Fluid-pressure and analogous brake systems – Speed-controlled – And traction control
Reexamination Certificate
1999-01-22
2001-06-12
Schwartz, Christopher P. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
And traction control
36
Reexamination Certificate
active
06244673
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and a device for traction control in a motor vehicle.
BACKGROUND INFORMATION
German Patent No. 20 49 262 describes a traction control device for a motor vehicle, where the braking pressure on a driving wheel is increased by an anti-lock device when this wheel tends to spin, thus reducing the tendency to spin and allowing the vehicle to start moving. To increase the pressure, the driver is expected to actuate the brake pedal, so that the braking pressure built up by the driver is used for increasing the wheel brake pressure via appropriate control of a valve arrangement. In addition, this traction control is intended to be performed only if a switch that closes when the accelerator is depressed has been actuated.
If such a traction control is active, the braking action cannot be built up immediately if the driver suddenly wishes to brake, since the connection between the main brake cylinders, i.e., the service brake valve, and the wheel brakes of the unregulated wheels must be blocked.
SUMMARY OF THE INVENTION
An object of the present invention is to provide measures to improve traction control, in terms of availability of the braking system, in which the required braking pressure for braking at least one driving wheel must be applied via actuation of a pedal by the driver.
A simple method capable of being implemented without additional measures is proposed to help the vehicle start moving, with whose help a differential blocking effect is achieved. It is particularly advantageous that the performance of the traction control is restricted to the start phase, so that outside the given operating phase the vehicle can be braked immediately if the driver so wishes. Critical driving situations are thus effectively avoided.
According to the present invention, in addition to acting on the brakes to prevent at least one driving wheel from spinning, the engine is also acted upon in order to reduce the torque when at least one driving wheel starts to spin. It is advantageous that this action on the engine, like the action on the brakes, depends on the presence of conditions required for braking.
In another aspect of the present invention, the presence of drive slip and thus of the need for activating the traction control is indicated to the driver in a suitable manner, for example, via a light, a buzzer, or the like.
It is particularly advantageous that, depending on the application, different control principles can be used. By comparing the rotation speed of the driving wheels, a differential locking effect can be advantageously achieved, and braking pressure can be built up if the wheel rotation speeds differ from one another in an unallowable manner. Furthermore, the traction control can be activated if a wheel rotation speed differs from a predefined reference value by an unallowable amount.
REFERENCES:
patent: 5139115 (1992-08-01), Browne et al.
patent: 5325300 (1994-06-01), Tsuyama et al.
patent: 5593217 (1997-01-01), Schmitt et al.
patent: 5713642 (1998-02-01), Okazaki
patent: 5732380 (1998-03-01), Iwata
patent: 20 49 262 (1972-04-01), None
Konrad Werner
Ziegler Andreas
Kenyon & Kenyon
Robert & Bosch GmbH
Schwartz Christopher P.
LandOfFree
Method of and device for traction control in a motor vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and device for traction control in a motor vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and device for traction control in a motor vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2494411