Steering control system for a vehicle with a steered front axle and a steered rear axle
First Claim
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1. Steering control system for a four-wheel vehicle with a steered front axle and a steered rear axle, comprisingan anti-lock system operatively arranged to act on all four wheels;
- a device for intervening in steering of the rear axle such that, during a braking operation in which a different braking effect occurs on the left and on the right side of the vehicle, steering lock of the rear axle counteracts a yawing moment which arises, and the rear wheels are deflected in the direction of the vehicle side on which a higher braking effect occurs;
means for detecting different adhesion coefficients of at least two wheels of different sides of the vehicle, the difference between the adhesion coefficients being detected from a difference between different occurring brake pressures of at least two wheels of different sides of the vehicle in response to the control signals of one of an anti-lock system and a drive-slip control, wherein the device for intervening in the steering of the rear axle of the vehicle intervenes as a function of the difference between the adhesion coefficients; and
a drive-slip control acting at least on brakes of the driven wheels of the vehicle, independently of whether there is an anti-lock system signal or a drive-slip control signal, wherein the device causes a deflection of the rear wheels in the direction of the vehicle side on which the higher braking torque is generated.
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Abstract
A steering control system executes an automatic intervention in the steering of the rear axle when a μ-split condition is detected, in order to stabilize the tracking of the vehicle. The steering always takes place in the direction of the vehicle side on which the higher braking torque is generated; this applies also to cornering, irrespective of whether the lower μ-value is on the inside of the bend or on the outside of the bend and, furthermore, irrespective of whether the vehicle is being braked or accelerated.
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Citations
14 Claims
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1. Steering control system for a four-wheel vehicle with a steered front axle and a steered rear axle, comprising
an anti-lock system operatively arranged to act on all four wheels; -
a device for intervening in steering of the rear axle such that, during a braking operation in which a different braking effect occurs on the left and on the right side of the vehicle, steering lock of the rear axle counteracts a yawing moment which arises, and the rear wheels are deflected in the direction of the vehicle side on which a higher braking effect occurs; means for detecting different adhesion coefficients of at least two wheels of different sides of the vehicle, the difference between the adhesion coefficients being detected from a difference between different occurring brake pressures of at least two wheels of different sides of the vehicle in response to the control signals of one of an anti-lock system and a drive-slip control, wherein the device for intervening in the steering of the rear axle of the vehicle intervenes as a function of the difference between the adhesion coefficients; and a drive-slip control acting at least on brakes of the driven wheels of the vehicle, independently of whether there is an anti-lock system signal or a drive-slip control signal, wherein the device causes a deflection of the rear wheels in the direction of the vehicle side on which the higher braking torque is generated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification