Rollover stability system including allowance for the steering angle

• US 20050143885A1
• Filed: 11/18/2004
• Published: 06/30/2005
• Est. Priority Date: 12/05/2003
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Nardi, Flavio, Samsons, Andris, Hey, Matthias, Nimmo, Matthew, Dzumaryk, Christopher
• Granted Patent: US 7,788,006 B2
• Time in Patent Office: Days
• US Class Current: 701/38
• CPC Class Codes: B60G 17/0162 mainly during a motion involving steering operation, e.g. cornering, overtaking B60G17/0164 takes precedence
• CPC Class Codes: B60G 17/0195 characterised by the regulation being combined with other vehicle control systems conjoint control of vehicle sub-units including control of suspension systems B60W10/22
• CPC Class Codes: B60G 2800/702 Improving accuracy of a sensor signal
• CPC Class Codes: B60G 2800/9124 Roll-over protection systems, e.g. for warning or control
• CPC Class Codes: B60R 16/0234 related to maintenance or repairing of vehicles
• CPC Class Codes: B60W 2030/043 about the roll axis
• CPC Class Codes: B60W 2510/20 Steering systems
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2520/125 Lateral acceleration
• CPC Class Codes: B60W 2540/18 Steering angle
• CPC Class Codes: B60W 30/04 related to roll-over prevention

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.

Claims

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; and

one of activating and deactivating regulation intervention as a function of a control variable,

wherein at least one of (a) the control variable and (b) a characteristic property of the stability algorithm is a function of at least one of a steering angle and a longitudinal vehicle velocity.

2. The method according to claim 1, further comprising determining the control variable as a function of the steering angle, the longitudinal vehicle velocity and a measured transverse acceleration.

3. The method according to claim 1, wherein the control variable is a function of at least one of (a) a change in a transverse acceleration and (b) another parameter characterizing a driving response of the vehicle.

4. The method according to claim 1, wherein the control variable is a function of a transverse acceleration, which is computed on the basis of Ackermann'"'"'s equation.

5. The method according to claim 1, further comprising calculating the control variable on the basis of a variable which is a function of the steering angle and the longitudinal vehicle velocity, the variable being supplied to one of a buffer device and a memory device, whose output signal is used in calculating the control variable.

6. The method according to claim 5, wherein the memory device includes a counter.

7. The method according to claim 6, further comprising weighting an output value of the counter using a characteristic curve.

8. An electronic stability system for rollover stability of a vehicle in critical driving situations, the system comprising:

a control unit for storing a stability algorithm;

a sensor system for detecting instantaneous actual values of a regulation; and

an actuator for performing a stability intervention,

wherein the stability algorithm is one of activated and de-activated as a function of a control variable, and

wherein at least one of (a) the control variable and (b) a characteristic property of the stability algorithm is a function of at least one of a steering angle and a longitudinal vehicle velocity.

9. The electronic stability system according to claim 8, wherein the control variable is a function of a transverse acceleration, which is calculated on the basis of Ackermann'"'"'s equation.

10. The electronic stability system according to claim 8, further comprising at least one of a buffer device and a memory device, wherein the control variable is calculated on the basis of a variable which is a function of the steering angle and the longitudinal vehicle velocity, the variable being supplied to one of the buffer device and the memory device whose output signal is used in the calculation of the control variable.