الموضوع: ما هو عمل حساس map - iat

im not sure if i get you right but ,i think you have to convert MAF into MAP Mass air flow is what you are after for tuning anyway.
It's possible to convert MAP<->MAF with a lot of measurements and math. You'll need to know the engine displacement, a complete VE map, RPM itself and IAT. From that you can calculate MAP or backward MAF from MAP
The other way is to measure injector duty cycle, RPM and AFR. From that you can determine mass fuel flow and with that determine mass air flow from AFR.
If what you're after is to eliminate a MAF sensor, then you need somehow a mappable system between that's mapped with VE. There's no straight linear relationship where you just plug RPM, MAP, IAT and other variables into a formula to get a MAF output. You NEED a VE table.

It's really simple. The mass of fuel injected by the ECU per engine cycle depends on the mass of air ingested by the engine for a given AFR (AFR = mass of air / mass of fuel).
As any gas has a density (mass per volume), the mass of air ingested by the engine needs to be known. A MAF sensor measures that directly.
The air mass can also be calculated from the standard gas laws as the density is dependent on absolute gas pressure (MAP) and gas temperature (IAT). A 3 liter engine would theoretically ingest 1.5 liters of air per engine revolution. But in reality it's usually less because of intake restrictions, valve opening time, air-mass inertia and so on. The ratio of real air taken in versus engine displacement is the volumetric efficiency VE. At 80% VE the 3 liter engine would take in 1.44 liters instead of 1.5 liters at 100% VE.
A MAP based ECU calculates the ingested air mass per revolution from the engine displacement, VE-tables, MAP and IAT.
take alook at this pix it shows everything.

sorry i dont have arabic keyboard right now or u can give me the links

علي فكره عني في العربيه حساس iat و حساس map في حساس واحد علي المانفول

لا ...واضح من الرسم الهندسى اللى أنت رافعه....أنهما حساسين ولكن فى نفس العلبه ...ولكن كل حساس وليه دوره ونظرية تشغيله الخاصه بيه......لأن فيه أختلاف كبير فى تشغيلهم ومش ممكن يكونوا الأثنين بيطلعوا أشاره واحده لوحدة التحكم .....ولكن لكل حساس أشارته الخاصه بيه........................http://www.nilemotors.net/Nile/showthread.php?t=62631 أدى حساس حرارة الهواءhttp://www.nilemotors.net/Nile/showthread.php?t=62631