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Slide 10
Now, we add the electronic controls. They insure that the fuel injected at any given moment is precisely the amount the engine needs. As we will see, devices on the engine tell the control unit the actual load condition -- the engine speed -- and operating temperature, acceleration, full load or coasting condition. The Control box, operating as a kind of computer, calculates from this information the ideal amount of fuel needed -- and sends pulses of the proper length to the injectors. This control system operates independently of the ignition system.