Tag Archives: Equivalence Ratio

How Torque varies with Air to Fuel Ratio

For my Stellaris Launchpad engine simulator, I wished to add a calculation of the Air to Fuel Ratio (AFR) or lambda/equivalence ratio for the current engine conditions. I did this crudely by using the throttle position, engine speed (this->s) and current fuel pulse width (this->F) as factors in calculating the AFR:

this->AFR = (0.32666 * this->s * this->throttle)/(this->F);

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