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. 09, 1978
Filed:
Jun. 04, 1976
Nobuaki Wakita, Susono, JA;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JA;
Abstract
An exhaust gas purifying apparatus for use in connection with an internal combustion engine, especially for an automobile. The apparatus includes a fluid flow changeover valve having an outlet connected to the intake system of the engine, an exhaust gas inlet connected to the exhaust system and an air inlet connected to a source of pressurized air, for example, an air pump driven by the engine. When rotation of the engine is slow and consequently the output pressure of the air source is low, supply of the air to the intake system is stopped but exhaust gas is supplied thereto, whereby generation of nitrogen oxides (NOx) is reduced. In response to increase in the engine speed, air and exhaust gas are both supplied to the intake system until the output pressure of the air source increases to a predetermined value, whereby uniform combustion of fuel-air mixture in cylinders is maintained. When the output pressure of the air source exceeds the predetermined value, supply of exhuast gas to the intake system is stopped but only air is supplied thereto, causing dilution of fuel-air mixture provided through the carburetor, whereby fuel consumption is decreased and overheating of the exhaust gas purifying apparatus is prevented.