basics opperation of EFI equiped Motor Engines

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Department of Transpertation

Basic Operation

As explained in the Basic Theory section, the computer processes all of the voltage signals from the various sensors to determine the engine operating conditions at the moment and delivers the appropriate pulse width to the injectors. If engine airflow increases by 10%, the pulse width is also increased by about 10% to keep the air/fuel ratio constant. If the rpm is doubled from 2000 to 4000 rpm, the number of injections are also doubled to double the fuel flow.

The computer looks at the changes in sensor inputs every few milliseconds in order to be ready to modify the pulse width if any parameter changes.

For further information on EFI, you can consult the D manual located on this site.

Contributed By: SDSEFI

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