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. 20, 2005
Filed:
Jul. 01, 2004
Applicant:
Shigeo Ohkuma, Atsugi, JP;
Inventor:
Shigeo Ohkuma, Atsugi, JP;
Assignee:
Hitachi, Ltd., Tokyo-to, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D041/06 ; F02D041/14 ;
U.S. Cl.
CPC ...
Abstract
When an internal combustion engine is in a low load and low rotation operation, and also an elapsed time after the starting of engine operation is less than a predetermined period of time, a heater heating an air-fuel ratio sensor is turned OFF, to stop an air-fuel ratio feedback control. When the internal combustion engine is in the low load and low rotation operation after the predetermined period of time has elapsed, a low voltage is applied to the heater and also a gain is lowered, to perform the air-fuel ratio feedback control.