General information about fuel injection. BMW the 5th E28/E34 series (from 1981 to 1993 of release)
знаки крым
Repair of BMW E28 and series E34 from 1981 to 1993
1. Cars of the BMW brand of 5-series
2. Engine
3. Cooling system
4. Power supply system
4.1. General information
4.2. Pressure removal in system of injection of fuel
4.3. Check of pressure of fuel / fuel pump
4.4. Removal and installation of the fuel pump, intermediate pump and fuel level sensor
4.5. Repair and replacement of fuel lines and connectors
4.6. Removal and installation of a fuel tank
4.7. General information about cleaning and repair of a fuel tank
4.8. Removal and air purifier installation
4.9. Check, adjustment and replacement of a cable of an accelerator
4.10. General information about the carburetor
4.11. Removal and carburetor installation
4.12. Cleaning and carburetor adjustment
4.13. General information about fuel injection
4.14. Systems of injection of fuel
4.15. Check of functioning of system of injection of fuel
4.16. Functioning check, removal and installation of a measuring instrument of a stream of air
4.17. Functioning check, removal and installation of the case of a throttle
4.18. Check of functioning and replacement of a regulator of pressure of fuel
4.19. Check of functioning and replacement of an injector of cold start and temperature switch
4.20. Check of functioning and replacement of fuel injectors
4.21. Functioning check, adjustment and replacement of the air valve of stabilization of idling
4.22. Search of malfunctions of system of injection of fuel
4.23. Diagnostics of malfunctions of a power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
7. System of production of the fulfilled gases
8. Coupling
9. Manual box of gear shifting (RKPP) and automatic transmission (AT)
10. Transmission line
11. Steering and suspension bracket
12. Brake system
13. Body
14. Control body sizes
15. Heater and air conditioner
16. System of onboard electric equipment
17. Routine maintenance of the car
18. Size table and adjusting data
19. Schematic electric circuits
20. Governing bodies and operation receptions
21. System of onboard diagnostics - a principle of functioning and codes of malfunctions
 








4-13-obshhie-svedeniya-o-vpryske-topliva.html

4.13. General information about fuel injection

The system of injection of fuel consists of three main subsystems: fuel system, system of an admission of air and electronic control system.

Fuel system

The electric fuel pump located in or near a fuel tank, submits fuel under pressure to the fuel highway which distributes fuel evenly between all injectors. From the fuel highway fuel is injected into the input device of an injector located under the inlet valve. The amount of fuel injected by an injector, precisely is defined by the Electronic Control unit (ECU). At engine start-up the additional injector known as an injector of cold start-up (only on L-Jetronic systems and early systems Motronic), provides giving in the inlet pipeline of additional amount of fuel.

The pressure regulator according to razryazheniye size in the inlet pipeline operates pressure in system.

The fuel filter between the fuel pump and the fuel highway filters fuel to protect system components.

System of an admission of air

The system of an admission of air consists of the case of the air filter, a measuring instrument of a stream of air, the case of a throttle, the inlet pipeline and the related air lines. The measuring instrument of an air stream hands over information in ECU. These models are equipped with a measuring instrument of a stream of flyugerny type. Measurement of an inlet stream of air is made by a potentiometer, and the sensor of temperature takes temperature of inlet air. This information helps ECU to define amount of fuel injected by injectors (duration of injection). The butterfly valve in the case of a throttle copes the driver. When the butterfly valve opens, the amount of air passing through system increases, the signal of a potentiometer increases and ECU operates injectors on increase in amount of the fuel submitted to inlet devices.

Electronic control system

The processor control system operates fuel and other systems by means of the Electronic Control unit (ECU). ECU receives signals from a set of information sensors which trace such changing parameters, as volume of let-in air, temperature of let-in air, cooler temperature, engine turns, acceleration/delay and the content of oxygen in the fulfilled gases. These signals help ECU to define the duration of injection necessary for achievement of an optimum ratio air/fuel. These sensors and operated ECU corresponding to them actuation mechanisms are located on all impellent compartment. For the further data touching ECU and its interaction with electric systems of the engine and system of ignition address to Heads System of ignition and the Control system of the engine and decrease in toxicity of the fulfilled gases.

Are applied either L-Jetronic system, or Motronic. Late models are equipped with the modern version of initial system Motronic.


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4.12. Cleaning and carburetor adjustment
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4.14. Systems of injection of fuel