Method and device for traction control (TCS) of a motor vehicle as a function of radius of curve and transverse acceleration
First Claim
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1. A method for providing traction control for a motor vehicle operating on a curve of a road, the method comprising the steps of:
- recording, using at least one sensor, an acceleration in a transverse axis, a driving speed of the motor vehicle, a speed of a wheel and a radius of a curve of a road;
determining a slip value of a wheel from recorded values;
comparing the slip value with a predefined slip threshold;
at least one of braking the wheel on an inside of the curve of the road upon exceeding the predefined slip threshold, and reducing a drive torque of an engine of the motor vehicle to limit a traction of the motor vehicle upon exceeding the predefined slip threshold; and
changing the predefined slip threshold for the wheel on the inside of the curve of the road upon exceeding the predefined slip threshold, wherein the predefined slip threshold is determined as a function of the acceleration in the traverse axis according to a straight line equation of LAMB AY=OFF AY+AY FAK*AY, where OFF AY is a constant offset value and AY FAK is a slope parameter for the straight line equation.
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Abstract
A method and a device, respectively, for providing traction control of a motor vehicle in which the slip of the driven wheel of the motor vehicle on the inside of the curve is only regulated when its slip exceeds a predefined slip threshold. The predefined slip threshold is weighted with a weighting factor as a function in dependence on the occurring transverse acceleration, and in this connection, the weighting factor is given by an equation as being inversely proportional to the radius of curve of the road.
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Citations
10 Claims
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1. A method for providing traction control for a motor vehicle operating on a curve of a road, the method comprising the steps of:
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recording, using at least one sensor, an acceleration in a transverse axis, a driving speed of the motor vehicle, a speed of a wheel and a radius of a curve of a road;
determining a slip value of a wheel from recorded values;
comparing the slip value with a predefined slip threshold;
at least one of braking the wheel on an inside of the curve of the road upon exceeding the predefined slip threshold, and reducing a drive torque of an engine of the motor vehicle to limit a traction of the motor vehicle upon exceeding the predefined slip threshold; and
changing the predefined slip threshold for the wheel on the inside of the curve of the road upon exceeding the predefined slip threshold, wherein the predefined slip threshold is determined as a function of the acceleration in the traverse axis according to a straight line equation of LAMB AY=OFF AY+AY FAK*AY, where OFF AY is a constant offset value and AY FAK is a slope parameter for the straight line equation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for providing traction control for a motor vehicle, the device comprising:
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at least one sensor for recording a transverse acceleration of the motor vehicle, a driving speed and a slip of a wheel;
a control device for providing a slip threshold; and
a controlling device for controlling the slip of the wheel on an inside of a curve of a road;
wherein the control device includes an arrangement for determining the slip threshold by increasing the slip threshold as a function of the transverse acceleration of the motor vehicle and by decreasing the slip threshold as a function of a weighted radius of the curve. - View Dependent Claims (9, 10)
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Specification