Process for increasing the controllability of a vehicle

• US 5,188,434 A
• Filed: 06/03/1991
• Issued: 02/23/1993
• Est. Priority Date: 12/01/1988
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hartmann, Uwe, Van Zanten, Anton, Kost, Friedrich, Ruf, Wolf-Dieter
• Primary Examiner(s): Oberleitner, Robert J.
• Assistant Examiner(s): Muratori, Alfred
• Application Number:
  US07/687,877
• Time in Patent Office: 631 Days
• Field of Search: 364/426.01-426.03, 303/91, 303/100, 303/102, 303/103, 303/111, 303/113 SS, 303/113 AP
• US Class Current: 303/146
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02

Abstract

A brake-pressure controller regulates the brake pressure on the individual wheels according to the instantaneous slip values in comparison with variable desired slip values. The angle of inclination of one wheel of each axle is determined, and the desired slip values are varied as a function of these angles of inclination with the effect of a better vehicle controllability.

Claims

1. Method of stabilizing a vehicle having a front axle with two wheels, a rear axle with two wheels, and means for controlling brake pressure at each wheel, each wheel exhibiting an instantaneous brake slip and an angle of inclination, said method comprising

determining the instantaneous brake slip for each wheel,

comparing the instantaneous slip at each wheel to a desired slip value,

determining the angle of inclination for at least one wheel of each axle,

varying the desired slip value for each wheel in dependence upon the angles of inclination, and

controlling the brake pressure at each wheel so that the instantaneous brake slip for each wheel conforms to the desired slip value for the respective wheel.

2. Method as in claim 1 wherein when the brake pressure is less than a predetermined amount, the desired slip is increased.

3. Method as in claim 1 wherein, when the vehicle moves through a curve having an inside and an outside, and when one wheel of each axle has an angle of inclination with the same sign, and the angle of inclination of the wheel of the front axle is greater than the angle of inclination of the wheel of the rear axle, the desired slip value for the front wheel on the outside of the curve is reduced.

4. Method as in claim 1 wherein, when the vehicle moves through a curve having an inside and an outside, and when one wheel of each axle has an angle of inclination with the same sign, and the angle of inclination of the wheel of the rear axle is greater than the angle of inclination of the wheel of the front axle, the desired slip value for the rear wheel on the inside of the curve is reduced.

5. Method as in claim 1 wherein, when the vehicle moves through a curve having an inside and an outside, and when one wheel of each axle has an angle of inclination with the same sign, and the angle of inclination of the wheel of the rear axle is greater than the angle of inclination of the wheel of the front axle, the desired slip value for the front wheel on the outside of the curve is increased.

6. Method as in claim 1 wherein, when the vehicle moves through a curve having an inside and outside, and when the angle of inclination of one wheel of the front axle has a negative sign and the angle of inclination of one wheel of the rear axle has a positive sign, the desired slip values for wheels on the left side of the vehicle are reduced.

7. Method as in claim 1 wherein, when the vehicle moves through a curve having an inside and outside, and when the angle of inclination of one wheel of the front axle has a positive sign and the angle of inclination of one wheel of the rear axle has a negative sign, the desired slip values for wheels on the right side of the vehicle are reduced.

8. Method as in claim 1 wherein the angles of inclination of the wheels of the front axle have an upper limit.