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, would cause the working noise thereof to be transmitted to a passenger, thereby deteriorating the noise characteristic. In order to solve this problem, a control unit 32, when the pressure within a fuel tank 14 is below a predetermined negative pressure P VL near a saturated vapor pressure of the fuel and an interior noise level is equal to or greater than a threshold value, operates a sealing valve 28 to thereby raise the pressure of the fuel tank 14 to a normal negative pressure region P L to P U which is higher than the predetermined negative pressure P VL .
PRESSURE CONTROL APPARATUS OF FUEL TANK FOR VEHICLE
DRUCKSTEUERUNGSVORRICHTUNG FÜR DEN KRAFTSTOFFTANK EINES FAHRZEUGS
APPAREIL DE RÉGULATION DE PRESSION DE RÉSERVOIR À CARBURANT POUR VÉHICULE
2019-05-01
Patent
Electronic Resource
English
IPC: | B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES |