Injectors - Pulse Width to Volumetric Efficiency
Posted: Sun May 13, 2018 12:30 pm
I'm in the process of putting together a base map for a 2.0 Ford Duratec. I have suitable maps from other ECUs that contain PW figures for fuelling.
I obviously need to convert PW to VE (as a starting point at least) and that is my question - how?
The manual gives (for Alpha-N fuelling):
PW = INJ_CONST * VE(tps,rpm) * AirDensity * Corrections + AccEnrich + InjOpeningTime
where INJ_CONST is "a constant for the given size of injectors, engine’s displacement, pressure 100kPa, temperatures of the intake air 21°C, VE 100%, time of injectors’ opening required to obtain the stoichiometric mixture (Lambda = 1)"
It seems I need a value for INJ_CONST. I've searched here and have Googled, but am struggling to find anything definitive. My injectors are Bosch 0280 156 095 items which are 315 cc/min.
Any assistance would be much appreciated.
Adam
I obviously need to convert PW to VE (as a starting point at least) and that is my question - how?
The manual gives (for Alpha-N fuelling):
PW = INJ_CONST * VE(tps,rpm) * AirDensity * Corrections + AccEnrich + InjOpeningTime
where INJ_CONST is "a constant for the given size of injectors, engine’s displacement, pressure 100kPa, temperatures of the intake air 21°C, VE 100%, time of injectors’ opening required to obtain the stoichiometric mixture (Lambda = 1)"
It seems I need a value for INJ_CONST. I've searched here and have Googled, but am struggling to find anything definitive. My injectors are Bosch 0280 156 095 items which are 315 cc/min.
Any assistance would be much appreciated.
Adam