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:
Apr. 25, 2000
Filed:
Mar. 24, 1999
Susumu Takahashi, Kanagawa, JP;
Yasuhiro Nishiyama, Kanagawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
A fuel-injection system for an engine is disclosed for accomplishing a minute fuel injection by learning the minimum conductive duration to electronic devices for the beginning of the minute fuel injection. A controller unit may output at a time Tp a command pulse of an actuating current that is applied to solenoid-operated valves to make injectors to carry out the fuel injection. After a definite length of time T.sub.0 has elapsed, a common rail pressure begins decreasing from a mean value P.sub.0, which is kept until then. The controller unit changes incrementally the conductive duration Pwp of the command pulse for a pilot injection from the minimal conductive duration, and identifies the timing of the beginning of the fuel injection with the timing when an area Ar of pressure reduction is over a preselected value. In case the desired amount of fuel to be injected is too minute, the controller unit may calculate the conductive duration dependently on the minimum command pulse width.