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:
Dec. 08, 1981
Filed:
Mar. 25, 1980
Yukihiro Etoh, Yokohama, JP;
Toshiaki Tanaka, Fujisawa, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
An internal combustion engine is disclosed which includes active cylinders being always active and inactive cylinders being inactive when the engine is below a predetermined value. The engine has an exhaust passage divided by a partition into first and second branches leading from the active and inactive cylinders. The second branch is connected through an EGR passage with the inactive cylinders at low load conditions. An exhaust gas sensor is provided in a through-hole formed in the partition at a position downstream of the opening of the EGR passage for monitoring one content of the engine exhaust to provide a signal indicative of the air/fuel ratio. The second branch has a volume, upstream of the opening of the EGR passage, larger than the stroke volume of the inactive cylinders.