The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 1985
Filed:
Feb. 06, 1984
Dieter Betz, Vaihingen, DE;
Jorg Issler, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To provide ignition energy to respective spark plugs of a multi-cylinder internal combustion engine (ICE) without a distributor, winding groups, each including a primary and secondary winding, are located on respective core portions of an iron core, which core portions are coupled together by zones (a, b, c) of high magnetic reluctance, or low magnetic flux conductivity; the winding groups can be located on L cores (16, 17) with two high-reluctance gaps between the ends of the facing L cores (FIG. 1) or on a common U core (28, 30, 29) with a cross yoke (31) spaced from the ends of the legs of the U. Interruption of current flow through the primary of any one of the winding groups will then not induce in the secondary of the other winding group a voltage high enough to cause spark-over at the other secondary; free-wheeling diodes (14, 22), connected across the primaries, can suppress current flow in the primary not being interrupted; and diodes (12, 13; 25, 26), serially connected with spark plugs, likewise suppress spurious spark-over.