Ignition system for an internal combustion engine

Details Ignition system for an internal combustion engine Ignition system for an internal combustion engine

1999-11-02

2001-05-08

Solis, Erick (Department: 3747)

Internal-combustion engines

High tension ignition system

Having a specific ignition coil

C123S635000

Reexamination Certificate

active

06227186

ABSTRACT:

BACKGROUND INFORMATION
German Patent No. 39 20 080 described an ignition system for an internal combustion engine in which a spark plug is inserted into a spark-plug compartment (well) of a cylinder head of the internal combustion engine.
A cylinder-head cover is placed on the cylinder head, with the interposition of a gasket. Above the spark-plug compartment, the cylinder-head cover has an installation opening into which is inserted an ignition coil that is connected to the spark plug by way of a connecting plug.
If spray water, e.g. from a high-pressure cleaner, acts upon the ignition coil, this water can get through the installation gap into the installation opening, and from there into the spark-plug compartment. This can occur in particular when the cylinder head is heated to above 100° C. due to the operation of the internal combustion engine, and, during the standstill phase of the internal combustion engine, is cooled off to the ambient temperature. In so doing, the air volume in the spark-plug compartment and the installation opening contracts; an underpressure develops which evens out due to advancing air and moisture along the contact area of the ignition coil. The moisture thus introduced forms a liquid pool around the spark plug, and can impair the high-voltage transmission of the ignition coil, which can result in malfunctions of the ignition system.
SUMMARY OF THE INVENTION
In contrast, the ignition system of the present invention for an internal combustion engine has the advantage that the above-mentioned shortcoming is avoided to a satisfactory degree.
To that end, in the ignition system, the ignition coil is inserted, in a sealed manner, into the installation opening of the cylinder-head cover, thus preventing the entrance of water along the installation opening. In addition, the compartment having the spark plug is vented via a ventilating system of the ignition coil, so that no underpressure can occur any longer in the compartment when the internal combustion engine cools off, and thus there is no suction effect on the water present at the ignition coil.
Water, which because of unfavorable conditions such as the direct blasting of the ignition coil with a high-pressure cleaner, finds a way in small quantities through the ventilation system, is collected in a storage device of the ventilation system, and with the heating of the internal combustion engine during its operation, is evaporated and released.
In this manner, a particularly operationally-reliable ignition system is implemented.


REFERENCES:
patent: 5261381 (1993-11-01), Sugiura et al.
patent: 5462023 (1995-10-01), Furuya
patent: 5628298 (1997-05-01), Murata
patent: 5771870 (1998-06-01), Satou et al.
patent: 5842458 (1998-12-01), Alstrin et al.
patent: 5870012 (1999-02-01), Sakamaki et al.
patent: 39 20 080 (1991-01-01), None

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