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. 12, 1989
Filed:
Apr. 11, 1988
Robert J Hensel, Oshkosh, WI (US);
Brunswick Corporation, Skokie, IL (US);
Abstract
A two cycle crankcase compression fuel injected internal combustion engine has a first set of one or more throttle valves (104, 106) controlling combustion air flowing into the crankcase, and a second set of one or more throttle valves (110, 112) also controlling combustion air flowing into the crankcase. A throttle position sensor (104, 106) and controls fuel injection according to throttle position. Increased resolution of sensed throttle position at low engine speed is provided by admitting combustion air only through the first set of throttle valves (104, 106) and not through the second set of throttle valves (110, 112) at low engine speed for an initial given range of motion, such that greater movement of the first set of throttle valves (104, 106) is required to obtain a given amount of combustion air flow for a given engine speed, prior to opening the second set of throttle valves (110, 112), to provide more accurate fuel injection and better driveability. Progressive throttle linkage (200) is moveable to open the first set of throttle valves (104, 106) through a given range of motion prior to opening the second set of throttle valves (110, 112).