BMW 3 series E46

Since 1998 of release

Repair and car operation

The BMW of 3 series Е46
+ Cars BMW 3 (Е46)
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
- Power supply systems, injection and release
   Security measures and rules of observance of cleanliness at work with fuel system
   Removal and installation of the gauge of a stock of fuel / the fuel pump
   Check of the gauge of a stock of fuel
   + The power supply system of petrol engines
   - System of injection of fuel of the petrol engine
      The general information and security measures at work
      Principle of work of system DME
      Removal and installation of injectors
      Check of system of injection of the petrol engine
      Check and adjustment of turns of idling and concentration WITH
   + The power supply system of diesel engines
   + System of release of the fulfilled gases
+ Engine electric equipment
+ Manual transmission and transmission a line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electric equipment schemes

Principle of work of system DME

The scheme of system of a digital control the engine (DME)

1 — an adsorber
2 — запорный the valve
3 — the valve of ventilation of a fuel tank
4 — a regulator of pressure of fuel
5 — an injector
6 — задатчик pressure
7 — the ignition coil
8 — the position gauge
9 — the pump of secondary air
10 — запорный the valve
11 — a measuring instrument of weight of air
12 — a monitor
13 — the gauge throttle заслонки

14 — задатчик idling
15 — the gauge of temperature of air
16 — the valve recycling the fulfilled gases
17 — the fuel filter
18 — the detonation gauge
19 — the gauge of number of turns
20 — the gauge of temperature of the engine
21 — the oxygen gauge
22 — a diagnostic socket
23 — a diagnostic lamp
24 — the differential gauge of pressure
25 — the fuel pump

Gauges of system of injection of petrol engines





Fuel is sucked in from a fuel tank by the electric gasoline pump located in a fuel tank, and moves through the fuel filter to injectors. The pressure regulator supports pressure of fuel in system to constants.

Injectors have electric management and inject fuel импульсно into the inlet pipeline in front of inlet valves of the engine.

Air is soaked up by the engine through the air filter and the inlet pipeline to inlet valves moves through knot throttle заслонки, and also.

The injected quantity of fuel is defined, first of all, by weight of soaked up air. The weight of soaked up air is defined by a measuring instrument located in the inlet pipeline. In the case of a measuring instrument of weight there is thin, электрически a warmed up plate which is cooled by a passing stream of air. The control system changes value of a current of heating so that the plate temperature remained a constant. If, for example, the quantity of soaked up air increases, the plate aspires to be cooled. Thereof value of a current of heating of a plate grows. On deviations of a current of heating the control system of the engine defines weight of air and accordingly regulates quantity of injected fuel.

The information arriving from various gauges, and the commands arriving to executive powers, provide optimum work of the engine in any mode. If gauges fail, the monitor is switched in emergency operation to exclude damages of the engine and to provide possibility of the further movement of the car. Failure of gauges not necessarily should be felt on deterioration of work of the engine. However not later than the nearest review period of the fulfilled gases the data about it will be brought in memory of malfunctions of a control system by the engine.

- Задатчик idling operates quantity of air idling bypassing throttle заслонки. It provides maintenance of constant number of turns idling irrespective of connection of additional consumers as, for example, the hydraulic booster of a wheel or the cooling compressor.

- Gauges of temperature of a cooling liquid and the gauge of temperature of soaked up air inform current value of temperature as a result of change of resistance of the resistor. At increase of temperature resistance decreases.

- The system of ventilation of a fuel tank consists of an adsorber and запорного the valve. In an adsorber the fuel steams formed as a result of heating of fuel accumulate. At work of the engine of pair отсысываются from an adsorber also move in chambers of combustion of the engine.

- Oxygen gauges measure the oxygen maintenance in the fulfilled gases before and after каталитического the converter and transmit corresponding signals in the engine management block.

- The relay of the fuel pump is in the relay block over a ware box. The relay submits a current to the fuel pump.

- The system of ignition has no the mobile parts, the traditional distributor of ignition is absent. Each spark plug has the coil.

- The monitoring system of pressure of ignition at too low voltage disconnects block DME (for example, owing to cable damage). Thus the engine cannot be started. It excludes damages каталитического the converter.

- The system of antidetonation regulation serves for definition and regulation of optimum time of ignition for each cylinder. If there is a malfunction in ignition system, fuel giving to corresponding cylinder stops.

- 320i, 323i, 328i: the System of regulation of phases timing (the moments of opening and closing of inlet and final valves), shortly named Doppel VANOS, turns both camshafts in relation to asterisks on a corner providing optimum phases timing on any power setting, and consequently optimum idling, high characteristics of a twisting moment and lowered the fuel expense. Turn is carried out under the pressure of oil. For this purpose system DME through the electrooperated valve regulates pressure of oil in operating element VANOS.

- The adjustable inlet pipeline depending on number of turns of the engine regulates length of the inlet pipeline. For this purpose in the inlet pipeline it is established rotary заслонка with pneumomanagement. The big length of the pipeline at low number of turns thanks to a resonance provides good filling of cylinders and by that higher twisting moment. At a great number of turns the length of a soaking up path decreases that raises potential of capacity of the engine.