|
|
 printable version
The electronic fuel injection (EFI) - General Information
Everything described in this guide vehicles equipped with electronic fuel injection (EFI). The injection is performed sequentially into the intake ports of each of the combustion chambers in order of ignition, and in an amount determined by the current needs of the engine. In each of the cylinders of the engine have one injector injection. The injectors are mounted in the intake manifold assembly, the upper section of which is a pressure chamber, providing optimum conditions for supplying air into the intake tract and its dosage detachable throttle cam (throttle body).
The main component (think tank) fuel injection system is a processor board, also called the module of management of functioning of the power unit (PCM). RSM examines continuously coming into the data from the various sensors and calculates information on the best currently composition of air-fuel mixture. The system also provides automatic compensation for changes in external factors such as the height of the vehicle above sea level, the load and engine speed.
Fuel supply in the canal system is provided by high-pressure submersible electric fuel pump. Pumping through the fuel filter, fuel system fuel pipe enters the fuel line system EFI.
In the assembly of the fuel line includes electric injectors performing metered injection of fuel directly into the intake ports of the engine combustion chamber. In addition to the injectors in the fuel line assembly also includes a fuel pressure regulator, fuel pressure is constantly maintained at a predetermined level. The excess fuel coming into the line for returnable gasoline pipe is given back to the tank.
The injectors are solenoid valves constant speed. The main components of the injector are a control solenoid, a plunger and a needle valve. All of the items are placed in a common housing. When electric current passes through the coil of the solenoid needle valve is slightly opened, fuel under pressure fills the cavity of the injector body and jetted through a nozzle into a combustion chamber of the corresponding cylinder. The amount of fuel injected is determined by the length of time for opening the valve, i.e., the duration of energization of the solenoid coil. In order to limit the current flowing through the injector, in the wiring circuit of the latter include resistors.
Duty cycle controls the injectors PCM. In memory module laid the basic values of the valve opening time for different combinations of input parameters (engine speed, and the amount of intake air temperature). The necessary information is supplied to the module in the form of signals from the respective sensors of the engine.
|
|
