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Input variables where Inj_out is dependant of with vapourised injection
Used sensor: Bosch 0 281 002 576
Free ADC inputs mcp3208:
- EC18pin12 available ADC because secondary_trigger: HALL
- EC18pin6 available ADC because onboard MAP
- EC18pin16
- EC36pin13 used for secondary trigger Hall
injection pulsewidth calculation
- For Fuelpressure: PW*MULTIPLIERpressure (look-up table) \ MembersPage/Fuel
- Fueltemperature PW*MULTIPLIERtemperature uses a look-up table (NTC) \ MembersPage/NTC
Density of a gas (eg. air) by universal gas law: proportional to 1/T (so multiply calculated fuel amount by Tref / T, both in degrees K: traditionally called "airdenfactor" that we make match matfactor - see EasyTherm)
For liquid injection, the liquid flowrate (through an injector) is proportional to sqrt(pressure) so we need to multiply fuel pw with (pressure ^ -0.5).
How to know pressure (over the injector!) is another question.
- Maybe it's regulated to a known value
- or maybe in some cases it's lower and directly or indirectly (eg. via tank temp and known curves) measured actual fuel pressure must be considered.
- PWlpg=PW*MULTIPLIERpressure*MULTIPLIERtemperature
Nice data sheets for gasses:
http://www.airliquide.com/en/business/products/gases/gasdata/index.asp?GasID=53
With this graph of pressure and temperature of Propane:
Same graph for butane-n:
