Calcule temps d'injection

Bonjour, je suis actuellement sur le calcule du temps d'injection (ouverture de l'injecteur) et en appliquant cette formule au calculateur OEM (EDC17CP14) 2.0 TDI 110hp VAG je ne parviens pas a calculer mes temps d'injection même a une pression de carburant identique comme si les temps d'injections n'ont pas été calculés pareil.. (Exemple a 1800mbar de pression de rail j'ai 803,6us pour 78mg et 659,6us pour 60mg je voulais donc voir si le calcule correspond pour 70mg (valeur que j'ai déjà et qui est de 734,4us) hors lors du calcule je trouve : 739,6us et pareil sur d'autre axes..

Merci à tous pour votre aide et en espérant trouver des réponses à mes questions !

Capture d'écran ci-joint.

Bonne journée a tous :)

Hello, I'm currently calculating the injection timing (injector opening) and when applying this formula to the OEM ECU (EDC17CP14) for a 2.0 TDI 110hp VAG engine, I'm unable to calculate my injection times, even at the same fuel pressure. It's as if the injection times weren't calculated the same way. (For example, at 1800 mbar rail pressure, I get 803.6us for 78 mg and 659.6us for 60 mg. I wanted to see if the calculation would be correct for 70 mg (a value I already have, which is 734.4us), but when I calculate it, I get 739.6us, and the same thing happens on other axes.)

Screenshot attached.

Thank you all for your help, and I hope to find some answers to my questions!

Have a good day everyone :)

Rom,

I'm doing my best to make out the question you're driving toward. I think your frustration is that when attempting to calculate pulsewidth times using the method I've showed in the demo's your calculated values to not exactly match the map data. If this is not the case, please help clarify.

If that is the case, then the calcs you're showing fall squarely in the 'good enough' category as from what I can tell. 739.6 is only .7% off of the table value of 734.4. Remember, the factory uses the table because a mathematical expression cannot not 'perfectly' capture the data set. If it could, they would save the bytes used up defining this map. Having the injectors mapped is the best way to know pulsewidth times relative to mg, but it's also prohibitively expensive and time consuming for most enthusiasts.

Hope this helps,

Nick

Hello, I'm trying to find the perfect mathematical method to determine the number of injector sprays required for an increase in mg/str and an increase in rail pressure. and I'm trying to understand how the increase in this table works according to the manufacturer. Thank you!

We're on the same page. There's no 'perfect math' on the topic, that's why manufactures build tables using experimental data sets. The math you've used is as good as it gets.