Boots – shoes – and leggings
Patent
1985-11-12
1987-12-22
Harkcom, Gary V.
Boots, shoes, and leggings
324176, 324178, G01P 342
Patent
active
047150092
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a device for determining angular position of a rotating disk having on its circumference a plurality of uniformly distributed angle markers and at least one reference marker, the device including a sensor of the markers, and a counter of output pulses from the sensor. Such devices give information about rotational speed and angular position of a rotating part, and are used for control devices in internal combustion engines, in particular for ignition and fuel injection controls. They have the advantage that both parameters can be picked up with a simple transmitter. Such devices are known, for example, from DE-OS No. 23 57 061, DE-OS No. 29 39 643, DE-OS No. 29 39 643, GB No. 2,065,310, DE-OS No. 30 11 822 as well as from U.S. Pat. No. 4,321,580, wherein different possibilities are indicated to provide a reference marker between the angle markers which are uniformly distributed over the circumference of a transmitter. The angle markers are usually designed in form of teeth, whereby the reference marker may be a missing tooth, a wider or smaller tooth or tooth distance, a slotted, beveled, halved or milled tooth, a tooth made from a different material or a half tooth in the transverse direction.
The picking up of the reference markers is known from GB No. 2,065,310 as well as from U.S. Pat. No. 4,321,580 in form of a counter which counts a cycle frequency. The counter can change its counting direction either at a defined flank of a tooth (front or rear flank), or it can be set for a determined counting value. Therefore, the counter operates synchronously with respect to the angle markers and is therefore exclusively used for this purpose.
ADVANTAGES OF THIS INVENTION
In contrast thereto, the device in accordance with the present invention is advantageous in that neither counter synchronizations have to be performed with the angle marker flanks, nor any frequency multiplications or similar PLL-like processes have to be made. Since the counter is completely free running and synchronously counts the angle markers, it may be additionally used for other purposes. The information concerning the instantaneous rotational speed of the rotating part is present at any time without any special measures.
Due to the measures stated in the subclaims advantageous further embodiments and improvements of the device stated in the main claim are made possible. Particularly advantageous is the simultaneous evaluation of three successive difference values which are recovered from storage values, whereby a reference marker is recognized when the mean difference value deviates from the other two by a predetermined magnitude. Thus, an erroneous recognition of a reference marker caused by torsion, vibration or rotational speed dynamics can be prevented. Furthermore, it is also possible to subsequently correct a displacement of the angle reference by an increment after, early or late, with the aid of the three measured difference values.
DRAWING
One exemplified embodiment of the invention is illustrated in the drawings and explained in more detail in the following description.
FIG. 1 illustrates the block diagram of an exemplified embodiment and;
FIG. 2 illustrates a signal diagram explaining the mode of operation.
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENT
A disk-shaped rotating part 10 which is preferably connected with the crankshaft or the cam shaft of an internal combustion engine is provided with tooth-shaped angle markers 11 which are uniformly distributed over the circumference thereof. A reference marker 12 is provided between two angle markers either as a missing tooth or a larger gap. Naturally, the reference marker may be shaped differently, for example, in accordance with one of the embodiments of the aforementioned state of the art. An inductive pick-up unit or receiver 13 scans the angle markers 11, whereby the induced signal is shaped as a rectangular signal in a preparation circuit 14 which is structured as a comparator, for example.
In addition to the inductive pic
REFERENCES:
patent: 4356447 (1982-10-01), Honig et al.
patent: 4449191 (1984-05-01), Mehnert
patent: 4506339 (1985-03-01), Kuhnlein
Bohmler Heinz
Daumer Rolf
Mayer Dieter
Perenthaler Egbert
Harkcom Gary V.
Herndon H. R.
Robert & Bosch GmbH
Striker Michael J.
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