Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Patent
1998-11-25
2000-08-29
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
701 74, 701 75, 303171, 303173, 180197, G06F 700, G06F 1700
Patent
active
061121460
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates a method and an apparatus for determining a variable describing vehicle speed.
BACKGROUND INFORMATION
German Patent Aplication No. 38 33 212 (corresponding to U.S. Pat. No. 5,272,634) describes, for a vehicle driven at a single axle and equipped with an antilock braking control system, the creation of a reference variable for the vehicle speed outside the braking pressure control system. This is done essentially by determining an averaged wheel speed on the basis of the speeds of the two driven wheels. If the derivative over time of this averaged wheel speed is greater than zero, the reference variable is defined by the speed of the slower of the two driven wheels. If the derivative over time of this averaged wheel speed is less than zero, the reference variable is then defined by the speed of the faster of the two driven wheels. The slope of the reference variable for the vehicle speed is thus limited to a maximum value.
German Patent Application No. 40 09 195 (corresponding to U.S. Pat. No. 5,364,174) describes, for an antilock braking control system used in an all-wheel-drive vehicle, the creation of a reference speed required for traction control. In this context, the reference speed is essentially defined by the speed of the slowest wheel in the case of a speed increase, and by the speed of the third-fastest wheel in the case of a speed decrease. In the transition region between increase and decrease, the value attained by the slowest wheel speed is held constant. For the case where the speed of the third-fastest wheel deviates too greatly from an auxiliary reference speed, the reference speed is maintained concurrently with that auxiliary reference speed. The auxiliary reference speed is created by raising it by the speed of the third-fastest wheel, and decreasing it by the speed of the fastest wheel. It also is held constant in a transition region. If an instability exists due to incipient locking, the slope of the reference speed is defined by the slope of the auxiliary reference speed. If the wheels are slipping, the reference speed is held constant and the rise in the auxiliary reference speed is limited to a physically possible vehicle acceleration. If the rear wheels of the all-wheel-drive vehicle are decoupled from the drive system during braking, a slightly modified approach to creating the reference speed is used. Outside the control system, the reference speed is raised if the speeds of all the wheels are greater than it. If two or three wheels are faster than the reference speed, it is held constant. If none or only one of the wheels is faster than the reference speed, the reference speed is set downward.
Systems for controlling brake slip or traction are known in general form, for example from the book "Bremsanlagen fur Kraftfahrzeuge" (Braking Systems for Motor Vehicles) published by Robert Bosch GmbH Stuttgart (VDI-Verlag, Dusseldorf, 1st edition 1994).
An object of the present invention is to improve the manner in which a variable describing the speed of a vehicle is determined.
SUMMARY OF THE INVENTION
An advantage of the method and the apparatus according to the present invention is that, the variable describing the speed of the vehicle can be determined for a vehicle driven in any fashion, i.e. for a vehicle with front-, all-, or rear-wheel drive, for any operating condition of the vehicle. The manner in which the variable describing vehicle speed is determined is independent of whether a control system implemented in the vehicle--such as a brake slip control system or a traction control system, or for example a control system at a higher level than the brake slip or traction control system--is active while it is being determined. One example of such a higher-level control system that may be mentioned here as an example is the vehicle dynamics control system as known, for example, from the publication "FDR--die Fahrdynamikregelung von Bosch", (FDR--Bosch Vehicle Dynamics Control System), which is published in Automobiltechn
REFERENCES:
patent: 5272634 (1993-12-01), Leibbrand et al.
patent: 5364174 (1994-11-01), Becker et al.
patent: 5366282 (1994-11-01), Schmitt et al.
patent: 5419624 (1995-05-01), Adler et al.
patent: 5727852 (1998-03-01), Pueschel et al.
Arthur Gertrude
Cuchlinski Jr. William A.
Robert & Bosch GmbH
LandOfFree
Method and device for determining a variable describing the spee 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 and device for determining a variable describing the spee, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for determining a variable describing the spee will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1258611