PRESSURE CONTROL APPARATUS OF FUEL TANK FOR VEHICLE

摘要

In pressure increasing control for raising a pressure within a sealed type fuel tank from an excessive negative pressure to a low negative pressure, an opening or closing operation of a sealing valve, when the interior of a vehicle is very quiet, may cause the working noise thereof to be transmitted to a passenger, thereby deteriorating the noise characteristic. When the pressure within a fuel tank is below a predetermined negative pressure near a saturated vapor pressure of the fuel and an interior noise level is equal to or greater than a threshold value, a controller may operate a sealing valve to thereby raise the pressure of the fuel tank to a normal negative pressure region which may be higher than the predetermined negative pressure.

主权项

1. A pressure control apparatus of a vehicle fuel tank, comprising:
an air introduction passage having a first end connected to the fuel tank and a second end opened to outside air; a sealing valve configured to open and close the air introduction passage; and a controller configured to control an opening and closing operation of the sealing valve, wherein the controller operates the sealing valve to raise pressure of the fuel tank to a pressure in a normal negative pressure region which is higher than a predetermined negative pressure when the pressure of the fuel tank is below the predetermined negative pressure and an interior noise level is equal to or greater than a threshold value.