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. 18, 2007
Filed:
Oct. 30, 2003
Shigeru Yamazaki, Odawara, JP;
Hirokazu Hirosawa, Odawara, JP;
Shigeru Yamazaki, Odawara, JP;
Hirokazu Hirosawa, Odawara, JP;
Mikuni Corporation, Tokyo, JP;
Abstract
A fuel injection method is provided for correcting the fuel injection amount accurately by eliminating offset components when detecting a current flowing through a solenoid for fuel injection. A current component, which is detected during normal running and a drive current flowing through the solenoid for fuel injection is OFF (Step), is input to an A/D converter that stores the value thereof (Step). Thereafter, the drive current is turned ON (Step S), elapse of a fixed time period is waited (Step S), and an input voltage of the A/D converter is detected (Step S). A difference current (offset component) is calculated by subtracting the offset voltage from the input voltage (Step S), and a current span is adjusted based on a span correction factor (Step S). Thereafter, a pulse width current correction factor is calculated (Step S) and, based on the pulse width current correction factor, a drive pulse width is calculated (Step S) and provided to the solenoid.
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