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Which value does the controller use as a base for injection duration?

  • A.A pulse width from the map corrected for conditions
  • B.A fixed duration, which is the same for every operating condition and is corrected only by the fuel trims applied
  • C.The lambda voltage
  • D.A calculated mass of fuel, which is converted to a duration using the known flow rate of the injector fitted

Answer: A

The map gives a base value which corrections then modify for temperature, altitude and feedback. Modern systems genuinely calculate a fuel mass and convert it using the injector characteristic, which makes the last option a correct description of current practice. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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