Process for controlling the stability of vehicles
AssigneeRobert Bosch GmbH
InventorsUwe Hartmann, Anton van Zanten
Life of this patent
Estimating the term…
Abstract
A lower limiting value of the yaw speed is calculated as a function of the steering angle, the vehicle speed, and the coefficient of friction between tires and road. If the yaw speed falls below the lower limiting value, the brake pressure is reduced in order to increase lateral stability.
Claims22
A process for controlling stability of a vehicle during travel through curves, said process comprising the steps of:
- determining steering angle .delta., vehicle yaw speed .PHI., vehicle forward speed v.sub.F, and coefficient of friction .mu. between tires and road;
- calculating a lower limiting value curve of the yaw speed .PHI. as a function of the steering angle .delta. and in dependence upon the vehicle speed v.sub.F and the coefficient of the friction .mu.;
- and
- reducing brake pressure if the yaw speed falls lower limiting value curve.
The process in accordance with 6, further comprising the step of prescribing a lower limiting value curve based on segments of a straight line ##EQU13## within a range which is between the range determined by V.sub.F .delta./L and the range from .delta.max onward;
- wherein
- K.sub.Ph is a constant, ##EQU14## K.sub.b is a constant, .PHI.max=.mu..sub.o (-a).sub.max, and K.sub..mu.o is a constant.
A process for controlling stability of a vehicle during travel through curves, said process comprising the steps of:
- determining steering angle .delta., vehicle yaw speed .PHI., vehicle forward speed v.sub.F and coefficient of friction .mu. between tires and road;
- calculating a desired value curve of the yaw speed .PHI. as a function of the steering angle .delta. and in dependence upon the vehicle speed v.sub.F and the friction coefficient .mu.;
- and
- adjusting brake pressure to vary the actual yaw speed toward the desired value curve by one of increasing or decreasing the brake pressure.
Dependencies are inferred from the claim text.