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Fuel Injection Question / Engine Design 200 1986

"...help me understand how the fuel injectors can all fire at the *same time*..."

The FI ecu controls the injectors. The ecu determines the pulse duration and number of pulses needed to deliver the proper amount of fuel for the engine's instantaneous needs.

"...provide the proper fuel amounts..."

The ecu receives inputs from the engine temperature and air flow rate through the AMM (air mass meter). This device measures how much air the engine is "inhaling." Based on that and other data, the ecu can calculate the required fuel. The injectors are "fired," or pulsed, to accomplish this.

"...with the proper timing..."

Timing's not important. The fuel sprays into the intake port above the valve, and does so several times for each power cycle. The fuel mist has an opportunity to vaporize before entering the cylinder. This is actually better (for economy and emissions) than to spray fuel mist into the combustion chamber. Keep in mind that gasoline mist does not burn -- it MUST be a vapor to burn, and the slight pause above the valve, into a hot port, helps vaporization.
--
Don Foster (near Cape Cod, MA)






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New Fuel Injection Question / Engine Design [200][1986]
posted by  someone claiming to be completely confused  on Sun Jul 7 08:07 CST 2002 >


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