Rollover stability system including allowance for the steering angle
First Claim
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1. A method for rollover stabilization of a vehicle in critical driving situations, the method comprising:
- performing a stability algorithm, the stability algorithm using a sensor system to detect a critical rollover driving situation and using an actuator to intervene in a driving operation and stabilize the vehicle in a critical rollover driving situation for the vehicle;
one of activating and deactivating regulation intervention as a function of a control variable, wherein the control variable is calculated as a function of a measured transverse acceleration and a first variable which is a function of the steering angle and the longitudinal vehicle velocity, the first variable being supplied to one of a buffer device and a memory device, wherein the one of the buffer device and the memory device includes a counter whose output signal is weighted using a characteristic curve and used in calculating the control variable;
setting the counter to a predefined counter value when the first variable exceeds a first threshold value; and
after setting the counter to the predefined counter value, causing the counter to count backwards from the predefined counter value when the first variable drops below a second threshold value.
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Abstract
In a rollover stability method for a vehicle in a situation which is critical with respect to the driving dynamics, a critical rollover situation is detected by analyzing a control variable and the stabilization intervention is activated or de-activated as a function of the control variable. The regulation intervention is maintained even in driving situations featuring relatively low transverse acceleration if the control variable or a characteristic property of the stability algorithm is calculated as a function of the steering angle and/or the longitudinal vehicle velocity.
19 Citations
6 Claims
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1. A method for rollover stabilization of a vehicle in critical driving situations, the method comprising:
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performing a stability algorithm, the stability algorithm using a sensor system to detect a critical rollover driving situation and using an actuator to intervene in a driving operation and stabilize the vehicle in a critical rollover driving situation for the vehicle; one of activating and deactivating regulation intervention as a function of a control variable, wherein the control variable is calculated as a function of a measured transverse acceleration and a first variable which is a function of the steering angle and the longitudinal vehicle velocity, the first variable being supplied to one of a buffer device and a memory device, wherein the one of the buffer device and the memory device includes a counter whose output signal is weighted using a characteristic curve and used in calculating the control variable; setting the counter to a predefined counter value when the first variable exceeds a first threshold value; and after setting the counter to the predefined counter value, causing the counter to count backwards from the predefined counter value when the first variable drops below a second threshold value. - View Dependent Claims (2, 3, 4, 5)
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6. A method for rollover stabilization of a vehicle in critical driving situations, the method comprising:
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calculating a first variable as a function of a steering angle and a longitudinal vehicle velocity; setting a current value of a counter to a predefined counter value whenever the first variable exceeds a first threshold; after setting the current value to the predefined counter value, causing the counter to count backwards from the predefined counter value when the first variable drops below a second threshold; calculating a control variable as a function of the current counter value and a measured transverse acceleration; and performing a stability intervention by using an actuator to intervene in a driving operation and stabilize the vehicle in a critical rollover driving situation for the vehicle, wherein the performing of the stability intervention is conditioned upon the control variable exceeding a predefined activation threshold.
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Specification