ТОПЛИВНАЯ СИСТЕМА


  1. CONSTRUCTION


    1. Solenoid valve type injector assemblies are used.

    2. Each injector assembly consists of a nozzle needle, a piston, and a solenoid valve.

    3. An injector compensation value (code) containing encoded characteristics of the injector is printed on each injector.

      A01KVMQC01
      *1 Injector Assembly *2 Solenoid Valve Spring
      *3 Solenoid Coil *4 Armature
      *5 Armature Spring *6 Solenoid Valve
      *7 Piston *8 Nozzle Needle Spring
      *9 Nozzle Needle *10 Check Ball
      *a Fuel (Return) *b Fuel (from Common-rail Assembly)
      *c Orifice *d View from Top Side
      *e Compensation Value - -

      Tech Tips


      • Differences in the injection volume occur when the injector assembly is manufactured. The injection volume is measured after manufacturing. Based on the measured value, a compensation value (code) is assigned to each injector assembly. The compensation value (code) for each cylinder is stored in the ECM. The ECM corrects the injection volume based on the code.

      • When replacing an injector assembly, check that the code stored in the ECM and the code of the injector assembly match for each cylinder. For details of injector assembly replacement, refer to the Repair Manual.

  2. OPERATION


    1. When electrical current is applied to the solenoid coil, it pulls the solenoid valve up.

    2. The orifice of the control chamber opens, allowing the fuel to flow out.

    3. The fuel pressure in the control chamber decreases.

    4. Simultaneously, fuel flows from the orifice to the bottom of the piston and raises the piston up (to enhance response).

    5. As a result, the piston raises the nozzle needle to inject fuel.

    6. When the electrical current applied to the solenoid coil is stopped, the solenoid valve is pushed down and the orifice of the control chamber is closed.

    7. The fuel pressure in the control chamber increases.

    8. As a result, the piston and the nozzle needle are pushed down and fuel injection stops.

      A01KVFUC02
      *1 Injector Assembly *2 Solenoid Coil
      *3 Solenoid Valve *4 Piston
      *5 Nozzle Needle *6 Check Ball
      *a Fuel (from Common-rail Assembly) *b Control Chamber
      *c Orifice *d Fuel (Return)