David A Enlow

US Patent:

48525367, Aug 1, 1989

Filed:

Dec 11, 1987

Appl. No.:

7/131858

Inventors:

Gerhard A. Maier - Mundelein IL
David L. Enlow - Wadsworth IL
Paul T. Ng - Park City IL

Assignee:

Outboard Marine Corporation - Waukegan IL

International Classification:

F02P 515
F02P 7067

US Classification:

123414

Abstract:

A trigger system for spark-fired internal combustion engines includes a plurality of magnets mounted in a structure that rotates in a timed relationship with the engine. One magnet is provided for each cylinder in the engine. All of the magnets except one have the same pole face exposed to couple inductively with a sensing coil, while the remaining magnet has an exposed pole of opposite polarity. The sensing coil is doubly wound and the resulting two coils are connected in opposite senses. The outputs of the two coils are taken to a decoding unit which produces an output of one pulse per magnet. Those pulses are substantially identical, regardless of magnet polarity, and are used to fire the spark plugs at the appropriate times. The decoding unit also produces a unique pulse which identifies the magnet of opposite polarity. That pulse is used to identify a selected cylider in the engine, such as the No.

US Patent:

46416188, Feb 10, 1987

Filed:

Nov 8, 1985

Appl. No.:

6/796088

Inventors:

Peter Dogadko - Chicago IL
David Enlow - Wadsworth IL

Assignee:

Outboard Marine Corporation - Waukegan IL

International Classification:

F02P 1100
F02D 3100
F02B 7708

US Classification:

123335

Abstract:

A circuit protecting against overspeed and overheating in a two-cycle engine having a capacitive discharge ignition system which includes a charging coil in which voltage is induced when a magnet in the flywheel of the engine passes the coil. A rectifier bridge is connected to the coil and a capacitor connected to the bridge. An ignition coil and spark plug are associated with each cylinder of the engine. An electronic switch is associated with each ignition coil and has a trigger which responds to an applied trigger voltage to conduct and discharge the capacitor through the ignition coil. A trigger coil applies a trigger voltage to the triggers. The protective circuit includes a control responsive to engine speed. The control triggers one of the electronic switches to conduct and discharge the capacitor in response to a predetermined response speed. A circuit responsive to operation of an engine temperature responsive switch reduces the predetermined response speed of the control to a lower response speed.