Boots – shoes – and leggings
Patent
1994-09-06
1996-07-16
Teska, Kevin J.
Boots, shoes, and leggings
364565, 364566, 364569, 73116, 731173, 324176, 324178, 324169, 341 11, 341 6, G06G 776, G01P 342
Patent
active
055373224
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention proceeds from a device according to the generic part of the main claim.
Devices for determining the speed gradient dn/dt or ngrad of an internal combustion engine are already known. For example, it is known from DE-PS 34 21 640 to calculate the speeds of the engine from the intervals between pairs of speed-dependent pulses and to determine a value for the change in speed, i.e. a speed gradient, from at least two speeds calculated in this manner.
However, the known device has the disadvantage that the calculation of the speed gradient in the control device and the calculations required for controlling or regulating the internal combustion engine are carried out at the same time so that the computing device of the control device is highly loaded, especially during particularly time-critical phases.
ADVANTAGES OF THE INVENTION
The device according to the invention for determining the speed gradient dn/dt with the characterizing features of the main claim has the advantage over the device known from the prior art that loading of the computer is reduced in that the data required for controlling and regulating the internal combustion engine are calculated in a time-critical phase and the speed gradients dn/dt or ngrad are determined in a phase which is not time-critical.
This separate calculation, which is possible because the speed gradient need not be calculated as often as other parameters, is advantageously improved in that the calculation of the speed gradient dn/dt is effected in a particularly simple manner and the speed n, which is calculated in any case, and the segment times t.sub.seg (i) and t.sub.seg (i-1), which are also determined in any case, are used for the calculation.
Further advantages of the invention follow from the features of the subclaims.
DRAWING
FIG. 1 is a view showing a known device used in motor vehicles for detecting speed and for controlling an internal combustion engine and which can also be used to realize the present invention;
FIG. 2 is a view showing a signal curve produced by the device in accordance with the present invention;
FIG. 3a is a flow chart illustrating a sequence of individual steps carried out in a time-critical computing grid in a segment cycle; and
FIG. 3b is a flow chart illustrating the determination of a speed gradient dn/dt or ngrad in accordance with a program which is run in not time-critical phases.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
A device suitable for carrying out the process according to the invention is shown in FIG. 1. An increment disk 10 having a plurality of identical angle marks 11, e.g. 60-2, at its surface is attached to a shaft 12 whose speed and change in speed are to be determined. This shaft is the crankshaft of an internal combustion engine in the selected embodiment example.
All of the angle marks 11 of the increment disk 10 are arranged at an identical distance from one another. A reference mark which is formed in the embodiment example shown in the drawing as an absent mark and is also known as a synchronous gap is designated by 13.
With a suitably adapted increment disk, the speed gradient for another shaft, e.g. the camshaft, could also be determined. The increment disk could also be replaced by another disk with at least one angle mark.
Further, a segment disk with one angle mark per cylinder can be used for determining the speed gradient of the camshaft or in a corresponding manner with one angle mark per number of cylinders/2 in the crankshaft.
As concerns the increment disk already mentioned, which is connected with the crankshaft of an internal combustion engine, two segments 14 are required, as is well known, for producing suitable trigger marks in a four-cylinder internal combustion engine. Accordingly, in a disk with 60-2 angle marks, a segment would extend over 30 marks.
In a six-cylinder internal combustion engine, three segments would be required; in a disk with 60-2 marks, a segment would accordingly extend over 20 marks.
The increment disk 10 which rotates, for example, in the dire
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Boettcher Klaus
Denz Helmut
Mallebrein Georg
Tischer Christian
Wild Ernst
Louis-Jacques Jacques H.
Robert & Bosch GmbH
Striker Michael J.
Teska Kevin J.
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