| 摘要 |
PROBLEM TO BE SOLVED: To suppress air bubbles in fuel caused by the atmospheric pressure, in a fuel supply device capable of reducing the pressure of fuel inside a fuel supply pipe for supplying fuel to a cylinder fuel injection valve by using the atmospheric pressure. SOLUTION: An automobile 20 is equipped with a high pressure pump 64 for further pressurizing fuel inside a fuel pipe 63 and supplying the fuel to a delivery pipe 66 to which the cylinder fuel injection valve 25 is connected, and with an electromagnetic-type relief valve 67 capable of reducing the pressure of pressurized fuel inside the delivery pipe 66 by using the atmospheric pressure. During stop of an engine 22, when the atmospheric pressure detected by an atmospheric pressure sensor 89 exceeds a threshold value, the relief valve 67 is opened only for opening time corresponding to the atmospheric pressure and fuel pressure, so as to reduce the fuel pressure. When the atmospheric pressure is below the threshold value, opening of the relief valve 67 is not performed. In this case, by using the atmospheric pressure correlated with presence/absence of air bubbles inside the delivery pipe 66, reduction of the fuel pressure inside the delivery pipe 66 is restricted. COPYRIGHT: (C)2007,JPO&INPIT
|
