Internal-combustion engines – High tension ignition system – Using capacitive storage and discharge for spark energy
Patent
1991-03-01
1991-12-17
Wolfe, Willis R.
Internal-combustion engines
High tension ignition system
Using capacitive storage and discharge for spark energy
123149C, 123149D, 310 70A, 310153, F02P 102, F02P 306, H02K 702
Patent
active
050727141
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
In capacitor ignition systems for internal combustion engines there is a need for at least two different levels of voltage, that is, one level for charging the capacitor component of the system and another for controlling the spark triggering electronic circuits. There is also often a need to provide a voltage for other electronic circuits which are not associated with the ignition system itself. It is difficult to combine in a simple and inexpensive manner a generator winding for e.g. charging said ignition capacitor and to provide at the same time a suitable control signal for the electronics controlling the spark discharge. In practice it is desirable for solving the above problem to use e.g. one single iron core carrying the necessary windings for generating a voltage for control as well as a voltage for charging. Hereby it is aimed at of course that the control voltage portion takes up as little winding space as possible in order to allow expansion of the other generator windings to the necessary extent. It is also desirable that it be possible to wind all windings in a simple manner in the same manufacturing operation.
PRIOR ART
The magnetic core legs, which are to carry the windings, are suitably arranged in star shape for coaction with the magneto wheel rotating thereabout. Such designs belong to prior art and in this connection reference can be made to the Swedish Patent No. 7806521-6 and the German Patent No. 32 23 039.
SUMMARY OF THE INVENTION
In an arrangement according to the present invention conveniently the magnet poles intended to cooperate with legs of a magnet core are arranged to move along a path or orbit with the core legs arranged in cooperation therewith. The magnet poles are spaced along the path and magnetized alternatingly with different polarity. The core legs are spaced in correspondence with the spacing of the magnet poles, and each core leg carries at least one winding, the windings being so interconnected that they electrically forms at least two groups. The one group comprises at least two windings on separate core legs connected such that the voltages induced, at a uniform magnetic flux through the legs, will cancel one another. The magnetic path is such that it exhibits at least one section of magnetic unsymmetry. The arrangement is suitably such that said one group, when passed by said section of the magnet pole path, will generate an induced voltage. The other group of windings are suitably so interconnected that they coact to generate a sum voltage including induction from symmetrical as well as unsymmetrical parts of the magnet pole path. The voltages just mentioned can be used advantageously in an associated ignition system for an internal combustion engine, the voltage of said first group controlling the ignition process and the voltage of said second group charging a capacitor included in the ignition system. By the present invention the advantage is attained that, from a manufacturing point of view, the generator as well as the control voltage section can be wound in essentially the same winding operation, and at the same time a properly adjusted charging voltage as well as control voltage can be generated.
The features characterizing the present invention will appear from the accompanying claims.
DESCRIPTION OF THE FIGURES
The invention will be described in greater detail with reference to the accompanying drawings which show diagrammatically the structure of an arrangement according to the invention.
FIG. 1 shows diagrammatically a lateral view of the generator arrangement in one position of rotation.
FIG. 2 shows the arrangement illustrated in FIG. 1 in a second position of rotation.
DESCRIPTION OF AN EMBODIMENT
The arrangement comprises a magneto flywheel 1 carrying seven magnets 2-8 distributed along three quadrants of the periphery of the flywheel. The fourth quadrant, i.e. the space between magnet pole 2 and magnet pole 8, contains no magnet pole, but the spacing of the remaining poles is such as if a magnet pole existed in said
REFERENCES:
patent: 3495579 (1970-02-01), Davalillo
patent: 4259938 (1981-04-01), Johansson
patent: 4418677 (1983-12-01), Hofmann
patent: 4591746 (1986-05-01), Kamiyama
patent: 4636671 (1987-01-01), Terada
patent: 4892079 (1990-01-01), Umezu et al.
Agren Anders
Bengtsson Jorgen
AB Svenska Eketromagneter
Wolfe Willis R.
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