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:
Aug. 15, 1978
Filed:
Apr. 12, 1977
Nippondenso Co., Ltd., Kariya, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Abstract
An air-to-fuel ratio feedback control system which normally functions to correct the air-to-fuel ratio of a mixture supplied to an internal combustion engine to a predetermined air-to-fuel ratio in accordance with an output signal of an air-to-fuel ratio detector disposed in an exhaust passage. The system detects an inoperable period of the air-to-fuel ratio detector due to a low engine temperature and stops the feedback correction of the air-to-fuel ratio to prevent erroneous correction. Furthermore, during the full load operation and idling operation the system holds the feedback correction of the air-to-fuel ratio respectively at a little smaller and larger than the stoichiometric ratio irrespective of the output of the air-to-fuel ratio detector and enables to easily return to substantially the stoichiometric one when the engine operating condition returns to normal operation.