because a rolling moment about the longitudinal axis of the vehicle is produced by the centrifugal force which is applied to the point of gravity of the vehicle situated above the road surface
10
. The rolling moment must be compensated by an increased force on the outer wheels
12
o
. When braking in curves is so intensive that the anti-lock system (ABS) intervenes, the result is that due to the higher wheel load on the outside of a curve, the outer wheels
12
o
usually experience a less potential or, at most, equally potential, braking pressure decrease compared to the respectively associated inner wheels
12
i
. Nevertheless, swerving of the vehicle has been encountered in critical operating conditions with ABS in such a fashion that the vehicle turns inwardly in a curve.
An object of the present invention is to provide a method and a device for detecting the above critical condition and a method and a device for favorably influencing the yaw torque in the above situation.
The case may occur that the coefficient of friction &mgr; between wheel
12
and road surface
10
on outside road surface portions
10
o
is lower than the coefficient of friction between the wheels
12
i
on the inside of a curve and the road surface inner side
10
i
. This may cause an outer wheel
12
o
to lock earlier than an inner wheel
12
i
so that, accordingly, the ABS reduces the brake pressure p
o
for an outwardly disposed wheel
12
o
to a greater extent than for an inwardly disposed wheel
12
i
in order to prevent locking of the outer wheel. The result is that the brake force F
o
on the outer wheel is lower than the brake force F
i
on the inner wheel
12
i
. This generates a yaw torque M
Y
about the vertical axis of the vehicle which, different from the conventional case, is not opposed to the vehicle rotation that is already provided, but turns in the same direction so that there is the risk of the vehicle, induced by the yaw torque M
Y
, beginning to turn inwards into the curve due to the higher brake force.
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Zanten Van, A.: “FDR-Die Fahrdynamik-regelung von Bosch” ATZ, vol. 96, No. 11, 1994, p. 674-689.
Gronau Ralph
Roll Georg
Waldbauer Dirk
Woywod Jürgen
Continental Teves AG & Co. OhG
King Bradley
Lavinder Jack
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