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:
Jul. 31, 1979
Filed:
Oct. 25, 1977
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Aisan Industry Co., Ltd., Obu, JP;
Abstract
Disclosed is an exhaust gas cleaning apparatus of an internal combustion engine, provided with a three-way catalytic converter, an air-fuel ratio sensor and a secondary air injection system. The secondary air injection system has a diaphragm-operated flow control valve for increasing or decreasing the amount of secondary air introduced into the exhaust manifold of the engine in accordance with electrical signals transmitted from the air-fuel ratio sensor. Means are provided for rapidly increasing or decreasing the air-fuel ratio to a stoichiometric value at the moment when the amount of secondary air passed through the flow control valve is increased or decreased. Therefore, the air-fuel ratio is maintained quite near the stoichiometric value at which the three-way catalytic converter can effectively operate to clean the three major toxic components in the exhaust gas.