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:
Feb. 17, 1976
Filed:
Apr. 10, 1974
Richard VAN Basshuysen, Bad Wimpfen, DT;
Audi NSU Auto Union Aktiengesellschaft, Neckarsulm, DT;
Abstract
An exhaust gas detoxication system for a motor vehicle combustion engine with external ignition includes an air pump driven by the engine to deliver secondary air into the exhaust system. The exhaust system contains a thermal reactor wherein final combustion of as yet unburned constituents of the exhaust gas takes place. Since as the speed of the engine increases, more air is delivered than required for final combustion, a blow-off valve is arranged in the delivery line of the air pump, limiting the flow of air supplied to the exhaust system and in general shutting it off completely at a certain engine speed. Exhaust gas detoxication systems to which the invention relates are provided with a means for shifting to retarded ignition during the warm-up phase of the reactor, whereby elevated temperatures of the exhaust gases and hence a faster response of the reactor are obtained. This retardation of the ignition, however, is injurious at high rotational speeds; and therefore, a speed controlled device overriding this shifting means is provided. This device, at an engine speed above a certain value, actuates a switch that shifts the ignition time to advanced ignition.