Fuel Injection System!
Fuel system consists of fuel supply systems and fuel measuring system. Fuel supply system functioning drain fuel from the tank into the fuel measuring system. Furthermore, both the fuel measuring systems that use carburetors or fuel injection system functions as follows:
In this case the known parameter called Air-Fuel Ratio (AFR) which is the ratio of air to fuel weight. Comparison of the theoretical value for the combustion process is also called the perfect or stoichiometri AFR for gasoline engines of about 14.7.
Fuel system must be capable of producing air-fuel ratio required in the cylinder in accordance with engine operating conditions. For example at the time of cold start, it takes a rich fuel mixture. In cold conditions is still an automatic machine that vaporizes the fuel is only partially so that the extra fuel needed to get ready to burn the mixture in the cylinder.
Today has been a lot of vehicles using fuel injection systems instead of carburetors with the following considerations:
* Carburetor not able to channel the air-fuel mixture with the same price ratio for each cylinder.
* Vapor fuel which is heavier than air, will have difficulty when it flows through the twists and sharp angles of the suction funnel (intake manifold)
* With the injection system, fuel can dikabutkan directly into the suction line, close to the suction valve
* More precision in regulating the amount of fuel dikabutkan as a function of engine operating conditions detected by various sensors
There are two types of fuel injection systems for gasoline engines based injektornya position, namely:
1. Multipoint fuel-injection or port fuel injection (PFI), whereby the injector is located on the suction holes (intake port) on each cylinder.
2. Single-point fuel-injection or also called Throttle-body fuel injection (TBI), where the injector is installed before the suction channel is above the throttle valve.
Excess PFI compared with TBI is the distribution of air-fuel mixture is more uniform for each cylinder, the response to throttle position changes faster and more accurate in regulating the amount of fuel injected in accordance with operating conditions. Thus the better engine performance, reduced emissions and fuel consumption more efficient.
Conversely TBI only requires less injector and a simpler system. In this system, the distribution of the air-fuel mixture is strongly influenced by the suction channel design.
Also based on the method of distribution of fuel, also known as the system is as follows:
* Injection Continuous or Continuous Injection System (CIS), where fuel is injected continuously with a controlled mass flow rate.
* Injection is not continuous, where fuel is injected during certain time intervals when necessary.
In general, the fuel injection system controlled electronically or we know with Electronic Fuel Injection (EFI). The system is controlled by the Electronic Control Module (ECM) or also called Electronic Control Unit (ECU), namely in the form of chips and memory microprosessor placed "on board" in the car.
ECU receives input in the form of electronic signals from all sensors and process it to determine the amount of fuel needed to set the injector valve opening. The purpose of use and development of EFI until now is to improve the combustion performance and reduce exhaust gas emissions.
Fuel system consists of fuel supply systems and fuel measuring system. Fuel supply system functioning drain fuel from the tank into the fuel measuring system. Furthermore, both the fuel measuring systems that use carburetors or fuel injection system functions as follows:
- Gauge the amount of air and fuel in order to obtain the air-fuel mixture that can be burned quickly and completely in the cylinder
- Fuel atomization and dispersal in the air flow
- Determinants of changes in engine speed (acceleration and deceleration)
In this case the known parameter called Air-Fuel Ratio (AFR) which is the ratio of air to fuel weight. Comparison of the theoretical value for the combustion process is also called the perfect or stoichiometri AFR for gasoline engines of about 14.7.
Fuel system must be capable of producing air-fuel ratio required in the cylinder in accordance with engine operating conditions. For example at the time of cold start, it takes a rich fuel mixture. In cold conditions is still an automatic machine that vaporizes the fuel is only partially so that the extra fuel needed to get ready to burn the mixture in the cylinder.
Today has been a lot of vehicles using fuel injection systems instead of carburetors with the following considerations:
* Carburetor not able to channel the air-fuel mixture with the same price ratio for each cylinder.
* Vapor fuel which is heavier than air, will have difficulty when it flows through the twists and sharp angles of the suction funnel (intake manifold)
* With the injection system, fuel can dikabutkan directly into the suction line, close to the suction valve
* More precision in regulating the amount of fuel dikabutkan as a function of engine operating conditions detected by various sensors
There are two types of fuel injection systems for gasoline engines based injektornya position, namely:
1. Multipoint fuel-injection or port fuel injection (PFI), whereby the injector is located on the suction holes (intake port) on each cylinder.
2. Single-point fuel-injection or also called Throttle-body fuel injection (TBI), where the injector is installed before the suction channel is above the throttle valve.
Excess PFI compared with TBI is the distribution of air-fuel mixture is more uniform for each cylinder, the response to throttle position changes faster and more accurate in regulating the amount of fuel injected in accordance with operating conditions. Thus the better engine performance, reduced emissions and fuel consumption more efficient.
Conversely TBI only requires less injector and a simpler system. In this system, the distribution of the air-fuel mixture is strongly influenced by the suction channel design.
Also based on the method of distribution of fuel, also known as the system is as follows:
* Injection Continuous or Continuous Injection System (CIS), where fuel is injected continuously with a controlled mass flow rate.
* Injection is not continuous, where fuel is injected during certain time intervals when necessary.
In general, the fuel injection system controlled electronically or we know with Electronic Fuel Injection (EFI). The system is controlled by the Electronic Control Module (ECM) or also called Electronic Control Unit (ECU), namely in the form of chips and memory microprosessor placed "on board" in the car.
ECU receives input in the form of electronic signals from all sensors and process it to determine the amount of fuel needed to set the injector valve opening. The purpose of use and development of EFI until now is to improve the combustion performance and reduce exhaust gas emissions.
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