FUEL AND WATER INJECTION SYSTEM AND METHOD FOR CONTROLLING THE SAME

A fuel and water injection system includes: an injector having a needle which is movable upwardly and downwardly by a solenoid coil, a nozzle orifice which is opened and closed by upward and downward movements of the needle, and a pressure chamber communicating with the nozzle orifice; a fuel pump supplying fuel to the pressure chamber; a water pump supplying water to the pressure chamber; a solenoid shut-off valve disposed on a water supply pipe connecting the water pump and the injector; an engine control unit (ECU) controlling the fuel pump and the injector; and a water supply controller controlling the water pump and the solenoid shut-off valve.