FUEL SYSTEM


  1. OUTLINE


    1. The 8AR-FTS engine uses a Direct injection 4-stroke gasoline engine Superior version (D-4S) system, which has both direct and port type fuel injection. Fuel sent from the fuel pump (low pressure) in the fuel tank assembly is delivered to the low-pressure and high-pressure fuel systems. The fuel delivered to the low-pressure fuel system is injected from the fuel injector assembly (for port injection) to the intake port. The fuel delivered to the high-pressure fuel system is pressurized by the fuel pump assembly (high pressure) and injected from the fuel injector assembly (for direct injection) to the combustion chamber. The system achieves improved engine performance, fuel economy and clean emissions.

    2. The direct injection system mainly consists of the fuel pump assembly (high pressure), fuel delivery pipe (for direct injection) and fuel injector assembly (for direct injection). In this system, the ECM controls the fuel pump assembly (high pressure) and fuel injector assembly (for direct injection) based on signals from various sensors, thus optimally controlling fuel pressure, injection volume and injection timing.

    3. The port injection system mainly consists of the fuel pump (low pressure), fuel delivery pipe (for port injection) and fuel injector assembly (for port injection). In this system, the ECM controls the fuel injector assembly (for port injection) based on signals from various sensors, thus optimally controlling injection volume and timing.

    4. The low-pressure fuel system uses the fuel pressure sensor (for low pressure) and a pressure discharge valve assembly installed in the fuel suction tube assembly to perform variable fuel pressure control. Low fuel consumption is achieved by reducing the power consumption of the fuel pump (low pressure), which optimally controls the fuel pressure according to the driving conditions.

    5. Fuel pressure control for the high-pressure fuel system is performed via the spill control valve installed in the fuel pump assembly (high pressure).

    6. A fuel cut control is used to stop the fuel pump (for low pressure) when any of the Supplemental Restraint System (SRS) airbags are deployed.