Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Patent
1997-09-25
1999-10-19
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 72, G01P 342
Patent
active
059681055
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method of determining the transverse acceleration of a vehicle, in particular as an input quantity for an electronic vehicle control system, e.g., for an anti-lock system (ABS), a traction slip control system (TCS), an electronic control system for brake force distribution (EBV), an active suspension control system or a driving stability control system (DSC).
It is easily comprehensible that in some situations the control quality may be improved considerably by taking the transverse acceleration into account in the calculation of the control quantities. A dangerous situation in terms of driving stability may be determined prematurely from the transverse acceleration. Cornering and the direction of cornering can also be seen at once in the transverse acceleration. Some control systems, such as driving stability control systems, are unable to function without a measurement of transverse accelerations.
Further, the knowledge of the instantaneous transverse acceleration permits monitoring other components and sensors of a control system. For example, the function of a separate transverse acceleration transducer or a steering angle emitter may be checked by the calculated transverse acceleration. If the control system determines and takes into account the different rolling circumferences of the individual wheels by correction factors, measuring the transverse acceleration permits monitoring the determination of the correction factors.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a method which permits determining the transverse acceleration of a vehicle in a simple manner, by little structure and a great degree of reliability.
It has been found that this object may be achieved by the method described in the attached claim 1.
In a preferred aspect of the present invention, a long-time average value of the difference between the long-time correction factor and the short-time correction factor of the respective wheel is produced in the filtering and adapting circuit by a low-pass filter. A partial value of the long-time average value is evaluated as a function of the long-time average value of the other wheels for the correction of the long-time correction factor.
Thus, according to the present invention, the transverse acceleration of the vehicle is calculated exclusively from the data supplied by the wheel sensors about the rotational behavior of the individual vehicle wheels. If a control system is used, as is conventional practice nowadays, wherein the calculations and data processing operations are performed by programmed circuits, such as microprocessors, microcontrollers, etc., no additional hardware is required for the calculation of the transverse acceleration according to the present invention. Any additional structure is limited to an extension of the program and the associated memories, if necessary.
Compared to conventional systems using special sensors, such as transverse acceleration sensors and/or steering angle emitters, etc., the calculation of the transverse acceleration by use of the method of the present invention is extremely exact because the calculation is based on the determination of the wheel speed differences in consideration of the short-time correction factors and the long-time correction factors.
Further details of the present invention can be seen in the following description of embodiments, making reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings,
FIG. 1 is a schematically simplified diagram or principle view of a circuit for implementing the method of the present invention.
FIG. 2 is a view, similar to the illustration of FIG. 1, of further details of a circuit for determining the short-time correction factor and the long-time correction factor according to the circuit of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
The circuit of FIG. 1 serves to illustrate the method of the present invention. The method is based on determining
REFERENCES:
patent: 5179526 (1993-01-01), Zimmer et al.
patent: 5299131 (1994-03-01), Haas et al.
patent: 5711712 (1998-01-01), Graf
English translation of the International Preliminary Examination Report for appl. No. PCT/EP95/02950 filed Jul. 26, 1995.
Burkhard Dieter
Dornseiff Manfred
Schwartz Jean-Claude
Volz Alexander
Cuchlinski Jr. William A.
Donnelly Arthur
ITT Manufacturing Enterprises Inc.
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