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:
Mar. 02, 1999
Filed:
May. 01, 1997
Applicant:
Inventors:
Mamoru Fujieda, Ibaraki-ken, JP;
Toshiharu Nogi, Novi, MI (US);
Yoshishige Oyama, Hitachinaka, JP;
Minoru Ohsuga, Hitachinaka, JP;
Takuya Shiraishi, Hitachinaka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ; F02D / ; B60K / ;
U.S. Cl.
CPC ...
123399 ; 123478 ; 477100 ; 477109 ; 477111 ;
Abstract
An engine drive torque controller has a first mode in which torque is controlled by varying air-fuel ratio within a range greater than stoichiometric and a second mode in which torque is controlled while maintaining a substantially fixed air-fuel ratio. The control modes are selected to keep nitrogen oxide emissions low. The torque controller also changes the air-fuel ratio during transmission shifting to prevent variations in torque.