FUEL SYSTEM GENERAL


  1. OUTLINE


    1. The 2GR-FSE engine uses a Direct injection 4-stroke gasoline engine Superior version (D-4S) system, which has both direct and port type fuel injection.

    2. This system optimally controls the fuel injectors for direct injection and port injection in accordance with engine load. The system achieves improved engine performance, fuel economy, and clean emissions.

      A01FCEWE01
      Text in Illustration
      *1 Fuel Injector Assembly (for Port Injection) *2 Fuel Injector Assembly (for Direct Injection)

    3. A fuel returnless system is used to reduce evaporative emissions.

    4. A fuel cut control is used to stop the fuel pump assembly (for low pressure) if the SRS airbag is deployed.

    5. Fuel injector assembly (for direct injection) with double slit nozzle is used.

    6. On the models for Korea, an On-board Refueling Vapor Recovery (ORVR) system is used. For details, see the 2GR-FSE Emission Control.

  2. MAIN FEATURES


    1. D-4S System


      1. The Direct injection 4-stroke gasoline engine Superior version (D-4S) system is based on 2 types of fuel injection systems: the direct injection system and the port injection system. Fuel sent from 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 (for high pressure) and injected from the fuel injector assembly (for direct injection) to the combustion chamber.

      2. The direct injection system mainly consists of the fuel pump assembly (for high pressure), fuel delivery pipe sub-assembly (for direct injection) and fuel injector assembly (for direct injection). In this system, the ECM controls the fuel pump assembly (for high pressure) and fuel injector assembly (for direct injection) via the Electronic Driver Unit (EDU) 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 assembly (for low pressure), fuel delivery pipe sub-assembly (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.

        A01FBMEE01
        Text in Illustration
        *1 EDU *2 ECM
        *3 Fuel Delivery Pipe Sub-assembly (for Port Injection) *4 Fuel Injector Assembly (for Port Injection)
        *5 Fuel Injector Assembly (for Direct Injection) *6 Fuel Delivery Pipe Sub-assembly (for Direct Injection)
        *7 Fuel Pressure Pulsation Damper Assembly *8 Fuel Relief Valve Assembly
        *9 Fuel Pressure Sensor *10 Fuel Tank Assembly
        *11 Fuel Main Valve *12 Fuel Pump Assembly (for Low Pressure)
        *13 Fuel Pressure Regulator Assembly *14 Exhaust Camshaft (Cam to Drive Fuel Pump)
        *15 Spill Control Valve - -
        A01FC4S Low-pressure Fuel A01FBVW High-pressure Fuel

    2. Fuel Returnless System (for Low-pressure Side)


      1. A fuel returnless system is used to reduce evaporative emissions. As shown below, by integrating the fuel filter assembly, fuel pressure regulator assembly and fuel pump, it is possible to discontinue the return of fuel from the engine area, thus preventing temperature rise inside the fuel tank assembly. This reduces the generation of evaporative emissions in the fuel tank assembly.

        A01FBMHE01
        Text in Illustration
        *1 Fuel Injector Assembly (for Port Injection) *2 Fuel Delivery Pipe Sub-assembly (for Port Injection)
        *3 Fuel Pressure Pulsation Damper Assembly *4 Fuel Tank Assembly
        *5 Fuel Filter Assembly *6 Fuel Pressure Regulator Assembly
        *7 Fuel Pump Assembly (for Low Pressure) - -
        *a To High-pressure Fuel System - -