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. 09, 1997
Filed:
Feb. 23, 1996
Applicant:
Inventor:
Naoki Tomisawa, Atsugi, JP;
Assignee:
Unisia Jecs Corporation, Kanagawa-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ;
U.S. Cl.
CPC ...
123421 ; 123424 ; 123425 ; 123435 ;
Abstract
Within a predetermined time immediately after start up, ignition timing is retarded within a range wherein the output fluctuations do not exceed a predetermined permissible limit. Subsequently under conditions after elapse of the predetermined time but when warm up has not yet been completed, air-fuel ratio is weakened within a range wherein the output fluctuations do not exceed a predetermined permissible limit. Then after warm up an exhaust gas recirculation amount is increased within a range wherein the output fluctuations do not exceed a predetermined permissible limit.