Various Schemes Injection System

Single Point Injection (Single Point Fuel Injection) 

Single point injection using a single injector in the throttle body (the same location as used by the carburetor). 

It was introduced in the 1940s in the aircraft engine (called the pressure carburetor) and in the 1980s in the automotive world (called Throttle-body injection by General Motors, Ford Fuel Injection Center, PGM-CARB by Honda, and EGI by Mazda) . After passing through the fuel intake (such as carburetor system) it is called "wet manifold injection system". 

For a single injection is not costly to repair. Various components such as carburetors which supports the air cleaner, intake manifold, and fuel line routing can be reused. It then redesigned with the cost of the equipment components. Single point injection has been widely used in passenger cars and trucks made ​​in America during 1980-1995, and some cars in Europe use a single point injection system in the early and mid-1990s. 

Continuous Injection (Continuous Fuel Injection) 

Continuous injection system, fuel flows through the injector at all times, but by the time tikat flow variables. This differs from most other fuel injection, which provides fuel at a short vibration of varying duration, with a constant air flow rate of each vibration. Continuous injection systems can Multi-Point Injection or single-point injection, but not directly. 

Automotive continuous injection system in which the most common is Injection System K-Jetronic Bosch, introduced in 1974, Bosch K-Jetronic used for years between 1974 and the mid 1990s by BMW, Lamborghini, Ferrari, Mercedes-Benz, Volkswagen , Ford, Porsche, Audi, Saab, DeLorean, and Volvo. Chrysler uses a fuel injection system continuously in the days of the empire from 1981 to 1983. 

Injection Gate Center (Central Port Fuel Injection) 

From the Year 1992-1996 General Motors implemented a system called Injection Gate Center (Central Port Injection). This system uses pipes with a small valve of the injector to spray fuel centers at each gate intake rather than to the center of the throttle-body. Pressure fuel injection system is similar to a single point.

Parts and functions in detail 

Note: The examples below apply to modern electronic injection gasoline engine. Fuels other than gasoline might be appropriate, but only in concept only. 

Components of an electronic injection 

Animated image of a cross section of a fuel injector. 

injector 

Fuel Pump / Fuel Pump 

Fuel Pressure Regulator 

Engine Control Module (ECM) including a digital computer and a string to communicate with sensors and control outputs. 

wiring Harness 

Various kinds of Sensors (Some of the important listed here.) 

Crank / Cam Position: Hall effect sensor 

Airflow: MAF sensor, and MAP sensor 

Exhaust Gas Oxygen: Oxygen sensor, EGO sensor, UEGO sensor

Description 

The main part of an electronic injection system (EFI) is the engine control unit (Engine Control Unit / ECU), which will monitor the activities of the engine through various sensors. These sensors will be used by the ECU to calculate the amount of fuel injected and the engine control by manipulating the amount of water and the incoming air. The amount of fuel injected depends on several factors such as engine temperature, engine rotation speed, and exhaust gas composition. 

Fuel injector is normally closed, and opens to inject fuel when there is electricity flowing in the solenoid coils.