System for controlling the traction slip of a vehicle
First Claim
1. Method of controlling a traction slip of a vehicle on a roadway with sidewise different coefficients of friction, comprising the steps of:
- identifying a driving situation on a roadway with sidewise different coefficients of friction and, when the driving situation is identified and traction slip is encountered on both wheels, decreasing the brake pressure on the driven wheel on the low coefficient-of-friction side, further including the steps of;
determining which vehicle side is the high coefficient-of-friction side and which is the low coefficient-of-friction side, checking whether the slip of the driven wheel on the high coefficient-of-friction side is above a first threshold value, checking whether the slip of the driven wheel on the low coefficient-of-friction side is above a second threshold value, checking whether an acceleration of the traction slip or a wheel acceleration of the driven wheel on the high coefficient-of-friction side is above a positive threshold value and whether the acceleration of the traction slip or the wheel acceleration of the driven wheel on the low coefficient-of-friction side is below a negative threshold value, and checking the brake pressures on the two wheels or comparing the brake pressures one to the other, wherein when checking the brake pressures, the brake pressure on the low coefficient-of-friction side is checked as to whether it is above a third threshold value, and the brake pressure on the high coefficient-of-friction side is checked as to whether it is below a fourth threshold value.
1 Assignment
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Accused Products
Abstract
A method for controlling the traction slip of a vehicle on a roadway with sidewise different coefficients of friction includes the following steps: identifying a driving situation on a roadway with sidewise different coefficients of friction and, when the driving situation is identified and traction slip is encountered on both wheels, decreasing the brake pressure of the driven wheel on the low coefficient-of-friction side. A device for controlling the traction slip of a vehicle on a roadway with sidewise different coefficients of friction includes a determining device for determining a driving situation on a roadway with sidewise different coefficients of friction, and a brake actuation control which decreases the brake pressure of the driven wheel on the low coefficient-of-friction side when the driving situation is identified and traction slip is encountered on both wheels.
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Citations
22 Claims
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1. Method of controlling a traction slip of a vehicle on a roadway with sidewise different coefficients of friction, comprising the steps of:
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identifying a driving situation on a roadway with sidewise different coefficients of friction and, when the driving situation is identified and traction slip is encountered on both wheels, decreasing the brake pressure on the driven wheel on the low coefficient-of-friction side, further including the steps of;
determining which vehicle side is the high coefficient-of-friction side and which is the low coefficient-of-friction side, checking whether the slip of the driven wheel on the high coefficient-of-friction side is above a first threshold value, checking whether the slip of the driven wheel on the low coefficient-of-friction side is above a second threshold value, checking whether an acceleration of the traction slip or a wheel acceleration of the driven wheel on the high coefficient-of-friction side is above a positive threshold value and whether the acceleration of the traction slip or the wheel acceleration of the driven wheel on the low coefficient-of-friction side is below a negative threshold value, and checking the brake pressures on the two wheels or comparing the brake pressures one to the other, wherein when checking the brake pressures, the brake pressure on the low coefficient-of-friction side is checked as to whether it is above a third threshold value, and the brake pressure on the high coefficient-of-friction side is checked as to whether it is below a fourth threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Device for controlling a traction slip of a vehicle on a roadway with sidewise different coefficients of friction, comprising:
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an identification device for identifying a driving situation on a roadway with sidewise different coefficients of friction, a brake actuation control which decreases the brake pressure of the driven wheel on the low coefficient-of-friction side when the driving situation is identified and traction slip is encountered on both wheels, wherein the identification device includes the following components;
a determining device for determining which vehicle side is the high coefficient-of-friction side and which is the low coefficient-of-friction side, and a checking device for checking whether the slip of the driven wheel on the high coefficient-of-friction side is above a first threshold value, whether the slip of the driven wheel on the low coefficient-of-friction side is above a second threshold value, whether an acceleration of the traction slip or a wheel acceleration of the driven wheel on the high coefficient-of-friction side is above a positive threshold value, and whether the acceleration of the traction slip or the wheel acceleration of the driven wheel on the low coefficient-of-friction side is below a negative threshold value, and for checking the brake pressures on the two wheels or comparing the brake pressures one to the other, wherein the checking device checks the brake pressure on the low coefficient-of-friction side as to whether it is above a third threshold value, and checks the brake pressure on the high coefficient-of-friction side as to whether it is below a fourth threshold value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. Method of controlling a traction slip of a vehicle on a roadway with sidewise different coefficients of friction, comprising the steps of:
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identifying a driving situation on a roadway with sidewise different coefficients of friction and, when the driving situation is identified and traction slip is encountered on both wheels, decreasing the brake pressure on the driven wheel on the low coefficient-of-friction side, further including the steps of;
determining which vehicle side is the high coefficient-of-friction side and which is the low coefficient-of-friction side, checking whether the slip of the driven wheel on the high coefficient-of-friction side is above a first threshold value, checking whether the slip of the driven wheel on the low coefficient-of-friction side is above a second threshold value, checking whether an acceleration of the traction slip or a wheel acceleration of the driven wheel on the high coefficient-of-friction side is above a positive threshold value and whether the acceleration of the traction slip or the wheel acceleration of the driven wheel on the low coefficient-of-fiction side is below a negative threshold value, and checking the brake pressures on the two wheels or comparing the brake pressures one to the other, wherein when comparing the brake pressures a check is made whether the brake pressure on the high coefficient-of-friction side is below the brake pressure on the low coefficient-of-friction side at least by a defined amount.
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18. Method of controlling a traction slip of a vehicle on a roadway with sidewise different coefficients of friction, comprising the steps of:
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identifying a driving situation on a roadway with sidewise different coefficients of friction and, when the driving situation is identified and traction slip is encountered on both wheels, decreasing the brake pressure on the driven wheel on the low coefficient-of-friction side, further including the steps of;
determining which vehicle side is the high coefficient-of-friction side and which is the low coefficient-of-friction side, checking whether the slip of the driven wheel on the high coefficient-of-friction side is above a first threshold value, checking whether the slip of the driven wheel on the low coefficient-of-friction side is above a second threshold value, checking whether an acceleration of the traction slip or a wheel acceleration of the driven wheel on the high coefficient-of-friction side is above a positive threshold value and whether the acceleration of the traction slip or the wheel acceleration of the driven wheel on the low coefficient-of-friction side is below a negative threshold value, and checking the brake pressures on the two wheels or comparing the brake pressures one to the other, further including the step of decreasing the brake pressure according to a definable gradient. - View Dependent Claims (19)
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20. Device for controlling a traction slip of a vehicle on a roadway with sidewise different coefficients of friction, comprising:
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an identification device for identifying a driving situation on a roadway with sidewise different coefficients of friction, a brake actuation control which decreases the brake pressure of the driven wheel on the low coefficient-of-friction side when the driving situation is identified and traction slip is encountered on both wheels, wherein the identification device includes the following components;
a determining device for determining which vehicle side is the high coefficient-of-friction side and which is the low coefficient-of-friction side, and a checking device for checking whether the slip of the driven wheel on the high coefficient-of-friction side is above a first threshold value, whether the slip of the driven wheel on the low coefficient-of-friction side is above a second threshold value, whether an acceleration of the traction slip or the wheel acceleration of the driven wheel on the high coefficient-of-friction side is above a positive threshold value, and whether the acceleration of the traction slip or the wheel acceleration of the driven wheel on the low coefficient-of-friction side is below a negative threshold value, and for checking the brake pressures on the two wheels or comparing the brake pressures one to the other, wherein that when comparing the brake pressures a check is made as to whether the brake pressure on the high coefficient-of-friction side is below the brake pressure on the low coefficient-of-friction side at least by a defined amount.
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21. Device for controlling a traction slip of a vehicle on a roadway with sidewise different coefficients of friction, comprising:
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an identification device for identifying a driving situation on a roadway with sidewise different coefficients of friction, a brake actuation control which decreases the brake pressure of the driven wheel on the low coefficient-of-friction side when the driving situation is identified and traction slip is encountered on both wheels, wherein the identification device includes the following components;
a determining device for determining which vehicle side is the high coefficient-of-friction side and which is the low coefficient-of-friction side, and a checking device for checking whether the slip of the driven wheel on the high coefficient-of-friction side is above a first threshold value, whether the slip of the driven wheel on the low coefficient-of-friction side is above a second threshold value, whether an acceleration of the traction slip or the wheel acceleration of the driven wheel on the high coefficient-of-friction side is above a positive threshold value, and whether the acceleration of the traction slip or the wheel acceleration of the driven wheel on the low coefficient-of-friction side is below a negative threshold value, and for checking the brake pressures on the two wheels or comparing the brake pressures one to the other, wherein the brake actuation control includes a preset values output for predefining a nominal gradient for brake pressure decrease. - View Dependent Claims (22)
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Specification