Method and device for increasing purge rate of fuel evaporation gas of vehicle

A fuel evaporation gas purge system for a vehicle, the fuel evaporation gas purge system comprising:

• a purge pump;
• a pressure sensor configured to detect a pressure at a front end of the purge pump and a pressure at a rear end of the purge pump;
• a rotation sensor configured to detect a number of rotations of the purge pump;
• an opening amount sensor configured to detect an opening amount of a purge control solenoid valve that supplies fuel evaporation gas pumped by the purge pump to an intake manifold of an engine of the vehicle;
• and
• a controller configured to:
• determine a first fuel evaporation gas density in the purge pump based on at least one of:
• a difference between the pressure at the front end of the purge pump and the pressure at the rear end of the purge pump,
• a radius of a fluid passage of the purge pump,
• the number of rotations of the purge pump, or
• the opening amount of the purge control solenoid valve;
• filter the first fuel evaporation gas density using a filter for controlling an amount of change in the first fuel evaporation gas density based on the amount of change in the first fuel evaporation gas density being greater than or equal to a reference change amount;
• determine a second fuel evaporation gas density in the purge pump based on the filtered first fuel evaporation gas density;
• determine a third fuel evaporation gas density in a standard temperature and pressure state based on the second fuel evaporation gas density, a current pressure in the purge pump, and a current temperature in the purge pump;
• determine a concentration of hydrocarbon in the fuel evaporation gas in the purge pump based on the third fuel evaporation gas density;
• and
• increase a purge rate of the fuel evaporation gas based on the determined concentration of hydrocarbon in the fuel evaporation gas.