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:
Aug. 01, 1978
Filed:
Apr. 05, 1976
Nissan Motor Company, Ltd., , JP;
Abstract
In a spark-ignited internal combustion engine having a plurality of combustion chambers, at least one combustion chamber is intentionally caused to misfire either periodically or continuously to increase the amount of unburned fuel in the exhaust gas when the temperature in the thermal reactor drops excessively during, e.g., idling of the engine. An ignition system for performing the method has a supplementary ignition primary circuit which is normally disconnected from the ignition coil primary, but causes the secondary voltage either to become zero periodically or to lower when connected with the ignition coil primary. Alternatively, the ignition timing is retarded from a normal timing in a portion of the combustion chambers to raise the exhaust gas temperature. An ignition system for the ignition timing retardation has a supplementary circuit which prevents certain times of the breaks in the primary circuit from producing sparks in the intended combustion chambers and supplies a high voltage pulse to each of these combustion chambers with a predetermined time delay from each of the breaks which are made ineffectual.