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:
Mar. 30, 1999
Filed:
Sep. 11, 1997
David H Smith, Mercer Island, WA (US);
IMPCO Technoligies, Inc., Cerritos, CA (US);
Abstract
A dual fuel injector for an engine is selectively controlled to either inject a liquid fuel such as gasoline or a gaseous fuel such as butane or propane to the engine. The injection of one fuel or the other is effected by alternatively feeding a pulsating voltage of one polarity or he other to the coil of an electrically controlled injector. The injector has a permanent magnet armature which is driven in one direction in response to pulses fed to its surrounding coil of one polarity and the opposite direction in response to pulses fed to the coil of the other polarity. When the armature is driven in a first direction, it drives a pintle attached thereto in that direction. The pintle in turn drives against a spring urged valve to open this valve, thereby permitting gasoline to pass through the control injector from where it is injected into the engine in a pulsating manner. When the armature is driven in an opposite direction, it drives a pintle in this same opposite direction against a second spring urged valve to open this valve to permit pulsating gaseous fuel to pass through the injector to the engine.