Electronically controlled carburetor

F - Mech Eng,Light,Heat,Weapons – 02 – M

Patent

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Details

F02M 7/10 (2006.01) F02D 35/00 (2006.01) F02D 37/02 (2006.01) F02D 41/30 (2006.01) F02P 1/02 (2006.01) F02P 1/08 (2006.01)

Patent

CA 2224755

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 crank shaft 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.

Cette invention concerne un circuit d'alimentation à carburateur pour moteur à combustion interne de petite machine utilitaire. Le moteur se compose d'un carter, d'un bloc-cylindre, d'un vilebrequin à volant d'inertie portant un aimant sur sa périphérie, d'un piston alternatif couplé au vilebrequin et logé dans le cylindre du bloc-cylindre, d'une culasse sur laquelle est monté un carburateur et de soupapes d'admission et d'échappement. Le carburateur comporte une enceinte où se fait le mélange du carburant et de l'air d'alimentation et qui est raccordée à la tubulure d'alimentation du cylindre. L'enceinte principale du carburateur est en communication avec une admission d'air secondaire à prise d'air à solénoïde ou à élément piézoélectrique commandé par un régulateur électronique. € proximité du volant d'inertie se trouve une bobine d'induction couplée au régulateur électronique pour transmettre à celui-ci une impulsion électrique à chaque passage de l'aimant du volant d'inertie. Le régulateur électronique actionne la prise d'air en fonction des caractéristiques des impulsions électriques engendrées par la bobine d'induction pour soit enrichir soit appauvrir le mélange air-carburant destiné à être brûlé dans le cylindre du moteur. Cette disposition constructive permet de réduire les émissions polluantes du moteur.

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