since 1994 of release
Repair and car operation
+ Running gear
+ Regular servicing
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
- Injection system
+ System of injection of Motronic
- System of injection of MPI and MPFI
Knots of system of injection
Adjustment with the help a lambda probe
Violations in work and self-diagnostics
Check of knots
Dismantle of separate details
Butterfly valve cable
Check of exhaust gases
The help at malfunctions
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
Search of malfunctions
Knots of system of injection
In order 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 Sensor of number of turns of the engine
This scheme illustrates the electric party of system of ignition/injection, in this case on MPFI example with the sensor of pressure of air in an inlet collector. On the left side sensors and sensors which influence behavior of the control unit take place. On the right those knots of ignition and injection to which the control unit sends the signals are represented.
Fuel party of system of ignition/injection of MPI/MPFI
At the left: injection valves (1, 2 and 3) in the six-cylinder engine are located groups on three on the right and to the left of the central inlet collector.
Between entering information (from various sensors) and valves of injection there is an electronic control unit. Depending on existing conditions of loading and temperature it sends absolutely certain amount of fuel to the engine. For this purpose the control unit varies duration of opening of valves of injection operated by an electromagnetic way. The amount of injected fuel can change only at the expense of duration of injection. Information for determination of duration of injection arrives in the control unit from various knots, it:
In the channel of absorption of each cylinder of the engine takes place on one valve of injection. It submits amount of fuel necessary at present to each cylinder and at the same time provides thin dispersion of gasoline.
Distributive tube of fuel
It serves for uniform supply of fuel to all valves of injection. Besides, the distributive tube functions as a collector and thanks to it does not allow pressure fluctuations. The ring-shaped form of the tube, allowing to submit fuel to all six valves is interesting.
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 amount of the fuel flowing on a retsirkulyatsionny tube. If more fuel comes back, pressure goes down; at small return of fuel it rises.
Fuel pump and relay
In more detail you learn about the fuel pump with the electric drive, the relay of the fuel pump and other MPI/MPFI relays in 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 more strongly or more poorly cools a wire changes. Change of temperature causes change of resistance of a wire, and it is measured by the control unit.
The sensor of pressure of air in an inlet collector
The sensor of pressure of air in an inlet collector is in the MPFI control unit. The inlet collector and the sensor incorporate among themselves a thin hose. For the control unit pressure of air in an inlet collector is the major information for calculation of load of the engine. It influences duration of injection and at the moment of ignition.
Sensor of temperature of a stream of fresh air
The sensor of temperature of soaked-up air is screwed in to the canal of absorption of the third cylinder (behind on the right). In addition to the sensor of pressure of air it serves the control unit for calculation of load of the engine. At high temperature of soaked-up air (it is equivalent low density of air) injection time, for example, should be reduced and the moment of ignition is slightly more shifted in the direction "later".
Butterfly valve branch pipe
Where the stream of fresh air enters into an inlet collector of the engine, in the union there are two butterfly valves. Smaller from them it is connected by a butterfly valve cable to a pedal in salon. It doses out a stream of soaked-up air in the engine to the provision of semi-gas.
Butterfly valve potentiometer
The potentiometer of a butterfly valve is put in action by its shaft. The potentiometer defines the provision of a butterfly valve at present and in the form of electric tension sends a signal to the control unit. This information on loading, besides other signals, is used by the control unit for adjustment of idling, a choice of the characteristic of ignition and calculation of duration of injection.
Valve of stabilization of idling
As it is clear according to the name, this valve provides constant number of turns of idling – not important, the engine is heated-up or not, consumers of capacity (climatic installation) are connected or not.