Patent ID: 6715738
Filing Date: 2004-04-06
Classification: F02M,Y10S

Abstract:
An apparatus for controlling a fuel-air mixture provided to an internal combustion engine, the apparatus comprising:a body; a mixing passage formed in the body and configured to provide a fuel-air mixture to one or more combustion chambers of an internal combustion engine; a main fuel supply passage providing fluid communication between a fuel source and the mixing passage through a main fuel nozzle; an idle fuel supply passage providing fluid communication between a fuel source and the mixing passage through an idle fuel nozzle; an idle fuel ratio control valve carried by the body and configured to adjust the proportion of fuel provided into the mixing passage through the idle fuel supply passage to the flow rate of air through the mixing passage; the idle fuel supply passage being in fluid communication with the main fuel nozzle and configured such that vacuum pressure induced by flow rates across the main fuel nozzle, which exceed a predetermined flow rate, precludes idle fuel flow into the mixing passage; and a main fuel flow ratio control valve carried by the body and configured to adjust the proportion of fuel provided into the mixing passage through the main fuel supply passage to the flow rate of air through the mixing passage.