3232878 - 1060F injectors and lines

COMPONENT DESCRIPTION

INJECTORS

Specifcations

StructureThe injectors are fitted on the cylinder head and operated by the engine management control unit.

The injectors can be divided into two sections:

  • actuator/nozzle consisting of a pressure rod (1), pin (2) and jet (3)
  • solenoid valve consisting of a coil (4) and pilot valve (5).

Operation

Introduction

The operation of the injector can be divided into three stages:

  • rest position. The coil (4) is de-energized and the shutter (6) is in the closed position and does not allow the introduction of fuel into cylinder Fc > Fa (Fc: due to the line pressure acting on control area 7 of the rod 1; Fa: due to the line pressure acting in supply volume (8).
  • start of injection. The coil (4) is energized and causes the shutter (6) to be raised. The control volume (9) fuel flows towards the return manifold (10) causing a decrease in pressure in the control area (7). At the same time, the line pressure exerts a force Fa > Fc in the supply volume (8), via the supply duct (12), causing the raising of the pin (2) with the consequent introduction of fuel into the cylinders.
  • end of injection. The coil (4) is de-energized and returns the shutter (6) to the closed position which recreates an equilibrium with forces which return the pin (2) to the closed position and consequently end the injection.

Operation

Introduction

The operation of the injector can be divided into three stages:

  • rest position. The coil (4) is de-energized and the shutter (6) is in the closed position and does not allow the introduction of fuel into cylinder Fc > Fa (Fc: due to the line pressure acting on control area 7 of the rod 1; Fa: due to the line pressure acting in supply volume (8).
  • start of injection. The coil (4) is energized and causes the shutter (6) to be raised. The control volume (9) fuel flows towards the return manifold (10) causing a decrease in pressure in the control area (7). At the same time, the line pressure exerts a force Fa > Fc in the supply volume (8), via the supply duct (12), causing the raising of the pin (2) with the consequent introduction of fuel into the cylinders.
  • end of injection. The coil (4) is de-energized and returns the shutter (6) to the closed position which recreates an equilibrium with forces which return the pin (2) to the closed position and consequently end the injection.
1. Pressure rod 2. Pin 3. Nozzle 4 Coil 5. Pilot valve 6. Spherical shutter 7. Control area 8. Supply volume 9. Control volume 10. Fuel return - low pressure 11. Control duct 12. Supply duct 13. Electrical connection 14. Fuel inlet connector - high pressure 15. Spring

SINGLE FUEL MANIFOLD PIPE

Specifcations

StructureThe single fuel manifold pipe (rail) is fitted on the inlet side cylinder head.

With its volume of around 33 cm[sup3 ] it dampens the fuel pressure oscillations due to:

  • the operation of the pressure pump
  • injector opening.
The fuel pressure sensor is fitted at the centre of the supply manifold  Characteristic of working principle 1060G  pressure pump electric control . The (high pressure) hydraulic connections between the manifold-pump and manifold-injectors are made by means of steel pipes with an internal diameter of 2 mm and an external diameter of 6 mm.