Method and device for detecting the overturning hazard of a motor vehicle
First Claim
1. Method of preventing rollover of a cornering vehicle which comprises at least one axle and at least two wheels, the vehicle being equipped with a transverse acceleration sensor which senses the transverse acceleration that occurring at the center of gravity of the vehicle in the horizontal plane of the vehicle, comprising the steps of:
- detecting the component of the transverse acceleration which generally acts in the horizontal plane of the vehicle is detected during cornering by the transverse acceleration sensor means, determining a condition variable which is correlated to the centrifugal acceleration that acts on the center of gravity, calculating the roll angle of the vehicle from the difference between the detected component of the transverse acceleration and the determined centrifugal acceleration, weighting the result of the roll angle calculation with a factor comparing the weighted roll angle with a critical roll angle, and introducing a stabilizing act on the vehicle when the critical roll angle is exceeded by way of influencing the wheel torque.
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Abstract
The present invention relates to a method of detecting the roll angle of a cornering vehicle which comprises at least one axle and at least two wheels, the vehicle being equipped with a transverse acceleration sensor means which senses the transverse acceleration that acts on the center of gravity of the automotive vehicle generally in the horizontal plane of the vehicle. To provide a method which does not require an additional sensor means and is virtually independent of given vehicle characteristics or dimensions, the component of the transverse acceleration which essentially acts in the horizontal plane of the vehicle is detected by the transverse acceleration sensor means during cornering. In addition, a condition variable which is correlated to the centrifugal acceleration acting on the center of gravity is detected, and the roll angle of the vehicle is calculated from the difference between the detected component of the transverse acceleration and the determined centrifugal acceleration, the said difference being weighted with a factor.
127 Citations
16 Claims
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1. Method of preventing rollover of a cornering vehicle which comprises at least one axle and at least two wheels, the vehicle being equipped with a transverse acceleration sensor which senses the transverse acceleration that occurring at the center of gravity of the vehicle in the horizontal plane of the vehicle, comprising the steps of:
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detecting the component of the transverse acceleration which generally acts in the horizontal plane of the vehicle is detected during cornering by the transverse acceleration sensor means, determining a condition variable which is correlated to the centrifugal acceleration that acts on the center of gravity, calculating the roll angle of the vehicle from the difference between the detected component of the transverse acceleration and the determined centrifugal acceleration, weighting the result of the roll angle calculation with a factor comparing the weighted roll angle with a critical roll angle, and introducing a stabilizing act on the vehicle when the critical roll angle is exceeded by way of influencing the wheel torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Device for preventing rollover of a cornering vehicle which includes at least one axle and at least two wheels, the vehicle being equipped with a transverse acceleration sensor means which senses the transverse acceleration that occurs at the center of gravity of the automotive vehicle in the horizontal plane of the vehicle, comprising:
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transverse acceleration sensor for detecting the component of the transverse acceleration which generally acts in the horizontal plane of the vehicle, means for determining a condition variable which is correlated to the centrifugal acceleration that acts on the center of gravity, means for calculating the roll angle of the vehicle from the difference between the detected component of the transverse acceleration and the determined centrifugal acceleration, the difference being weighted with a factor, means for comparing the calculated roll angle with a critical roll angle, and means for performing an intervention that stabilizes rollover on the vehicle when the critical roll angle is exceeded by way of output signals in order to influence the brake or the torque. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
means for determining the difference of the wheel speeds on at least two axles, means for calculating the condition variable correlated to the centrifugal acceleration from at least two determined wheel speed difference data, means for comparing the so obtained condition variables and for performing a plausibility analysis.
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13. Device as claimed in claim 12, further including means for comparing the algebraic signs of the roll angle and of the measured transverse acceleration for correction in the event of an inclined roadway.
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14. Device as claimed in claim 9, further including means for weighting the critical roll angle with the current center of gravity of the vehicle.
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15. Device as claimed in claim 9, further including means for weighting the critical roll angle with the current centrifugal acceleration.
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16. Device as claimed in claim 9, further including means for an earlier detection of a developing critical roll angle.
Specification