Boots – shoes – and leggings
Patent
1992-05-18
1992-12-15
Teska, Kevin J.
Boots, shoes, and leggings
36442603, 364566, 180197, B60T 832, G01P 1508
Patent
active
051723182
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for generating different signals depending on whether a vehicle drives in a curve or on a straightaway and a method for determining the transverse acceleration while driving in curve.
From navigation systems it is known to determine the approximate driving direction of the vehicle from the difference .DELTA.v of the sensor signals from the non-driven wheels of a vehicle.
In anti brake lock control systems or anti slip control systems, it is also known to use steering angle sensors and/or transverse accelerometer and supply the output signals thereof as parameters to the control. The use of only the difference .DELTA.V is not sufficient in this case since interferences can adversely affect these differences and since different circumferential distances (wheel diameters) can also lead to incorrect statements.
According to the invention, the difference .DELTA.v between the speeds of the left and right non-driven wheels is filtered so that the filtered difference .DELTA.v.sub.F follows those changes having an increase greater than .+-. a with a delay, where a is about 0.2 g.
.DELTA.v.sub.F and the mean valve v.sub.M of the speed signals serve to form correction signals K.sub.i according to the relation: ##EQU1## where .DELTA.v.sub.g is a function which is stored and dependent upon the vehicle speed, and K.sub.2 is formed only when .vertline..DELTA.v.sub.F .vertline.>.DELTA.v.sub.G. A mean value K.sub.i is formed from the successively determined correction signals K.sub.i, and a corrected difference .DELTA.v.sub.k is formed from .DELTA.v.sub.F according to ride. A signal which indicates driving in a curve is generated if .DELTA.v.sub.K exceeds a small speed value.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is block diagram of a preferred embodiment;
FIG. 2 illustrates a variation of the diagram of FIG. 1;
FIG. 3 is a plot of the differential speed signal .DELTA.v.sub.G which is necessary to calculate the low speed correction signal, versus speed;
FIG. 4 is a plot of the corrected differential signal .DELTA.v.sub.K for different transverse accelerations, versus speed.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1 the sensors associated with the non-driven wheels bear the reference numerals 1 and 2 and the filters downstream thereof are referenced as 3 and 4. These filters are configured such that the output signals V.sub.LF and V.sub.RF of these filters can follow the wheel speed signals V.sub.L and V.sub.R of the sensors 1 and 2 only up to a maximum slope C of .+-.1.38 g, for example. A block 5 forms the difference .DELTA.V of the filtered signals. A block 6 forms the average value of the filtered signals ##EQU2## A block 7 serves to filter the differential signal .DELTA.V.
The filtering is configured such that the output signal .DELTA.V.sub.F of the filter 7 can follow the input signals .DELTA.V only up to a maximum slope of for example .+-.0.18 g. This measurement is based on the knowledge that faster changes of interferences cannot be caused by normal speed changes.
A correction signal K.sub.1 is formed in the blocks 8 and 9. For this purpose, the signals .DELTA.V.sub.F and V.sub.M are supplied to block 8. Moreover, the threshold value stage 9 activates this block 8 only if the speed V.sub.M (=vehicle speed) exceeds 100 km/h, for example. From the K.sub.1 -values which are determined in successive, short periods of time, a block 10 forms the mean value K.sub.1 which is then stored. At the twenty-first measurement, for example, the K.sub.1 -value reads: ##EQU3## It is also possible to interrupt the mean value formation after a certain number of values and use only the last determined mean value while driving.
The blocks 11-13 are used to determine the correction values K.sub.2. For this purpose, the signals .DELTA.V.sub.F and V.sub.M are supplied to the subtracting block, the dividing block, and the comparing block 12.
The expression ##EQU4## is formed when the threshold value stage 11 activates the block 12 at V.sub.M .ltoreq.
REFERENCES:
patent: 4085363 (1978-04-01), Gravina et al.
patent: 4530056 (1985-07-01), MacKinnon et al.
patent: 4566737 (1986-01-01), Masaki et al.
patent: 4669046 (1987-05-01), Kubo
patent: 4718013 (1988-01-01), Kubo
patent: 4849891 (1989-07-01), Krohn et al.
Meissner Manfred W.
Sigl Alfred
Park Collin W.
Robert & Bosch GmbH
Teska Kevin J.
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