LPI FUEL SYSTEM AND RETURN FUEL MINIMIZING METHOD
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United States of America Patent
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Issued Date -
Nov 28, 2013
app pub date -
Nov 5, 2012
filing date -
May 24, 2012
priority date (Note) -
Abandoned
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Abstract
A return fuel minimizing logic of a fuel pump may include:, after the fuel pump may be driven by detecting a key-on (IG ON) of engine, the pressure difference ΔP (=the bombe fuel pressure Pbombe−the fuel injection pressure Pinjector) may be detected, and then the target pressure ΔPtarget may be set to the engine starting pressure Pstart or at least four different engine running pressures Prunning so that the duty can be maintained, increased or decreased by controlling the fuel pump to optimize the flow rate discharged from the pump, considering the difference of the magnitude between the pressure difference ΔP and the target pressure ΔPtarget, by which the return flow rate which may be affected by the engine heat and the air temperature, can be reduced.
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