Einspritzvorrichtung mit magnetischem Schwungrad

• Main Authors: CARPENTER, TODD L., GREGORY, MICHIGAN 48137, US, WARD, DENNIS P., ANN ARBOR, MICHIGAN 48103, US
• Format: Patent
• Language: German
• Published: 08.07.1999
• Edition: 6
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

The present invention involves a fuel injection system for an internal combustion engine for small utility implements. The engine includes a crankcase (20) with a cylinder bore (22). The crankcase rotatably supports a crankshaft (24) having a flywheel (30) and a magnet (34) disposed on an outer periphery of the flywheel. The crankshaft is also connected to a reciprocating piston (26) disposed in the cylinder bore. A cylinder head (46) is attached to the crankcase over the cylinder bore, and a fuel injector (44) is disposed in the cylinder head. The fuel injector is in communication with a fuel supply (40) and can inject quantities of fuel into the cylinder head. An induction coil (38) is disposed adjacent to the flywheel, and is coupled to the fuel injector so that rotation of the flywheel generates a pulse on the induction coil that actuates the fuel injector. A fuel pump (42) is driven by the crankshaft and supplies pressurized fuel to the injector. A timing control circuit (58) is connected to the fuel injector and the induction coil to regulate the operation of the fuel injector. The timing control circuit interrupts the induction coil with a pulse width modulated signal when the duration of the actuating pulse exceeds a calculated duration to close the fuel injector. A pressure sensor (60) is disposed in the cylinder head and provides an input to the timing control circuit.