Traction control system for motor vehicles

Details Traction control system for motor vehicles Traction control system for motor vehicles

1995-08-25

2001-06-26

Louis-Jacques, Jacques H. (Department: 3614)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Indication or control of braking, acceleration, or deceleration

C701S071000, C701S073000, C701S080000, C701S074000, C180S197000, C280S757000, C280S791000, C303S141000, C303S115600

Reexamination Certificate

active

06253142

ABSTRACT:

PRIOR ART
The invention relates to a traction control system.
Such a traction control system is known, for example, from DE 39 38 444 C1 to which U.S. Pat. No. 5,103,928 corresponds. In this publication, the maximum drive torque which can be transmitted by the driven wheels is determined and transmitted to a control device of the internal combustion engine. The said control device sets the torque, output by the internal combustion engine, in accordance with the calculated maximum drive torque which can be transmitted under the prevailing conditions. The maximum drive torque which can be transmitted is determined here from a term which is dependent on vehicle data and a term which is dependent on the difference between the desired slip and actual slip of the driven wheels of the vehicle. During the traction control, the calculated value of the maximum drive torque which can be transmitted is increased as a function of time in order to allow for the slip-dependent changes in the coefficient of friction and to get as near as possible to the real conditions. It is not proposed to take the coefficient of friction into account directly, and thus to determine the maximum drive torque which can be transmitted more accurately.
Therefore, the object of the invention is to specify measures which can be used to take into account directly the coefficient of friction between the driven wheels and the surface of the carriageway during traction control.
DE 42 39 711 A1 discloses a control system for a vehicle in which, for example, for traction control a desired engine torque is transmitted from a traction controller to a control system for the internal combustion engine, which desired engine torque is set by this control system. The control system of the internal combustion engine calculates the output engine torque and reports this back to the traction controller.
In the publication “Heiner Bubb, Ein Verfahren zur Bestimmung des Kraftschlusses zwischen Rad und Stra&bgr;e während der Fahrt (Heiner Bubb, A method for determining the grip between the wheel and the road while traveling), ATZ, Automombiltechnische Zeitschrift 83, 1981, 1, pp 31 to 36”, the dependence of the coefficient of friction between the wheel and the surface of the carriageway on slip and on the speed of the vehicle is shown. Measures for taking into account this coefficient of friction during traction control are not described.
ADVANTAGES OF THE INVENTION
The procedure according to the invention has the advantage that a reliable determination of the coefficient of friction between the wheels of the vehicle and the surface of the carriageway is made available and this is taken into account when determining the maximum drive torque which can be transmitted. This has particular advantages when cornering in a bend with a low coefficient of friction (for example, a bend which is wet from rain), it being possible to reduce the engine torque suitably in particular even while entering the bend and when the vehicle begins to become unstable. This also applies to traveling straight ahead on carriageways with an average and low coefficient of friction.
It is particularly advantageous that the higher slip requirement at higher speeds and the changing slip requirement of different types of tires, for example winter tires or summer tires with a soft rubber mixture, are taken into account when identifying the coefficient.


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Bubb, Heiner, “Ein Verfahren zur Bestimmung des Kraftschlusses zwischen Rad und strasse während der Fahrt” Automobiltecnische Zeitschrift, 83 (1981) 1, pp.31-36, Jan. 1981.

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