the engine for storing the coefficient data specifically associated with each fuel injector to provide fuel to that particular cylinder the coefficient data is used in the aforementioned third order equations stored in read only memory 64 thus depending upon the throttle setting and the corresponding rpm the equation in read only memory 64 is provided to microprocessor or calculator 68 of ecu 30 along with the appropriate coefficient data of the third order equation associated with the cylinder for which the volume of fuel is being determined microprocessor 68 then uses the equation and the corresponding coefficient data to calculate the necessary pulse width and provide the requisite amount of fuel to the appropriate fuel injection 52 62 to achieve efficient engine operation to aid in understanding the operation of these complex fuel injectors and the requirement of using advanced calculations to determine pulse width over those fuel injectors used in the past reference is made to the set of curves illustrative of fuel injector performance of earlier less complex fuel injectors as shown in fig2 an increase in pulse width results in an increase in fuel flow in a rather predictable manner as shown by the second order polynomial curves 70 72 74 and 76 representing four individual fuel injectors as used in a four cylinder engine it is clear from each of these curves that if the fuel flow associated with a particular pulse width is known.