MULTI-PORT ELECTRONIC FUEL INJECTION (MPFI) TBI

Posted by: solidworkisb, 09 Dec, 2021

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Data Processing/Fuel Metering System

The actual processing of the information that occurs in the cells of the ECU is beyond the scope of this article. In simple terms, the ECU has a Series Of Data Cables programmed into its memory which list a value of all the sensors, the ECU will look in the cables and match the sensor values with the proper fuel value. This value should produce an AIR to FUEL RATIO OF APPROXIMATELY 14.7:1, CALLED STOICHEMETRIC.
Fuel is metered through fuel injectors by pulsing their internal valves to open and close at an extremely rapid pace measured in milliseconds (ms).
The ECU is constantly updating the fuel injector’s open to close time, known as the pulse width (PW) and the time between pulses, known as the PULSE INTERVAL (PI).
As the engine demand for fuel increases, the sensors relay that requirement to the ECU, which looks in the tables for the corresponding injector pulse width and pulse interval to meet the demand.
In general, the ECU will increase PW and decrease PI to RICHEN THE FUEL MIXTURE and as well decrease PW and increase PI to LEAN THE FUEL MIXTURE.
This way the ECU can infinitely adjust the fuel flow to match engine demand under any possible condition and at any point in time.

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