Fluid-pressure and analogous brake systems – Speed-controlled – With yaw control
Reexamination Certificate
1998-08-04
2001-11-27
Graham, Matthew C. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
With yaw control
C303S009710
Reexamination Certificate
active
06322167
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for controlling braking force distribution in a vehicle.
BACKGROUND INFORMATION
European Patent No. 509,237 and its corresponding U.S. Pat. No. 5,281,012 describe a method and a conventional apparatus. Here, the difference is obtained between the fastest front wheel and the slowest rear wheel, and the brake pressure at the rear wheels is established in such a way that the velocity difference between the fastest front wheel and the slowest rear wheel assumes substantially a defined value. For braking operations in curves, the rear-axle brake pressure can be reduced to zero because the velocity difference becomes greater. Provision is therefore made, in the case of the known means of attaining the object, to limit the rear-axle braking pressure to a minimum value which depends on the curve radius, and to adapt the defined value for the velocity difference to the vehicle velocity.
Although these means of attaining the object satisfactorily solve the problem of braking in curves, it has been found that in some cases, especially at high curve velocities, it has limitations in terms of vehicle behavior, since a braking moment counterrotatory to the vehicle yaw moment is not generated.
SUMMARY OF THE INVENTION
An object of the present invention is to improve an electronic braking force distribution control system for braking operations in curves.
The means according to the present invention for attaining the object improve an electronic braking force distribution control system for braking operations in curves.
It is particularly advantageous that in the partial braking range, the tendency toward oversteer, when braking close to the limit curve velocity outside the ABS control range, decreases as a result of the braking moment which, in accordance with the present invention, is directed opposite to the yaw moment.
It is further advantageous that the braking force distribution control system according to the present invention is maintained even in the critical range of vehicle dynamics at high curve velocities (greater than 60 to 120 km/h).
It is further advantageous that the counterrotatory moment generated by the braking control system is not built up abruptly, but is available as the braking pressure defined by the driver increases. The vehicle is still sufficiently stabilized, while substantial advantages in terms of driving comfort result.
Moreover, advantageously, the means according to the present invention for attaining the object can be very easily adapted to different vehicles (sports cars, sedans, vans, etc.), since regulation occurs on the basis of the braking force distribution digram (adaptive behavior).
It is also advantageous that, as a result of the individual regulation of the rear axle as compared with the known “select low” regulation system, only half the pressure volume is displaced. This results in increased comfort, clearly perceptible by the driver, for pressure buildups over the entire velocity range.
It is further advantageous that no additional hardware is required in addition to the conventional (four-channel) ABS systems.
In particularly advantageous fashion, the means according to the present invention for attaining the object are utilized not only for hydraulic braking systems, but also for pneumatic and electrically controlled hydraulic and pneumatic braking systems, and for braking systems with brake application by electric motor.
REFERENCES:
patent: 4494801 (1985-01-01), Ohmori et al.
patent: 4637664 (1987-01-01), Arikawa
patent: 5282674 (1994-02-01), Matsuda
patent: 5482361 (1996-01-01), Buckhardt et al.
patent: 5641209 (1997-06-01), Kushi et al.
patent: 5813732 (1998-09-01), Monzaki et al.
patent: 6012010 (2000-01-01), Batistic et al.
patent: WO97/00749 (1997-01-01), None
Diehle Stefan
Meier Thomas
Pruhs Uwe
Graham Matthew C.
Kenyon & Kenyon
Robert & Bosch GmbH
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