Since 1994 of release
Repair and car operation
+ Running gear
+ Regular servicing
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
- Injection system
+ System of injection Motronic
- System of injection MPI and MPFI
Knots of system of injection
Adjustment by means of a ljambda-probe
Infringements in work and self-diagnostics
The visual control
Check of knots
Dismantle of separate details
Cable throttle заслонки
Check of the fulfilled gases
The help at malfunctions
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
Search of malfunctions
Knots of system of injection
That it is better to understand functioning of system of injection as a whole, in the beginning it is important to learn about problems of its separate knots.
1 — the Gauge of number of turns of the engine
This scheme illustrates the electric party of system of ignition/injection, in this case on example MPFI with the gauge of pressure of air in an inlet collector. On a left-hand side gauges and sensor controls which influence behaviour of the block of management take places. On the right those knots of ignition and injection to which the management block sends the signals are represented.
The fuel party of system of ignition/injection MPI/MPFI
At the left: injection valves (1, 2 and 3) in the six-cylinder engine are located by groups on three on the right and to the left of the central inlet collector.
The management block
Between the entering information (from various gauges) and injection valves there is an electronic block of management. Depending on existing conditions of loading and temperature it directs absolutely certain quantity of fuel to the engine. With that end in view the management block varies duration of opening of valves of injection operated an electromagnetic way. The quantity of injected fuel can change only at the expense of duration of injection. The information for definition of duration of injection arrives in the block of management from various knots, it:
In the channel всасывания each cylinder of the engine takes places on one valve of injection. It submits quantity of fuel necessary at present to each cylinder and simultaneously provides thin dispersion of gasoline.
Distributive tube of fuel
It serves for uniform giving of fuel to all valves of injection. Besides, the distributive tube functions as a collector and thanks to it does not suppose pressure fluctuations. The tube form is interesting кольцевидная, allowing to submit fuel to all to six valves.
Regulator of pressure of fuel
It settles down behind on the right on a distributive tube of fuel and should keep constant pressure of fuel in a distributive tube. It provides it by increase or reduction of quantity of the fuel flowing on рециркуляционной to a tube. If comes back more fuel, pressure goes down; at small return of fuel it rises.
The fuel pump and the relay
In more details you learn about the fuel pump with the electric drive, the relay of the fuel pump and other relays MPI/MPFI in the head the Fuel tank and the fuel pump.
Measuring instrument of pressure of fresh air
In a stream of soaked up air the wire which heats up an electric way is placed. Depending on weight of soaked up air the stream of air which cools a wire more strongly or more poorly changes. Temperature change causes change of resistance of a wire, and it is measured by the management block.
The gauge of pressure of air in an inlet collector
The gauge of pressure of air in an inlet collector is in the block of management MPFI. The inlet collector and the gauge incorporate among themselves a thin hose. For the block of management pressure of air in an inlet collector is the major information for loading calculation on the engine. It influences duration of injection and at the moment of ignition.
The gauge of temperature of a stream of fresh air
The gauge of temperature of soaked up air is screwed in in the channel всасывания the third cylinder (behind on the right). In addition to the gauge of pressure of air it serves the block of management for loading calculation on the engine. At a heat of soaked up air (it is equivalent low density of air) injection time, for example, should be reduced and the ignition moment hardly is more shifted in a direction "later".
Branch pipe throttle заслонки
There, where the stream of fresh air enters into an inlet collector of the engine, in the union there are two throttle заслонки. Smaller from them it is connected by a cable throttle заслонки to a pedal in salon. It doses out a stream of soaked up air in the engine before semigas position.
Potentiometer throttle заслонки
The potentiometer throttle заслонки is put in action by its shaft. The potentiometer defines position throttle заслонки at present and in the form of electric pressure sends a signal to the management block. This information on loading, besides other signals, is used by the block of management for adjustment of idling, a choice of the characteristic of ignition and calculation of duration of injection.
The valve of stabilisation of idling
As it is clear under the name, this valve provides constant number of turns of idling – not important, the engine is heated-up or not, capacity consumers (climatic installation) are connected or not.