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. 01, 2006
Filed:
May. 11, 2005
Shigeyuki Sakaguchi, Yokohama, JP;
Yoichiro Nakahara, Inagi, JP;
Shigeyuki Sakaguchi, Yokohama, JP;
Yoichiro Nakahara, Inagi, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An engine control device is configured to prevent a rotational speed of a vehicle engine from becoming abnormally low during deceleration due to an abnormal air-fuel ratio. When conditions for feedback control of engine idle speed are not satisfied and self diagnosis results of the air-fuel ratio control system are normal, the control device determines if the air-fuel ratio is in an abnormally lean state. The control device then determines if the abnormally lean air-fuel ratio state has continued without interruption for a prescribed period or longer. If so, the control device calculates an air-fuel ratio abnormality compensation quantity, e.g., adds an air-fuel ratio abnormality compensation value to an idle compensation air quantity, to increase the intake air quantity and compensate for the engine torque deficiency resulting from the lean air-fuel ratio state.