Read these past threads for the better understanding
4 stroke Engines - http://www.elakiri.com/forum/showthread.php?t=1626956
Fuel injection - http://www.elakiri.com/forum/showthread.php?t=1627122
This is one of a fuel injection system what I have talked about in ‘fuel injection’ thread
This is called Electronics Fuel Injection (EFI)
This is consist of these main components,
ECU (Electronic controlling unite)
MAP (manifold absolute pressure)
O_2 Sensor
BPW (base pulse width)
IDC (injector duty cycle)
IAC (idle air control)
CAN (controller area network)
TCU (transmission control unit)
![CENTER]](http://[CENTER][url]http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/07/ca/3a/large/0900c1528007ca3a.gif[/url][/CENTER])
Fuel injector is controlled by an ECU (Electronic controlling unite)
MAP (manifold absolute pressure) sensor measures the
amount of vacuum pressure inside of running engine and
then it tells ECU how much load is on the engine
(how hard the engine is working)
The information picking by the sensor is important because
the two pieces of data that ECU need to work properly with
rpm and load
Another valuable sensor in the EFI system is the oxygen
O_2 sensor
What the O_2 sensor does is measures the air/fuel mixture
in the exhaust system and corrects any errors
Base pulse width (BPW) is the amount of time that injector
is opened by the ECU in one engine cycle
Once the ECU is calculated everything, then BPW is the
end result how much fuel is actually put into the engine
If the ECU sees it means to increase fuel, it does so by
increasing pulse width and if it needs to decrease fuel,
it decreases the pulse width
There is a term related to BPW called IDC (injector duty cycle)
IDC is the ratio of BPW compared to the total time of an engine cycle
IDC measures and indicates how much of an injectors
capacity is being used in an engine
If an injector is at full capacity it's a sure sign that the
injector is too small
another important EFI term is IAC (idle air control)
IAC is an electronic valve that regulates the control vacuum leek
That controlled leek allows for great idle speed control and
can maintain consistent idle speed under different loads
It also can raise or lower idle speed we needed
Some EFI systems are equipped with a CAN (controller area network)
The Controller Area Network (CAN) acts as a gateway in that
it allows the devices to communicate a large amount of
information over a simple high-speed two wire network
Since it provides data from all sensors, it eliminates most of
the extra wiring necessary on vehicles not equipped with CAN
One of the primary components that users CAN is the TCU
(transmission control unit)
The TCU is similar to the ECU and that is a computer but the TCU
only varies with the transmission behavior
Things like vehicle speed, shift points, shift firmness, down shifting
and port converter lockup are some variables handled by the TCU
MAP (manifold absolute pressure) sensor measures the
amount of vacuum pressure inside of running engine and
then it tells ECU how much load is on the engine
(how hard the engine is working)
The information picking by the sensor is important because
the two pieces of data that ECU need to work properly with
rpm and load
Another valuable sensor in the EFI system is the oxygen
O_2 sensor
What the O_2 sensor does is measures the air/fuel mixture
in the exhaust system and corrects any errors
Base pulse width (BPW) is the amount of time that injector
is opened by the ECU in one engine cycle
Once the ECU is calculated everything, then BPW is the
end result how much fuel is actually put into the engine
If the ECU sees it means to increase fuel, it does so by
increasing pulse width and if it needs to decrease fuel,
it decreases the pulse width
There is a term related to BPW called IDC (injector duty cycle)
IDC is the ratio of BPW compared to the total time of an engine cycle
IDC measures and indicates how much of an injectors
capacity is being used in an engine
If an injector is at full capacity it's a sure sign that the
injector is too small
another important EFI term is IAC (idle air control)
IAC is an electronic valve that regulates the control vacuum leek
That controlled leek allows for great idle speed control and
can maintain consistent idle speed under different loads
It also can raise or lower idle speed we needed
Some EFI systems are equipped with a CAN (controller area network)
The Controller Area Network (CAN) acts as a gateway in that
it allows the devices to communicate a large amount of
information over a simple high-speed two wire network
Since it provides data from all sensors, it eliminates most of
the extra wiring necessary on vehicles not equipped with CAN
One of the primary components that users CAN is the TCU
(transmission control unit)
The TCU is similar to the ECU and that is a computer but the TCU
only varies with the transmission behavior
Things like vehicle speed, shift points, shift firmness, down shifting
and port converter lockup are some variables handled by the TCU
Hope this video better explain what EFI
Visit home for more on Automobile:http: //www.elakiri.com/forum/showthread.php?t=1626999
Please correct me, comment your suggestions and add more details
Thank you for your time.
I don't expect reputation or a bump please read and get something unless it will be wast of my time.
Last edited:
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