Stick coil for igntion systems

Details Stick coil for igntion systems Stick coil for igntion systems

1999-09-13

2001-04-24

Gellner, Michael L. (Department: 2832)

Inductor devices

With outer casing or housing

C336S08400R, C336S096000, C336S083000

Reexamination Certificate

active

06222435

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a bar-type coil for ignition systems, in particular, a bar type coil for use as an ignition coil in internal combustion engines of motor vehicles according to the definition of the.
BACKGROUND INFORMATION
German Patent No. 41 32 851 describes a bar-type coil whose basic form is that of a cylindrical housing. Joined to the housing is a primary terminal having contact elements, which are electrically connected to winding ends of a coil assembly of the ignition coil arranged in the housing.
Disposed in a central position in the housing and within the coil assembly is a bar-shaped core of an open magnetic circuit. The coil assembly is concentrically surrounded by a longitudinally slotted magnetic return plate for directing the magnetic field.
During operation of the ignition coil, an interference energy is produced by an external partial discharging and acts, by way of capacitive re-charging processes, upon the primary terminal. The ignition-coil housing insulates the magnetic return plate from the spark plug shaft. The interference energy is dependent upon the electric field strength between the magnetic return plate and the spark plug shaft. Because of the installation location in the spark plug shaft, the interference energy is greater than in conventional ignition coils having a magnetic circuit that is closed over the core material.
The elevated interference energy, which may spread via the primary terminal and the lines connected thereto into the motor vehicle's electrical system, can cause unwanted degradations in the functions of other electrical components of the motor vehicle, such as a control unit or a radio receiver.
SUMMARY OF THE INVENTION
An advantage of a bar-type coil according to the present invention for ignition systems is that the deficiencies described above are avoided. This is achieved by configuring the bar-type coil with the magnetic return plate connected to the frame potential and diverting the charge carriers, which form and contribute to a partial discharging, to ground. This decreases the danger of malfunctions in electrical aggregates of the motor vehicle.
In certain cases, direct contact of the magnetic return plate with ground, leads to a voltage loss at the secondary side of the ignition coil carrying the high voltage. It is necessary to connect a resistance element having high enough resistance between the magnetic return plate and frame potential to avoid such a voltage loss.


REFERENCES:
patent: 5144935 (1992-09-01), Taruya et al.
patent: 5703556 (1997-12-01), Kikuta et al.
patent: 39 15 113 (1990-11-01), None
patent: 41 32 851 (1992-04-01), None
patent: 57 193776 (1982-11-01), None

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