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:
May. 29, 2001
Filed:
Feb. 16, 1999
Isuzu Motors Limited, Tokyo, JP;
Abstract
A fuel-injection system for an engine is disclosed in which a standard conductive duration of the individual injectors required for a desired volume of fuel injected per cycle may be easily provided by correcting a standard conductive duration to a solenoid-operated valve, which has been found depending on a standard fuel-injection characteristic. A controller unit is stored with a standard fuel-injection characteristic A that is used for obtaining a standard actuating pulse width Pws for the standard conductive duration corresponding to a desired volume Qf of the injected fuel, which is required depending on the operating conditions of the engine. A specified operating point (Q,, Pw,) is a known data that has been previously observed for the individual injectors. The actuating pulse width Pw necessary for determining the desired volume Qf of injected fuel is given by multiplying the standard actuating pulse width Pw,by a correction coefficient that is a ratio of the standard actuating pulse width Pws,to the specified actuating pulse width Pw,. The correction coefficient is computed at plural selected pressure ranges of a hydraulically actuated fluid while the process of interpolation provides the correction coefficient at the residual pressure ranges. This makes it possible to eliminate the stoop change of the correction coefficient K with the result of the protection of the engine from torque-shock.