| 摘要 |
PURPOSE:To avoid being made into overrichness in time of acceleration, by lowering fuel pressure in a fuel passage at the discharge side of a fuel pump at a time when fuel temperature is below the setting value, while keeping off any fuel injection from an air vent. CONSTITUTION:At usual time, a first temperature sensor 18 and a second temperature sensor 19 both are in the same temperature. At acceleration driving where a fuel supply increases and a flow velocity of fuel comes fast from a state that fuel temperature comes high and minute air bubbles are produced in fuel being fed, fuel is made into foaminess whereby the foamed fuel is spouted out of an air vent 10. This fuel wets a surface of the second temperature sensor 19, and with evaporation in the fuel, the second temperature sensor 19 is cooled. Since temperature differences (theta1>theta2) are produced between these first and second temperature sensors 18 and 19, a control circuit 15 opens a pressure reducing valve 14, lowering fuel pressure at the downstream of a fuel passage 4 down to some extent, and it reduces a pressure differential between both upstream and downstream sides of a needle valve 6, thus such a phenomenon as making the fuel into foaminess is checked. |
