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. 15, 1977
Filed:
Dec. 30, 1975
Johannes Brettschneider, Ludwigsburg-Pflugfelden, DT;
Lorenz Bundesen, Flensburg, DT;
Heinrich Knapp, Leonberg-Silberberg, DT;
Robert Bosch G.m.b.H., Stuttgart, DT;
Abstract
An apparatus for the detoxification of exhaust gases of an internal combustion engine having a fuel metering mechanism, such as a carburetor, which meters out fuel corresponding to the air quantity, is described. An air quantity measuring device is provided which controls the metering mechanism so as to achieve a slightly enriched fuel-air mixture. Thus, the air number (.lambda.) is initially maintained at less than 1, the air number 1 designating a stoichiometric fuel-air mixture. Secondary air is admitted via a secondary air pump, an oxygen sensor being disposed on the exhaust side, until such time an optimum of fuel-air mixture is reached. The secondary air is admitted into the suction tube of the internal combustion engine downstream of the air measuring device.