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:
Jan. 27, 1981
Filed:
Jul. 02, 1979
Bernd Bodig, Leinfelden, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
When the current through the primary winding of an ignition coil of an ignition system in an internal combustion engine has increased to a predetermined value, base current for a power transistor connected in series with the coil is shunted away, causing a rise in voltage across the primary winding. When the voltage rise across the primary winding has reached a maximum allowable value less than the value required to cause the generation of a spark, the transistor is switched back to the fully conductive state. This cycle is repeated during the time the transistor would normally be conductive and terminates at the ignition time, that is at the time the transistor is blocked by the ignition timing circuit of the internal combustion engine to create the spark.