DIAPHRAGM CARBURETOR WITH FUEL METERING COMPENSATION
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 4, 2014
filing date -
Mar 14, 2013
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Abstract
A fuel and air supply device for an engine includes a carburetor having a fuel metering assembly with a fuel metering diaphragm defining at least part of a reference chamber, a scavenging air assembly including an air passage and an air valve moveable within the passage to alter air flow through the air passage, and a reference passage. The reference passage communicates at one end with the air passage upstream of the air valve and at its other end with the reference chamber to provide a reference air signal through the reference passage to the reference chamber. The reference air signal, in at least some implementations, is taken from a location downstream of an air filter and any other components so it is representative of the air flow at the air valve and accounts for restrictions to air flow caused upstream of the air valve.
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