Method of estimating the risk of a vehicle overturning
First Claim
1. A method of estimating an overturn risk of a vehicle, in which a transverse acceleration of the vehicle is constantly determined, and a rotational wheel speed behavior of the vehicle wheels is monitored, the method comprising the acts of:
- determining the overturn risk specifically;
a) by precalculating a rolling motion of the vehicle to be expected by using the transverse acceleration,and redundantlyb) as a function of the transverse acceleration and as a function of whether the vehicle is braked or unbraked through a braking intervention by monitoring the rotational wheel speed behaviour,wherein, in a case of a braked vehicle, a brake pressure is lowered at vehicle brakes of wheels on the inside of a turn.
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Abstract
The invention relates to a method for redundantly estimating, i.e. by various sub-methods, the risk of lateral overturn of a vehicle. One sub-method involves estimating the risk of overturn according to the actual braking state of the vehicle—braking or strong braking, or not braking or slight braking—by monitoring the rotational speed behavior of the wheels on the inside of the turn. Another sub-method involves pre-calculating the rolling motion of the vehicle about the longitudinal axis thereof over a short time span of, for example, 0.5 s to 1.5 s on the basis of instantaneous movement parameters and assessing the risk of overturn on the basis of the anticipated rolling motion.
29 Citations
22 Claims
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1. A method of estimating an overturn risk of a vehicle, in which a transverse acceleration of the vehicle is constantly determined, and a rotational wheel speed behavior of the vehicle wheels is monitored, the method comprising the acts of:
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determining the overturn risk specifically; a) by precalculating a rolling motion of the vehicle to be expected by using the transverse acceleration, and redundantly b) as a function of the transverse acceleration and as a function of whether the vehicle is braked or unbraked through a braking intervention by monitoring the rotational wheel speed behaviour, wherein, in a case of a braked vehicle, a brake pressure is lowered at vehicle brakes of wheels on the inside of a turn. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. Method of estimating an overturn risk of a vehicle, in which a transverse acceleration of the vehicle is constantly determined and, as a function of a lateral acceleration, a rotational wheel speed behavior of the vehicle wheels is monitored, the method comprising the acts of:
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determining the overturn risk redundantly, specifically;
a) by precalculating a rolling motion of the vehicle to be expected by using the transverse acceleration (atrans) and b) as a function of whether the vehicle is braked or unbraked by monitoring the rotational wheel speed behavior,wherein, in the case of a braked vehicle, the braking pressure of a vehicle brake is lowered and it is assumed that an overturn risk exists when the rotational wheel speed of an assigned wheel increases only a little or not at all, and further wherein in the case of a braked vehicle, the braking pressure is lowered at vehicle brakes of wheels on the inside of a turn.
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Specification