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. 03, 2015
Filed:
Jan. 07, 2014
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
When an internal combustion engine () is determined to be in a low-temperature start state (an affirmative determination is made in S), an air-fuel ratio control apparatus () controls the temperature of a downstream detection element () of a downstream gas sensor () to a downstream target temperature by driving a downstream heater () of the downstream gas sensor () (S), and feedback-controls the air-fuel ratio of exhaust gas based on the output of the downstream gas sensor () (S). When the engine () is determined not to be in the low-temperature start state (a negative determination is made in S), the air-fuel ratio control apparatus () drives an upstream heater () of an upstream gas sensor () and feedback-controls the air-fuel ratio of exhaust gas based on the output of the upstream gas sensor () (S).