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:
Sep. 12, 2000
Filed:
Jun. 09, 1998
Yasuji Ishizuka, Kanagawa, JP;
Kimiyoshi Nishizawa, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
For proper treatment of NOx released from NOx absorbent catalyst as well as HC and CO in exhaust gas, a measure of A/F of exhaust gas downstream of the NOx absorbent is used as the input to a feedback control loop. The feedback control loop alters a feedback correction factor (or coefficient) of a fuel control command applied to each fuel injector in such a direction to decrease a deviation of the actual A/F input from a target A/F (stoichiometry or rich) When the measure of A/F has switched the side to rich, a measure of A/F of exhaust gas upstream of the NOx absorbent catalyst is used as the input to perform usual feedback control loop to maintain lean combustion mode.