Dale L Taipale

US Patent:

57620407, Jun 9, 1998

Filed:

Feb 4, 1997

Appl. No.:

8/794381

Inventors:

Dale L. Taipale - Fond du Lac WI
Leonard S. Hummel - Eldorado WI

Assignee:

Brunswick Corporation - Lake Forest IL

International Classification:

F02B 300
F01P 106

US Classification:

123299

Abstract:

A loop-scavenged, two-cycle internal combustion engine has a low-pressure, cylinder wall fuel injection system that is practical for multi-cylinder marine engines and also reduces the amount of unburned hydrocarbons in exhaust emissions when compared to conventional carbureted two-cycle engines. The fuel injectors are mounted through the cylinder wall so that fuel spray contacts the piston crown underneath a zone in which incoming air flow through the transfer ports converges. The converging air flow helps to convect vaporized fuel from the piston crown upwards towards the spark plug electrode in the combustion chamber and away from the exhaust port, thereby reducing the likelihood of short circuiting unburned fuel through the exhaust port before the exhaust port closes and compression begins. All fuel is injected into the piston cavity before the exhaust port closes. In a multi-cylinder engine, all of the fuel injectors are mounted to have parallel spray axes and coplanar top ends, thus allowing the use of a straight fuel rail and convenient mounting techniques.

US Patent:

57913048, Aug 11, 1998

Filed:

Feb 13, 1997

Appl. No.:

8/800027

Inventors:

Dale L. Taipale - Fond du Lac WI

Assignee:

Brunswick Corporation - Lake Forest IL

International Classification:

F02D 908

US Classification:

123 73C

Abstract:

A cross-scavenged, two-cycle internal combustion engine has a low-pressure, cylinder wall fuel injection system that is practical for multi-cylinder marine engines. It also reduces the amount of unburned hydrocarbons in exhaust emissions when compared to a conventional carbureted two-cycle, cross-scavenged engine. The fuel injectors are mounted through the cylinder walls so that the fuel spray contacts a deflector on the piston crown. The fuel vaporizes upon contact, and scavenging air flow from the deflector towards the spark plug electrode convects the vaporized fuel towards the spark plug electrode, thereby reducing the likelihood of short circuiting of unburned fuel through the exhaust port before the exhaust port closes and compression begins. All fuel is injected into the piston cavity before the exhaust port closes. In a multi-cylinder engine, all of the fuel injectors are mounted to have parallel spray axes and coplanar top ends, thus allowing the use of a straight fuel rail and convenient mounting techniques.