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:
May. 29, 1979
Filed:
Oct. 25, 1977
Toshikazu Koide, Susono, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
Disclosed is an apparatus for controlling secondary air for purifying exhaust gas discharged from an internal combustion engine. The apparatus comprises a pair of catalytic converters disposed in series within an exhaust system, a secondary air switching device communicated with two positions each of which is located respectively upstream of each of the catalytic converters, an actuating device for selectively communicating the secondary air switching device with each of the above-mentioned two positions, and a detecting device for detecting the temperature of the first catalytic converter located upstream of the second converter. If the detecting device detects a condition wherein the temperature of the first catalytic converter is lower than a predetermined level, secondary air is supplied to the position upstream of the first catalytic converter. On the other hand, if the detecting device has detected a condition wherein the temperature of the first catalytic converter is above the predetermined level, secondary air is alternately supplied to each of the above-mentioned two positions. By utilizing the apparatus of the present invention, the converting efficiency of the first catalytic converter can be maintained at a high level.