Fuel tank control valve for vehicle

Abstract

Provided is a fuel tank control valve for a vehicle that appropriately and actively controls a loading pipe of an evaporation gas which is connected from a fuel tank to a canister, and prevents internal pressure of the fuel tank from excessively increasing or decreasing, by basically preventing the evaporation gas from being loaded from the fuel tank to the canister when the engine is turned off, allowing the evaporation gas to be loaded from the fuel tank to the canister when the engine is turned on, and allowing the evaporation gas to be loaded from the fuel tank to the canister, even if the engine is turned off, when the vehicle is filled with fuel.

1 . A fuel tank control valve for a vehicle, comprising:
 a housing having a first port connected to a fuel tank and a second port connected to a canister;   a pressure valve spool disposed to slide linearly in the housing, connects or disconnects the first port and the second port, and has a through-hole;   a solenoid actuator having a plunger that moves linearly to close the through-hole and press the pressure valve spool in a disconnection direction of the first port and the second port;   a pressure spring elastically supporting the pressure valve spool in a connection direction of the first port and the second port; and   a balance spring pressing the plunger, opposite to the pressure spring.   
     
     
         2 . The fuel tank control valve for a vehicle as defined in  claim 1 , wherein the housing has a bypass channel that bypasses the pressure valve spool disconnecting the first port and the second port and connects the first port with the second port, and
 the bypass channel is further provided with a relief valve that opens the bypass channel when the pressure of the fuel tank becomes a first reference pressure or more and a vacuum valve that opens the bypass channel when the pressure of the fuel tank becomes a second reference pressure or less.   
     
     
         3 . The fuel tank control valve for a vehicle as defined in  claim 2 , wherein the through-hole of the pressure valve spool connects the first port with the second port through the pressure valve spool when the plunger is spaced apart. 
     
     
         4 . The fuel tank control valve for a vehicle as defined in  claim 3 , wherein the pressure valve spool includes a spool body having a flat plate shape with the through-hole and a plurality of guide protrusions protruding from the spool body, perpendicular to the flat plate shape of the spool body, to guide the spool body to slide linearly within the housing. 
     
     
         5 . The fuel tank control valve for a vehicle as defined in  claim 3 , wherein the balancing spring elastically biases the plunger toward the pressure valve spool in the solenoid actuator. 
     
     
         6 . The fuel tank control valve for a vehicle as defined in  claim 3 , wherein the relief valve and the vacuum valve are arranged sequentially in the bypass channel. 
     
     
         7 . The fuel tank control valve for a vehicle as defined in  claim 6 , wherein a relief body is inserted in a space where the bypass channel is formed in the housing,
 a relief valve spool of the relief valve is inserted to slide linearly in the relief body, and   a relief spring elastically supporting the relief valve spool is disposed against pressure applied from the first port.   
     
     
         8 . The fuel tank control valve for a vehicle as defined in  claim 7 , wherein the vacuum valve is disposed at the relief body to open the bypass channel by means of self-deformation due to pressure applied from the second port. 
     
     
         9 . The fuel tank control valve for a vehicle as defined in  claim 8 , wherein the vacuum valve has an insertion protrusion that is inserted through the relief body, at the center, and an elastic plate integrally connected with the insertion protrusion in an umbrella shape and closing a connection hole formed in the relief body by using elastic force.