Device for recognising the angular position of a rotating part

Internal-combustion engines – Charge forming device – Fuel injection system

Patent

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Details

73116, F02P 706, F02D 4100, G01D 5249

Patent

active

054977487

DESCRIPTION:

BRIEF SUMMARY
STATE OF THE ART

The invention is based on a device for recognising the angular position of a rotating part. Such a device is used, in particular, for rotational speed and angular information for control units in internal combustion engines, in particular ignition and fuel injection controls, in which both the rotational speed and the angular information can be recorded by means of a single pick-up. The points in time required for the ignition and/or injection are calculated from the angular information.
Appliances for recording the angular position of a rotating part are already known. Such an appliance is described, for example, in EP 0 188 433, in which a pick-up scans a pick-up disc which is connected to the crankshaft or camshaft of an internal combustion engine and which has evenly distributed, tooth-shaped angle marks on its periphery. In addition to the angle marks, there is also a reference mark which can, for example, be configured as a missing tooth, a larger gap between two teeth or a half-tooth on the rotating part.
The pick-up, which is configured as an inductive perception head, supplies a signal which is formed into a rectangular signal in a processing circuit and is analysed in a subsequent microcomputer. The recognition of the reference mark takes place by means of sequentially occurring time comparisons, the recognition then taking place when a short time is followed by a longer time, and this again is followed by a shorter time.
The known appliance has the disadvantage that a multiplicity of teeth, for example 180, are provided, the determination of the number of teeth being optimised in such a way that the time intervals between similar angle mark flanks can still be rationally analysed.
Another appliance for recording the angular position of a rotating part is known from EP 00 13 846. In this, a pick-up disc is used which has 32-2 markings on its surface, the two missing markings again being used as the reference mark. This pick-up disc has the disadvantage that the number of markings permits no fixed reference to the position of the individual cylinders if the number of cylinders is 3, 6 or 12. For this reason, the known pick-up disc cannot be universally employed.


ADVANTAGES OF THE INVENTION

The device according to the invention has, in contrast, the advantage over known appliances or devices that the special number of markings or teeth on the pick-up disc permits a fixed relationship between the marking and the position of the individual cylinders for all usual numbers of cylinders and, therefore, permits simple analysis. This is possible because 36 can be divided by 2, 3, 4, 6 and also 12. In the case of 8-cylinder engines, two cylinder banks are formed and the allocation therefore corresponds to that of the 4-cylinder engine.
Advantageous embodiments of the pick-up disc are given which permit a particularly simple analysis.


BRIEF DESCRIPTION OF THE DRAWINGS

An embodiment example of the invention is shown in the drawing and is explained in more detail in the following description.
FIG. 1 shows the fundamental structure of the pick-up system including a subsequent analysis circuit.
FIGS. 1a and 1b show possible embodiments of the pick-up disc and
FIG. 2 shows the variation of the voltage with time.


DESCRIPTION OF THE EMBODIMENT EXAMPLE

In the embodiment example shown in FIG. 1, a pick-up disc 10 is illustrated which has a multiplicity of angle marks 11, which are configured as rectangular teeth, on its surface. Furthermore, the pick-up disc 10 has a reference mark gap 12 which consists of two missing angle marks.
In the embodiment example, the number n of angle marks is 36-2; this number n permits particularly simple analysis possibilities.
The pick-up disc 10 is connected to the crankshaft 13 of an internal combustion engine; it is also possible to configure the toothed belt pulley appropriately and to use it as the pick-up disc.
The pick-up disc 10 is scanned by means of a sensor 15, for example an inductive sensor or a Hall sensor, which is connected to an analysis cir

REFERENCES:
patent: Re34183 (1993-02-01), Wilens et al.
patent: 4152655 (1979-05-01), Przybyla et al.
patent: 4321580 (1982-03-01), Deleris
patent: 4338903 (1982-07-01), Bolinger
patent: 4459968 (1984-07-01), Brandt et al.
patent: 4528471 (1985-07-01), Baumann
patent: 4553426 (1985-11-01), Capurka
patent: 4553427 (1985-11-01), Kuraoka et al.
patent: 4742332 (1988-05-01), Schroeder et al.
patent: 4797827 (1989-01-01), Cockerham
patent: 4899281 (1990-02-01), Grimaud et al.

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