To provide a fuel supply device capable of improving fuel economy by preventing an actual fuel injection amount from diverging from a desired fuel injection amount even when a fuel pressure is switched.
An ECU estimates a return flow rate Q on the basis of a leanest voltage Vaf in which an air-fuel ratio is the lowest and an initial voltage Vini (step S21), and calculates a coefficient Coexp (step S22). The ECU then calculates an overshoot amount OS by the multiplication of the coefficient Coexp calculated in the step S22 and a reference overshoot amount OSbase (step S23), and calculates a duration Tos of the overshoot by the multiplication of the coefficient Coexp calculated in the step S22 and a reference duration Tosbase of the overshoot (step S24).
AKAGI MASANORI
KAMIYA KATSUNORI
YOSHIDA YASUSHI
AISAN IND
Eigarou Ariga