Internal-combustion engines – Charge forming device – Auxiliary control of carburetor fuel metering
Patent
1997-12-11
2000-06-20
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Auxiliary control of carburetor fuel metering
123441, F02D 4126
Patent
active
060765038
ABSTRACT:
The present invention involves a carbureted fuel system for an internal combustion engine for small utility implements. The engine includes a crankcase with a cylinder bore. The crankcase rotatably supports a crankshaft having a flywheel and a magnet disposed on an outer periphery of the flywheel. The crankshaft is also connected to a reciprocating piston disposed in the cylinder bore. A cylinder head is attached to the crankcase over the cylinder bore, and a carburetor is disposed on the cylinder head. The carburetor is in communication with a fuel supply and an air inlet. The carburetor includes a mixing chamber in which the fuel and air are mixed together and then introduced into the manifold and eventually into the cylinder via a valve for combustion therein. In communication with the main passage of the carburetor is a secondary air inlet in which is disposed an air bleed device, such as a solenoid or PZT operated actuator, which is controlled by an electronic control unit. An induction coil is disposed adjacent the flywheel and is coupled to the electronic control unit so that the rotation of the flywheel generates a pulse on the induction coil that is processed by the electronic control unit. Based upon the information derived from the electrical pulses generated by the induction coil, the electronic control unit activates the air bleed device to enrich or enlean the air-to-fuel mixture fed into the cylinder for combustion. In this manner emissions associated with the operation of the engine may be reduced.
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Argenbright Tony M.
Castro Arnold
Tecumseh Products Company
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