E39 series BMW 5

since 1996-2001 of release

Repair and car operation

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Systems of cooling, heating
- Power supply system and release
   + Power supply system
   + System of injection of the petrol engine
   - Power supply system of the diesel engine
      System of a retsirkulyatsiya of the fulfilled gases (EGR system)
      Device of heating of the fuel filter
      Air removal from fuel system
      Check, removal and installation of the fuel locking valve
      Removal and installation of nozzles
      Check and adjustment of the moment of the beginning of injection
      Removal and installation of the inlet pipeline
   + System of production of the fulfilled gases
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Schemes
+ System of onboard diagnostics

Power supply system of the diesel engine

Principle of operation of the diesel engine

At operation of the diesel engine in its cylinders clean air which is compressed to a high pressure is soaked up. Thus air temperature rises approximately to + 600°С, exceeding temperature of ignition of diesel fuel. Fuel is injected into the cylinder with some advancing and ignites. Thus, spark plugs for ignition of fuel are not used.

At the cold engine the temperature of compression of air appears insufficient for fuel ignition. In this case the preliminary heating of the engine is required. For this purpose in each cylinder of the engine the electric glow plug is established. For improvement of start-up of the cold engine the beginning of supply of fuel is displaced towards earlier injection. After achievement by the engine of working temperature the beginning of injection is automatically displaced in the opposite direction. Management of the beginning of injection is carried out by the DDE block (DDE - system of digital diesel electronics) also, as well as management of amount of injected fuel and management of pressure of air of pressurization.

Fuel is sucked in by the toplivopodkachivayushchy pump and moves to the fuel pump of a high pressure (TNVD) of the engine. In TNVD fuel is compressed to pressure near the 160th bar and injected as it should be, similar to an ignition order in the petrol engine. The amount of injected fuel is defined by the DDE block according to impact on a gas pedal. The provision of a pedal of gas is defined by a potentiometer. Fuel injection in cylinders occurs through nozzles. Thanks to existence of the prechamber or the vortical chamber soaked-up air receives a certain movement that provides its good hashing with injected fuel.

Before intake of fuel it passes the fuel filter where separates from pollution and water in TNVD. It is necessary to clear and replace the filter periodically.

TNVD does not demand leaving. Mobile details of the pump are greased with diesel fuel. The drive of TNVD is carried out from a cranked shaft through a chain.

For a stop of the engine there is an electromagnetic valve for TNVD. When giving signal on the valve supply of fuel to TNVD stops and the engine stops.

The DDE block reveals available malfunctions in operation of the engine and registers them. By means of the special device the malfunctions found by the block can be считаны from memory and further are eliminated.