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. 07, 1999
Filed:
Nov. 03, 1997
Kouji Hosokawa, Higashimurayama, JP;
Kousaku Shimada, Hitachinaka, JP;
Hitachi, Ltd., , JP;
Abstract
An engine control apparatus in which it is possible to suppress variation of the A/F ratio due to variation of the fuel pressure and for the A/F ratio to converge in a very short time when continuous variation of the increase and decrease of the fuel pressure based on an operation state is performed in the A/F ratio control of an engine. The engine control apparatus sets a target fuel pressure based on an operation state, detects fuel pressure and controls fuel pressure to the target fuel pressure. An integration component of the feedback coefficient of the A/F ratio is corrected when at least one of the target fuel pressure and the detected fuel pressure is varied. Fuel injection amount is calculated based on the detected amount of intake air, the target A/F ratio and the feedback coefficient of the A/F ratio.